~~~~~~~~~~~~~~~~~~~ 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); } } >>>>>>>>>>>>>>>>>>
Illustrates the effect of different transparency
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