?? mypanel.java~12~
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package transparency;import java.awt.*;import javax.swing.JPanel;import java.awt.geom.*;/** * Title: * Description: * Copyright: Copyright (c) 2001 * Company: * @author * @version 1.0 */public class MyPanel extends JPanel { BorderLayout borderLayout1 = new BorderLayout(); private static int gap=5, width=40, offset=15, deltaX=gap+width+offset;//90 private Rectangle yellowSquare = new Rectangle(gap+offset, gap+offset, width, width), greenSquare = new Rectangle(gap, gap, width, width); public MyPanel() { try { jbInit(); } catch(Exception ex) { ex.printStackTrace(); } } void jbInit() throws Exception { this.setLayout(borderLayout1); } 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.yellow); g2d.fill(yellowSquare); g2d.setComposite(makeComposite(alpha)); g2d.setPaint(Color.green); g2d.fill(greenSquare); 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); } }}?? 快捷鍵說明
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