~~~~~~~~~~~~~~~~~~~
TransparencyExample.java Illustrates the effect of different transparency (alpha) values when drawing a shape.
~~~~~~~~~~~~~~~~~~~
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
/** An illustration of the use of AlphaComposite to make
* partially transparent drawings.
*
**********************************
public class TransparencyExample extends JPanel {
private static int gap=10, width=60, offset=20,
deltaX=gap+width+offset;
private Rectangle
blueSquare = new Rectangle(gap+offset, gap+offset, width,
width),
redSquare = new Rectangle(gap, gap, width, width);
private AlphaComposite makeComposite(float alpha) {
int type = AlphaComposite.SRC_OVER;
return(AlphaComposite.getInstance(type, alpha));
}
private void drawSquares(Graphics2D g2d, float alpha) {
Composite originalComposite = g2d.getComposite();
g2d.setPaint(Color.blue);
g2d.fill(blueSquare);
g2d.setComposite(makeComposite(alpha));
g2d.setPaint(Color.red);
g2d.fill(redSquare);
g2d.setComposite(originalComposite);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
for(int i=0; i<11; i++) {
drawSquares(g2d, i*0.1F);
g2d.translate(deltaX, 0);
}
}
public static void main(String[] args) {
String title = "Transparency example: alpha of the top " +
"(red) square ranges from 0.0 at the left " +
"to 1.0 at the right. Bottom (blue) square " +
"is opaque.";
WindowUtilities.openInJFrame(new TransparencyExample(),
11*deltaX + 2*gap,
deltaX + 3*gap,
title, Color.lightGray);
}
}
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