Java/Advanced Graphics/Curve
Содержание
- 1 Animated Graph
- 2 Draw Spline
- 3 Epsilon Delta
- 4 Families Of Graphs
- 5 Input the function and draw the curve
- 6 Integral Curves
- 7 Scatter Plot
- 8 Spline Editor
- 9 Shadow Properties
- 10 Shadow Quality
- 11 Generating a Shadow
- 12 Properties Changes
- 13 Threading Issues
- 14 Trace curve
- 15 Zoom interaction, Text background color, and the effect of transparency
Animated Graph
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
// An applet belonging to the class AnimatedGraph displays a graph // of a function that can depend on a parameter. The value of the // parameter can be "animated" so that it ranges from one value ot // another over a sequence of frames. import java.awt.*; import java.applet.Applet; import java.util.*; import edu.hws.jcm.draw.*; import edu.hws.jcm.data.*; import edu.hws.jcm.functions.*; import edu.hws.jcm.awt.*;
public class AnimatedGraph extends GenericGraphApplet {
// Declare some private variables that are created in one method in // this class and used in a second method. private Function func; // The function that is graphed. private Graph1D graph; // The graph of the function. private Animator animator; // Animates the graph private Variable kVar; // The parameter variable private VariableInput kMin, kMax, kIntervals; // min, max, and number of intervals for the animator. Might be null.
protected void setUpParser() { // Override this to create the animator and add its variable to the parser.
int options = Animator.START_STOP_BUTTON | Animator.PAUSE_BUTTON | Animator.LOOP_CHOICE;
if ( ! "no".equalsIgnoreCase(getParameter("UseNextAndPrev","yes")) )
options |= Animator.PREV_BUTTON | Animator.NEXT_BUTTON;
animator = new Animator(options);
kVar = animator.getValueAsVariable( getParameter("Parameter","k") );
parser.add(kVar);
super.setUpParser();
parameterDefaults = new Hashtable();
String defaultFunction = xVar.getName() + " / (" + kVar.getName() + " - " + xVar.getName() + "^2)";
parameterDefaults.put("Function",defaultFunction);
if (! "no".equalsIgnoreCase(getParameter("UseAnimatorInputs")))
parameterDefaults.put("TwoLimitsColumns","yes"); // change default if we need space for animator inputs
} // end setUpParser()
protected void setUpBottomPanel() { // Overridden to add the sliders at the bottom of the applet.
super.setUpBottomPanel(); // Do the default setup.
// If there is a functionInput box, then the SOUTH position of the mainPanel already contains
// the inputPanel that contains that box. If so, add the animator to the SOUTH position of
// the inputPanel. (This is a good place, in general, to put extra input objects.)
// If there is no inputPanel, then the SOUTH position of the mainPanel is empty, so put
// the animator there.
if (inputPanel != null)
inputPanel.add(animator, BorderLayout.SOUTH);
else
mainPanel.add(animator, BorderLayout.SOUTH);
} // end setUpBottomPanel()
protected void setUpCanvas() { // Overridden to add the graph to the canvas and do other chores.
super.setUpCanvas(); // Do the default setup.
// When setUpCanvas() is called, the functionInput already exists, if one is
// to be used, since it is created in setUpBopttomPanel(), which is called
// before setUpCanvas. If functionInput exists, add a graph of the function
// from functionInput to the canvas. If not, create a graph of the function
// specified by the parameter named "Function" (or use sin(k*x) if none is specified).
if (functionInput != null)
func = functionInput.getFunction(xVar);
else {
String def = getParameter("Function"); // default value is set in setUpParser()
func = new SimpleFunction( parser.parse(def), xVar );
}
// Create a graph of the function and add it to the canvas.
graph = new Graph1D(func);
graph.setColor(getColorParam("GraphColor", Color.magenta));
canvas.add(graph);
// Set up the min, max, and intervals property of the animator
if (! "no".equalsIgnoreCase(getParameter("UseAnimatorInputs"))) {
kMin = new VariableInput(kVar.getName() + "Start",getParameter("ParameterMin","-2"));
kMax = new VariableInput(kVar.getName() + "End",getParameter("ParameterMax","2"));
kIntervals = new VariableInput("Intervals", getParameter("Intervals","25"));
kIntervals.setInputStyle(VariableInput.INTEGER);
kIntervals.setMin(1);
kIntervals.setMax(1000);
kMin.setOnUserAction(mainController);
kMax.setOnUserAction(mainController);
kIntervals.setOnUserAction(mainController);
animator.setMin(kMin);
animator.setMax(kMax);
animator.setIntervals(kIntervals);
if (limitsPanel != null) {
// componets will be added to limitsPanel in setUpLimitsPanel()
mainController.add(kMin); // This is not done automatically, since they are in a limits panel
mainController.add(kMax);
mainController.add(kIntervals);
}
else {
JCMPanel ap = new JCMPanel(9,0);
ap.setBackground(getColorParam("PanelBackground", Color.lightGray));
ap.add(new Label(kMin.getName()));
ap.add(kMin);
ap.add(new Label());
ap.add(new Label(kMax.getName()));
ap.add(kMax);
ap.add(new Label());
ap.add(new Label(kIntervals.getName()));
ap.add(kIntervals);
ap.add(new Label());
mainPanel.add(ap,BorderLayout.EAST);
}
}
else {
try {
animator.setMin( (new Double(getParameter("ParameterMin","-2"))).doubleValue() );
animator.setMax( (new Double(getParameter("ParameterMax","2"))).doubleValue() );
animator.setIntervals( (int)Math.round((new Double(getParameter("Intervals","25"))).doubleValue()) );
}
catch (NumberFormatException e) {
}
}
animator.setOnChange(mainController);
// Add a DrawString to show the current value of the parameter
if ( ! "no".equalsIgnoreCase(getParameter("ShowParameter","yes")) ) {
DrawString param = new DrawString(kVar.getName() + " = #", DrawString.BOTTOM_LEFT, new Value[] { kVar });
param.setBackgroundColor(canvas.getBackground());
Color c = getColorParam("ParameterColor",Color.black);
param.setColor(c);
canvas.add(param);
}
} // end setUpCanvas
protected void setUpLimitsPanel() {
super.setUpLimitsPanel();
if (limitsPanel != null && kMin != null) { // add animator inputs to limits panel
limitsPanel.addComponentPair(kMin,kMax);
limitsPanel.addComponent(kIntervals);
}
}
protected void doLoadExample(String example) {
// This method is called when the user loads an example from the
// example menu (if there is one). It overrides an empty method
// in GenericGraphApplet.
// For the AnimatedGraph applet, the example string should contain
// an expression that defines the function to be graphed. This can optionally
// be followed by a semicolon and a list of four to nine numbers.
// The first four numbers give the x- and y-limits to be used for the
// example. If they are not present, then -5,5,-5,5 is used. The
// next three numbers specify the minimum value for the parameter, the
// maximum number, and the number of intervals in the animation.
// The eigth number, if present, specifies the starting loop style
// for the animation with the following code: 0 for once-through,
// 1 for loop, and 2 for back-and-forth. The ninth number, if
// present, tells whether to start the animation immediately upon
// loading. If it is 1, the animation is started. If it is
// not specified or is any value other than 1, the animation is not started.
animator.stop();
int pos = example.indexOf(";");
boolean startAnimation = false;
double[] limits = { -5,5,-5,5 }; // x- and y-limits to use
if (pos > 0) {
// Get limits from example text.
String nums = example.substring(pos+1);
example = example.substring(0,pos);
StringTokenizer toks = new StringTokenizer(nums, " ,");
if (toks.countTokens() >= 4) {
for (int i = 0; i < 4; i++) {
try {
Double d = new Double(toks.nextToken());
limits[i] = d.doubleValue();
}
catch (NumberFormatException e) {
}
}
}
if (toks.hasMoreTokens()) {
try {
double d = (new Double(toks.nextToken())).doubleValue();
if (kMin == null)
animator.setMin(d);
else
kMin.setVal(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
double d = (new Double(toks.nextToken())).doubleValue();
if (kMax == null)
animator.setMax(d);
else
kMax.setVal(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
int d = (int)Math.round((new Double(toks.nextToken())).doubleValue());
if (kIntervals == null)
animator.setIntervals(d);
else
kIntervals.setVal(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
int d = (int)Math.round((new Double(toks.nextToken())).doubleValue());
animator.setLoopStyle(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
int d = (int)Math.round((new Double(toks.nextToken())).doubleValue());
startAnimation = (d == 1);
}
catch (NumberFormatException e) {
}
}
}
// Set up the example data and recompute everything.
if (functionInput != null) {
// If there is a function input box, put the example text in it.
functionInput.setText(example);
}
else {
// If there is no user input, set the function in the graph directly.
try {
func = new SimpleFunction( parser.parse(example), xVar );
graph.setFunction(func);
}
catch (ParseError e) {
// There should"t be parse error"s in the Web-page
// author"s examples! If there are, the function
// just won"t change.
}
}
CoordinateRect coords = canvas.getCoordinateRect(0);
coords.setLimits(limits);
coords.setRestoreBuffer();
mainController.rupute();
if (startAnimation) {
try { // insert a small delay before animation starts
synchronized(this) {
wait(250);
}
}
catch (InterruptedException e) {
}
animator.start();
}
} // end doLoadExample()
public void stop() { // stop animator when applet is stopped
animator.stop();
super.stop();
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new AnimatedGraph();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class FamiliesOfGraphs
</source>
Draw Spline
<source lang="java">
import java.awt.*; import javax.swing.*; import no.geosoft.cc.geometry.Geometry; import no.geosoft.cc.geometry.Matrix4x4; import no.geosoft.cc.geometry.spline.SplineFactory; import no.geosoft.cc.graphics.*;
/**
* G demo program. Demonstrates: **
-
*
- A rudimentary sheet music library *
- GObject extension *
- Advanced geometry generation *
* * @author
Epsilon Delta
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
import java.awt.*; import java.applet.Applet; import java.util.StringTokenizer; import edu.hws.jcm.draw.*; import edu.hws.jcm.data.*; import edu.hws.jcm.functions.*; import edu.hws.jcm.awt.*; /**
* An applet for exploring the epsilon-delta definition of a limit. */
public class EpsilonDelta extends GenericGraphApplet {
// Declare some private variables that are created in one method in
// this class and used in a second method.
private VariableInput xInput;
private VariableInput epsilonInput;
private VariableInput deltaInput;
private VariableInput limitInput;
private VariableSlider xSlider;
private VariableSlider epsilonSlider;
private VariableSlider deltaSlider;
private VariableSlider limitSlider;
private Controller subController;
private Variable xValue, limitValue;
private Function func; // The function that is graphed.
private Graph1D graph; // The graph of the function.
protected void setUpBottomPanel() {
super.setUpBottomPanel();
subController = new Controller();
mainController.add(subController);
JCMPanel inputs = new JCMPanel(3);
subController.add(inputs);
inputs.setBackground(getColorParam("PanelBackground", Color.lightGray));
if (inputPanel == null)
mainPanel.add(inputs,BorderLayout.SOUTH);
else
inputPanel.add(inputs,BorderLayout.SOUTH);
JCMPanel left = new JCMPanel(0,1,2);
JCMPanel right = new JCMPanel(0,1,2);
JCMPanel middle = new JCMPanel(0,1,2);
inputs.add(middle, BorderLayout.CENTER);
inputs.add(left, BorderLayout.WEST);
inputs.add(right, BorderLayout.EAST);
double[] a = getNumericParam("AValue");
double avalue = (a == null || a.length < 1)? 0 : a[0];
if ("yes".equalsIgnoreCase(getParameter("UseAInput","yes"))) {
xSlider = new VariableSlider();
xInput = new VariableInput();
xInput.setVal(avalue);
xSlider.setVal(avalue);
xInput.setThrowErrors(false);
subController.add(new Tie(xSlider, xInput));
xValue = xInput.getVariable();
left.add(new Label("limit at a = ",Label.RIGHT));
middle.add(xSlider);
right.add(xInput);
}
else {
xValue = new Variable();
xValue.setVal(avalue);
}
a = getNumericParam("LimitValue");
double Lvalue = (a == null || a.length < 1)? 1 : a[0];
if ("yes".equalsIgnoreCase(getParameter("UseLimitInput","yes"))) {
limitSlider = new VariableSlider();
limitInput = new VariableInput();
limitInput.setVal(Lvalue);
limitSlider.setVal(Lvalue);
limitInput.setThrowErrors(false);
subController.add(new Tie(limitSlider, limitInput));
limitValue = limitInput.getVariable();
left.add(new Label(" test limit L = ",Label.RIGHT));
middle.add(limitSlider);
right.add(limitInput);
}
else {
limitValue = new Variable();
limitValue.setVal(Lvalue);
}
a = getNumericParam("EpsilonValue");
double epsilonValue = (a == null || a.length < 1)? 0.25 : a[0];
epsilonSlider = new VariableSlider(new Constant(0), new Constant(2));
epsilonInput = new VariableInput();
epsilonInput.setVal(epsilonValue);
epsilonSlider.setVal(epsilonValue);
epsilonInput.setThrowErrors(false);
subController.add(new Tie(epsilonSlider, epsilonInput));
left.add(new Label("epsilon = ", Label.RIGHT));
middle.add(epsilonSlider);
right.add(epsilonInput);
a = getNumericParam("DeltaValue");
double deltaValue = (a == null || a.length < 1)? 1 : a[0];
deltaSlider = new VariableSlider(new Constant(0), new Constant(2));
deltaInput = new VariableInput();
deltaInput.setVal(deltaValue);
deltaSlider.setVal(deltaValue);
deltaInput.setThrowErrors(false);
subController.add(new Tie(deltaSlider, deltaInput));
left.add(new Label("delta = ", Label.RIGHT));
middle.add(deltaSlider);
right.add(deltaInput);
}
protected void setUpCanvas() { // Override this to add more stuff to the canvas.
// When setUpCanvas is called, the functionInput already exists, if one is
// to be used, since it is created in setUpBopttomPanel(), which is called
// before setUpCanvas. If functionInput exists, add a graph of the function
// from functionInput to the canvas. If not, create a graph of the function
// specified by the parameter named "Function".
if (functionInput != null)
func = functionInput.getFunction(xVar);
else {
String def = getParameter("Function", "abs(" + xVar.getName() + ") ^ " + xVar.getName());
Function f = new SimpleFunction( parser.parse(def), xVar );
func = new WrapperFunction(f);
}
graph = new Graph1D(func);
graph.setColor(getColorParam("GraphColor", Color.black));
Value xMinusDelta = new ValueMath(xValue, deltaInput, "-");
Value xPlusDelta = new ValueMath(xValue, deltaInput, "+");
Value limitMinusEpsilon = new ValueMath(limitValue, epsilonInput, "-");
Value limitPlusEpsilon = new ValueMath(limitValue, epsilonInput, "+");
Value xmin = canvas.getCoordinateRect().getValueObject(CoordinateRect.XMIN);
Value xmax = canvas.getCoordinateRect().getValueObject(CoordinateRect.XMAX);
Value ymin = canvas.getCoordinateRect().getValueObject(CoordinateRect.YMIN);
Value ymax = canvas.getCoordinateRect().getValueObject(CoordinateRect.YMAX);
if (xSlider != null) {
xSlider.setMin(xmin);
xSlider.setMax(xmax);
}
if (limitSlider != null) {
limitSlider.setMin(ymin);
limitSlider.setMax(ymax);
}
DrawGeometric deltaBox = new DrawGeometric(DrawGeometric.RECT_ABSOLUTE, xMinusDelta, ymin, xPlusDelta, ymax);
deltaBox.setFillColor(new Color(225,255,225));
deltaBox.setLineWidth(0);
DrawGeometric epsilonBox = new DrawGeometric(DrawGeometric.RECT_ABSOLUTE, xmin, limitMinusEpsilon, xmax, limitPlusEpsilon);
epsilonBox.setFillColor(new Color(255,230,230));
epsilonBox.setLineWidth(0);
DrawGeometric overlap = new DrawGeometric(DrawGeometric.RECT_ABSOLUTE, xMinusDelta, limitMinusEpsilon, xPlusDelta,limitPlusEpsilon);
overlap.setFillColor(new Color(255,255,225));
overlap.setColor(Color.yellow);
DrawGeometric xLine = new DrawGeometric(DrawGeometric.LINE_ABSOLUTE, xValue, ymin, xValue, ymax);
xLine.setColor(new Color(130,255,130));
DrawGeometric limitLine = new DrawGeometric(DrawGeometric.LINE_ABSOLUTE, xmin, limitValue, xmax, limitValue);
limitLine.setColor(new Color(255,150,150));
canvas.add(deltaBox);
canvas.add(epsilonBox);
canvas.add(overlap);
canvas.add(xLine);
canvas.add(limitLine);
DrawString ds = new DrawString("a = #\nL = #\nf(a) = #", DrawString.TOP_LEFT,
new Value[] { xValue, limitValue, new ValueMath(func,xValue) });
ds.setBackgroundColor(Color.white);
ds.setFrameWidth(1);
subController.add(ds);
subController.add(deltaBox);
subController.add(epsilonBox);
subController.add(overlap);
subController.add(xLine);
subController.add(limitLine);
mainController.remove(canvas);
mainController.add(graph);
canvas.getCoordinateRect().setOnChange(mainController);
deltaSlider.setOnUserAction(subController);
epsilonSlider.setOnUserAction(subController);
deltaInput.setOnTextChange(subController);
epsilonInput.setOnTextChange(subController);
subController.add(deltaSlider);
subController.add(epsilonSlider);
subController.add(deltaInput);
subController.add(epsilonInput);
if (xInput != null) {
xSlider.setOnUserAction(subController);
xInput.setOnTextChange(subController);
subController.add(xSlider);
subController.add(xInput);
}
if (limitInput != null) {
limitSlider.setOnUserAction(subController);
limitInput.setOnTextChange(subController);
subController.add(limitSlider);
subController.add(limitInput);
}
super.setUpCanvas(); // Do the common setup: Add the axes, grid, etc
canvas.add(graph);
canvas.add(ds);
} // end setUpCanvas()
protected void doLoadExample(String example) {
// This method is called when the user loads an example from the
// example menu (if there is one). It overrides an empty method
// in GenericGraphApplet.
// After the function definition, there can be a semicolon and
// up to ten numbers (numbers can be separated by spaces and/or commas).
// The first four numbers specify the limits on the coordinate rect.
// .
int pos = example.indexOf(";");
double[] limits = { -5,5,-5,5 }; // x- and y-limits to use
if (pos > 0) { // get limits from example text
String limitsText = example.substring(pos+1);
example = example.substring(0,pos);
StringTokenizer toks = new StringTokenizer(limitsText, " ,");
double nums[] = new double[toks.countTokens()];
for (int i = 0; i < nums.length; i++) {
try {
nums[i] = (new Double(toks.nextToken())).doubleValue();
}
catch (Exception e) {
nums[i] = Double.NaN;
}
}
for (int i = 0; i < 4; i++)
if (nums.length >= i && !Double.isNaN(nums[i]))
limits[i] = nums[i];
if (nums.length > 4 && !Double.isNaN(nums[4]))
xValue.setVal( nums[4] );
else
xValue.setVal((limits[0]+limits[1])/2);
if (nums.length > 5 && !Double.isNaN(nums[5]))
limitValue.setVal( nums[5] );
else
limitValue.setVal((limits[0]+limits[1])/2);
if (nums.length > 8 && !Double.isNaN(nums[8]))
epsilonSlider.setMax( new Constant(nums[8]) );
else
epsilonSlider.setMax(new Constant(Math.abs(limits[2]-limits[3])/2));
if (nums.length > 9 && !Double.isNaN(nums[9]))
deltaSlider.setMax( new Constant(nums[9]) );
else
deltaSlider.setMax(new Constant(Math.abs(limits[0]-limits[1])/2));
if (nums.length > 6 && !Double.isNaN(nums[6])) {
epsilonInput.setVal( nums[6] );
epsilonSlider.setVal( nums[6] );
}
else {
epsilonInput.setVal(Math.abs(limits[2]-limits[3])/8);
epsilonSlider.setVal(Math.abs(limits[2]-limits[3])/8);
}
if (nums.length > 7 && !Double.isNaN(nums[7])) {
deltaInput.setVal( nums[7] );
deltaSlider.setVal( nums[7] );
}
else {
deltaInput.setVal(Math.abs(limits[0]-limits[1])/8);
deltaSlider.setVal(Math.abs(limits[0]-limits[1])/8);
}
}
// Set up the example data and recompute everything.
if (functionInput != null) {
// If there is a function input box, put the example text in it.
functionInput.setText(example);
}
else {
// If there is no user input, set the function in the graph directly.
// Also, in this case, func is a "WrapperFunction". Set the
// definition of that WrapperFunction to be the same as f
try {
Function f = new SimpleFunction( parser.parse(example), xVar );
((WrapperFunction)func).setFunction(f);
}
catch (ParseError e) {
// There should"t be parse error"s in the Web-page
// author"s examples! If there are, the function
// just won"t change.
}
}
CoordinateRect coords = canvas.getCoordinateRect(0);
coords.setLimits(limits);
coords.setRestoreBuffer();
mainController.rupute();
} // end doLoadExample()
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new EpsilonDelta();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class EpsilonDelta
</source>
Families Of Graphs
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
// An applet belonging to the class FamiliesOfGraphs displays a graph // of a function that can depend on one or more parameters. The values of // the parameters are controlled by the user using sliders at the bottom of // the applet.
import java.awt.*; import java.applet.Applet; import java.util.*; import edu.hws.jcm.draw.*; import edu.hws.jcm.data.*; import edu.hws.jcm.functions.*; import edu.hws.jcm.awt.*;
public class FamiliesOfGraphs extends GenericGraphApplet {
// Declare some private variables that are created in one method in
// this class and used in a second method.
private Function func; // The function that is graphed.
private Graph1D graph; // The graph of the function.
private Vector sliders; // Elements of this vector are the VariableSlider
// objects that represent the parameter values.
// The sliders are created in the setUpParser() method.
protected void setUpParser() { // Override this to add VariableSliders to parser.
// Get the data for the sliders from applet params named "Parameter", "Parameter1", ...
// The sliders are created and the variables are added to the parser by the
// addParameter() method, which is defined below.
sliders = new Vector();
int ct = 0;
String param = getParameter("Parameter");
if (param == null) {
ct++;
param = getParameter("Parameter" + ct);
}
while (true) {
if (param == null)
break;
addParameter(param);
ct++;
param = getParameter("Parameter" + ct);
}
// If no parameters were specified in applet params, create one with name "k".
if (sliders.size() == 0)
addParameter("k");
super.setUpParser(); // Call this last so function definitions
// in applet params can use the parameter names
// that have just been added to the parser
// (even though it"s probably not a good idea).
// Note that this also defines the independent variable,
// whose name is given by the applet param "Variable"
// and which is referred to as xVar in this program.
VariableSlider slide = (VariableSlider)sliders.elementAt(0);
String def = getParameter("Function", "sin(" + slide.getName() + " * " + xVar.getName() + ")");
parameterDefaults = new Hashtable(); // I want to set a different default value for
// the "Function" applet param.
parameterDefaults.put("Function",def);
} // end setUpParser()
private void addParameter(String data) {
// Create a VariableSlider from the information in name and add it to the
// Vector of sliders. The data must contain the name of the variable
// associated with the slider. The name can be followed by a ";" and up to
// three numbers. (If there is no ";", a space after the name will do.)
// The numbers can be separated by commas, spaces, or tabs. The first
// number gives the minimum value on the slider, the second gives the maximum,
// and the third gives the initial value of the slider variable.
double min = -5, max = 5, val = 0; // min, max, and value for slider
data = data.trim();
int pos = data.indexOf(";");
if (pos < 0)
pos = data.indexOf(" ");
String name; // The name of the parameter
if (pos < 0) {
// If there is no space or ";", the data is just the name of the variable.
name = data;
}
else {
// Get the name from the front of the data, then look for min, max, and val.
String nums = data.substring(pos+1);
name = data.substring(0,pos).trim();
StringTokenizer toks = new StringTokenizer(nums," ,\t");
try {
if (toks.hasMoreElements())
min = (new Double(toks.nextToken())).doubleValue();
if (toks.hasMoreElements())
max = (new Double(toks.nextToken())).doubleValue();
if (toks.hasMoreElements())
val = (new Double(toks.nextToken())).doubleValue();
}
catch (NumberFormatException e) {
min = -5;
max = 5;
val = 0;
}
}
// Create the slider, adding the associated variable to the parser, and set its value.
VariableSlider slide = new VariableSlider(name, new Constant(min), new Constant(max), parser);
slide.setVal(val);
sliders.addElement(slide); // Save the slider in the array of sliders for later use.
} // end setUpParser();
protected void setUpBottomPanel() { // Overridden to add the sliders at the bottom of the applet.
super.setUpBottomPanel(); // Do the default setup.
// Create a panel holding all the sliders, with a display label for each slider to show its value.
JCMPanel sliderPanel = new JCMPanel();
sliderPanel.setLayout(new GridLayout(0,1,3,3));
sliderPanel.setBackground(getColorParam("PanelBackground", Color.lightGray));
for (int i = 0; i < sliders.size(); i++) {
JCMPanel p = new JCMPanel();
VariableSlider slide = (VariableSlider)sliders.elementAt(i);
p.add(slide, BorderLayout.CENTER);
p.add(new DisplayLabel(" " + slide.getName() + " = # ", new Value[] { slide.getVariable() } ),
BorderLayout.EAST);
sliderPanel.add(p);
slide.setOnUserAction(mainController);
}
// If there is a functionInput box, then the SOUTH position of the mainPanel already contains
// the inputPanel that contains that box. If so, add the new panel to the SOUTH position of
// the inputPanel. (This is a good place, in general, to put extra input objects.)
// If there is no inputPanel, then the SOUTH position of the mainPanel is empty, so put
// the newly created panel there.
if (inputPanel != null)
inputPanel.add(sliderPanel, BorderLayout.SOUTH);
else
mainPanel.add(sliderPanel, BorderLayout.SOUTH);
} // end setUpBottomPanel()
protected void setUpCanvas() { // Overridden to add the graph to the canvas.
super.setUpCanvas(); // Do the default setup.
// When setUpCanvas() is called, the functionInput already exists, if one is
// to be used, since it is created in setUpBopttomPanel(), which is called
// before setUpCanvas. If functionInput exists, add a graph of the function
// from functionInput to the canvas. If not, create a graph of the function
// specified by the parameter named "Function" (or use sin(k*x) if none is specified).
if (functionInput != null)
func = functionInput.getFunction(xVar);
else {
String def = getParameter("Function"); // default value is set in setUpParser()
func = new SimpleFunction( parser.parse(def), xVar );
}
// Create a graph of the function and add it to the canvas.
graph = new Graph1D(func);
graph.setColor(getColorParam("GraphColor", Color.magenta));
canvas.add(graph);
} // end setUpCanvas
protected void doLoadExample(String example) {
// This method is called when the user loads an example from the
// example menu (if there is one). It overrides an empty method
// in GenericGraphApplet.
// For the FamiliesOfGraphs applet, the example string should contain
// an expression that defines the function to be graphed. This can optionally
// be followed by a semicolon and a list of four or more numbers.
// The first four numbers give the x- and y-limits to be used for the
// example. If they are not present, then -5,5,-5,5 is used. The
// remaining numbers occur in groups of three and specify the minimumn,
// maximum and values of the parameters, in the
// same order that they were encountered in the setUpParser() method.
int pos = example.indexOf(";");
double[] limits = { -5,5,-5,5 }; // x- and y-limits to use
if (pos > 0) {
// Get limits from example text.
String nums = example.substring(pos+1);
example = example.substring(0,pos);
StringTokenizer toks = new StringTokenizer(nums, " ,");
if (toks.countTokens() >= 4) {
for (int i = 0; i < 4; i++) {
try {
Double d = new Double(toks.nextToken());
limits[i] = d.doubleValue();
}
catch (NumberFormatException e) {
}
}
}
int i = 0;
while (i < sliders.size() && toks.hasMoreElements()) {
// Look for a value for the i-th slider.
try {
double min = (new Double(toks.nextToken())).doubleValue();
double max = (new Double(toks.nextToken())).doubleValue();
double d = (new Double(toks.nextToken())).doubleValue();
VariableSlider slider = ((VariableSlider)sliders.elementAt(i));
slider.setMin(new Constant(min));
slider.setMax(new Constant(max));
slider.setVal(d);
}
catch (Exception e) {
}
i++;
}
}
// Set up the example data and recompute everything.
if (functionInput != null) {
// If there is a function input box, put the example text in it.
functionInput.setText(example);
}
else {
// If there is no user input, set the function in the graph directly.
try {
func = new SimpleFunction( parser.parse(example), xVar );
graph.setFunction(func);
}
catch (ParseError e) {
// There should"t be parse error"s in the Web-page
// author"s examples! If there are, the function
// just won"t change.
}
}
CoordinateRect coords = canvas.getCoordinateRect(0);
coords.setLimits(limits);
coords.setRestoreBuffer();
mainController.rupute();
} // end doLoadExample()
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new FamiliesOfGraphs();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class FamiliesOfGraphs
</source>
Input the function and draw the curve
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
import java.awt.*; import edu.hws.jcm.data.*; import edu.hws.jcm.draw.*; import edu.hws.jcm.awt.*; public class GraphApplet1 extends java.applet.Applet {
public void init() {
Parser parser = new Parser(); // The Parser will take the user"s input
// and turn it into an Expression. By
// default, a Parser knows about the
// constants pi and e, the basic arithmetic
// operations + - * / ^ (where ^ is
// exponentiation), standard functions
// (sin, cos, tan, sec, csc, cot, sqrt,
// cubert, abs, ln, log2, log10, exp,
// trunc, round, floor, ceiling, arcsin,
// arccos, arctan). There is also a
// conditional "?" operator in the style
// of Java and C++.
Variable x = new Variable("x"); // For the parser to know about the variable x,
parser.add(x); // that variable must be created and added
// to the parser.
DisplayCanvas canvas = new DisplayCanvas();
// A DisplayCanvas is the fundamental JCM class for displaying
// graphical items such as axes and graphs.
canvas.setUseOffscreenCanvas(false); // By default, a DisplayCanvas uses
// "double buffering", which allows for
// smooth animation. However, it does
// use extra memory, so I turn it off
// in this simple applet. You might notice
// that the image flickers a bit when the
// applet is redrawn.
canvas.setHandleMouseZooms(true); // This tells the canvas to let the user
// zoom in and out by clicking, shift-clicking,
// and click-and-dragging on the canvas.
LimitControlPanel limits = new LimitControlPanel();
// A limit control panel can control the x- and y-limits on a DisplayCanvas.
// In the applet, the limit control panel is the gray area containing the
// input boxes for xmin, xmax, ymin, and ymax. It also contains a
// "Set Limits" button (and can contain other buttons if you want). The
// "Set Limits" button is a little redundant because pressing return
// in any of the input boxes will accomplish the same thing. However, it
// has the advantage of giving the user something obvious to do to
// set the limits.
limits.addCoords(canvas); // Tells the LimitControlPanel to control the
// x- and y-limits on this canvas. The limits
// on the canvas and the values in the input
// boxes are synchronized. (Try it by clicking
// on the graph.)
ExpressionInput input = new ExpressionInput("sin(x)+2*cos(3*x)", parser);
// An ExpressionInput is a text-input box where the user can enter
// an expression. The string "sin(x)+2*cos(3*x)" provides the initial
// contents for the box. The parser that is provided as the second
// arguments knows about the variable named "x", which makes it
// possible to use "x" in the expression.
Function func = input.getFunction(x); // To graph, I need a Function, not
// not an expression. input.getFunction(x)
// gets the contents of the ExpressionInput,
// input, considered as a function of the
// variable x.
Graph1D graph = new Graph1D(func); // This represents a graph of the function, func.
// It will be added to the DisplayCanvas,
// which will make it appear on the screen.
JCMPanel main = new JCMPanel(); // The interface for this applet is constructed
// entirely from JCMPanels. This makes much
// of the JCM setup automatic. This constructor
// makes a JCMPanel that uses a BorderLayout.
main.add(canvas, BorderLayout.CENTER); // Add the DisplayCanvas to the panel.
main.add(input, BorderLayout.SOUTH); // Add the ExprssionInput.
main.add(limits, BorderLayout.EAST); // Add the LimitControlPanel.
main.setInsetGap(3); // This leaves a gap of 3 pixels around the edges of the
// panel, where the gray background shows through.
setLayout(new BorderLayout()); // Set up the Applet itself.
add(main, BorderLayout.CENTER);
setBackground(Color.lightGray);
canvas.add( new Axes() ); // Add a set of Axes to the DisplayCanvas. The labels
// on the applet are automatically adjusted when
// the limits on the canvas changes.
canvas.add(graph); // Add the graph to the canvas. It will be redrawn
// whenever necessary.
Controller controller = main.getController();
// A Controller is what makes things happen in a JCM applet. The
// JCMPanel, main, has a controller that recomputes the JCM components
// in the Panel.
controller.setErrorReporter(canvas); // Errors in the user"s input need to
// be reported somehow. A Controller can
// have an ErrorReporter for this purpose.
// Currently, the alternatives are to use
// a canvas as an error reporter or to
// use a "MessagePopup". To see an error
// message in the applet, enter any expression
// with a syntax error and press return.
// Note that the blinking input cursor moves
// to the point in the expression where the
// error was discovered.
limits.setErrorReporter(canvas); // A LimitControlPanel also needs a place to
// report errors in the user"s input.
main.gatherInputs(); // The JCMPanel must be told to respond to user inputs.
// The gatherInputs() method is an easy way to do this,
// in many cases. In this applet, since there is only one
// input, this is equivalent to the single command
// "input.setOnUserAction(controller)," which tells the
// input object to notify the controller when the user
// presses return in the input box. (Note that input boxes
// in a LimitControlPanel are taken care of automatically.
// They don"t need to notify a controller. Also note that
// I couldn"t use the gatherInputs(controller) method in
// the previous ArithmeticApplet, since gatherInputs()
// calls the setOnUserAction() method of an input box, but in the
// ArithmeticApplet, I wanted to call setOnTextChange(). The
// difference is that with setOnUserAction(), the controller is
// notified only when the user presses return in the input box
// while with setOnTextChange(), the controller is notified
// each time the text in the input box changes.)
} // end init()
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
java.applet.Applet app = new GraphApplet1();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class SimpleGraph1
</source>
Integral Curves
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
// This applet displays a vector field (f1(x,y),f2(x,y)) and integral curves // for that vector field (although the integral curve feature can be turned off // with an applet param). The drawing of the curves is animated; they are // drawn segment-by-segment. In the default setup, a curve is started when the // user clicks on the canvas. A curve can also be started by entering the // starting x and y coords in a pair of text input boxes and clicking a button. import java.awt.*; import java.awt.event.*; import java.applet.Applet; import java.util.*; import edu.hws.jcm.draw.*; import edu.hws.jcm.data.*; import edu.hws.jcm.functions.*; import edu.hws.jcm.awt.*;
public class IntegralCurves extends GenericGraphApplet {
private Variable yVar; // The seond variable, usually y.
private Function xFunc,yFunc; // The functions that give the components of the vector field
private ExpressionInput functionInput2; // For inputting yFunc.
private VectorField field; // The vector/direction field
private Animator animator; // for incrementally drawing integral curves.
private Vector curves = new Vector(); // Holds the integral curves
private VariableInput deltaT; // input the deltaT for the curve
double dt = 0.1; // The value of delat t in the case where there is no deltaT input box
private VariableInput xStart,yStart; // Starting point for curve
private Choice methodChoice; // select integration method
private Button startCurveButton; // user clicks to start curve from (x,y) in xStart, yStart input boxes
private Button clearButton; // clears curves
private Color curveColor; // color for integral curves
private Draw curveDrawer = new Draw(); // A DrawTemp object that draws one segment of the integral curves.
private double[] nextPoint = new double[2]; // Help in computing next point of integral curve.
private double[] params = new double[2]; // ditto
private static final int RK4 = 0, RK2 = 1, EULER = 2; // constants for integration methos
private class Curve { // holds the data for one integral curve
double dt;
int method;
double x,y; // point on the curve
double lastX = Double.NaN, lastY; // previous point, so we can draw a line.
}
private class Draw implements DrawTemp { // For drawing the next segment in each integral curve (as a DrawTemp)
public void draw(Graphics g, CoordinateRect coords) {
int size = curves.size();
g.setColor(curveColor);
for (int i = 0; i < size; i++) {
Curve c = (Curve)(curves.elementAt(i));
if (! (Double.isNaN(c.x) || Double.isNaN(c.y) || Double.isNaN(c.lastX) || Double.isNaN(c.lastY)) ) {
int x1 = coords.xToPixel(c.lastX);
int y1 = coords.yToPixel(c.lastY);
int x2 = coords.xToPixel(c.x);
int y2 = coords.yToPixel(c.y);
g.drawLine(x1,y1,x2,y2);
}
}
}
}
protected void setUpParser() {
// create the "y" variable; also set up some parameter defaults.
yVar = new Variable(getParameter("Variable2","y"));
parser.add(yVar);
super.setUpParser(); // sets up xVar, among other things.
parameterDefaults = new Hashtable();
parameterDefaults.put("FunctionLabel", " f1(" + xVar.getName() + "," + yVar.getName() + ") = ");
parameterDefaults.put("FunctionLabel2", " f2(" + xVar.getName() + "," + yVar.getName() + ") = ");
parameterDefaults.put("Function", " " + yVar.getName() + " - 0.1*" + xVar.getName());
parameterDefaults.put("Function2", " - " + xVar.getName() + " - 0.1*" + yVar.getName());
defaultFrameSize = new int[] { 580, 440 };
}
protected void setUpCanvas() { // Override this to add more stuff to the canvas.
super.setUpCanvas(); // Do the common setup: Add the axes and
// set up the vector field and add it to the canvas
if (functionInput != null) {
xFunc = functionInput.getFunction(new Variable[] {xVar,yVar});
yFunc = functionInput2.getFunction(new Variable[] {xVar,yVar});
}
else {
String xFuncDef = getParameter("Function");
String yFuncDef = getParameter("Function2");
Function f = new SimpleFunction( parser.parse(xFuncDef), new Variable[] {xVar,yVar} );
xFunc = new WrapperFunction(f);
f = new SimpleFunction( parser.parse(yFuncDef), new Variable[] {xVar,yVar} );
yFunc = new WrapperFunction(f);
}
String type = (getParameter("VectorStyle", "") + "A").toUpperCase();
int style = 0;
switch (type.charAt(0)) {
case "A": style = VectorField.ARROWS; break;
case "L": style = VectorField.LINES; break;
case "S": style = VectorField.SCALED_VECTORS; break;
}
field = new VectorField(xFunc,yFunc,style);
Color color = getColorParam("VectorColor");
if (color != null)
field.setColor(color);
int space = (style == VectorField.LINES)? 20 : 30;
double[] d = getNumericParam("VectorSpacing");
if (d != null && d.length > 0 && d[0] >= 1)
space = (int)Math.round(d[0]);
field.setPixelSpacing(space);
canvas.add(field); // Finally, add the graph to the canvas.
curveColor = getColorParam("CurveColor", Color.magenta);
// add a mouse listener to the canvas for starting curves.
if ("yes".equalsIgnoreCase(getParameter("MouseStartsCurves","yes")) && "yes".equalsIgnoreCase(getParameter("DoCurves","yes")))
canvas.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent evt) {
CoordinateRect coords = canvas.getCoordinateRect();
double x = coords.pixelToX(evt.getX());
double y = coords.pixelToY(evt.getY());
if (xStart != null)
xStart.setVal(x);
if (yStart != null)
yStart.setVal(y);
startCurve(x,y);
}
});
} // end setUpCanvas()
protected void setUpBottomPanel() {
// Override this to make a panel containing controls. This is complicated
// because it"s possible to turn off a lot of the inputs with applet params.
// Check on the value of delta t, which has to be set even if there are no input controls.
double[] DT = getNumericParam("DeltaT");
if ( ! (DT == null || DT.length == 0 || DT[0] <= 0) )
dt = DT[0];
boolean doCurves = "yes".equalsIgnoreCase(getParameter("DoCurves","yes"));
boolean useInputs = "yes".equalsIgnoreCase(getParameter("UseFunctionInput","yes"));
if (!doCurves && !useInputs) // no input controls at all.
return;
// make the input panel
inputPanel = new JCMPanel();
inputPanel.setBackground( getColorParam("PanelBackground", Color.lightGray) );
mainPanel.add(inputPanel,BorderLayout.SOUTH);
// Make the function inputs and the compute button, if these are in the configuration.
JCMPanel in1 = null, in2 = null; // hold function inputs, if any
if (useInputs) {
if ( "yes".equalsIgnoreCase(getParameter("UseComputeButton", "yes")) ) {
String cname = getParameter("ComputeButtonName", "New Functions");
computeButton = new Button(cname);
computeButton.addActionListener(this);
}
functionInput = new ExpressionInput(getParameter("Function"),parser);
in1 = new JCMPanel();
in1.add(functionInput,BorderLayout.CENTER);
in1.add(new Label(getParameter("FunctionLabel")), BorderLayout.WEST);
functionInput.setOnUserAction(mainController);
functionInput2 = new ExpressionInput(getParameter("Function2"),parser);
in2 = new JCMPanel();
in2.add(functionInput2,BorderLayout.CENTER);
in2.add(new Label(getParameter("FunctionLabel2")), BorderLayout.WEST);
functionInput2.setOnUserAction(mainController);
}
// If we"re not doing curves, all we have to do is put the function inputs in the inputPanel
if (!doCurves) {
Panel p = new JCMPanel(2,1,3);
p.add(in1);
p.add(in2);
inputPanel.add(p, BorderLayout.CENTER);
if (computeButton != null)
inputPanel.add(computeButton,BorderLayout.EAST);
return;
}
// Now we know that doCurves is true. First, make the animator and clear button
animator = new Animator(Animator.STOP_BUTTON);
animator.setStopButtonName("Stop Curves");
animator.setOnChange(new Computable() { // animator drives curves
public void compute() {
extendCurves();
}
});
mainController.add(new InputObject() { // curves must stop if main controller is triggered
public void checkInput() {
curves.setSize(0);
animator.stop();
}
public void notifyControllerOnChange(Controller c) {
}
});
clearButton = new Button("Clear");
clearButton.addActionListener(this);
// Make a panel to contain the xStart and yStart inputs, if they are in the configuration.
Panel bottom = null;
if ("yes".equalsIgnoreCase(getParameter("UseStartInputs","yes"))) {
xStart = new VariableInput();
xStart.addActionListener(this);
yStart = new VariableInput();
yStart.addActionListener(this);
bottom = new Panel(); // not a JCMPanel -- I don"t want their contents checked automatically
startCurveButton = new Button("Start curve at:");
startCurveButton.addActionListener(this);
bottom.add(startCurveButton);
bottom.add(new Label(xVar.getName() + " ="));
bottom.add(xStart);
bottom.add(new Label(yVar.getName() + " ="));
bottom.add(yStart);
}
// Now, make a panel to contain the methodChoice and deltaT input if they are in the configuration.
// The animator and clear button will be added to this panel if it exists. If not, and if
// an xStart/yStart panel exists, then it will be added there. If neither exists,
// it goes in its own panel. The variable bottom ends up pointing to a panel that
// contains all the curve controls.
boolean useChoice = "yes".equalsIgnoreCase(getParameter("UseMethodChoice","yes"));
boolean useDelta = "yes".equalsIgnoreCase(getParameter("UseDeltaInput","yes"));
if (useChoice || useDelta) {
Panel top = new Panel(); // not a JCMPanel!
if (useDelta) {
top.add(new Label("dt ="));
deltaT = new VariableInput(null,""+dt);
top.add(deltaT);
}
if (useChoice) {
top.add(new Label("Method:"));
methodChoice = new Choice();
methodChoice.add("Runge-Kutta 4");
methodChoice.add("Runge-Kutta 2");
methodChoice.add("Euler");
top.add(methodChoice);
}
top.add(animator);
top.add(clearButton);
if (bottom == null)
bottom = top;
else {
Panel p = new Panel();
p.setLayout(new BorderLayout());
p.add(top, BorderLayout.NORTH);
p.add(bottom, BorderLayout.CENTER);
bottom = p;
}
}
else {
if (bottom == null)
bottom = new Panel();
bottom.add(animator);
bottom.add(clearButton);
}
// Add the panels "bottom" to the inputPanel, and ruturn
// if there are no function inputs.
inputPanel.add(bottom, BorderLayout.CENTER);
if (in1 == null)
return;
// Add the function inputs and compute button to the inputPanel
Panel in = new JCMPanel(1,2);
in.add(in1);
in.add(in2);
if (computeButton != null) {
Panel p = new JCMPanel();
p.add(in,BorderLayout.CENTER);
p.add(computeButton,BorderLayout.EAST);
in = p;
}
inputPanel.add(in,BorderLayout.NORTH);
} // end setUpBottomPanel()
public void actionPerformed(ActionEvent evt) {
// React if user presses return in xStart or yStart, or pass evt on to GenericGraphApplet
Object src = evt.getSource();
if (src == clearButton) {
canvas.clearErrorMessage();
curves.setSize(0);
animator.stop();
canvas.rupute(); // force recompute of off-screen canvas!
}
else if (src == xStart || src == yStart || src == startCurveButton) {
// Start a curve from x and y values in xStart and yStart
canvas.clearErrorMessage();
double x=0, y=0;
try {
xStart.checkInput();
x = xStart.getVal();
yStart.checkInput();
y = yStart.getVal();
startCurve(x,y);
if (deltaT != null) {
deltaT.checkInput();
dt = deltaT.getVal();
if (dt <= 0) {
deltaT.requestFocus();
throw new JCMError("dt must be positive", deltaT);
}
}
}
catch (JCMError e) {
curves.setSize(0);
animator.stop();
canvas.setErrorMessage(null,"Illegal Data For Curve. " + e.getMessage());
}
}
else
super.actionPerformed(evt);
} // end actionPerfromed
public void startCurve(double x, double y) {
// Start an integral curve at the point (x,y)
synchronized (curves) {
if (deltaT != null) {
try {
deltaT.checkInput();
dt = deltaT.getVal();
if (dt <= 0) {
deltaT.requestFocus();
throw new JCMError("dt must be positive", deltaT);
}
}
catch (JCMError e) {
curves.setSize(0);
animator.stop();
canvas.setErrorMessage(null,"Illegal Data For Curve. " + e.getMessage());
return;
}
}
Curve c = new Curve();
c.dt = dt;
int method = (methodChoice == null)? RK4 : methodChoice.getSelectedIndex();
c.method = method;
c.x = x;
c.y = y;
curves.addElement(c);
animator.start();
}
}
public void extendCurves() {
// Add the next segment to each integral curve. This function
// is called repeatedly by the animator.
synchronized(curves) {
if (canvas == null || canvas.getCoordinateRect() == null) // can happen when frame closes
return;
while (canvas.getCoordinateRect().getWidth() <= 0) {
// need this at startup to make sure that the canvas has appeared on the screen
try {
Thread.sleep(200);
}
catch (InterruptedException e) {
}
}
int size = curves.size();
for (int i = 0; i < size; i++) {
Curve curve = (Curve)curves.elementAt(i);
curve.lastX = curve.x;
curve.lastY = curve.y;
nextPoint(curve.x, curve.y, curve.dt, curve.method);
curve.x = nextPoint[0];
curve.y = nextPoint[1];
}
CoordinateRect c = canvas.getCoordinateRect();
double pixelWidthLimit = 100000*c.getPixelWidth();
double pixelHeightLimit = 100000*c.getPixelHeight();
for (int i = size-1; i >= 0; i--) {
Curve curve = (Curve)curves.elementAt(i);
if (Double.isNaN(curve.x) || Double.isNaN(curve.y) ||
Math.abs(curve.x) > pixelWidthLimit ||
Math.abs(curve.y) > pixelWidthLimit) // stop processing this curve
curves.removeElementAt(i);
}
if (curves.size() > 0)
canvas.drawTemp(curveDrawer);
else {
animator.stop();
}
}
}
private void nextPoint(double x, double y, double dt, int method) {
// Find next point from (x,y) by applying specified method over time interval dt
switch (method) {
case EULER:
nextEuler(x,y,dt);
break;
case RK2:
nextRK2(x,y,dt);
break;
case RK4:
nextRK4(x,y,dt);
break;
}
}
private void nextEuler(double x, double y, double dt) {
params[0] = x;
params[1] = y;
double dx = xFunc.getVal(params);
double dy = yFunc.getVal(params);
nextPoint[0] = x + dt*dx;
nextPoint[1] = y + dt*dy;
}
private void nextRK2(double x, double y, double dt) {
params[0] = x;
params[1] = y;
double dx1 = xFunc.getVal(params);
double dy1 = yFunc.getVal(params);
double x2 = x + dt*dx1;
double y2 = y + dt*dy1;
params[0] = x2;
params[1] = y2;
double dx2 = xFunc.getVal(params);
double dy2 = yFunc.getVal(params);
nextPoint[0] = x + 0.5*dt*(dx1+dx2);
nextPoint[1] = y + 0.5*dt*(dy1+dy2);
}
private void nextRK4(double x, double y, double dt) {
params[0] = x;
params[1] = y;
double dx1 = xFunc.getVal(params);
double dy1 = yFunc.getVal(params);
double x2 = x + 0.5*dt*dx1;
double y2 = y + 0.5*dt*dy1;
params[0] = x2;
params[1] = y2;
double dx2 = xFunc.getVal(params);
double dy2 = yFunc.getVal(params);
double x3 = x + 0.5*dt*dx2;
double y3 = y + 0.5*dt*dy2;
params[0] = x3;
params[1] = y3;
double dx3 = xFunc.getVal(params);
double dy3 = yFunc.getVal(params);
double x4 = x + dt*dx3;
double y4 = y + dt*dy3;
params[0] = x4;
params[1] = y4;
double dx4 = xFunc.getVal(params);
double dy4 = yFunc.getVal(params);
nextPoint[0] = x + (dt / 6) * (dx1 + 2 * dx2 + 2 * dx3 + dx4);
nextPoint[1] = y + (dt / 6) * (dy1 + 2 * dy2 + 2 * dy3 + dy4);
}
protected void doLoadExample(String example) {
// This method is called when the user loads an example from the
// example menu (if there is one). It overrides an empty method
// in GenericGraphApplet.
// For the IntegrapCurves applet, the example string should contain
// two expression that defines the vector field, separated
// by a semicolon. This can optionally
// be followed by another semicolon and a list of numbers, separated by spaces and/or commas.
// The first four numbers give the x- and y-limits to be used for the
// example. If they are not present, then -5,5,-5,5 is used. The next number, if present,
// specifies a value for delta t. If there are more numbers, they should come in pairs.
// each pair specifies a point where a curve will be started when the
// example is loaded. There is a 0.5 second delay between loading and starting the
// curves to allow time for the redrawing (although it seems to block the redrawing, at least
// on some platforms).
if (animator != null) {
curves.setSize(0);
animator.stop();
}
int pos = example.indexOf(";");
if (pos == -1)
return; // illegal example -- must have two functions
String example2 = example.substring(pos+1);
example = example.substring(0,pos);
pos = example2.indexOf(";");
double[] limits = { -5,5,-5,5 }; // x- and y-limits to use
StringTokenizer toks = null;
if (pos > 0) {
// Get limits from example2 text.
String nums = example2.substring(pos+1);
example2 = example2.substring(0,pos);
toks = new StringTokenizer(nums, " ,");
if (toks.countTokens() >= 4) {
for (int i = 0; i < 4; i++) {
try {
Double d = new Double(toks.nextToken());
limits[i] = d.doubleValue();
}
catch (NumberFormatException e) {
}
}
}
if (toks.hasMoreTokens()) {
double d = Double.NaN;
try {
d = (new Double(toks.nextToken())).doubleValue();
}
catch (NumberFormatException e) {
}
if (Double.isNaN(d) || d <= 0 || d > 100)
d = 0.1;
if (deltaT != null)
deltaT.setVal(d);
else
dt = d;
}
}
// Set up the example data and recompute everything.
if (functionInput != null) {
// If there is a function input box, put the example text in it.
functionInput.setText(example);
functionInput2.setText(example2);
}
else {
// If there is no user input, set the function in the graph directly.
try {
Function f = new SimpleFunction( parser.parse(example), xVar );
((WrapperFunction)xFunc).setFunction(f);
Function g = new SimpleFunction( parser.parse(example2), xVar );
((WrapperFunction)yFunc).setFunction(g);
}
catch (ParseError e) {
// There should"t be parse error"s in the Web-page
// author"s examples! If there are, the function
// just won"t change.
}
}
CoordinateRect coords = canvas.getCoordinateRect(0);
coords.setLimits(limits);
coords.setRestoreBuffer();
mainController.rupute();
if (animator != null && toks != null) { // get any extra nums from the tokenizer and use them as starting points for curves
int ct = 2*(toks.countTokens()/2);
if (ct > 0) {
synchronized(curves) {
for (int i = 0; i < ct; i++) {
try {
double x = (new Double(toks.nextToken())).doubleValue();
double y = (new Double(toks.nextToken())).doubleValue();
startCurve(x,y);
}
catch (Exception e) {
}
}
if (curves.size() > 0) { // start the curves going
try {
Thread.sleep(500); // wait a bit to give the canvas time to start drawing itself.
}
catch (InterruptedException e) {
}
}
}
}
}
} // end doLoadExample()
public void stop() { // stop animator when applet is stopped
if (animator != null) {
curves.setSize(0);
animator.stop();
}
super.stop();
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new IntegralCurves();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class IntegralCurves
</source>
Scatter Plot
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
import edu.hws.jcm.awt.*; import edu.hws.jcm.data.*; import edu.hws.jcm.draw.*; import java.awt.*; import java.awt.event.*; import java.io.*; import java.net.*; import java.util.*; import java.applet.Applet; /**
* A ScatterPlotApplet shows a scatter plot of data from a DataTableInput. * The user can enter the data in a two-column table that is shown in * the applet. It is also possible to configure the applet with a menu * of file names. These files, which must be in the same directory as * the Web page on which the applet appears, will appear in a menu. * A file can contain data for the table, with two numbers per line. * When the user loads the file, the data replaces the data in the table. */
public class ScatterPlotApplet extends Applet implements ActionListener {
private Frame frame; // If non-null, a separate window.
private String frameTitle; // Title for the separate window.
private Button launchButton; // If non-null, then clicking this buttons opens a separate window.
private String launchButtonName; // Name for the launch button.
private DataTableInput table; // The table for input of data.
private ScatterPlot scatterPlot; // The scatter plot of the data.
private DisplayCanvas canvas; // The DisplayCanvas on which the plot is drawn.
private Button loadFileButton; // When clicked, a data file is loaded.
private Choice fileMenu; // Pop-up menu containing names of functions.
private String[] fileNames; // Names of data files associated with menu entries.
private Controller mainController; // Controller from the main JCMPanel.
/**
* The init() method is called by the system to set up the applet.
* If the applet does not appear as a button, then init() creates the main panel of the applet
* and calls setUpMainPanel to set it up.
*/
public void init() {
frameTitle = getParameter("FrameTitle"); // Get title to be used for separate window, if any.
if (frameTitle == null) {
frameTitle = "Scatter Plots";
int pos = frameTitle.lastIndexOf(".");
if (pos > -1)
frameTitle = frameTitle.substring(pos+1);
}
setLayout(new BorderLayout());
int height = getSize().height;
launchButtonName = getParameter("LaunchButtonName");
if ( (height > 0 && height <= 50) || launchButtonName != null) {
// Use a separater window and only show a button in the applet.
if (launchButtonName == null)
launchButtonName = "Launch " + frameTitle;
launchButton = new Button(launchButtonName);
add(launchButton, BorderLayout.CENTER);
launchButton.addActionListener(this);
}
else {
// Show the main panel in the applet, not in a separate window.
add(makeMainPanel(), BorderLayout.CENTER);
}
}
/*
* Create the main panel of the applet.
*/
public Panel makeMainPanel() {
// Make the main panel
JCMPanel panel = new JCMPanel(2);
mainController = panel.getController();
panel.setBackground(new Color(0,0,180));
panel.setInsetGap(2);
setLayout(new BorderLayout());
// Make a DataInputTable with two columns
table = new DataTableInput(null, 2);
table.setColumnName(0, getParameter("ColumnName1", "X"));
table.setColumnName(1, getParameter("ColumnName2", "Y"));
table.setThrowErrors(true);
if ( "yes".equalsIgnoreCase(getParameter("ShowColumnTitles","yes")))
table.setShowColumnTitles(true);
if ( "yes".equalsIgnoreCase(getParameter("ShowRowNumbers","yes")))
table.setShowRowNumbers(true);
// Make input boxes for getting expressions that can include
// the variables associated with the table. Initially, the
// expressions are just the column names.
Parser parser = new Parser();
table.addVariablesToParser(parser);
ExpressionInput input1 = new ExpressionInput(table.getColumnName(0),parser);
input1.setOnUserAction(mainController);
ExpressionInput input2 = new ExpressionInput(table.getColumnName(1),parser);
input2.setOnUserAction(mainController);
// Make a scatter plot that graphs the first expressiong vs. the second expression.
scatterPlot = new ScatterPlot(table, input1.getExpression(), input2.getExpression());
if ( ! "yes".equalsIgnoreCase(getParameter("ShowRegressionLine","yes")))
scatterPlot.setShowRegressionLine(false);
if ( ! "yes".equalsIgnoreCase(getParameter("MissingValueIsError","yes")))
scatterPlot.setMissingValueIsError(false);
// Create the display canvas where the scater plot will be shown.
canvas = new DisplayCanvas();
canvas.add(new Axes());
canvas.add(scatterPlot);
mainController.setErrorReporter(canvas);
// A compute button to recompute everything.
ComputeButton computeButton = new ComputeButton("Update Display");
computeButton.setOnUserAction(mainController);
computeButton.setBackground(Color.lightGray);
// A menu of files that can be loaded. If no filenames are provided as
// applet parameters, then menu is null.
Panel menu = makefileMenu();
// Lay out the components in the applet.
JCMPanel inputPanel = null;
Panel bottom = null; //might not be a JCMPanel
if ( "yes".equalsIgnoreCase(getParameter("UseExpressionInputs","yes"))) {
inputPanel = new JCMPanel(1,2);
inputPanel.setBackground(Color.lightGray);
JCMPanel leftInput = new JCMPanel();
leftInput.add(new Label(" Plot: "), BorderLayout.WEST);
leftInput.add(input1, BorderLayout.CENTER);
inputPanel.add(leftInput);
JCMPanel rightInput = new JCMPanel();
rightInput.add(new Label(" versus: "), BorderLayout.WEST);
rightInput.add(input2, BorderLayout.CENTER);
inputPanel.add(rightInput);
bottom = new JCMPanel(new BorderLayout(12,3));
bottom.add(inputPanel, BorderLayout.CENTER);
bottom.add(computeButton, BorderLayout.EAST);
}
if ( scatterPlot.getShowRegressionLine() && "yes".equalsIgnoreCase(getParameter("ShowStats","yes")) ) {
// Make a display label to show some statistics about the data.
DisplayLabel dl = new DisplayLabel(
"Slope = #; Intercept = #; Correlation = #",
new Value[] { scatterPlot.getValueObject(ScatterPlot.SLOPE),
scatterPlot.getValueObject(ScatterPlot.INTERCEPT),
scatterPlot.getValueObject(ScatterPlot.CORRELATION) }
);
dl.setAlignment(Label.CENTER);
dl.setBackground(Color.lightGray);
dl.setForeground(new Color(200,0,0));
dl.setFont(new Font("Serif",Font.PLAIN,14));
if (bottom != null)
bottom.add(dl, BorderLayout.SOUTH);
else {
bottom = new JCMPanel(new BorderLayout(12,3));
bottom.add(dl, BorderLayout.CENTER);
bottom.add(computeButton, BorderLayout.EAST);
}
}
if (bottom == null) {
if (menu != null)
menu.add(computeButton, BorderLayout.EAST);
else {
bottom = new Panel();
bottom.add(computeButton);
}
}
panel.add(canvas, BorderLayout.CENTER);
panel.add(table, BorderLayout.WEST);
if (bottom != null)
panel.add(bottom, BorderLayout.SOUTH);
if (menu != null)
panel.add(menu, BorderLayout.NORTH);
else {
String title = getParameter("PanelTitle");
if (title != null) {
Label pt = new Label(title, Label.CENTER);
pt.setBackground(Color.lightGray);
pt.setForeground(new Color(200,0,0));
pt.setFont(new Font("Serif",Font.PLAIN,14));
panel.add(pt, BorderLayout.NORTH);
}
}
return panel;
} // end makeMainPanel()
private Panel makefileMenu() {
// If the applet tag contains params named "File", "File1", "File2", ..., use
// their values to make a file menu. If the value of the param contains a ";",
// then the first part, up to the ";", goes into the menu and the second part
// is the name of the file. If there is no ";", then the entire value is
// shown in the menu and is also used as the name of the file. The actual
// files must be in the same directory as the Web page that contains the applet.
Vector names = new Vector();
fileMenu = new Choice();
String file = getParameter("File");
int ct = 1;
if (file == null) {
file = getParameter("File1");
ct = 2;
}
while (file != null) {
file = file.trim();
int pos = file.indexOf(";");
String menuEntry;
if (pos == -1)
menuEntry = file;
else {
menuEntry = file.substring(0,pos).trim();
file = file.substring(pos+1).trim();
}
names.addElement(file);
fileMenu.add(menuEntry);
file = getParameter("File" + ct);
ct++;
}
if (names.size() == 0) {
fileMenu = null;
return null;
}
else {
fileNames = new String[names.size()];
for (int i = 0; i < names.size(); i++)
fileNames[i] = (String)names.elementAt(i);
Panel p = new Panel();
p.setBackground(Color.lightGray);
p.setLayout(new BorderLayout(5,5));
p.add(fileMenu,BorderLayout.CENTER);
loadFileButton = new Button("Load Data File: ");
loadFileButton.addActionListener(this);
p.add(loadFileButton,BorderLayout.WEST);
fileMenu.setBackground(Color.white);
return p;
}
}
private void doLoadFile(String name) {
// Load the file from the same directory as the Web page and put the data
// from the file into the table. The file should contain two numbers on
// each line.
InputStream in;
try {
URL url = new URL(getDocumentBase(), name);
in = url.openStream();
}
catch (Exception e) {
canvas.setErrorMessage(null,"Unable to open file named \"" + name + "\": " + e);
return;
}
Reader inputReader = new InputStreamReader(in);
try {
table.readFromStream(inputReader);
inputReader.close();
}
catch (Exception e) {
canvas.setErrorMessage(null,"Unable to get data from file \"" + name + "\": " + e.getMessage());
return;
}
mainController.rupute();
}
/**
* Respond when user clicks a button; not meant to be called directly.
* This opens and closes the separate window.
*/
synchronized public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
if (loadFileButton != null && source == loadFileButton) {
doLoadFile( fileNames[fileMenu.getSelectedIndex()] );
}
else if (source == launchButton && launchButton != null) {
// Open or close separate frame.
launchButton.setEnabled(false);
if (frame == null) {
frame = new Frame(frameTitle);
frame.add(makeMainPanel());
frame.addWindowListener( new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
frame.dispose();
}
public void windowClosed(WindowEvent evt) {
frameClosed();
}
} );
frame.pack();
frame.setLocation(50,50);
frame.show();
launchButton.setLabel("Close Window");
launchButton.setEnabled(true);
}
else {
frame.dispose();
}
}
}
synchronized private void frameClosed() {
// respond when separate window closes.
frame = null;
launchButton.setLabel(launchButtonName);
launchButton.setEnabled(true);
}
/**
* Return the applet parameter with a given param name, but if no
* such applet param exists, return a default value instead.
*/
protected String getParameter(String paramName, String defaultValue) {
String val = getParameter(paramName);
return (val == null)? defaultValue : val;
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new SimpleGraph();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class ScatterPlotApplet
</source>
Spline Editor
<source lang="java">
/**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.awt.*; import java.awt.datatransfer.*; import java.awt.event.*; import java.awt.geom.*; import java.beans.*; import java.io.*; import java.text.*; import java.util.*; import javax.imageio.*; import javax.swing.*; import javax.swing.event.*; import java.awt.image.*; import org.jdesktop.animation.timing.interpolation.*; import org.jdesktop.animation.timing.*; import org.jdesktop.animation.timing.Animator.*; import org.jdesktop.animation.timing.interpolation.*; import java.awt.image.*; import javax.swing.border.*; import java.net.*; public class SplineEditor extends JFrame {
public SplineEditor() throws HeadlessException {
super("Spline Editor");
add(buildHeader(), BorderLayout.NORTH);
add(buildControlPanel(), BorderLayout.CENTER);
pack();
setLocationRelativeTo(null);
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private Component buildHeader() {
ImageIcon icon = new ImageIcon(getClass().getResource("simulator.png"));
HeaderPanel header = new HeaderPanel(icon,
"Timing Framework Spline Editor",
"Drag control points in the display to change the shape of the spline.",
"Click the Copy Code button to generate the corresponding Java code.");
return header;
}
private Component buildControlPanel() {
return new SplineControlPanel();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
} catch (UnsupportedLookAndFeelException e) {
}
new SplineEditor().setVisible(true);
}
});
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class EquationDisplay extends JComponent implements PropertyChangeListener {
private static final Color COLOR_BACKGROUND = Color.WHITE;
private static final Color COLOR_MAJOR_GRID = Color.GRAY.brighter();
private static final Color COLOR_MINOR_GRID = new Color(220, 220, 220);
private static final Color COLOR_AXIS = Color.BLACK;
private static final float STROKE_AXIS = 1.2f;
private static final float STROKE_GRID = 1.0f;
private static final float COEFF_ZOOM = 1.1f;
private java.util.List<DrawableEquation> equations;
protected double minX;
protected double maxX;
protected double minY;
protected double maxY;
private double originX;
private double originY;
private double majorX;
private int minorX;
private double majorY;
private int minorY;
private boolean drawText = true;
private Point dragStart;
private NumberFormat formatter;
private ZoomHandler zoomHandler;
private PanMotionHandler panMotionHandler;
private PanHandler panHandler;
public EquationDisplay(double originX, double originY,
double minX, double maxX,
double minY, double maxY,
double majorX, int minorX,
double majorY, int minorY) {
if (minX >= maxX) {
throw new IllegalArgumentException("minX must be < to maxX");
}
if (originX < minX || originX > maxX) {
throw new IllegalArgumentException("originX must be between minX and maxX");
}
if (minY >= maxY) {
throw new IllegalArgumentException("minY must be < to maxY");
}
if (originY < minY || originY > maxY) {
throw new IllegalArgumentException("originY must be between minY and maxY");
}
if (minorX <= 0) {
throw new IllegalArgumentException("minorX must be > 0");
}
if (minorY <= 0) {
throw new IllegalArgumentException("minorY must be > 0");
}
if (majorX <= 0.0) {
throw new IllegalArgumentException("majorX must be > 0.0");
}
if (majorY <= 0.0) {
throw new IllegalArgumentException("majorY must be > 0.0");
}
this.originX = originX;
this.originY = originY;
this.minX = minX;
this.maxX = maxX;
this.minY = minY;
this.maxY = maxY;
this.majorX = majorX;
this.minorX = minorX;
this.majorY = majorY;
this.minorY = minorY;
this.equations = new LinkedList<DrawableEquation>();
this.formatter = NumberFormat.getInstance();
this.formatter.setMaximumFractionDigits(2);
panHandler = new PanHandler();
addMouseListener(panHandler);
panMotionHandler = new PanMotionHandler();
addMouseMotionListener(panMotionHandler);
zoomHandler = new ZoomHandler();
addMouseWheelListener(zoomHandler);
}
@Override
public void setEnabled(boolean enabled) {
if (isEnabled() != enabled) {
//super.setEnabled(enabled);
if (enabled) {
addMouseListener(panHandler);
addMouseMotionListener(panMotionHandler);
addMouseWheelListener(zoomHandler);
} else {
removeMouseListener(panHandler);
removeMouseMotionListener(panMotionHandler);
removeMouseWheelListener(zoomHandler);
}
}
}
public boolean isDrawText() {
return drawText;
}
public void setDrawText(boolean drawText) {
this.drawText = drawText;
}
public void addEquation(AbstractEquation equation, Color color) {
if (equation != null && !equations.contains(equation)) {
equation.addPropertyChangeListener(this);
equations.add(new DrawableEquation(equation, color));
repaint();
}
}
public void removeEquation(AbstractEquation equation) {
if (equation != null) {
DrawableEquation toRemove = null;
for (DrawableEquation drawable: equations) {
if (drawable.getEquation() == equation) {
toRemove = drawable;
break;
}
}
if (toRemove != null) {
equation.removePropertyChangeListener(this);
equations.remove(toRemove);
repaint();
}
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
public void propertyChange(PropertyChangeEvent evt) {
repaint();
}
protected double yPositionToPixel(double position) {
double height = (double) getHeight();
return height - ((position - minY) * height / (maxY - minY));
}
protected double xPositionToPixel(double position) {
return (position - minX) * (double) getWidth() / (maxX - minX);
}
protected double xPixelToPosition(double pixel) {
double axisV = xPositionToPixel(originX);
return (pixel - axisV) * (maxX - minX) / (double) getWidth();
}
protected double yPixelToPosition(double pixel) {
double axisH = yPositionToPixel(originY);
return (getHeight() - pixel - axisH) * (maxY - minY) / (double) getHeight();
}
@Override
protected void paintComponent(Graphics g) {
if (!isVisible()) {
return;
}
Graphics2D g2 = (Graphics2D) g;
setupGraphics(g2);
paintBackground(g2);
drawGrid(g2);
drawAxis(g2);
drawEquations(g2);
paintInformation(g2);
}
protected void paintInformation(Graphics2D g2) {
}
private void drawEquations(Graphics2D g2) {
for (DrawableEquation drawable: equations) {
g2.setColor(drawable.getColor());
drawEquation(g2, drawable.getEquation());
}
}
private void drawEquation(Graphics2D g2, AbstractEquation equation) {
float x = 0.0f;
float y = (float) yPositionToPixel(equation.rupute(xPixelToPosition(0.0)));
GeneralPath path = new GeneralPath();
path.moveTo(x, y);
for (x = 0.0f; x < getWidth(); x += 1.0f) {
double position = xPixelToPosition(x);
y = (float) yPositionToPixel(equation.rupute(position));
path.lineTo(x, y);
}
g2.draw(path);
}
private void drawGrid(Graphics2D g2) {
Stroke stroke = g2.getStroke();
drawVerticalGrid(g2);
drawHorizontalGrid(g2);
if (drawText) {
drawVerticalLabels(g2);
drawHorizontalLabels(g2);
}
g2.setStroke(stroke);
}
private void drawHorizontalLabels(Graphics2D g2) {
double axisV = xPositionToPixel(originX);
g2.setColor(COLOR_AXIS);
for (double y = originY + majorY; y < maxY + majorY; y += majorY) {
int position = (int) yPositionToPixel(y);
g2.drawString(formatter.format(y), (int) axisV + 5, position);
}
for (double y = originY - majorY; y > minY - majorY; y -= majorY) {
int position = (int) yPositionToPixel(y);
g2.drawString(formatter.format(y), (int) axisV + 5, position);
}
}
private void drawHorizontalGrid(Graphics2D g2) {
double minorSpacing = majorY / minorY;
double axisV = xPositionToPixel(originX);
Stroke gridStroke = new BasicStroke(STROKE_GRID);
Stroke axisStroke = new BasicStroke(STROKE_AXIS);
for (double y = originY + majorY; y < maxY + majorY; y += majorY) {
g2.setStroke(gridStroke);
g2.setColor(COLOR_MINOR_GRID);
for (int i = 0; i < minorY; i++) {
int position = (int) yPositionToPixel(y - i * minorSpacing);
g2.drawLine(0, position, getWidth(), position);
}
int position = (int) yPositionToPixel(y);
g2.setColor(COLOR_MAJOR_GRID);
g2.drawLine(0, position, getWidth(), position);
g2.setStroke(axisStroke);
g2.setColor(COLOR_AXIS);
g2.drawLine((int) axisV - 3, position, (int) axisV + 3, position);
}
for (double y = originY - majorY; y > minY - majorY; y -= majorY) {
g2.setStroke(gridStroke);
g2.setColor(COLOR_MINOR_GRID);
for (int i = 0; i < minorY; i++) {
int position = (int) yPositionToPixel(y + i * minorSpacing);
g2.drawLine(0, position, getWidth(), position);
}
int position = (int) yPositionToPixel(y);
g2.setColor(COLOR_MAJOR_GRID);
g2.drawLine(0, position, getWidth(), position);
g2.setStroke(axisStroke);
g2.setColor(COLOR_AXIS);
g2.drawLine((int) axisV - 3, position, (int) axisV + 3, position);
}
}
private void drawVerticalLabels(Graphics2D g2) {
double axisH = yPositionToPixel(originY);
FontMetrics metrics = g2.getFontMetrics();
g2.setColor(COLOR_AXIS);
for (double x = originX + majorX; x < maxX + majorX; x += majorX) {
int position = (int) xPositionToPixel(x);
g2.drawString(formatter.format(x), position, (int) axisH + metrics.getHeight());
}
for (double x = originX - majorX; x > minX - majorX; x -= majorX) {
int position = (int) xPositionToPixel(x);
g2.drawString(formatter.format(x), position, (int) axisH + metrics.getHeight());
}
}
private void drawVerticalGrid(Graphics2D g2) {
double minorSpacing = majorX / minorX;
double axisH = yPositionToPixel(originY);
Stroke gridStroke = new BasicStroke(STROKE_GRID);
Stroke axisStroke = new BasicStroke(STROKE_AXIS);
for (double x = originX + majorX; x < maxX + majorX; x += majorX) {
g2.setStroke(gridStroke);
g2.setColor(COLOR_MINOR_GRID);
for (int i = 0; i < minorX; i++) {
int position = (int) xPositionToPixel(x - i * minorSpacing);
g2.drawLine(position, 0, position, getHeight());
}
int position = (int) xPositionToPixel(x);
g2.setColor(COLOR_MAJOR_GRID);
g2.drawLine(position, 0, position, getHeight());
g2.setStroke(axisStroke);
g2.setColor(COLOR_AXIS);
g2.drawLine(position, (int) axisH - 3, position, (int) axisH + 3);
}
for (double x = originX - majorX; x > minX - majorX; x -= majorX) {
g2.setStroke(gridStroke);
g2.setColor(COLOR_MINOR_GRID);
for (int i = 0; i < minorX; i++) {
int position = (int) xPositionToPixel(x + i * minorSpacing);
g2.drawLine(position, 0, position, getHeight());
}
int position = (int) xPositionToPixel(x);
g2.setColor(COLOR_MAJOR_GRID);
g2.drawLine(position, 0, position, getHeight());
g2.setStroke(axisStroke);
g2.setColor(COLOR_AXIS);
g2.drawLine(position, (int) axisH - 3, position, (int) axisH + 3);
}
}
private void drawAxis(Graphics2D g2) {
double axisH = yPositionToPixel(originY);
double axisV = xPositionToPixel(originX);
g2.setColor(COLOR_AXIS);
Stroke stroke = g2.getStroke();
g2.setStroke(new BasicStroke(STROKE_AXIS));
g2.drawLine(0, (int) axisH, getWidth(), (int) axisH);
g2.drawLine((int) axisV, 0, (int) axisV, getHeight());
FontMetrics metrics = g2.getFontMetrics();
g2.drawString(formatter.format(0.0), (int) axisV + 5, (int) axisH + metrics.getHeight());
g2.setStroke(stroke);
}
protected void setupGraphics(Graphics2D g2) {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
protected void paintBackground(Graphics2D g2) {
g2.setColor(COLOR_BACKGROUND);
g2.fill(g2.getClipBounds());
}
private class DrawableEquation {
private AbstractEquation equation;
private Color color;
DrawableEquation(AbstractEquation equation, Color color) {
this.equation = equation;
this.color = color;
}
AbstractEquation getEquation() {
return equation;
}
Color getColor() {
return color;
}
}
private class ZoomHandler implements MouseWheelListener {
public void mouseWheelMoved(MouseWheelEvent e) {
double distanceX = maxX - minX;
double distanceY = maxY - minY;
double cursorX = minX + distanceX / 2.0;
double cursorY = minY + distanceY / 2.0;
int rotation = e.getWheelRotation();
if (rotation < 0) {
distanceX /= COEFF_ZOOM;
distanceY /= COEFF_ZOOM;
} else {
distanceX *= COEFF_ZOOM;
distanceY *= COEFF_ZOOM;
}
minX = cursorX - distanceX / 2.0;
maxX = cursorX + distanceX / 2.0;
minY = cursorY - distanceY / 2.0;
maxY = cursorY + distanceY / 2.0;
repaint();
}
}
private class PanHandler extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
dragStart = e.getPoint();
}
}
private class PanMotionHandler extends MouseMotionAdapter {
@Override
public void mouseDragged(MouseEvent e) {
Point dragEnd = e.getPoint();
double distance = xPixelToPosition(dragEnd.getX()) -
xPixelToPosition(dragStart.getX());
minX -= distance;
maxX -= distance;
distance = yPixelToPosition(dragEnd.getY()) -
yPixelToPosition(dragStart.getY());
minY -= distance;
maxY -= distance;
repaint();
dragStart = dragEnd;
}
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
interface Equation {
public double compute(double variable);
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
abstract class AbstractEquation implements Equation {
protected java.util.List<PropertyChangeListener> listeners;
protected AbstractEquation() {
this.listeners = new LinkedList<PropertyChangeListener>();
}
public void addPropertyChangeListener(PropertyChangeListener listener) {
if (listener != null && !listeners.contains(listener)) {
listeners.add(listener);
}
}
public void removePropertyChangeListener(PropertyChangeListener listener) {
if (listener != null) {
listeners.remove(listener);
}
}
protected void firePropertyChange(String propertyName,
double oldValue,
double newValue) {
PropertyChangeEvent changeEvent = new PropertyChangeEvent(this,
propertyName,
oldValue,
newValue);
for (PropertyChangeListener listener: listeners) {
listener.propertyChange(changeEvent);
}
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class AbstractSimulator extends JComponent {
protected double time;
public AbstractSimulator() {
this.time = 0.0f;
}
public void setTime(double time) {
this.time = time;
repaint();
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class BouncerSimulator extends AbstractSimulator {
private static final Color COLOR_BACKGROUND = Color.WHITE;
private BufferedImage image;
public BouncerSimulator() {
try {
image = ImageIO.read(BouncerSimulator.class.getResource("item.png"));
} catch (Exception e) { }
}
@Override
protected void paintComponent(Graphics g) {
if (!isVisible()) {
return;
}
Graphics2D g2 = (Graphics2D) g;
setupGraphics(g2);
drawBackground(g2);
drawItem(g2);
}
private void drawItem(Graphics2D g2) {
double position = time;
double xPos = position * getWidth() / 2;
int width = getWidth() * 2 / 3;
int x = (getWidth() - width) / 2;
x += xPos;
int y = getHeight() / 2;
y -= image.getHeight() / 2;
g2.drawImage(image, null, x, y);
}
private void setupGraphics(Graphics2D g2) {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
private void drawBackground(Graphics2D g2) {
g2.setColor(COLOR_BACKGROUND);
g2.fill(g2.getClipBounds());
}
@Override
public Dimension getPreferredSize() {
return new Dimension(150, 100);
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class DropSimulator extends AbstractSimulator {
private static final Color COLOR_BACKGROUND = Color.WHITE;
private BufferedImage image;
private BufferedImage shadow;
private float angle = 90;
private int distance = 20;
// cached values for fast painting
private int distance_x = 0;
private int distance_y = 0;
public DropSimulator() {
try {
image = ImageIO.read(BouncerSimulator.class.getResource("icon.png"));
ShadowFactory factory = new ShadowFactory(5, 0.5f, Color.BLACK);
shadow = factory.createShadow(image);
} catch (Exception e) { }
}
@Override
protected void paintComponent(Graphics g) {
if (!isVisible()) {
return;
}
Graphics2D g2 = (Graphics2D) g;
setupGraphics(g2);
drawBackground(g2);
drawItem(g2);
}
private void drawItem(Graphics2D g2) {
double position = time;
int width = (int) (shadow.getWidth() / 2 * (1.0 + position));
int height = (int) (shadow.getHeight() / 2 * (1.0 + position));
int x = (getWidth() - width) / 2;
int y = (getHeight() - height) / 2;
Composite composite = g2.getComposite();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
1.0f - (0.5f * (float) position)));
computeShadowPosition((position * distance) + 1.0);
g2.drawImage(shadow, x + distance_x, y + distance_y, width, height, null);
g2.setComposite(composite);
width = (int) (image.getWidth() / 2 * (1.0 + position));
height = (int) (image.getHeight() / 2 * (1.0 + position));
x = (getWidth() - width) / 2;
y = (getHeight() - height) / 2;
g2.drawImage(image, x, y, width, height, null);
}
private void setupGraphics(Graphics2D g2) {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
}
private void drawBackground(Graphics2D g2) {
g2.setColor(COLOR_BACKGROUND);
g2.fill(g2.getClipBounds());
}
@Override
public Dimension getPreferredSize() {
return new Dimension(150, 100);
}
private void computeShadowPosition(double distance) {
double angleRadians = Math.toRadians(angle);
distance_x = (int) (Math.cos(angleRadians) * distance);
distance_y = (int) (Math.sin(angleRadians) * distance);
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class HeaderPanel extends JPanel {
private ImageIcon icon;
HeaderPanel(ImageIcon icon,
String title,
String help1,
String help2) {
super(new BorderLayout());
this.icon = icon;
JPanel titlesPanel = new JPanel(new GridLayout(3, 1));
titlesPanel.setOpaque(false);
titlesPanel.setBorder(new EmptyBorder(12, 0, 12, 0));
JLabel headerTitle = new JLabel(title);
Font police = headerTitle.getFont().deriveFont(Font.BOLD);
headerTitle.setFont(police);
headerTitle.setBorder(new EmptyBorder(0, 12, 0, 0));
titlesPanel.add(headerTitle);
JLabel message;
titlesPanel.add(message = new JLabel(help1));
police = headerTitle.getFont().deriveFont(Font.PLAIN);
message.setFont(police);
message.setBorder(new EmptyBorder(0, 24, 0, 0));
titlesPanel.add(message = new JLabel(help2));
police = headerTitle.getFont().deriveFont(Font.PLAIN);
message.setFont(police);
message.setBorder(new EmptyBorder(0, 24, 0, 0));
message = new JLabel(this.icon);
message.setBorder(new EmptyBorder(0, 0, 0, 12));
add(BorderLayout.WEST, titlesPanel);
add(BorderLayout.EAST, message);
add(BorderLayout.SOUTH, new JSeparator(JSeparator.HORIZONTAL));
setPreferredSize(new Dimension(500, this.icon.getIconHeight() + 24));
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (!isOpaque()) {
return;
}
Rectangle bounds = g.getClipBounds();
Color control = UIManager.getColor("control");
int width = getWidth();
Graphics2D g2 = (Graphics2D) g;
Paint storedPaint = g2.getPaint();
g2.setPaint(new GradientPaint(this.icon.getIconWidth(), 0, Color.white, width, 0, control));
g2.fillRect(bounds.x, bounds.y, bounds.width, bounds.height);
g2.setPaint(storedPaint);
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class Java2dHelper {
public static BufferedImage createCompatibleImage(int width, int height) {
GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice screenDevice = environment.getDefaultScreenDevice();
GraphicsConfiguration configuration = screenDevice.getDefaultConfiguration();
return configuration.createCompatibleImage(width, height);
}
public static BufferedImage loadCompatibleImage(URL resource) throws IOException {
BufferedImage image = ImageIO.read(resource);
BufferedImage compatibleImage = createCompatibleImage(image.getWidth(), image.getHeight());
Graphics g = compatibleImage.getGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
image = null;
return compatibleImage;
}
public static BufferedImage createThumbnail(BufferedImage image, int requestedThumbSize) {
float ratio = (float) image.getWidth() / (float) image.getHeight();
int width = image.getWidth();
BufferedImage thumb = image;
do {
width /= 2;
if (width < requestedThumbSize) {
width = requestedThumbSize;
}
BufferedImage temp = new BufferedImage(width, (int) (width / ratio), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
thumb = temp;
} while (width != requestedThumbSize);
return thumb;
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/**
*A shadow factory generates a drop shadow for any given picture, respecting * the transparency channel if present. The resulting picture contains the * shadow only and to create a drop shadow effect you will need to stack the * original picture and the shadow generated by the factory. If you are using * Swing you can get this done very easily with the layout * {@link org.jdesktop.swingx.StackLayout}.
*Shadow Properties
*A shadow is defined by three properties: *
-
*
- size: The size, in pixels, of the shadow. This property also * defines the fuzzyness. *
- opacity: The opacity, between 0.0 and 1.0, of the shadow. *
- color: The color of the shadow. Shadows are not meant to be * black only. *
* You can set these properties using the provided mutaters or the appropriate * constructor. Here are two ways of creating a green shadow of size 10 and * with an opacity of 50%:*
* ShadowFactory factory = new ShadowFactory(10, 0.5f, Color.GREEN); * // .. * factory = new ShadowFactory(); * factory.setSize(10); * factory.setOpacity(0.5f); * factory.setColor(Color.GREEN); *
* The default constructor provides the following default values:*
-
*
- size: 5 pixels *
- opacity: 50% *
- color: Black *
Shadow Quality
*The factory provides two shadow generation algorithms: fast quality blur * and high quality blur. You can select your preferred algorithm by * setting the appropriate rendering hint: *
* ShadowFactory factory = new ShadowFactory(); * factory.setRenderingHint(ShadowFactory.KEY_BLUR_QUALITY, * ShadowFactory.VALUE_BLUR_QUALITY_HIGH); ** The default rendering algorihtm is
VALUE_BLUR_QUALITY_FAST.
* The current implementation should provide the same quality with both * algorithms but performances are guaranteed to be better (about 30 times * faster) with the fast quality blur.
*Generating a Shadow
*A shadow is generated as a BufferedImage from another
* BufferedImage. Once the factory is set up, you must call
* {@link #createShadow} to actually generate the shadow:
*
* ShadowFactory factory = new ShadowFactory(); * // factory setup * BufferedImage shadow = factory.createShadow(bufferedImage); *
* The resulting image is of type BufferedImage.TYPE_INT_ARGB.
* Both dimensions of this image are larger than original image"s:
* -
*
- new width = original width + 2 * shadow size *
- new height = original height + 2 * shadow size *
Properties Changes
*This factory allows to register property change listeners with * {@link #addPropertyChangeListener}. Listening to properties changes is very * useful when you emebed the factory in a graphical component and give the API * user the ability to access the factory. By listening to properties changes, * you can easily repaint the component when needed.
*Threading Issues
*ShadowFactory is not guaranteed to be thread-safe.
* * @author Romain Guy <romain.guy@mac.ru> * @author Sébastien Petrucci <sebastien_petrucci@yahoo.fr> */
class ShadowFactory {
/***
Key for the blur quality rendering hint.
*/ public static final String KEY_BLUR_QUALITY = "blur_quality"; /***
Selects the fast rendering algorithm. This is the default rendering
* hint for KEY_BLUR_QUALITY.
*/ public static final String VALUE_BLUR_QUALITY_FAST = "fast"; /***
Selects the high quality rendering algorithm. With current implementation, * This algorithm does not guarantee a better rendering quality and should * not be used.
*/ public static final String VALUE_BLUR_QUALITY_HIGH = "high"; /***
Identifies a change to the size used to render the shadow.
*When the property change event is fired, the old value and the new
* value are provided as Integer instances.
*/ public static final String SIZE_CHANGED_PROPERTY = "shadow_size"; /***
Identifies a change to the opacity used to render the shadow.
*When the property change event is fired, the old value and the new
* value are provided as Float instances.
*/ public static final String OPACITY_CHANGED_PROPERTY = "shadow_opacity"; /***
Identifies a change to the color used to render the shadow.
*/ public static final String COLOR_CHANGED_PROPERTY = "shadow_color"; // size of the shadow in pixels (defines the fuzziness) private int size = 5; // opacity of the shadow private float opacity = 0.5f; // color of the shadow private Color color = Color.BLACK; // rendering hints map private HashMap<Object, Object> hints; // notifies listeners of properties changes private PropertyChangeSupport changeSupport; /***
Creates a default good looking shadow generator. * The default shadow factory provides the following default values: *
-
*
- size: 5 pixels *
- opacity: 50% *
- color: Black *
- rendering quality: VALUE_BLUR_QUALITY_FAST *
These properties provide a regular, good looking shadow.
*/
public ShadowFactory() {
this(5, 0.5f, Color.BLACK);
}
/**
* A shadow factory needs three properties to generate shadows. * These properties are:
*-
*
- size: The size, in pixels, of the shadow. This property also * defines the fuzzyness. *
- opacity: The opacity, between 0.0 and 1.0, of the shadow. *
- color: The color of the shadow. Shadows are not meant to be * black only. *
Besides these properties you can set rendering hints to control the * rendering process. The default rendering hints let the factory use the * fastest shadow generation algorithm.
* @param size The size of the shadow in pixels. Defines the fuzziness.
* @param opacity The opacity of the shadow.
* @param color The color of the shadow.
* @see #setRenderingHint(Object, Object)
*/
public ShadowFactory(final int size, final float opacity, final Color color) {
hints = new HashMap<Object, Object>();
hints.put(KEY_BLUR_QUALITY, VALUE_BLUR_QUALITY_FAST);
changeSupport = new PropertyChangeSupport(this);
setSize(size);
setOpacity(opacity);
setColor(color);
}
/**
* Add a PropertyChangeListener to the listener list. The listener is
* registered for all properties. The same listener object may be added
* more than once, and will be called as many times as it is added. If
* listener is null, no exception is thrown and no action
* is taken.
* @param listener the PropertyChangeListener to be added
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
changeSupport.addPropertyChangeListener(listener);
}
/**
* Remove a PropertyChangeListener from the listener list. This removes
* a PropertyChangeListener that was registered for all properties. If
* listener was added more than once to the same event source,
* it will be notified one less time after being removed. If
* listener is null, or was never added, no exception is thrown
* and no action is taken.
* @param listener
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
changeSupport.removePropertyChangeListener(listener);
}
/**
* Maps the specified rendering hint key to the specified
* value in this SahdowFactory object.
* @param key The rendering hint key
* @param value The rendering hint value
*/
public void setRenderingHint(final Object key, final Object value) {
hints.put(key, value);
}
/**
* Gets the color used by the factory to generate shadows.
* @return this factory"s shadow color
*/
public Color getColor() {
return color;
}
/**
* Sets the color used by the factory to generate shadows.
*Consecutive calls to {@link #createShadow} will all use this color * until it is set again.
*If the color provided is null, the previous color will be retained.
* @param shadowColor the generated shadows color
*/
public void setColor(final Color shadowColor) {
if (shadowColor != null) {
Color oldColor = this.color;
this.color = shadowColor;
changeSupport.firePropertyChange(COLOR_CHANGED_PROPERTY,
oldColor,
this.color);
}
}
/**
* Gets the opacity used by the factory to generate shadows.
*The opacity is comprised between 0.0f and 1.0f; 0.0f being fully * transparent and 1.0f fully opaque.
* @return this factory"s shadow opacity
*/
public float getOpacity() {
return opacity;
}
/**
* Sets the opacity used by the factory to generate shadows.
*Consecutive calls to {@link #createShadow} will all use this color * until it is set again.
*The opacity is comprised between 0.0f and 1.0f; 0.0f being fully * transparent and 1.0f fully opaque. If you provide a value out of these * boundaries, it will be restrained to the closest boundary.
* @param shadowOpacity the generated shadows opacity
*/
public void setOpacity(final float shadowOpacity) {
float oldOpacity = this.opacity;
if (shadowOpacity < 0.0) {
this.opacity = 0.0f;
} else if (shadowOpacity > 1.0f) {
this.opacity = 1.0f;
} else {
this.opacity = shadowOpacity;
}
changeSupport.firePropertyChange(OPACITY_CHANGED_PROPERTY,
new Float(oldOpacity),
new Float(this.opacity));
}
/**
* Gets the size in pixel used by the factory to generate shadows.
* @return this factory"s shadow size
*/
public int getSize() {
return size;
}
/**
* Sets the size, in pixels, used by the factory to generate shadows.
*The size defines the blur radius applied to the shadow to create the * fuzziness.
*There is virtually no limit to the size but it has an impact on shadow * generation performances. The greater this value, the longer it will take * to generate the shadow. Remember the generated shadow image dimensions * are computed as follow: *
-
*
- new width = original width + 2 * shadow size *
- new height = original height + 2 * shadow size *
* The size cannot be negative. If you provide a negative value, the size* will be 0 instead.
* @param shadowSize the generated shadows size in pixels (fuzziness)
*/
public void setSize(final int shadowSize) {
int oldSize = this.size;
if (shadowSize < 0) {
this.size = 0;
} else {
this.size = shadowSize;
}
changeSupport.firePropertyChange(SIZE_CHANGED_PROPERTY,
new Integer(oldSize),
new Integer(this.size));
}
/**
* Generates the shadow for a given picture and the current properties * of the factory.
*The generated shadow image dimensions are computed as follow: *
-
*
- new width = original width + 2 * shadow size *
- new height = original height + 2 * shadow size *
The time taken by a call to this method depends on the size of the * shadow, the larger the longer it takes, and on the selected rendering * algorithm.
* @param image the picture from which the shadow must be cast
* @return the picture containing the shadow of image
*/
public BufferedImage createShadow(final BufferedImage image) {
if (hints.get(KEY_BLUR_QUALITY) == VALUE_BLUR_QUALITY_HIGH) {
// the high quality algorithm is a 3-pass algorithm
// it goes through all the pixels of the original picture at least
// three times to generate the shadow
// it is easy to understand but very slow
BufferedImage subject = prepareImage(image);
BufferedImage shadow = new BufferedImage(subject.getWidth(),
subject.getHeight(),
BufferedImage.TYPE_INT_ARGB);
BufferedImage shadowMask = createShadowMask(subject);
getLinearBlurOp(size).filter(shadowMask, shadow);
return shadow;
}
// call the fast rendering algorithm
return createShadowFast(image);
}
// prepares the picture for the high quality rendering algorithm
private BufferedImage prepareImage(final BufferedImage image) {
BufferedImage subject = new BufferedImage(image.getWidth() + size * 2,
image.getHeight() + size * 2,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = subject.createGraphics();
g2.drawImage(image, null, size, size);
g2.dispose();
return subject;
}
// fast rendering algorithm
// basically applies duplicates the picture and applies a size*size kernel
// in only one pass.
// the kernel is simulated by an horizontal and a vertical pass
// implemented by Sébastien Petrucci
private BufferedImage createShadowFast(final BufferedImage src) {
int shadowSize = this.size;
int srcWidth = src.getWidth();
int srcHeight = src.getHeight();
int dstWidth = srcWidth + size;
int dstHeight = srcHeight + size;
int left = (shadowSize - 1) >> 1;
int right = shadowSize - left;
int yStop = dstHeight - right;
BufferedImage dst = new BufferedImage(dstWidth, dstHeight,
BufferedImage.TYPE_INT_ARGB);
int shadowRgb = color.getRGB() & 0x00FFFFFF;
int[] aHistory = new int[shadowSize];
int historyIdx;
int aSum;
ColorModel srcColorModel = src.getColorModel();
WritableRaster srcRaster = src.getRaster();
int[] dstBuffer = ((DataBufferInt) dst.getRaster().getDataBuffer()).getData();
int lastPixelOffset = right * dstWidth;
float hSumDivider = 1.0f / size;
float vSumDivider = opacity / size;
// horizontal pass : extract the alpha mask from the source picture and
// blur it into the destination picture
for (int srcY = 0, dstOffset = left * dstWidth; srcY < srcHeight; srcY++) {
// first pixels are empty
for (historyIdx = 0; historyIdx < shadowSize; ) {
aHistory[historyIdx++] = 0;
}
aSum = 0;
historyIdx = 0;
// compute the blur average with pixels from the source image
for (int srcX = 0; srcX < srcWidth; srcX++) {
int a = (int) (aSum * hSumDivider); // calculate alpha value
dstBuffer[dstOffset++] = a << 24; // store the alpha value only
// the shadow color will be added in the next pass
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
// extract the new pixel ...
a = srcColorModel.getAlpha(srcRaster.getDataElements(srcX, srcY, null));
aHistory[historyIdx] = a; // ... and store its value into history
aSum += a; // ... and add its value to the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
// blur the end of the row - no new pixels to grab
for (int i = 0; i < shadowSize; i++) {
int a = (int) (aSum * hSumDivider);
dstBuffer[dstOffset++] = a << 24;
// substract the oldest pixel from the sum ... and nothing new to add !
aSum -= aHistory[historyIdx];
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
}
// vertical pass
for (int x = 0, bufferOffset = 0; x < dstWidth; x++, bufferOffset = x) {
aSum = 0;
// first pixels are empty
for (historyIdx = 0; historyIdx < left;) {
aHistory[historyIdx++] = 0;
}
// and then they come from the dstBuffer
for (int y = 0; y < right; y++, bufferOffset += dstWidth) {
int a = dstBuffer[bufferOffset] >>> 24; // extract alpha
aHistory[historyIdx++] = a; // store into history
aSum += a; // and add to sum
}
bufferOffset = x;
historyIdx = 0;
// compute the blur average with pixels from the previous pass
for (int y = 0; y < yStop; y++, bufferOffset += dstWidth) {
int a = (int) (aSum * vSumDivider); // calculate alpha value
dstBuffer[bufferOffset] = a << 24 | shadowRgb; // store alpha value + shadow color
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
a = dstBuffer[bufferOffset + lastPixelOffset] >>> 24; // extract the new pixel ...
aHistory[historyIdx] = a; // ... and store its value into history
aSum += a; // ... and add its value to the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
// blur the end of the column - no pixels to grab anymore
for (int y = yStop; y < dstHeight; y++, bufferOffset += dstWidth) {
int a = (int) (aSum * vSumDivider);
dstBuffer[bufferOffset] = a << 24 | shadowRgb;
aSum -= aHistory[historyIdx]; // substract the oldest pixel from the sum
if (++historyIdx >= shadowSize) {
historyIdx -= shadowSize;
}
}
}
return dst;
}
// creates the shadow mask for the original picture
// it colorize all the pixels with the shadow color according to their
// original transparency
private BufferedImage createShadowMask(final BufferedImage image) {
BufferedImage mask = new BufferedImage(image.getWidth(),
image.getHeight(),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = mask.createGraphics();
g2d.drawImage(image, 0, 0, null);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_IN,
opacity));
g2d.setColor(color);
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
g2d.dispose();
return mask;
}
// creates a blur convolve operation by generating a kernel of
// dimensions (size, size).
private ConvolveOp getLinearBlurOp(final int size) {
float[] data = new float[size * size];
float value = 1.0f / (float) (size * size);
for (int i = 0; i < data.length; i++) {
data[i] = value;
}
return new ConvolveOp(new Kernel(size, size, data));
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class SplineControlPanel extends JPanel {
private SplineDisplay display;
private DropSimulator dropSimulator = new DropSimulator();
private BouncerSimulator bounceSimulator = new BouncerSimulator();
private int linesCount = 0;
private JLabel labelControl1;
private JLabel labelControl2;
private Animator controller;
SplineControlPanel() {
super(new BorderLayout());
add(buildEquationDisplay(), BorderLayout.CENTER);
add(buildDebugControls(), BorderLayout.EAST);
}
private Component buildDebugControls() {
JButton button;
JPanel debugPanel = new JPanel(new GridBagLayout());
debugPanel.add(Box.createHorizontalStrut(150),
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.NONE,
new Insets(0, 0, 0, 0),
0, 0));
// button = addButton(debugPanel, "Create"); // button.addActionListener(new ActionListener() { // public void actionPerformed(ActionEvent e) { // JFileChooser chooser = new JFileChooser("."); // int choice = chooser.showSaveDialog(SplineControlPanel.this); // if (choice == JFileChooser.CANCEL_OPTION) { // return; // } // File file = chooser.getSelectedFile(); // try { // OutputStream out = new FileOutputStream(file); // display.saveAsTemplate(out); // out.close(); // } catch (FileNotFoundException e1) { // } catch (IOException e1) { // } // } // });
addSeparator(debugPanel, "Control Points");
labelControl1 = addDebugLabel(debugPanel, "Point 1:", formatPoint(display.getControl1()));
labelControl2 = addDebugLabel(debugPanel, "Point 2:", formatPoint(display.getControl2()));
button = addButton(debugPanel, "Copy Code");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
NumberFormat formatter = getNumberFormatter();
Point2D c1 = display.getControl1();
Point2D c2 = display.getControl2();
StringBuilder code = new StringBuilder();
code.append("Spline spline = new Spline(");
code.append(formatter.format(c1.getX())).append("f, ");
code.append(formatter.format(c1.getY())).append("f, ");
code.append(formatter.format(c2.getX())).append("f, ");
code.append(formatter.format(c2.getY())).append("f);");
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.setContents(new StringSelection(code.toString()), null);
}
});
addEmptySpace(debugPanel, 6);
addSeparator(debugPanel, "Animation");
button = addButton(debugPanel, "Play Sample");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
startSampleAnimation();
}
});
addEmptySpace(debugPanel, 6);
addSeparator(debugPanel, "Templates");
debugPanel.add(createTemplates(),
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 0.0,
GridBagConstraints.CENTER,
GridBagConstraints.NONE,
new Insets(0, 0, 0, 0),
0, 0));
addEmptySpace(debugPanel, 6);
debugPanel.add(Box.createVerticalGlue(),
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 1.0,
GridBagConstraints.LINE_START,
GridBagConstraints.NONE,
new Insets(0, 0, 0, 0),
0, 0));
JPanel wrapper = new JPanel(new BorderLayout());
wrapper.add(new JSeparator(JSeparator.VERTICAL), BorderLayout.WEST);
wrapper.add(debugPanel);
wrapper.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 6));
return wrapper;
}
private Component createTemplates() {
DefaultListModel model = new DefaultListModel();
model.addElement(createTemplate(0.0, 0.0, 1.0, 1.0));
model.addElement(createTemplate(0.0, 1.0, 0.0, 1.0));
model.addElement(createTemplate(0.0, 1.0, 1.0, 1.0));
model.addElement(createTemplate(0.0, 1.0, 1.0, 0.0));
model.addElement(createTemplate(1.0, 0.0, 0.0, 1.0));
model.addElement(createTemplate(1.0, 0.0, 1.0, 1.0));
model.addElement(createTemplate(1.0, 0.0, 1.0, 0.0));
JList list = new JList(model);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setCellRenderer(new TemplateCellRenderer());
list.addListSelectionListener(new TemplateSelectionHandler());
JScrollPane pane = new JScrollPane(list);
pane.getViewport().setPreferredSize(new Dimension(98, 97 * 3));
return pane;
}
private JButton addButton(JPanel debugPanel, String label) {
JButton button;
debugPanel.add(button = new JButton(label),
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 0.0,
GridBagConstraints.CENTER,
GridBagConstraints.NONE,
new Insets(3, 0, 0, 0),
0, 0));
return button;
}
private String formatPoint(Point2D p) {
NumberFormat formatter = getNumberFormatter();
return "" + formatter.format(p.getX()) + ", " + formatter.format(p.getY());
}
private Component buildEquationDisplay() {
JPanel panel = new JPanel(new BorderLayout());
display = new SplineDisplay();
display.addPropertyChangeListener("control1", new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
labelControl1.setText(formatPoint(display.getControl1()));
}
});
display.addPropertyChangeListener("control2", new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
labelControl2.setText(formatPoint(display.getControl2()));
}
});
panel.add(display, BorderLayout.NORTH);
JPanel wrapper = new JPanel(new GridBagLayout());
wrapper.add(new JSeparator(),
new GridBagConstraints(0, 0,
2, 1,
1.0, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL,
new Insets(0, 0, 0, 0),
0, 0));
wrapper.add(bounceSimulator,
new GridBagConstraints(0, 1,
1, 1,
1.0, 1.0,
GridBagConstraints.CENTER,
GridBagConstraints.BOTH,
new Insets(0, 0, 0, 0),
0, 0));
wrapper.add(dropSimulator,
new GridBagConstraints(1, 1,
1, 1,
1.0, 1.0,
GridBagConstraints.CENTER,
GridBagConstraints.BOTH,
new Insets(0, 0, 0, 0),
0, 0));
panel.add(wrapper, BorderLayout.CENTER);
return panel;
}
private JLabel addDebugLabel(JPanel panel, String label, String value) {
JLabel labelComponent = new JLabel(label);
panel.add(labelComponent,
new GridBagConstraints(0, linesCount,
1, 1,
0.5, 0.0,
GridBagConstraints.LINE_END,
GridBagConstraints.NONE,
new Insets(0, 6, 0, 0),
0, 0));
labelComponent = new JLabel(value);
panel.add(labelComponent,
new GridBagConstraints(1, linesCount++,
1, 1,
0.5, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.NONE,
new Insets(0, 6, 0, 0),
0, 0));
return labelComponent;
}
private void addEmptySpace(JPanel panel, int size) {
panel.add(Box.createVerticalStrut(size),
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 0.0,
GridBagConstraints.CENTER,
GridBagConstraints.VERTICAL,
new Insets(6, 0, 0, 0),
0, 0));
}
private void addSeparator(JPanel panel, String label) {
JPanel innerPanel = new JPanel(new GridBagLayout());
innerPanel.add(new JLabel(label),
new GridBagConstraints(0, 0,
1, 1,
0.0, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.NONE,
new Insets(0, 0, 0, 0),
0, 0));
innerPanel.add(new JSeparator(),
new GridBagConstraints(1, 0,
1, 1,
0.9, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL,
new Insets(0, 6, 0, 6),
0, 0));
panel.add(innerPanel,
new GridBagConstraints(0, linesCount++,
2, 1,
1.0, 0.0,
GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL,
new Insets(6, 6, 6, 0),
0, 0));
}
private void startSampleAnimation() {
if (controller != null && controller.isRunning()) {
controller.stop();
}
Point2D control1 = display.getControl1();
Point2D control2 = display.getControl2();
Interpolator splines = new SplineInterpolator((float) control1.getX(),
(float) control1.getY(),
(float) control2.getX(), (float) control2.getY());
KeyTimes times = new KeyTimes(0.0f, 1.0f);
KeyValues values = KeyValues.create(0.0, 1.0);
KeyFrames frames = new KeyFrames(values,times, splines);
PropertySetter dropModifier = new PropertySetter(dropSimulator,
"time", frames);
PropertySetter bounceModifier = new PropertySetter(bounceSimulator,
"time", frames);
controller = new Animator(1000, 4, RepeatBehavior.REVERSE, dropModifier);
controller.setResolution(10);
controller.addTarget(bounceModifier);
controller.start();
}
private Evaluator point2dInterpolator = new Point2DNonLinearInterpolator();
private class Point2DNonLinearInterpolator extends Evaluator<Point2D> {
private Point2D value;
public Point2D evaluate(Point2D v0, Point2D v1,
float fraction) {
Point2D value = (Point2D)v0.clone();
if (v0 != v1) {
double x = value.getX();
x += (v1.getX() - v0.getX()) * fraction;
double y = value.getY();
y += (v1.getY() - v0.getY()) * fraction;
value.setLocation(x, y);
} else {
value.setLocation(v0.getX(), v0.getY());
}
return value;
}
}
private class TemplateSelectionHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting()) {
return;
}
JList list = (JList) e.getSource();
Template template = (Template) list.getSelectedValue();
if (template != null) {
if (controller != null && controller.isRunning()) {
controller.stop();
}
controller = new Animator(300,
new PropertySetter(display, "control1",
point2dInterpolator, display.getControl1(),
template.getControl1()));
controller.setResolution(10);
controller.addTarget(new PropertySetter(display, "control2",
point2dInterpolator, display.getControl2(),
template.getControl2()));
controller.start();
}
}
}
private static NumberFormat getNumberFormatter() {
NumberFormat formatter = NumberFormat.getInstance(Locale.ENGLISH);
formatter.setMinimumFractionDigits(2);
formatter.setMaximumFractionDigits(2);
return formatter;
}
private static Template createTemplate(double x1, double y1, double x2, double y2) {
return new Template(new Point2D.Double(x1, y1),
new Point2D.Double(x2, y2));
}
private static class TemplateCellRenderer extends DefaultListCellRenderer {
private boolean isSelected;
@Override
public Component getListCellRendererComponent(JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
Template template = (Template) value;
this.setBackground(Color.WHITE);
this.setIcon(new ImageIcon(template.getImage()));
this.isSelected = isSelected;
return this;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (isSelected) {
g.setColor(new Color(0.0f, 0.0f, 0.7f, 0.1f));
g.fillRect(0, 0, getWidth(), getHeight());
}
}
}
private static class Template {
private Point2D control1;
private Point2D control2;
private Image image;
public Template(Point2D control1, Point2D control2) {
this.control1 = control1;
this.control2 = control2;
}
public Point2D getControl1() {
return control1;
}
public Point2D getControl2() {
return control2;
}
public Image getImage() {
if (image == null) {
NumberFormat formatter = getNumberFormatter();
String name = "";
name += formatter.format(control1.getX()) + "-" + formatter.format(control1.getY());
name += "-";
name += formatter.format(control2.getX()) + "-" + formatter.format(control2.getY());
try {
image = ImageIO.read(getClass().getResourceAsStream(name + ".png"));
} catch (IOException e) {
}
}
return image;
}
}
} /**
* Copyright (c) 2006, Sun Microsystems, Inc * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of the TimingFramework project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
class SplineDisplay extends EquationDisplay {
private static final double CONTROL_POINT_SIZE = 12.0;
private Point2D control1 = new Point2D.Double(0.25, 0.75);
private Point2D control2 = new Point2D.Double(0.75, 0.25);
private Point2D selected = null;
private Point dragStart = null;
private boolean isSaving = false;
private PropertyChangeSupport support;
SplineDisplay() {
super(0.0, 0.0,
-0.1, 1.1, -0.1, 1.1,
0.2, 6,
0.2, 6);
setEnabled(false);
addMouseMotionListener(new ControlPointsHandler());
addMouseListener(new SelectionHandler());
support = new PropertyChangeSupport(this);
}
public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
support.addPropertyChangeListener(propertyName, listener);
}
public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
support.removePropertyChangeListener(propertyName, listener);
}
public Point2D getControl1() {
return (Point2D) control1.clone();
}
public Point2D getControl2() {
return (Point2D) control2.clone();
}
public void setControl1(Point2D control1) {
support.firePropertyChange("control1",
(Point2D) this.control1.clone(),
(Point2D) control1.clone());
this.control1 = (Point2D) control1.clone();
repaint();
}
public void setControl2(Point2D control2) {
support.firePropertyChange("control2",
(Point2D) this.control2.clone(),
(Point2D) control2.clone());
this.control2 = (Point2D) control2.clone();
repaint();
}
synchronized void saveAsTemplate(OutputStream out) {
BufferedImage image = Java2dHelper.createCompatibleImage(getWidth(), getHeight());
Graphics g = image.getGraphics();
isSaving = true;
setDrawText(false);
paint(g);
setDrawText(true);
isSaving = false;
g.dispose();
BufferedImage subImage = image.getSubimage((int) xPositionToPixel(0.0),
(int) yPositionToPixel(1.0),
(int) (xPositionToPixel(1.0) - xPositionToPixel(0.0)) + 1,
(int) (yPositionToPixel(0.0) - yPositionToPixel(1.0)) + 1);
try {
ImageIO.write(subImage, "PNG", out);
} catch (IOException e) {
}
image.flush();
subImage = null;
image = null;
}
@Override
protected void paintInformation(Graphics2D g2) {
if (!isSaving) {
paintControlPoints(g2);
}
paintSpline(g2);
}
private void paintControlPoints(Graphics2D g2) {
paintControlPoint(g2, control1);
paintControlPoint(g2, control2);
}
private void paintControlPoint(Graphics2D g2, Point2D control) {
double origin_x = xPositionToPixel(control.getX());
double origin_y = yPositionToPixel(control.getY());
double pos = control == control1 ? 0.0 : 1.0;
Ellipse2D outer = getDraggableArea(control);
Ellipse2D inner = new Ellipse2D.Double(origin_x + 2.0 - CONTROL_POINT_SIZE / 2.0,
origin_y + 2.0 - CONTROL_POINT_SIZE / 2.0,
8.0, 8.0);
Area circle = new Area(outer);
circle.subtract(new Area(inner));
Stroke stroke = g2.getStroke();
g2.setStroke(new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER,
5, new float[] { 5, 5 }, 0));
g2.setColor(new Color(1.0f, 0.0f, 0.0f, 0.4f));
g2.drawLine(0, (int) origin_y, (int) origin_x, (int) origin_y);
g2.drawLine((int) origin_x, (int) origin_y, (int) origin_x, getHeight());
g2.setStroke(stroke);
if (selected == control) {
g2.setColor(new Color(1.0f, 1.0f, 1.0f, 1.0f));
} else {
g2.setColor(new Color(0.8f, 0.8f, 0.8f, 0.6f));
}
g2.fill(inner);
g2.setColor(new Color(0.0f, 0.0f, 0.5f, 0.5f));
g2.fill(circle);
g2.drawLine((int) origin_x, (int) origin_y,
(int) xPositionToPixel(pos), (int) yPositionToPixel(pos));
}
private Ellipse2D getDraggableArea(Point2D control) {
Ellipse2D outer = new Ellipse2D.Double(xPositionToPixel(control.getX()) - CONTROL_POINT_SIZE / 2.0,
yPositionToPixel(control.getY()) - CONTROL_POINT_SIZE / 2.0,
CONTROL_POINT_SIZE, CONTROL_POINT_SIZE);
return outer;
}
private void paintSpline(Graphics2D g2) {
CubicCurve2D spline = new CubicCurve2D.Double(xPositionToPixel(0.0), yPositionToPixel(0.0),
xPositionToPixel(control1.getX()),
yPositionToPixel(control1.getY()),
xPositionToPixel(control2.getX()),
yPositionToPixel(control2.getY()),
xPositionToPixel(1.0), yPositionToPixel(1.0));
g2.setColor(new Color(0.0f, 0.3f, 0.0f, 1.0f));
g2.draw(spline);
}
private void resetSelection() {
Point2D oldSelected = selected;
selected = null;
if (oldSelected != null) {
Rectangle bounds = getDraggableArea(oldSelected).getBounds();
repaint(bounds.x, bounds.y, bounds.width, bounds.height);
}
}
private class ControlPointsHandler extends MouseMotionAdapter {
@Override
public void mouseMoved(MouseEvent e) {
Ellipse2D area1 = getDraggableArea(control1);
Ellipse2D area2 = getDraggableArea(control2);
if (area1.contains(e.getPoint()) || area2.contains(e.getPoint())) {
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
} else {
setCursor(Cursor.getDefaultCursor());
}
}
@Override
public void mouseDragged(MouseEvent e) {
if (selected == null) {
return;
}
Point dragEnd = e.getPoint();
double distance = xPixelToPosition(dragEnd.getX()) -
xPixelToPosition(dragStart.getX());
double x = selected.getX() + distance;
if (x < 0.0) {
x = 0.0;
} else if (x > 1.0) {
x = 1.0;
}
distance = yPixelToPosition(dragEnd.getY()) -
yPixelToPosition(dragStart.getY());
double y = selected.getY() + distance;
if (y < 0.0) {
y = 0.0;
} else if (y > 1.0) {
y = 1.0;
}
Point2D selectedCopy = (Point2D) selected.clone();
selected.setLocation(x, y);
support.firePropertyChange("control" + (selected == control1 ? "1" : "2"),
selectedCopy, (Point2D) selected.clone());
repaint();
double xPos = xPixelToPosition(dragEnd.getX());
double yPos = -yPixelToPosition(dragEnd.getY());
if (xPos >= 0.0 && xPos <= 1.0) {
dragStart.setLocation(dragEnd.getX(), dragStart.getY());
}
if (yPos >= 0.0 && yPos <= 1.0) {
dragStart.setLocation(dragStart.getX(), dragEnd.getY());
}
}
}
private class SelectionHandler extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
Ellipse2D area1 = getDraggableArea(control1);
Ellipse2D area2 = getDraggableArea(control2);
if (area1.contains(e.getPoint())) {
selected = control1;
dragStart = e.getPoint();
Rectangle bounds = area1.getBounds();
repaint(bounds.x, bounds.y, bounds.width, bounds.height);
} else if (area2.contains(e.getPoint())) {
selected = control2;
dragStart = e.getPoint();
Rectangle bounds = area2.getBounds();
repaint(bounds.x, bounds.y, bounds.width, bounds.height);
} else {
resetSelection();
}
}
@Override
public void mouseReleased(MouseEvent e) {
resetSelection();
}
}
}
</source>
Trace curve
<source lang="java">
/*************************************************************************
- *
- This source code file, and compiled classes derived from it, can *
- be used and distributed without restriction, including for commercial *
- use. (Attribution is not required but is appreciated.) *
- *
- David J. Eck *
- Department of Mathematics and Computer Science *
- Hobart and William Smith Colleges *
- Geneva, New York 14456, USA *
- Email: eck@hws.edu WWW: http://math.hws.edu/eck/ *
- *
- /
// The ParametricCurve applet is a configurable applet that displays a parametric // curve defined by two functions of a parameter t. There can be a "Tracer" button // on the applet. When the user clicks this button, a crosshair is moved along // the curve from beginning to end. import java.awt.*; import java.applet.Applet; import java.util.StringTokenizer; import java.util.Hashtable; import edu.hws.jcm.draw.*; import edu.hws.jcm.data.*; import edu.hws.jcm.functions.*; import edu.hws.jcm.awt.*;
public class Parametric extends GenericGraphApplet {
// Declare some private variables that are created in one method in
// this class and used in a second method.
private Function xFunc,yFunc; // The functions that are graphed.
private ParametricCurve graph; // The graph of the function.
private Animator tracer; // for tracing the curve by moving a crosshair along it
private Crosshair crosshair; // Crosshair used for tracing the graph
private VariableInput tMin,tMax; // for inputting limits on t
private VariableInput tIntervals; // for inutting the number of intervals into which the t-range is divided
private ExpressionInput functionInput2; // for inputting yFunc; xFunc is input in functionInput
protected void setUpParameterDefaults() {
parameterDefaults = new Hashtable();
parameterDefaults.put("TwoLimitsColumns", "yes");
parameterDefaults.put("Variable","t");
parameterDefaults.put("XName","x"); // we need this so that xmin and xmax boxes are labeled correctly;
// without it, the name would come from the variable name, t, instead of x
parameterDefaults.put("FunctionLabel", " " + getParameter("XName") + "(" + getParameter("Variable") + ") = ");
parameterDefaults.put("FunctionLabel2", " " + getParameter("YName","y") + "(" + getParameter("Variable") + ") = ");
}
protected void setUpCanvas() { // Override this to add more stuff to the canvas.
super.setUpCanvas(); // Do the common setup: Add the axes and
// When setUpCanvas is called, the function inputs already exist, if they are
// to be used, since they are created in setUpBopttomPanel(), which is called
// before setUpCanvas(). If functionInput exists, add a graph of the functions
// from functionInput and functionInput2 to the canvas. If not, create a graph
// of the functions specified by the parameters named "Function" and "Function2".
if (functionInput != null) {
xFunc = functionInput.getFunction(xVar);
yFunc = functionInput2.getFunction(xVar);
}
else {
String xFuncDef = " cos(" + xVar.getName() + ") + cos(3*" + xVar.getName() + ")";
String yFuncDef = " sin(4*" + xVar.getName() + ") - sin(2*" + xVar.getName() + ")";
xFuncDef = getParameter("Function", xFuncDef);
yFuncDef = getParameter("Function2", yFuncDef);
Function f = new SimpleFunction( parser.parse(xFuncDef), xVar );
xFunc = new WrapperFunction(f);
f = new SimpleFunction( parser.parse(yFuncDef), xVar );
yFunc = new WrapperFunction(f);
}
graph = new ParametricCurve(xFunc,yFunc);
Color color = getColorParam("CurveColor");
if (color != null)
graph.setColor(color);
// if inputs are desired to control the parameter on the curve, set them up here
if ("no".equalsIgnoreCase(getParameter("UseParamInputs","yes"))) {
tMin = new VariableInput(xVar.getName() + "Start",getParameter("ParameterMin","-2"));
tMax = new VariableInput(xVar.getName() + "End",getParameter("ParameterMax","2"));
tIntervals = new VariableInput("Intervals", getParameter("Intervals","200"));
tIntervals.setInputStyle(VariableInput.INTEGER);
tIntervals.setMin(1);
tIntervals.setMax(5000);
tMin.setOnUserAction(mainController);
tMax.setOnUserAction(mainController);
tIntervals.setOnUserAction(mainController);
graph.setTMin(tMin);
graph.setTMax(tMax);
graph.setIntervals(tIntervals);
if (limitsPanel != null) {
// componets will be added to limitsPanel in setUpLimitsPanel()
mainController.add(tMin); // This is not done automatically, since they are in a limits panel
mainController.add(tMax);
mainController.add(tIntervals);
}
else {
JCMPanel ap = new JCMPanel(9,0);
ap.setBackground(getColorParam("PanelBackground", Color.lightGray));
ap.add(new Label(tMin.getName()));
ap.add(tMin);
ap.add(new Label());
ap.add(new Label(tMax.getName()));
ap.add(tMax);
ap.add(new Label());
ap.add(new Label(tIntervals.getName()));
ap.add(tIntervals);
ap.add(new Label());
mainPanel.add(ap,BorderLayout.EAST);
}
}
else {
try {
graph.setTMin( new Constant((new Double(getParameter("ParameterMin","-2"))).doubleValue()) );
graph.setTMax( new Constant((new Double(getParameter("ParameterMax","2"))).doubleValue()) );
graph.setIntervals( new Constant((new Double(getParameter("Intervals","25"))).doubleValue()) );
}
catch (NumberFormatException e) {
}
}
// If the applet is configured to have a tracer button, create it and add the crosshair to the canvas
if (! "no".equalsIgnoreCase( getParameter("UseTracer","yes") ) ) {
tracer = new Animator();
tracer.setMin(graph.getTMin());
tracer.setMax(graph.getTMax());
tracer.setUndefinedWhenNotRunning(true);
tracer.setStartButtonName("Trace Curve!");
double[] d = getNumericParam("TracerIntervals");
int ints;
if (d == null || d.length != 1)
ints = 100;
else
ints = (int)Math.round(d[0]);
if (ints <= 0)
tracer.setIntervals(graph.getIntervals());
else
tracer.setIntervals(ints);
Variable v = tracer.getValueAsVariable();
crosshair = new Crosshair( new ValueMath(xFunc,v), new ValueMath(yFunc,v) );
crosshair.setLineWidth(3);
crosshair.setColor(getColorParam("CrosshairColor",Color.gray));
canvas.add(crosshair);
if (inputPanel != null) {
inputPanel.add(tracer,BorderLayout.WEST);
}
else if (limitsPanel == null) {
Panel p = new Panel();
p.add(tracer);
mainPanel.add(p,BorderLayout.SOUTH);
}
// if inputPanel is null but limitsPanel is not null, the tracer will be
// added to the limit control panel in setUpLimitsPanel()
}
canvas.add(graph); // Finally, add the graph to the canvas.
} // end setUpCanvas()
protected void setUpLimitsPanel() {
super.setUpLimitsPanel();
if (limitsPanel != null && tMin != null) { // add parameter inputs to limits panel
limitsPanel.addComponentPair(tMin,tMax);
limitsPanel.addComponent(tIntervals);
}
if (inputPanel == null && tracer != null && limitsPanel != null) {
limitsPanel.addComponent(tracer);
}
}
protected void setUpBottomPanel() { // override this to make a panel containing inputs for two functions
if ( ! "no".equalsIgnoreCase(getParameter("UseFunctionInput", "yes")) ) {
inputPanel = new JCMPanel();
inputPanel.setBackground( getColorParam("PanelBackground", Color.lightGray) );
Panel in = new JCMPanel(2,1);
inputPanel.add(in,BorderLayout.CENTER);
if ( ! "no".equalsIgnoreCase(getParameter("UseComputeButton", "yes")) ) {
String cname = getParameter("ComputeButtonName", "New Functions");
computeButton = new Button(cname);
inputPanel.add(computeButton, BorderLayout.EAST);
computeButton.addActionListener(this);
}
String varName = getParameter("Variable");
String def = getParameter("Function");
if (def == null)
def = "cos(" + varName + ") + cos(3*" + varName + ")";
functionInput = new ExpressionInput(def,parser);
String label = getParameter("FunctionLabel");
if ("none".equalsIgnoreCase(label))
in.add(functionInput);
else {
Panel p = new JCMPanel();
p.add(functionInput,BorderLayout.CENTER);
p.add( new Label(label), BorderLayout.WEST );
in.add(p);
}
def = getParameter("Function2");
if (def == null)
def = "sin(4*" + varName + ") - sin(2*" + varName + ")";
functionInput2 = new ExpressionInput(def,parser);
label = getParameter("FunctionLabel2");
if ("none".equalsIgnoreCase(label))
in.add(functionInput2);
else {
Panel p = new JCMPanel();
p.add(functionInput2,BorderLayout.CENTER);
p.add( new Label(label), BorderLayout.WEST );
in.add(p);
}
mainPanel.add(inputPanel, BorderLayout.SOUTH);
functionInput.setOnUserAction(mainController);
functionInput2.setOnUserAction(mainController);
}
}
protected void setUpMainPanel() { // Override to set up controller for tracer, if there is one
super.setUpMainPanel(); // Do the common setup
if ( tracer == null ) {
return; // If the applet is not configured to use a trace button, there is nothing to do.
}
Controller traceController = new Controller(); // A controler that will only recompute the crosshair position
traceController.add(tracer);
traceController.add(crosshair);
tracer.setOnChange(traceController);
} // end setUpMainPanel()
protected void doLoadExample(String example) {
// This method is called when the user loads an example from the
// example menu (if there is one). It overrides an empty method
// in GenericGraphApplet.
// For the Parametric applet, the example string should contain
// two expression that defines the curve to be graphed, separated
// by a semicolon. This can optionally
// be followed by another semicolon and a list of four to seven numbers.
// The first four numbers give the x- and y-limits to be used for the
// example. If they are not present, then -5,5,-5,5 is used. The
// next three numbers specify the minimum value for the parameter, the
// maximum value, and the number of intervals into which the range of
// parameter values is divided.
if (tracer != null)
tracer.stop();
int pos = example.indexOf(";");
if (pos == -1)
return; // illegal example -- must have two functions
String example2 = example.substring(pos+1);
example = example.substring(0,pos);
pos = example2.indexOf(";");
double[] limits = { -5,5,-5,5 }; // x- and y-limits to use
if (pos > 0) {
// Get limits from example2 text.
String nums = example2.substring(pos+1);
example2 = example2.substring(0,pos);
StringTokenizer toks = new StringTokenizer(nums, " ,");
if (toks.countTokens() >= 4) {
for (int i = 0; i < 4; i++) {
try {
Double d = new Double(toks.nextToken());
limits[i] = d.doubleValue();
}
catch (NumberFormatException e) {
}
}
}
if (toks.hasMoreTokens()) {
try {
double d = (new Double(toks.nextToken())).doubleValue();
if (tMin == null) {
graph.setTMin(new Constant(d));
if (tracer != null)
tracer.setMin(d);
}
else
tMin.setVal(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
double d = (new Double(toks.nextToken())).doubleValue();
if (tMax == null) {
graph.setTMax(new Constant(d));
if (tracer != null)
tracer.setMax(d);
}
else
tMax.setVal(d);
}
catch (NumberFormatException e) {
}
}
if (toks.hasMoreTokens()) {
try {
int d = (int)Math.round((new Double(toks.nextToken())).doubleValue());
if (tIntervals == null) {
if (tracer != null && tracer.getIntervals() == graph.getIntervals())
tracer.setIntervals(d);
graph.setIntervals(new Constant(d));
}
else
tIntervals.setVal(d);
}
catch (NumberFormatException e) {
}
}
}
// Set up the example data and recompute everything.
if (functionInput != null) {
// If there is a function input box, put the example text in it.
functionInput.setText(example);
functionInput2.setText(example2);
}
else {
// If there is no user input, set the function in the graph directly.
try {
Function f = new SimpleFunction( parser.parse(example), xVar );
((WrapperFunction)xFunc).setFunction(f);
Function g = new SimpleFunction( parser.parse(example2), xVar );
((WrapperFunction)yFunc).setFunction(g);
}
catch (ParseError e) {
// There should"t be parse error"s in the Web-page
// author"s examples! If there are, the function
// just won"t change.
}
}
CoordinateRect coords = canvas.getCoordinateRect(0);
coords.setLimits(limits);
coords.setRestoreBuffer();
mainController.rupute();
} // end doLoadExample()
public void stop() { // stop animator when applet is stopped
if (tracer != null)
tracer.stop();
super.stop();
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new Parametric();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
} // end class Parametric
</source>
Zoom interaction, Text background color, and the effect of transparency
<source lang="java">
import java.awt.*; import javax.swing.*; import no.geosoft.cc.graphics.*;
/**
* G demo program. Demonstrates: **
-
*
- Custom world extent *
- Zoom interaction *
- Text background color *
- The effect of transparency *
- Annotation layout algorithm *
* * @author
