Java by API/javax.microedition.lcdui/Canvas
Содержание
Canvas.DOWN
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; public class Navigate2MIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Displayable nd;
Image image = null;
public Navigate2MIDlet() {
try {
image = Image.createImage("/J.png");
} catch (Exception e) {
}
Display display = Display.getDisplay(this);
nd = new Navigate2Canvas(image);
exitCommand = new Command("exit", Command.EXIT, 1);
nd.addCommand(exitCommand);
nd.setCommandListener(this);
display.setCurrent(nd);
}
public void startApp() {
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class Navigate2Canvas extends Canvas {
private Image image;
private int newX = 0;
private int newY = 0;
private int stepX = 0;
private int stepY = 0;
public Navigate2Canvas(Image image) {
this.image = image;
newX = 0;
newY = 0;
stepX = getWidth() / 4;
stepY = getHeight() / 4;
}
public void steppingXY(int x, int y) {
newX += x;
newY += y;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.translate(newX, newY);
g.drawImage(image, 0, 0, g.TOP | g.LEFT);
}
protected void keyPressed(int keyCode) {
int gameaction = getGameAction(keyCode);
switch (gameaction) {
case UP:
steppingXY(0, stepY);
break;
case DOWN:
steppingXY(0, -stepY);
break;
case LEFT:
steppingXY(stepX, 0);
break;
case RIGHT:
steppingXY(-stepX, 0);
break;
}
repaint();
}
}
</source>
Canvas.FIRE
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class GameActionMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Display display;
Displayable d;
public void startApp() {
Display display = Display.getDisplay(this);
d = new GameActionCanvas();
exitCommand = new Command("Exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class GameActionCanvas extends Canvas {
int width = 0;
int height = 0;
String aMessage = "message";
public void paint(Graphics g) {
width = getWidth();
height = getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.drawString(aMessage, 10, 10, Graphics.TOP | Graphics.LEFT);
}
protected void keyPressed(int keyCode) {
int gameAction = getGameAction(keyCode);
switch (gameAction) {
case UP:
aMessage = "Up";
break;
case DOWN:
aMessage = "Down";
break;
case LEFT:
aMessage = "Left";
break;
case RIGHT:
aMessage = "Right";
break;
case FIRE:
aMessage = "Send";
break;
case GAME_A:
aMessage = "GAME_A";
break;
case GAME_B:
aMessage = "GAME_B";
break;
case GAME_C:
aMessage = "GAME_C";
break;
case GAME_D:
aMessage = "GAME_D";
break;
default:
aMessage = "";
break;
}
repaint();
}
}
</source>
Canvas.GAME_D
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class GameActionMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Display display;
Displayable d;
public void startApp() {
Display display = Display.getDisplay(this);
d = new GameActionCanvas();
exitCommand = new Command("Exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class GameActionCanvas extends Canvas {
int width = 0;
int height = 0;
String aMessage = "message";
public void paint(Graphics g) {
width = getWidth();
height = getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.drawString(aMessage, 10, 10, Graphics.TOP | Graphics.LEFT);
}
protected void keyPressed(int keyCode) {
int gameAction = getGameAction(keyCode);
switch (gameAction) {
case UP:
aMessage = "Up";
break;
case DOWN:
aMessage = "Down";
break;
case LEFT:
aMessage = "Left";
break;
case RIGHT:
aMessage = "Right";
break;
case FIRE:
aMessage = "Send";
break;
case GAME_A:
aMessage = "GAME_A";
break;
case GAME_B:
aMessage = "GAME_B";
break;
case GAME_C:
aMessage = "GAME_C";
break;
case GAME_D:
aMessage = "GAME_D";
break;
default:
aMessage = "";
break;
}
repaint();
}
}
</source>
Canvas: getKeyName(int keyCode)
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class KeyEventsMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Display display;
Displayable d;
public void startApp() {
Display display = Display.getDisplay(this);
d = new KeyEventsCanvas();
exitCommand = new Command("Exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class KeyEventsCanvas extends Canvas {
int width = 0;
int height = 0;
String aMessage = "message";
public void paint(Graphics g) {
width = getWidth();
height = getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.drawString(aMessage, 10, 10, Graphics.TOP | Graphics.LEFT);
}
protected void keyPressed(int keyCode) {
aMessage = getKeyName(keyCode);
if (aMessage.equals("2"))
aMessage = "2";
repaint();
}
}
</source>
Canvas.getWidth()
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.StringItem; import javax.microedition.midlet.MIDlet; public class AttributesMIDlet extends MIDlet
implements CommandListener {
private Display display;
protected boolean started;
private Command exitCommand;
protected void startApp() {
if (!started) {
display = Display.getDisplay(this);
Canvas canvas = new DummyCanvas();
Form form = new Form("Attributes");
exitCommand = new Command("Exit", Command.EXIT, 0);
form.addCommand(exitCommand);
boolean isColor = display.isColor();
form.append(new StringItem(isColor ? "Colors: " : "Grays: ",
String.valueOf(display.numColors())));
form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth())));
form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight())));
form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents())));
form.append(new StringItem("Motion? ",String.valueOf(canvas.hasPointerMotionEvents())));
form.append(new StringItem("Repeat? ",String.valueOf(canvas.hasRepeatEvents())));
form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered())));
form.setCommandListener(this);
display.setCurrent(form);
started = true;
}
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
if (c == exitCommand) {
notifyDestroyed();
}
}
static class DummyCanvas extends Canvas {
protected void paint(Graphics g) {
}
}
}
</source>
Canvas.hasPointerEvents()
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.StringItem; import javax.microedition.midlet.MIDlet; public class AttributesMIDlet extends MIDlet
implements CommandListener {
private Display display;
protected boolean started;
private Command exitCommand;
protected void startApp() {
if (!started) {
display = Display.getDisplay(this);
Canvas canvas = new DummyCanvas();
Form form = new Form("Attributes");
exitCommand = new Command("Exit", Command.EXIT, 0);
form.addCommand(exitCommand);
boolean isColor = display.isColor();
form.append(new StringItem(isColor ? "Colors: " : "Grays: ",
String.valueOf(display.numColors())));
form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth())));
form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight())));
form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents())));
form.append(new StringItem("Motion? ",String.valueOf(canvas.hasPointerMotionEvents())));
form.append(new StringItem("Repeat? ",String.valueOf(canvas.hasRepeatEvents())));
form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered())));
form.setCommandListener(this);
display.setCurrent(form);
started = true;
}
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
if (c == exitCommand) {
notifyDestroyed();
}
}
static class DummyCanvas extends Canvas {
protected void paint(Graphics g) {
}
}
}
</source>
Canvas.hasRepeatEvents()
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.StringItem; import javax.microedition.midlet.MIDlet; public class AttributesMIDlet extends MIDlet
implements CommandListener {
private Display display;
protected boolean started;
private Command exitCommand;
protected void startApp() {
if (!started) {
display = Display.getDisplay(this);
Canvas canvas = new DummyCanvas();
Form form = new Form("Attributes");
exitCommand = new Command("Exit", Command.EXIT, 0);
form.addCommand(exitCommand);
boolean isColor = display.isColor();
form.append(new StringItem(isColor ? "Colors: " : "Grays: ",
String.valueOf(display.numColors())));
form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth())));
form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight())));
form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents())));
form.append(new StringItem("Motion? ",String.valueOf(canvas.hasPointerMotionEvents())));
form.append(new StringItem("Repeat? ",String.valueOf(canvas.hasRepeatEvents())));
form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered())));
form.setCommandListener(this);
display.setCurrent(form);
started = true;
}
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
if (c == exitCommand) {
notifyDestroyed();
}
}
static class DummyCanvas extends Canvas {
protected void paint(Graphics g) {
}
}
}
</source>
Canvas.LEFT
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; public class Navigate2MIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Displayable nd;
Image image = null;
public Navigate2MIDlet() {
try {
image = Image.createImage("/J.png");
} catch (Exception e) {
}
Display display = Display.getDisplay(this);
nd = new Navigate2Canvas(image);
exitCommand = new Command("exit", Command.EXIT, 1);
nd.addCommand(exitCommand);
nd.setCommandListener(this);
display.setCurrent(nd);
}
public void startApp() {
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class Navigate2Canvas extends Canvas {
private Image image;
private int newX = 0;
private int newY = 0;
private int stepX = 0;
private int stepY = 0;
public Navigate2Canvas(Image image) {
this.image = image;
newX = 0;
newY = 0;
stepX = getWidth() / 4;
stepY = getHeight() / 4;
}
public void steppingXY(int x, int y) {
newX += x;
newY += y;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.translate(newX, newY);
g.drawImage(image, 0, 0, g.TOP | g.LEFT);
}
protected void keyPressed(int keyCode) {
int gameaction = getGameAction(keyCode);
switch (gameaction) {
case UP:
steppingXY(0, stepY);
break;
case DOWN:
steppingXY(0, -stepY);
break;
case LEFT:
steppingXY(stepX, 0);
break;
case RIGHT:
steppingXY(-stepX, 0);
break;
}
repaint();
}
}
</source>
Canvas.RIGHT
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; public class Navigate2MIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Displayable nd;
Image image = null;
public Navigate2MIDlet() {
try {
image = Image.createImage("/J.png");
} catch (Exception e) {
}
Display display = Display.getDisplay(this);
nd = new Navigate2Canvas(image);
exitCommand = new Command("exit", Command.EXIT, 1);
nd.addCommand(exitCommand);
nd.setCommandListener(this);
display.setCurrent(nd);
}
public void startApp() {
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class Navigate2Canvas extends Canvas {
private Image image;
private int newX = 0;
private int newY = 0;
private int stepX = 0;
private int stepY = 0;
public Navigate2Canvas(Image image) {
this.image = image;
newX = 0;
newY = 0;
stepX = getWidth() / 4;
stepY = getHeight() / 4;
}
public void steppingXY(int x, int y) {
newX += x;
newY += y;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.translate(newX, newY);
g.drawImage(image, 0, 0, g.TOP | g.LEFT);
}
protected void keyPressed(int keyCode) {
int gameaction = getGameAction(keyCode);
switch (gameaction) {
case UP:
steppingXY(0, stepY);
break;
case DOWN:
steppingXY(0, -stepY);
break;
case LEFT:
steppingXY(stepX, 0);
break;
case RIGHT:
steppingXY(-stepX, 0);
break;
}
repaint();
}
}
</source>
Canvas.setCommandListener(CommandListener l)
<source lang="java">
/* License
*
* Copyright 1994-2004 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:
*
* * Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistribution 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 Sun Microsystems, Inc. or the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class EventEx3 extends MIDlet {
Display display;
Command exit;
public EventEx3() {
display = Display.getDisplay(this);
}
public void destroyApp(boolean unconditional) {
}
public void pauseApp() {
System.out.println("App paused.");
}
public void startApp() {
display = Display.getDisplay(this);
Canvas canvas = new Canvas() { // anonymous class
public void paint(Graphics g) {
}
protected void keyPressed(int keyCode) {
if (keyCode > 0) {
System.out.println("keyPressed " + ((char) keyCode));
} else {
System.out.println("keyPressed action " + getGameAction(keyCode));
}
}
protected void keyReleased(int keyCode) {
if (keyCode > 0) {
System.out.println("keyReleased " + ((char) keyCode));
} else {
System.out.println("keyReleased action " + getGameAction(keyCode));
}
}
}; // end of anonymous class
exit = new Command("Exit", Command.STOP, 1);
canvas.addCommand(exit);
canvas.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable d) {
if (c == exit) {
notifyDestroyed();
} else {
System.out.println("Saw the command: " + c);
}
}
});
display.setCurrent(canvas);
}
}
</source>
Canvas.UP
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; public class Navigate2MIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Displayable nd;
Image image = null;
public Navigate2MIDlet() {
try {
image = Image.createImage("/J.png");
} catch (Exception e) {
}
Display display = Display.getDisplay(this);
nd = new Navigate2Canvas(image);
exitCommand = new Command("exit", Command.EXIT, 1);
nd.addCommand(exitCommand);
nd.setCommandListener(this);
display.setCurrent(nd);
}
public void startApp() {
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class Navigate2Canvas extends Canvas {
private Image image;
private int newX = 0;
private int newY = 0;
private int stepX = 0;
private int stepY = 0;
public Navigate2Canvas(Image image) {
this.image = image;
newX = 0;
newY = 0;
stepX = getWidth() / 4;
stepY = getHeight() / 4;
}
public void steppingXY(int x, int y) {
newX += x;
newY += y;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.translate(newX, newY);
g.drawImage(image, 0, 0, g.TOP | g.LEFT);
}
protected void keyPressed(int keyCode) {
int gameaction = getGameAction(keyCode);
switch (gameaction) {
case UP:
steppingXY(0, stepY);
break;
case DOWN:
steppingXY(0, -stepY);
break;
case LEFT:
steppingXY(stepX, 0);
break;
case RIGHT:
steppingXY(-stepX, 0);
break;
}
repaint();
}
}
</source>
extends Canvas
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class TextAnchorMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Display display;
public void startApp() {
Display display = Display.getDisplay(this);
Displayable d = new TextAnchorCanvas();
exitCommand = new Command("exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class TextAnchorCanvas extends Canvas {
int width = 0;
int height = 0;
public void paint(Graphics g) {
width = getWidth();
height = getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.drawString("TEXT", width / 2, height / 2, Graphics.BASELINE | Graphics.HCENTER);
}
}
</source>
