rotatedemo.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

import java.awt.Graphics2D;
import java.awt.AlphaComposite;
import java.awt.image.*;
import java.awt.*;
import java.applet.*;


public class RotateDemo extends Applet
{
    public void paint(Graphics g)
   {
     g.setColor(Color.red);
     g.fillOval(100,30,100,60);
     Graphics2D g2=(Graphics2D)g;
     int rule=AlphaComposite.SRC_OVER;
     float alpha=0.5f;
     AlphaComposite ac=AlphaComposite.getInstance(rule,alpha);
     g2.setComposite(ac);
     g2.setColor(Color.green);
     g2.translate(150,10);
     g2.rotate((90*Math.PI)/180);
     g2.fillOval(0,-30,100,60);
     
   }
}