Java/2D Graphics GUI/Composite
Содержание
- 1 AlphaComposite
- 2 AlphaComposite.DST
- 3 AlphaComposite.DST_ATOP
- 4 AlphaComposite.DST_OUT
- 5 AlphaComposite.SRC
- 6 AlphaComposite.SRC_ATOP
- 7 AlphaComposite.SRC_OUT
- 8 Blend Composite Demo
- 9 Blending Modes
- 10 Opacity
- 11 Creating a Blend Composite
- 12 Implementation Caveat
- 13 Compatible Images
- 14 Creating Thumbnails
- 15 Image Manipulation
- 16 Composite demo
- 17 Composite Effects
AlphaComposite
<source lang="java"> import java.awt.AlphaComposite; import java.awt.BorderLayout; import java.awt.Color; import java.awt.ruponent; import java.awt.Container; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.geom.Ellipse2D; import java.awt.image.BufferedImage; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class AlphaCompositeDemo extends JFrame {
MyCanvas canvas;
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 5);
JComboBox rulesBox;
String[] rulesLabels = { "Clear", "Source", "Source-over",
"Destination-over", "Source-in", "Destination-in", "Source-out",
"Destination-out" };
int[] rules = { AlphaComposite.CLEAR, AlphaComposite.SRC,
AlphaComposite.SRC_OVER, AlphaComposite.DST_OVER,
AlphaComposite.SRC_IN, AlphaComposite.DST_IN,
AlphaComposite.SRC_OUT, AlphaComposite.DST_OUT };
public AlphaCompositeDemo() {
super();
Container container = getContentPane();
canvas = new MyCanvas();
container.add(canvas);
rulesBox = new JComboBox(rulesLabels);
rulesBox.setSelectedIndex(0);
rulesBox.setAlignmentX(Component.LEFT_ALIGNMENT);
rulesBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JComboBox cb = (JComboBox) e.getSource();
canvas.rupositeRule = rules[cb.getSelectedIndex()];
canvas.repaint();
}
});
slider.setPaintTicks(true);
slider.setMajorTickSpacing(25);
slider.setMinorTickSpacing(25);
slider.setPaintLabels(true);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
JSlider slider = (JSlider) e.getSource();
canvas.alphaValue = (float) slider.getValue() / 100;
canvas.repaint();
}
});
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 3));
panel.add(rulesBox);
panel.add(new JLabel("Alpha Adjustment x E-2: ", JLabel.RIGHT));
panel.add(slider);
container.add(panel, BorderLayout.SOUTH);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setSize(500,300);
setVisible(true);
}
public static void main(String arg[]) {
new AlphaCompositeDemo();
}
class MyCanvas extends JLabel {
float alphaValue = 1.0f;
int compositeRule = AlphaComposite.CLEAR;
AlphaComposite ac;
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
int w = getSize().width;
int h = getSize().height;
BufferedImage bi = new BufferedImage(w, h,
BufferedImage.TYPE_INT_ARGB);
Graphics2D big = bi.createGraphics();
ac = AlphaComposite.getInstance(compositeRule, alphaValue);
big.setColor(Color.red);
big.drawString("Destination", w / 4, h / 4);
big.fill(new Ellipse2D.Double(0, h / 3, 2 * w / 3, h / 3));
big.setColor(Color.blue);
big.drawString("Source", 3 * w / 4, h / 4);
big.setComposite(ac);
big.fill(new Ellipse2D.Double(w / 3, h / 3, 2 * w / 3, h / 3));
g2D.drawImage(bi, null, 0, 0);
}
}
}
</source>
AlphaComposite.DST
<source lang="java"> import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
AlphaComposite.DST_ATOP
<source lang="java"> import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST_ATOP extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST_ATOP, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST_ATOP());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
AlphaComposite.DST_OUT
<source lang="java">
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST_ATOP extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST_OUT, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST_ATOP());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
AlphaComposite.SRC
<source lang="java">
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST_ATOP extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST_ATOP());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
AlphaComposite.SRC_ATOP
<source lang="java">
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST_ATOP extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST_ATOP());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
AlphaComposite.SRC_OUT
<source lang="java">
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST_ATOP extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OUT, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new CompositingDST_ATOP());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
</source>
Blend Composite Demo
<source lang="java">
import java.awt.AlphaComposite; import java.awt.BorderLayout; import java.awt.Color; import java.awt.ruposite; import java.awt.rupositeContext; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GraphicsConfiguration; import java.awt.GraphicsEnvironment; import java.awt.RenderingHints; import java.awt.Transparency; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.DataBuffer; import java.awt.image.DirectColorModel; import java.awt.image.Raster; import java.awt.image.RasterFormatException; import java.awt.image.WritableRaster; import java.io.IOException; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.SwingUtilities; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener;
/**
* See {@link org.jdesktop.swingx.graphics.BlendComposite}.
*
* @author Romain Guy <romain.guy@mac.ru>
*/
public class BlendCompositeDemo extends JFrame {
private CompositeTestPanel compositeTestPanel;
private JComboBox combo;
private JSlider slider;
public BlendCompositeDemo() {
super("Blend Composites");
compositeTestPanel = new CompositeTestPanel();
compositeTestPanel.setComposite(BlendComposite.Average);
add(compositeTestPanel);
combo = new JComboBox(BlendComposite.BlendingMode.values());
combo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
compositeTestPanel.setComposite(
BlendComposite.getInstance(
BlendComposite.BlendingMode.valueOf(combo.getSelectedItem().toString()),
slider.getValue() / 100.0f
));
}
});
slider = new JSlider(0, 100, 100);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
BlendComposite blend = (BlendComposite) compositeTestPanel.getComposite();
blend = blend.derive(slider.getValue() / 100.0f);
compositeTestPanel.setComposite(blend);
}
});
JPanel controls = new JPanel(new FlowLayout(FlowLayout.LEFT));
controls.add(combo);
controls.add(new JLabel("0%"));
controls.add(slider);
controls.add(new JLabel("100%"));
add(controls, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private static class CompositeTestPanel extends JPanel {
private BufferedImage image = null;
private Composite composite = AlphaComposite.Src;
private BufferedImage imageA;
private BufferedImage imageB;
private boolean repaint = false;
public CompositeTestPanel() {
setOpaque(false);
try {
imageA = GraphicsUtilities.loadCompatibleImage(getClass().getResource("A.jpg"));
imageB = GraphicsUtilities.loadCompatibleImage(getClass().getResource("B.jpg"));
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(imageA.getWidth(), imageA.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
if (image == null) {
image = new BufferedImage(imageA.getWidth(),
imageA.getHeight(),
BufferedImage.TYPE_INT_ARGB);
repaint = true;
}
if (repaint) {
Graphics2D g2 = image.createGraphics();
g2.setComposite(AlphaComposite.Clear);
g2.fillRect(0, 0, image.getWidth(), image.getHeight());
g2.setComposite(AlphaComposite.Src);
g2.drawImage(imageA, 0, 0, null);
g2.setComposite(getComposite());
g2.drawImage(imageB, 0, 0, null);
g2.dispose();
repaint = false;
}
int x = (getWidth() - image.getWidth()) / 2;
int y = (getHeight() - image.getHeight()) / 2;
g.drawImage(image, x, y, null);
}
public void setComposite(Composite composite) {
if (composite != null) {
this.ruposite = composite;
this.repaint = true;
repaint();
}
}
public Composite getComposite() {
return this.ruposite;
}
}
public static void main(String... args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new BlendCompositeDemo().setVisible(true);
}
});
}
}
/*
* $Id: BlendComposite.java,v 1.9 2007/02/28 01:21:29 gfx Exp $ * * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy). * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.ru> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 blend composite defines the rule according to which a drawing primitive * (known as the source) is mixed with existing graphics (know as the * destination.)
*BlendComposite is an implementation of the
* {@link java.awt.ruposite} interface and must therefore be set as a state on
* a {@link java.awt.Graphics2D} surface.
Please refer to {@link java.awt.Graphics2D#setComposite(java.awt.ruposite)} * for more information on how to use this class with a graphics surface.
*Blending Modes
*This class offers a certain number of blending modes, or compositing * rules. These rules are inspired from graphics editing software packages, * like Adobe Photoshop or The GIMP.
*Given the wide variety of implemented blending modes and the difficulty * to describe them with words, please refer to those tools to visually see * the result of these blending modes.
*Opacity
*Each blending mode has an associated opacity, defined as a float value * between 0.0 and 1.0. Changing the opacity controls the force with which the * compositing operation is applied. For instance, a composite with an opacity * of 0.0 will not draw the source onto the destination. With an opacity of * 1.0, the source will be fully drawn onto the destination, according to the * selected blending mode rule.
*The opacity, or alpha value, is used by the composite instance to mutiply * the alpha value of each pixel of the source when being composited over the * destination.
*Creating a Blend Composite
*Blend composites can be created in various manners:
*-
*
- Use one of the pre-defined instance. Example:
*
BlendComposite.Average.
* - Derive one of the pre-defined instances by calling
* {@link #derive(float)} or {@link #derive(BlendingMode)}. Deriving allows
* you to change either the opacity or the blending mode. Example:
*
BlendComposite.Average.derive(0.5f).
* - Use a factory method: {@link #getInstance(BlendingMode)} or * {@link #getInstance(BlendingMode, float)}. *
Implementation Caveat
*TThe blending mode SoftLight has not been implemented yet.
*
* @see java.awt.Graphics2D
* @see java.awt.ruposite
* @see java.awt.AlphaComposite
* @author Romain Guy <romain.guy@mac.ru>
*/
final class BlendComposite implements Composite {
/**
* A blending mode defines the compositing rule of a * {@link BlendComposite}.
*
* @author Romain Guy <romain.guy@mac.ru>
*/
public enum BlendingMode {
AVERAGE,
MULTIPLY,
SCREEN,
DARKEN,
LIGHTEN,
OVERLAY,
HARD_LIGHT,
SOFT_LIGHT,
DIFFERENCE,
NEGATION,
EXCLUSION,
COLOR_DODGE,
INVERSE_COLOR_DODGE,
SOFT_DODGE,
COLOR_BURN,
INVERSE_COLOR_BURN,
SOFT_BURN,
REFLECT,
GLOW,
FREEZE,
HEAT,
ADD,
SUBTRACT,
STAMP,
RED,
GREEN,
BLUE,
HUE,
SATURATION,
COLOR,
LUMINOSITY
}
public static final BlendComposite Average = new BlendComposite(BlendingMode.AVERAGE);
public static final BlendComposite Multiply = new BlendComposite(BlendingMode.MULTIPLY);
public static final BlendComposite Screen = new BlendComposite(BlendingMode.SCREEN);
public static final BlendComposite Darken = new BlendComposite(BlendingMode.DARKEN);
public static final BlendComposite Lighten = new BlendComposite(BlendingMode.LIGHTEN);
public static final BlendComposite Overlay = new BlendComposite(BlendingMode.OVERLAY);
public static final BlendComposite HardLight = new BlendComposite(BlendingMode.HARD_LIGHT);
public static final BlendComposite SoftLight = new BlendComposite(BlendingMode.SOFT_LIGHT);
public static final BlendComposite Difference = new BlendComposite(BlendingMode.DIFFERENCE);
public static final BlendComposite Negation = new BlendComposite(BlendingMode.NEGATION);
public static final BlendComposite Exclusion = new BlendComposite(BlendingMode.EXCLUSION);
public static final BlendComposite ColorDodge = new BlendComposite(BlendingMode.COLOR_DODGE);
public static final BlendComposite InverseColorDodge = new BlendComposite(BlendingMode.INVERSE_COLOR_DODGE);
public static final BlendComposite SoftDodge = new BlendComposite(BlendingMode.SOFT_DODGE);
public static final BlendComposite ColorBurn = new BlendComposite(BlendingMode.COLOR_BURN);
public static final BlendComposite InverseColorBurn = new BlendComposite(BlendingMode.INVERSE_COLOR_BURN);
public static final BlendComposite SoftBurn = new BlendComposite(BlendingMode.SOFT_BURN);
public static final BlendComposite Reflect = new BlendComposite(BlendingMode.REFLECT);
public static final BlendComposite Glow = new BlendComposite(BlendingMode.GLOW);
public static final BlendComposite Freeze = new BlendComposite(BlendingMode.FREEZE);
public static final BlendComposite Heat = new BlendComposite(BlendingMode.HEAT);
public static final BlendComposite Add = new BlendComposite(BlendingMode.ADD);
public static final BlendComposite Subtract = new BlendComposite(BlendingMode.SUBTRACT);
public static final BlendComposite Stamp = new BlendComposite(BlendingMode.STAMP);
public static final BlendComposite Red = new BlendComposite(BlendingMode.RED);
public static final BlendComposite Green = new BlendComposite(BlendingMode.GREEN);
public static final BlendComposite Blue = new BlendComposite(BlendingMode.BLUE);
public static final BlendComposite Hue = new BlendComposite(BlendingMode.HUE);
public static final BlendComposite Saturation = new BlendComposite(BlendingMode.SATURATION);
public static final BlendComposite Color = new BlendComposite(BlendingMode.COLOR);
public static final BlendComposite Luminosity = new BlendComposite(BlendingMode.LUMINOSITY);
private final float alpha;
private final BlendingMode mode;
private BlendComposite(BlendingMode mode) {
this(mode, 1.0f);
}
private BlendComposite(BlendingMode mode, float alpha) {
this.mode = mode;
if (alpha < 0.0f || alpha > 1.0f) {
throw new IllegalArgumentException(
"alpha must be comprised between 0.0f and 1.0f");
}
this.alpha = alpha;
}
/**
* Creates a new composite based on the blending mode passed * as a parameter. A default opacity of 1.0 is applied.
*
* @param mode the blending mode defining the compositing rule
* @return a new BlendComposite based on the selected blending
* mode, with an opacity of 1.0
*/
public static BlendComposite getInstance(BlendingMode mode) {
return new BlendComposite(mode);
}
/**
* Creates a new composite based on the blending mode and opacity passed * as parameters. The opacity must be a value between 0.0 and 1.0.
*
* @param mode the blending mode defining the compositing rule
* @param alpha the constant alpha to be multiplied with the alpha of the
* source. alpha must be a floating point between 0.0 and 1.0.
* @throws IllegalArgumentException if the opacity is less than 0.0 or
* greater than 1.0
* @return a new BlendComposite based on the selected blending
* mode and opacity
*/
public static BlendComposite getInstance(BlendingMode mode, float alpha) {
return new BlendComposite(mode, alpha);
}
/**
* Returns a BlendComposite object that uses the specified
* blending mode and this object"s alpha value. If the newly specified
* blending mode is the same as this object"s, this object is returned.
*
* @param mode the blending mode defining the compositing rule
* @return a BlendComposite object derived from this object,
* that uses the specified blending mode
*/
public BlendComposite derive(BlendingMode mode) {
return this.mode == mode ? this : new BlendComposite(mode, getAlpha());
}
/**
* Returns a BlendComposite object that uses the specified
* opacity, or alpha, and this object"s blending mode. If the newly specified
* opacity is the same as this object"s, this object is returned.
*
* @param alpha the constant alpha to be multiplied with the alpha of the
* source. alpha must be a floating point between 0.0 and 1.0.
* @throws IllegalArgumentException if the opacity is less than 0.0 or
* greater than 1.0
* @return a BlendComposite object derived from this object,
* that uses the specified blending mode
*/
public BlendComposite derive(float alpha) {
return this.alpha == alpha ? this : new BlendComposite(getMode(), alpha);
}
/**
* Returns the opacity of this composite. If no opacity has been defined, * 1.0 is returned.
*
* @return the alpha value, or opacity, of this object
*/
public float getAlpha() {
return alpha;
}
/**
* Returns the blending mode of this composite.
*
* @return the blending mode used by this object
*/
public BlendingMode getMode() {
return mode;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return Float.floatToIntBits(alpha) * 31 + mode.ordinal();
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof BlendComposite)) {
return false;
}
BlendComposite bc = (BlendComposite) obj;
return mode == bc.mode && alpha == bc.alpha;
}
private static boolean checkComponentsOrder(ColorModel cm) {
if (cm instanceof DirectColorModel &&
cm.getTransferType() == DataBuffer.TYPE_INT) {
DirectColorModel directCM = (DirectColorModel) cm;
return directCM.getRedMask() == 0x00FF0000 &&
directCM.getGreenMask() == 0x0000FF00 &&
directCM.getBlueMask() == 0x000000FF &&
(directCM.getNumComponents() != 4 ||
directCM.getAlphaMask() == 0xFF000000);
}
return false;
}
/**
* {@inheritDoc}
*/
public CompositeContext createContext(ColorModel srcColorModel,
ColorModel dstColorModel,
RenderingHints hints) {
if (!checkComponentsOrder(srcColorModel) ||
!checkComponentsOrder(dstColorModel)) {
throw new RasterFormatException("Incompatible color models");
}
return new BlendingContext(this);
}
private static final class BlendingContext implements CompositeContext {
private final Blender blender;
private final BlendComposite composite;
private BlendingContext(BlendComposite composite) {
this.ruposite = composite;
this.blender = Blender.getBlenderFor(composite);
}
public void dispose() {
}
public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {
int width = Math.min(src.getWidth(), dstIn.getWidth());
int height = Math.min(src.getHeight(), dstIn.getHeight());
float alpha = composite.getAlpha();
int[] result = new int[4];
int[] srcPixel = new int[4];
int[] dstPixel = new int[4];
int[] srcPixels = new int[width];
int[] dstPixels = new int[width];
for (int y = 0; y < height; y++) {
src.getDataElements(0, y, width, 1, srcPixels);
dstIn.getDataElements(0, y, width, 1, dstPixels);
for (int x = 0; x < width; x++) {
// pixels are stored as INT_ARGB
// our arrays are [R, G, B, A]
int pixel = srcPixels[x];
srcPixel[0] = (pixel >> 16) & 0xFF;
srcPixel[1] = (pixel >> 8) & 0xFF;
srcPixel[2] = (pixel ) & 0xFF;
srcPixel[3] = (pixel >> 24) & 0xFF;
pixel = dstPixels[x];
dstPixel[0] = (pixel >> 16) & 0xFF;
dstPixel[1] = (pixel >> 8) & 0xFF;
dstPixel[2] = (pixel ) & 0xFF;
dstPixel[3] = (pixel >> 24) & 0xFF;
blender.blend(srcPixel, dstPixel, result);
// mixes the result with the opacity
dstPixels[x] = ((int) (dstPixel[3] + (result[3] - dstPixel[3]) * alpha) & 0xFF) << 24 |
((int) (dstPixel[0] + (result[0] - dstPixel[0]) * alpha) & 0xFF) << 16 |
((int) (dstPixel[1] + (result[1] - dstPixel[1]) * alpha) & 0xFF) << 8 |
(int) (dstPixel[2] + (result[2] - dstPixel[2]) * alpha) & 0xFF;
}
dstOut.setDataElements(0, y, width, 1, dstPixels);
}
}
}
private static abstract class Blender {
public abstract void blend(int[] src, int[] dst, int[] result);
public static Blender getBlenderFor(BlendComposite composite) {
switch (composite.getMode()) {
case ADD:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.min(255, src[0] + dst[0]);
result[1] = Math.min(255, src[1] + dst[1]);
result[2] = Math.min(255, src[2] + dst[2]);
result[3] = Math.min(255, src[3] + dst[3]);
}
};
case AVERAGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = (src[0] + dst[0]) >> 1;
result[1] = (src[1] + dst[1]) >> 1;
result[2] = (src[2] + dst[2]) >> 1;
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case BLUE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0];
result[1] = src[1];
result[2] = dst[2];
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
ColorUtilities.HSLtoRGB(srcHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR_BURN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[0]) << 8) / src[0]));
result[1] = src[1] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[1]) << 8) / src[1]));
result[2] = src[2] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[2]) << 8) / src[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case COLOR_DODGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 255 ? 255 :
Math.min((dst[0] << 8) / (255 - src[0]), 255);
result[1] = src[1] == 255 ? 255 :
Math.min((dst[1] << 8) / (255 - src[1]), 255);
result[2] = src[2] == 255 ? 255 :
Math.min((dst[2] << 8) / (255 - src[2]), 255);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case DARKEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.min(src[0], dst[0]);
result[1] = Math.min(src[1], dst[1]);
result[2] = Math.min(src[2], dst[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case DIFFERENCE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.abs(dst[0] - src[0]);
result[1] = Math.abs(dst[1] - src[1]);
result[2] = Math.abs(dst[2] - src[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case EXCLUSION:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] + src[0] - (dst[0] * src[0] >> 7);
result[1] = dst[1] + src[1] - (dst[1] * src[1] >> 7);
result[2] = dst[2] + src[2] - (dst[2] * src[2] >> 7);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case FREEZE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[0]) * (255 - dst[0]) / src[0]);
result[1] = src[1] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[1]) * (255 - dst[1]) / src[1]);
result[2] = src[2] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[2]) * (255 - dst[2]) / src[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case GLOW:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] == 255 ? 255 :
Math.min(255, src[0] * src[0] / (255 - dst[0]));
result[1] = dst[1] == 255 ? 255 :
Math.min(255, src[1] * src[1] / (255 - dst[1]));
result[2] = dst[2] == 255 ? 255 :
Math.min(255, src[2] * src[2] / (255 - dst[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case GREEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0];
result[1] = dst[1];
result[2] = src[2];
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case HARD_LIGHT:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] < 128 ? dst[0] * src[0] >> 7 :
255 - ((255 - src[0]) * (255 - dst[0]) >> 7);
result[1] = src[1] < 128 ? dst[1] * src[1] >> 7 :
255 - ((255 - src[1]) * (255 - dst[1]) >> 7);
result[2] = src[2] < 128 ? dst[2] * src[2] >> 7 :
255 - ((255 - src[2]) * (255 - dst[2]) >> 7);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case HEAT:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] == 0 ? 0 :
Math.max(0, 255 - (255 - src[0]) * (255 - src[0]) / dst[0]);
result[1] = dst[1] == 0 ? 0 :
Math.max(0, 255 - (255 - src[1]) * (255 - src[1]) / dst[1]);
result[2] = dst[2] == 0 ? 0 :
Math.max(0, 255 - (255 - src[2]) * (255 - src[2]) / dst[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case HUE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
ColorUtilities.HSLtoRGB(srcHSL[0], dstHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case INVERSE_COLOR_BURN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[0]) << 8) / dst[0]));
result[1] = dst[1] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[1]) << 8) / dst[1]));
result[2] = dst[2] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[2]) << 8) / dst[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case INVERSE_COLOR_DODGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] == 255 ? 255 :
Math.min((src[0] << 8) / (255 - dst[0]), 255);
result[1] = dst[1] == 255 ? 255 :
Math.min((src[1] << 8) / (255 - dst[1]), 255);
result[2] = dst[2] == 255 ? 255 :
Math.min((src[2] << 8) / (255 - dst[2]), 255);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case LIGHTEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.max(src[0], dst[0]);
result[1] = Math.max(src[1], dst[1]);
result[2] = Math.max(src[2], dst[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case LUMINOSITY:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
ColorUtilities.HSLtoRGB(dstHSL[0], dstHSL[1], srcHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case MULTIPLY:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = (src[0] * dst[0]) >> 8;
result[1] = (src[1] * dst[1]) >> 8;
result[2] = (src[2] * dst[2]) >> 8;
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case NEGATION:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = 255 - Math.abs(255 - dst[0] - src[0]);
result[1] = 255 - Math.abs(255 - dst[1] - src[1]);
result[2] = 255 - Math.abs(255 - dst[2] - src[2]);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case OVERLAY:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] < 128 ? dst[0] * src[0] >> 7 :
255 - ((255 - dst[0]) * (255 - src[0]) >> 7);
result[1] = dst[1] < 128 ? dst[1] * src[1] >> 7 :
255 - ((255 - dst[1]) * (255 - src[1]) >> 7);
result[2] = dst[2] < 128 ? dst[2] * src[2] >> 7 :
255 - ((255 - dst[2]) * (255 - src[2]) >> 7);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case RED:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0];
result[1] = dst[1];
result[2] = dst[2];
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case REFLECT:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = src[0] == 255 ? 255 :
Math.min(255, dst[0] * dst[0] / (255 - src[0]));
result[1] = src[1] == 255 ? 255 :
Math.min(255, dst[1] * dst[1] / (255 - src[1]));
result[2] = src[2] == 255 ? 255 :
Math.min(255, dst[2] * dst[2] / (255 - src[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SATURATION:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
ColorUtilities.RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
ColorUtilities.RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
ColorUtilities.HSLtoRGB(dstHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SCREEN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = 255 - ((255 - src[0]) * (255 - dst[0]) >> 8);
result[1] = 255 - ((255 - src[1]) * (255 - dst[1]) >> 8);
result[2] = 255 - ((255 - src[2]) * (255 - dst[2]) >> 8);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SOFT_BURN:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] + src[0] < 256 ?
(dst[0] == 255 ? 255 :
Math.min(255, (src[0] << 7) / (255 - dst[0]))) :
Math.max(0, 255 - (((255 - dst[0]) << 7) / src[0]));
result[1] = dst[1] + src[1] < 256 ?
(dst[1] == 255 ? 255 :
Math.min(255, (src[1] << 7) / (255 - dst[1]))) :
Math.max(0, 255 - (((255 - dst[1]) << 7) / src[1]));
result[2] = dst[2] + src[2] < 256 ?
(dst[2] == 255 ? 255 :
Math.min(255, (src[2] << 7) / (255 - dst[2]))) :
Math.max(0, 255 - (((255 - dst[2]) << 7) / src[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SOFT_DODGE:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = dst[0] + src[0] < 256 ?
(src[0] == 255 ? 255 :
Math.min(255, (dst[0] << 7) / (255 - src[0]))) :
Math.max(0, 255 - (((255 - src[0]) << 7) / dst[0]));
result[1] = dst[1] + src[1] < 256 ?
(src[1] == 255 ? 255 :
Math.min(255, (dst[1] << 7) / (255 - src[1]))) :
Math.max(0, 255 - (((255 - src[1]) << 7) / dst[1]));
result[2] = dst[2] + src[2] < 256 ?
(src[2] == 255 ? 255 :
Math.min(255, (dst[2] << 7) / (255 - src[2]))) :
Math.max(0, 255 - (((255 - src[2]) << 7) / dst[2]));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SOFT_LIGHT:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
int mRed = src[0] * dst[0] / 255;
int mGreen = src[1] * dst[1] / 255;
int mBlue = src[2] * dst[2] / 255;
result[0] = mRed + src[0] * (255 - ((255 - src[0]) * (255 - dst[0]) / 255) - mRed) / 255;
result[1] = mGreen + src[1] * (255 - ((255 - src[1]) * (255 - dst[1]) / 255) - mGreen) / 255;
result[2] = mBlue + src[2] * (255 - ((255 - src[2]) * (255 - dst[2]) / 255) - mBlue) / 255;
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case STAMP:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.max(0, Math.min(255, dst[0] + 2 * src[0] - 256));
result[1] = Math.max(0, Math.min(255, dst[1] + 2 * src[1] - 256));
result[2] = Math.max(0, Math.min(255, dst[2] + 2 * src[2] - 256));
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
case SUBTRACT:
return new Blender() {
@Override
public void blend(int[] src, int[] dst, int[] result) {
result[0] = Math.max(0, src[0] + dst[0] - 256);
result[1] = Math.max(0, src[1] + dst[1] - 256);
result[2] = Math.max(0, src[2] + dst[2] - 256);
result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
}
};
}
throw new IllegalArgumentException("Blender not implemented for " +
composite.getMode().name());
}
}
} /*
* $Id: GraphicsUtilities.java,v 1.1 2006/12/15 13:53:13 gfx Exp $ * * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy). * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.ru> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */
/**
*GraphicsUtilities contains a set of tools to perform
* common graphics operations easily. These operations are divided into
* several themes, listed below.
Compatible Images
*Compatible images can, and should, be used to increase drawing * performance. This class provides a number of methods to load compatible * images directly from files or to convert existing images to compatibles * images.
*Creating Thumbnails
*This class provides a number of methods to easily scale down images. * Some of these methods offer a trade-off between speed and result quality and * shouuld be used all the time. They also offer the advantage of producing * compatible images, thus automatically resulting into better runtime * performance.
*All these methodes are both faster than
* {@link java.awt.Image#getScaledInstance(int, int, int)} and produce
* better-looking results than the various drawImage() methods
* in {@link java.awt.Graphics}, which can be used for image scaling.
Image Manipulation
*This class provides two methods to get and set pixels in a buffered image. * These methods try to avoid unmanaging the image in order to keep good * performance.
*
* @author Romain Guy <romain.guy@mac.ru>
*/
class GraphicsUtilities {
private static final GraphicsConfiguration CONFIGURATION =
GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getDefaultConfiguration();
private GraphicsUtilities() {
}
/**
* Returns a new BufferedImage using the same color model
* as the image passed as a parameter. The returned image is only compatible
* with the image passed as a parameter. This does not mean the returned
* image is compatible with the hardware.
*
* @param image the reference image from which the color model of the new
* image is obtained
* @return a new BufferedImage, compatible with the color model
* of image
*/
public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
ColorModel cm = image.getColorModel();
return new BufferedImage(cm,
cm.createCompatibleWritableRaster(image.getWidth(),
image.getHeight()),
cm.isAlphaPremultiplied(), null);
}
/**
* Returns a new compatible image with the same width, height and * transparency as the image specified as a parameter.
*
* @see java.awt.Transparency
* @see #createCompatibleImage(int, int)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createTranslucentCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param image the reference image from which the dimension and the
* transparency of the new image are obtained
* @return a new compatible BufferedImage with the same
* dimension and transparency as image
*/
public static BufferedImage createCompatibleImage(BufferedImage image) {
return createCompatibleImage(image, image.getWidth(), image.getHeight());
}
/**
* Returns a new compatible image of the specified width and height, and * the same transparency setting as the image specified as a parameter.
*
* @see java.awt.Transparency
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(int, int)
* @see #createTranslucentCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @param image the reference image from which the transparency of the new
* image is obtained
* @return a new compatible BufferedImage with the same
* transparency as image and the specified dimension
*/
public static BufferedImage createCompatibleImage(BufferedImage image,
int width, int height) {
return CONFIGURATION.createCompatibleImage(width, height,
image.getTransparency());
}
/**
* Returns a new opaque compatible image of the specified width and * height.
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createTranslucentCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @return a new opaque compatible BufferedImage of the
* specified width and height
*/
public static BufferedImage createCompatibleImage(int width, int height) {
return CONFIGURATION.createCompatibleImage(width, height);
}
/**
* Returns a new translucent compatible image of the specified width * and height.
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param width the width of the new image
* @param height the height of the new image
* @return a new translucent compatible BufferedImage of the
* specified width and height
*/
public static BufferedImage createTranslucentCompatibleImage(int width,
int height) {
return CONFIGURATION.createCompatibleImage(width, height,
Transparency.TRANSLUCENT);
}
/**
* Returns a new compatible image from a URL. The image is loaded from the * specified location and then turned, if necessary into a compatible * image.
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #createTranslucentCompatibleImage(int, int)
* @see #toCompatibleImage(java.awt.image.BufferedImage)
* @param resource the URL of the picture to load as a compatible image
* @return a new translucent compatible BufferedImage of the
* specified width and height
* @throws java.io.IOException if the image cannot be read or loaded
*/
public static BufferedImage loadCompatibleImage(URL resource)
throws IOException {
BufferedImage image = ImageIO.read(resource);
return toCompatibleImage(image);
}
/**
* Return a new compatible image that contains a copy of the specified * image. This method ensures an image is compatible with the hardware, * and therefore optimized for fast blitting operations.
*
* @see #createCompatibleImage(java.awt.image.BufferedImage)
* @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
* @see #createCompatibleImage(int, int)
* @see #createTranslucentCompatibleImage(int, int)
* @see #loadCompatibleImage(java.net.URL)
* @param image the image to copy into a new compatible image
* @return a new compatible copy, with the
* same width and height and transparency and content, of image
*/
public static BufferedImage toCompatibleImage(BufferedImage image) {
if (image.getColorModel().equals(CONFIGURATION.getColorModel())) {
return image;
}
BufferedImage compatibleImage = CONFIGURATION.createCompatibleImage(
image.getWidth(), image.getHeight(), image.getTransparency());
Graphics g = compatibleImage.getGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return compatibleImage;
}
/**
* Returns a thumbnail of a source image. newSize defines
* the length of the longest dimension of the thumbnail. The other
* dimension is then computed according to the dimensions ratio of the
* original picture.
This method favors speed over quality. When the new size is less than * half the longest dimension of the source image, * {@link #createThumbnail(BufferedImage, int)} or * {@link #createThumbnail(BufferedImage, int, int)} should be used instead * to ensure the quality of the result without sacrificing too much * performance.
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newSize the length of the largest dimension of the thumbnail
* @return a new compatible BufferedImage containing a
* thumbnail of image
* @throws IllegalArgumentException if newSize is larger than
* the largest dimension of image or <= 0
*/
public static BufferedImage createThumbnailFast(BufferedImage image,
int newSize) {
float ratio;
int width = image.getWidth();
int height = image.getHeight();
if (width > height) {
if (newSize >= width) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image width");
} else if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
ratio = (float) width / (float) height;
width = newSize;
height = (int) (newSize / ratio);
} else {
if (newSize >= height) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image height");
} else if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
ratio = (float) height / (float) width;
height = newSize;
width = (int) (newSize / ratio);
}
BufferedImage temp = createCompatibleImage(image, width, height);
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
return temp;
}
/**
* Returns a thumbnail of a source image.
*This method favors speed over quality. When the new size is less than * half the longest dimension of the source image, * {@link #createThumbnail(BufferedImage, int)} or * {@link #createThumbnail(BufferedImage, int, int)} should be used instead * to ensure the quality of the result without sacrificing too much * performance.
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newWidth the width of the thumbnail
* @param newHeight the height of the thumbnail
* @return a new compatible BufferedImage containing a
* thumbnail of image
* @throws IllegalArgumentException if newWidth is larger than
* the width of image or if code>newHeight</code> is larger
* than the height of image or if one of the dimensions
* is <= 0
*/
public static BufferedImage createThumbnailFast(BufferedImage image,
int newWidth, int newHeight) {
if (newWidth >= image.getWidth() ||
newHeight >= image.getHeight()) {
throw new IllegalArgumentException("newWidth and newHeight cannot" +
" be greater than the image" +
" dimensions");
} else if (newWidth <= 0 || newHeight <= 0) {
throw new IllegalArgumentException("newWidth and newHeight must" +
" be greater than 0");
}
BufferedImage temp = createCompatibleImage(image, newWidth, newHeight);
Graphics2D g2 = temp.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
g2.dispose();
return temp;
}
/**
* Returns a thumbnail of a source image. newSize defines
* the length of the longest dimension of the thumbnail. The other
* dimension is then computed according to the dimensions ratio of the
* original picture.
This method offers a good trade-off between speed and quality. * The result looks better than * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when * the new size is less than half the longest dimension of the source * image, yet the rendering speed is almost similar.
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int, int)
* @param image the source image
* @param newSize the length of the largest dimension of the thumbnail
* @return a new compatible BufferedImage containing a
* thumbnail of image
* @throws IllegalArgumentException if newSize is larger than
* the largest dimension of image or <= 0
*/
public static BufferedImage createThumbnail(BufferedImage image,
int newSize) {
int width = image.getWidth();
int height = image.getHeight();
boolean isWidthGreater = width > height;
if (isWidthGreater) {
if (newSize >= width) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image width");
}
} else if (newSize >= height) {
throw new IllegalArgumentException("newSize must be lower than" +
" the image height");
}
if (newSize <= 0) {
throw new IllegalArgumentException("newSize must" +
" be greater than 0");
}
float ratioWH = (float) width / (float) height;
float ratioHW = (float) height / (float) width;
BufferedImage thumb = image;
do {
if (isWidthGreater) {
width /= 2;
if (width < newSize) {
width = newSize;
}
height = (int) (width / ratioWH);
} else {
height /= 2;
if (height < newSize) {
height = newSize;
}
width = (int) (height / ratioHW);
}
BufferedImage temp = createCompatibleImage(image, width, height);
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 (newSize != (isWidthGreater ? width : height));
return thumb;
}
/**
* Returns a thumbnail of a source image.
*This method offers a good trade-off between speed and quality. * The result looks better than * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when * the new size is less than half the longest dimension of the source * image, yet the rendering speed is almost similar.
*
* @see #createThumbnailFast(java.awt.image.BufferedImage, int)
* @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
* @see #createThumbnail(java.awt.image.BufferedImage, int)
* @param image the source image
* @param newWidth the width of the thumbnail
* @param newHeight the height of the thumbnail
* @return a new compatible BufferedImage containing a
* thumbnail of image
* @throws IllegalArgumentException if newWidth is larger than
* the width of image or if code>newHeight</code> is larger
* than the height of image or if one the dimensions is not > 0
*/
public static BufferedImage createThumbnail(BufferedImage image,
int newWidth, int newHeight) {
int width = image.getWidth();
int height = image.getHeight();
if (newWidth >= width || newHeight >= height) {
throw new IllegalArgumentException("newWidth and newHeight cannot" +
" be greater than the image" +
" dimensions");
} else if (newWidth <= 0 || newHeight <= 0) {
throw new IllegalArgumentException("newWidth and newHeight must" +
" be greater than 0");
}
BufferedImage thumb = image;
do {
if (width > newWidth) {
width /= 2;
if (width < newWidth) {
width = newWidth;
}
}
if (height > newHeight) {
height /= 2;
if (height < newHeight) {
height = newHeight;
}
}
BufferedImage temp = createCompatibleImage(image, width, height);
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 != newWidth || height != newHeight);
return thumb;
}
/**
* Returns an array of pixels, stored as integers, from a
* BufferedImage. The pixels are grabbed from a rectangular
* area defined by a location and two dimensions. Calling this method on
* an image of type different from BufferedImage.TYPE_INT_ARGB
* and BufferedImage.TYPE_INT_RGB will unmanage the image.
*
* @param img the source image
* @param x the x location at which to start grabbing pixels
* @param y the y location at which to start grabbing pixels
* @param w the width of the rectangle of pixels to grab
* @param h the height of the rectangle of pixels to grab
* @param pixels a pre-allocated array of pixels of size w*h; can be null
* @return pixels if non-null, a new array of integers
* otherwise
* @throws IllegalArgumentException is pixels is non-null and
* of length < w*h
*/
public static int[] getPixels(BufferedImage img,
int x, int y, int w, int h, int[] pixels) {
if (w == 0 || h == 0) {
return new int[0];
}
if (pixels == null) {
pixels = new int[w * h];
} else if (pixels.length < w * h) {
throw new IllegalArgumentException("pixels array must have a length" +
" >= w*h");
}
int imageType = img.getType();
if (imageType == BufferedImage.TYPE_INT_ARGB ||
imageType == BufferedImage.TYPE_INT_RGB) {
Raster raster = img.getRaster();
return (int[]) raster.getDataElements(x, y, w, h, pixels);
}
// Unmanages the image
return img.getRGB(x, y, w, h, pixels, 0, w);
}
/**
* Writes a rectangular area of pixels in the destination
* BufferedImage. Calling this method on
* an image of type different from BufferedImage.TYPE_INT_ARGB
* and BufferedImage.TYPE_INT_RGB will unmanage the image.
*
* @param img the destination image
* @param x the x location at which to start storing pixels
* @param y the y location at which to start storing pixels
* @param w the width of the rectangle of pixels to store
* @param h the height of the rectangle of pixels to store
* @param pixels an array of pixels, stored as integers
* @throws IllegalArgumentException is pixels is non-null and
* of length < w*h
*/
public static void setPixels(BufferedImage img,
int x, int y, int w, int h, int[] pixels) {
if (pixels == null || w == 0 || h == 0) {
return;
} else if (pixels.length < w * h) {
throw new IllegalArgumentException("pixels array must have a length" +
" >= w*h");
}
int imageType = img.getType();
if (imageType == BufferedImage.TYPE_INT_ARGB ||
imageType == BufferedImage.TYPE_INT_RGB) {
WritableRaster raster = img.getRaster();
raster.setDataElements(x, y, w, h, pixels);
} else {
// Unmanages the image
img.setRGB(x, y, w, h, pixels, 0, w);
}
}
}
/* * $Id: ColorUtilities.java,v 1.1 2006/12/15 13:53:13 gfx Exp $ * * Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy). * * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.ru> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */
/***
ColorUtilities contains a set of tools to perform
* common color operations easily.
*
* @author Romain Guy <romain.guy@mac.ru>
*/
class ColorUtilities {
private ColorUtilities() {
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param color the RGB color to convert
* @return a new array of 3 floats corresponding to the HSL components
*/
public static float[] RGBtoHSL(Color color) {
return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), null);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param color the RGB color to convert
* @param hsl a pre-allocated array of floats; can be null
* @return hsl if non-null, a new array of 3 floats otherwise
* @throws IllegalArgumentException if hsl has a length lower
* than 3
*/
public static float[] RGBtoHSL(Color color, float[] hsl) {
return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), hsl);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.
*
* @param r the red component, between 0 and 255
* @param g the green component, between 0 and 255
* @param b the blue component, between 0 and 255
* @return a new array of 3 floats corresponding to the HSL components
*/
public static float[] RGBtoHSL(int r, int g, int b) {
return RGBtoHSL(r, g, b, null);
}
/**
* Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are floats between 0.0 and 1.0.
*
* @param r the red component, between 0 and 255
* @param g the green component, between 0 and 255
* @param b the blue component, between 0 and 255
* @param hsl a pre-allocated array of floats; can be null
* @return hsl if non-null, a new array of 3 floats otherwise
* @throws IllegalArgumentException if hsl has a length lower
* than 3
*/
public static float[] RGBtoHSL(int r, int g, int b, float[] hsl) {
if (hsl == null) {
hsl = new float[3];
} else if (hsl.length < 3) {
throw new IllegalArgumentException("hsl array must have a length of" +
" at least 3");
}
if (r < 0) r = 0;
else if (r > 255) r = 255;
if (g < 0) g = 0;
else if (g > 255) g = 255;
if (b < 0) b = 0;
else if (b > 255) b = 255;
float var_R = (r / 255f);
float var_G = (g / 255f);
float var_B = (b / 255f);
float var_Min;
float var_Max;
float del_Max;
if (var_R > var_G) {
var_Min = var_G;
var_Max = var_R;
} else {
var_Min = var_R;
var_Max = var_G;
}
if (var_B > var_Max) {
var_Max = var_B;
}
if (var_B < var_Min) {
var_Min = var_B;
}
del_Max = var_Max - var_Min;
float H, S, L;
L = (var_Max + var_Min) / 2f;
if (del_Max - 0.01f <= 0.0f) {
H = 0;
S = 0;
} else {
if (L < 0.5f) {
S = del_Max / (var_Max + var_Min);
} else {
S = del_Max / (2 - var_Max - var_Min);
}
float del_R = (((var_Max - var_R) / 6f) + (del_Max / 2f)) / del_Max;
float del_G = (((var_Max - var_G) / 6f) + (del_Max / 2f)) / del_Max;
float del_B = (((var_Max - var_B) / 6f) + (del_Max / 2f)) / del_Max;
if (var_R == var_Max) {
H = del_B - del_G;
} else if (var_G == var_Max) {
H = (1 / 3f) + del_R - del_B;
} else {
H = (2 / 3f) + del_G - del_R;
}
if (H < 0) {
H += 1;
}
if (H > 1) {
H -= 1;
}
}
hsl[0] = H;
hsl[1] = S;
hsl[2] = L;
return hsl;
}
/**
* Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color.
*
* @param h the hue component, between 0.0 and 1.0
* @param s the saturation component, between 0.0 and 1.0
* @param l the luminance component, between 0.0 and 1.0
* @return a new Color object equivalent to the HSL components
*/
public static Color HSLtoRGB(float h, float s, float l) {
int[] rgb = HSLtoRGB(h, s, l, null);
return new Color(rgb[0], rgb[1], rgb[2]);
}
/**
* Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color. All three RGB components are integers between 0 and 255.
*
* @param h the hue component, between 0.0 and 1.0
* @param s the saturation component, between 0.0 and 1.0
* @param l the luminance component, between 0.0 and 1.0
* @param rgb a pre-allocated array of ints; can be null
* @return rgb if non-null, a new array of 3 ints otherwise
* @throws IllegalArgumentException if rgb has a length lower
* than 3
*/
public static int[] HSLtoRGB(float h, float s, float l, int[] rgb) {
if (rgb == null) {
rgb = new int[3];
} else if (rgb.length < 3) {
throw new IllegalArgumentException("rgb array must have a length of" +
" at least 3");
}
if (h < 0) h = 0.0f;
else if (h > 1.0f) h = 1.0f;
if (s < 0) s = 0.0f;
else if (s > 1.0f) s = 1.0f;
if (l < 0) l = 0.0f;
else if (l > 1.0f) l = 1.0f;
int R, G, B;
if (s - 0.01f <= 0.0f) {
R = (int) (l * 255.0f);
G = (int) (l * 255.0f);
B = (int) (l * 255.0f);
} else {
float var_1, var_2;
if (l < 0.5f) {
var_2 = l * (1 + s);
} else {
var_2 = (l + s) - (s * l);
}
var_1 = 2 * l - var_2;
R = (int) (255.0f * hue2RGB(var_1, var_2, h + (1.0f / 3.0f)));
G = (int) (255.0f * hue2RGB(var_1, var_2, h));
B = (int) (255.0f * hue2RGB(var_1, var_2, h - (1.0f / 3.0f)));
}
rgb[0] = R;
rgb[1] = G;
rgb[2] = B;
return rgb;
}
private static float hue2RGB(float v1, float v2, float vH) {
if (vH < 0.0f) {
vH += 1.0f;
}
if (vH > 1.0f) {
vH -= 1.0f;
}
if ((6.0f * vH) < 1.0f) {
return (v1 + (v2 - v1) * 6.0f * vH);
}
if ((2.0f * vH) < 1.0f) {
return (v2);
}
if ((3.0f * vH) < 2.0f) {
return (v1 + (v2 - v1) * ((2.0f / 3.0f) - vH) * 6.0f);
}
return (v1);
}
}
</source>
Composite demo
<source lang="java"> import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.geom.Ellipse2D; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import javax.swing.JApplet; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class Composite extends JApplet implements ItemListener {
CompPanel comp;
JLabel alphaLabel = new JLabel("Alphas");
JLabel rulesLabel = new JLabel("Rules");
JComboBox alphas = new JComboBox();
JComboBox rules = new JComboBox();
String alpha = "1.0";
int rule = 0;
public void init() {
getContentPane().setLayout(new FlowLayout());
getContentPane().add(alphaLabel);
getContentPane().add(rulesLabel);
alphas.addItem("1.0");
alphas.addItem("0.75");
alphas.addItem("0.50");
alphas.addItem("0.25");
alphas.addItem("0.0");
alphas.addItemListener(this);
getContentPane().add(alphas);
rules.addItem("SRC");
rules.addItem("DST_IN");
rules.addItem("DST_OUT");
rules.addItem("DST_OVER");
rules.addItem("SRC_IN");
rules.addItem("SRC_OVER");
rules.addItem("SRC_OUT");
rules.addItem("CLEAR");
rules.addItemListener(this);
getContentPane().add(rules);
comp = new CompPanel();
getContentPane().add(comp);
validate();
}
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() != ItemEvent.SELECTED) {
return;
}
Object choice = e.getSource();
if (choice == alphas) {
alpha = (String) alphas.getSelectedItem();
} else {
rule = rules.getSelectedIndex();
}
comp.changeRule(alpha, rule);
}
public static void main(String s[]) {
JFrame f = new JFrame("Composite");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JApplet applet = new Composite();
f.getContentPane().add("Center", applet);
applet.init();
f.pack();
f.setSize(new Dimension(300, 300));
f.show();
}
} class CompPanel extends JPanel {
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC);
float alpha = 1.0f;
public CompPanel() {
setPreferredSize(new Dimension(250, 250));
}
public void changeRule(String a, int rule) {
alpha = Float.valueOf(a).floatValue();
ac = AlphaComposite.getInstance(getRule(rule), alpha);
repaint();
}
public int getRule(int rule) {
int alphaComp = 0;
switch (rule) {
case 0:
alphaComp = AlphaComposite.SRC;
break;
case 1:
alphaComp = AlphaComposite.DST_IN;
break;
case 2:
alphaComp = AlphaComposite.DST_OUT;
break;
case 3:
alphaComp = AlphaComposite.DST_OVER;
break;
case 4:
alphaComp = AlphaComposite.SRC_IN;
break;
case 5:
alphaComp = AlphaComposite.SRC_OVER;
break;
case 6:
alphaComp = AlphaComposite.SRC_OUT;
break;
case 7:
alphaComp = AlphaComposite.CLEAR;
break;
}
return alphaComp;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
int w = d.width;
int h = d.height;
BufferedImage buffImg = new BufferedImage(w, h,
BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
g2.setColor(Color.white);
g2.fillRect(0, 0, d.width, d.height);
int rectx = w / 4;
int recty = h / 4;
gbi.setColor(new Color(0.0f, 0.0f, 1.0f, 1.0f));
gbi.fill(new Rectangle2D.Double(rectx, recty, 150, 100));
gbi.setColor(new Color(1.0f, 0.0f, 0.0f, 1.0f));
gbi.setComposite(ac);
gbi.fill(new Ellipse2D.Double(rectx + rectx / 2, recty + recty / 2,
150, 100));
g2.drawImage(buffImg, null, 0, 0);
}
}
</source>
Composite Effects
<source lang="java"> /*
* Copyright (c) 2000 David Flanagan. All rights reserved. This code is from the * book Java Examples in a Nutshell, 2nd Edition. It is provided AS-IS, WITHOUT * ANY WARRANTY either expressed or implied. You may study, use, and modify it * for any non-commercial purpose. You may distribute it non-commercially as * long as you retain this notice. For a commercial use license, or to purchase * the book (recommended), visit http://www.davidflanagan.ru/javaexamples2. */
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Font; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Rectangle; import java.awt.Shape; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.geom.Area; import java.awt.geom.Ellipse2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositeEffects extends JPanel{
Image cover; // The image we"ll be displaying, and its size
static final int COVERWIDTH = 127, COVERHEIGHT = 190;
/** This constructor loads the cover image */
public CompositeEffects() {
java.net.URL imageurl = this.getClass().getResource("jexp.gif");
cover = new javax.swing.ImageIcon(imageurl).getImage();
}
// These are basic GraphicsExample methods
public String getName() {
return "Composite Effects";
}
public int getWidth() {
return 6 * COVERWIDTH + 70;
}
public int getHeight() {
return COVERHEIGHT + 35;
}
/** Draw the example */
public void paint(Graphics g1) {
Graphics2D g = (Graphics2D)g1;
// fill the background
g.setPaint(new Color(175, 175, 175));
g.fillRect(0, 0, getWidth(), getHeight());
// Set text attributes
g.setColor(Color.black);
g.setFont(new Font("SansSerif", Font.BOLD, 12));
// Draw the unmodified image
g.translate(10, 10);
g.drawImage(cover, 0, 0, this);
g.drawString("SRC_OVER", 0, COVERHEIGHT + 15);
// Draw the cover again, using AlphaComposite to make the opaque
// colors of the image 50% translucent
g.translate(COVERWIDTH + 10, 0);
g.setComposite(AlphaComposite
.getInstance(AlphaComposite.SRC_OVER, 0.5f));
g.drawImage(cover, 0, 0, this);
// Restore the pre-defined default Composite for the screen, so
// opaque colors stay opaque.
g.setComposite(AlphaComposite.SrcOver);
// Label the effect
g.drawString("SRC_OVER, 50%", 0, COVERHEIGHT + 15);
// Now get an offscreen image to work with. In order to achieve
// certain compositing effects, the drawing surface must support
// transparency. Onscreen drawing surfaces cannot, so we have to do the
// compositing in an offscreen image that is specially created to have
// an "alpha channel", then copy the final result to the screen.
BufferedImage offscreen = new BufferedImage(COVERWIDTH, COVERHEIGHT,
BufferedImage.TYPE_INT_ARGB);
// First, fill the image with a color gradient background that varies
// left-to-right from opaque to transparent yellow
Graphics2D osg = offscreen.createGraphics();
osg.setPaint(new GradientPaint(0, 0, Color.yellow, COVERWIDTH, 0,
new Color(255, 255, 0, 0)));
osg.fillRect(0, 0, COVERWIDTH, COVERHEIGHT);
// Now copy the cover image on top of this, but use the DstOver rule
// which draws it "underneath" the existing pixels, and allows the
// image to show depending on the transparency of those pixels.
osg.setComposite(AlphaComposite.DstOver);
osg.drawImage(cover, 0, 0, this);
// And display this composited image on the screen. Note that the
// image is opaque and that none of the screen background shows through
g.translate(COVERWIDTH + 10, 0);
g.drawImage(offscreen, 0, 0, this);
g.drawString("DST_OVER", 0, COVERHEIGHT + 15);
// Now start over and do a new effect with the off-screen image.
// First, fill the offscreen image with a new color gradient. We
// don"t care about the colors themselves; we just want the
// translucency of the background to vary. We use opaque black to
// transparent black. Note that since we"ve already used this offscreen
// image, we set the composite to Src, we can fill the image and
// ignore anything that is already there.
osg.setComposite(AlphaComposite.Src);
osg.setPaint(new GradientPaint(0, 0, Color.black, COVERWIDTH,
COVERHEIGHT, new Color(0, 0, 0, 0)));
osg.fillRect(0, 0, COVERWIDTH, COVERHEIGHT);
// Now set the compositing type to SrcIn, so colors come from the
// source, but translucency comes from the destination
osg.setComposite(AlphaComposite.SrcIn);
// Draw our loaded image into the off-screen image, compositing it.
osg.drawImage(cover, 0, 0, this);
// And then copy our off-screen image to the screen. Note that the
// image is translucent and some of the image shows through.
g.translate(COVERWIDTH + 10, 0);
g.drawImage(offscreen, 0, 0, this);
g.drawString("SRC_IN", 0, COVERHEIGHT + 15);
// If we do the same thing but use SrcOut, then the resulting image
// will have the inverted translucency values of the destination
osg.setComposite(AlphaComposite.Src);
osg.setPaint(new GradientPaint(0, 0, Color.black, COVERWIDTH,
COVERHEIGHT, new Color(0, 0, 0, 0)));
osg.fillRect(0, 0, COVERWIDTH, COVERHEIGHT);
osg.setComposite(AlphaComposite.SrcOut);
osg.drawImage(cover, 0, 0, this);
g.translate(COVERWIDTH + 10, 0);
g.drawImage(offscreen, 0, 0, this);
g.drawString("SRC_OUT", 0, COVERHEIGHT + 15);
// Here"s a cool effect; it has nothing to do with compositing, but
// uses an arbitrary shape to clip the image. It uses Area to combine
// shapes into more complicated ones.
g.translate(COVERWIDTH + 10, 0);
Shape savedClip = g.getClip(); // Save current clipping region
// Create a shape to use as the new clipping region.
// Begin with an ellipse
Area clip = new Area(new Ellipse2D.Float(0, 0, COVERWIDTH, COVERHEIGHT));
// Intersect with a rectangle, truncating the ellipse.
clip.intersect(new Area(new Rectangle(5, 5, COVERWIDTH - 10,
COVERHEIGHT - 10)));
// Then subtract an ellipse from the bottom of the truncated ellipse.
clip.subtract(new Area(new Ellipse2D.Float(COVERWIDTH / 2 - 40,
COVERHEIGHT - 20, 80, 40)));
// Use the resulting shape as the new clipping region
g.clip(clip);
// Then draw the image through this clipping region
g.drawImage(cover, 0, 0, this);
// Restore the old clipping region so we can label the effect
g.setClip(savedClip);
g.drawString("Clipping", 0, COVERHEIGHT + 15);
}
public static void main(String[] a){
JFrame f = new JFrame();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setContentPane(new CompositeEffects());
f.setSize(700,250);
f.setVisible(true);
}
}
</source>
