java绘制缓存图像示例

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用java绘制图像时候，为了速度，需要缓存图像。写一个示例代码，供参考。

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;

class MyPanel extends JPanel{
    private int px = 400;
    private Image newImage = null;

    public MyPanel(){
        super();
        this.setSize(400, 400);
        final MyPanel t = this;
        //内部线程绘制图,具体应用中,一般由外部控制
        new Thread(){
            public void run(){
                try{
                    while(true){
                        t.addPX();
                        t.repaint();
                        this.sleep(10);
                    }
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        }.start();
    }

    public void addPX(){

        if(px>400){
            px = 0;
            //随几绘制背景图
            newImage = new BufferedImage(
                    400,
                    400,
                Transparency.BITMASK);
            Graphics2D g = (Graphics2D)newImage.getGraphics();
            g.setColor(Color.red);
            int t1 = (int)(Math.random()*300);
            int t2 = (int)(Math.random()*300);
            int t3 = (int)(Math.random()*300);
            int t4 = (int)(Math.random()*300);
            int t5 = (int)(Math.random()*300);
            int t6 = (int)(Math.random()*300);
            int t7 = (int)(Math.random()*300);
            int t8 = (int)(Math.random()*300);
            g.fill3DRect(t1, t2, t3, t4, true);
            g.setColor(Color.green);
            g.fillOval(t5, t6, t7, t8);
            g.dispose();
        }
        px ++;
    }

    public void paint(Graphics gt)
    {
        super.paint(gt);
        if(newImage!=null){
            //绘制缓存图片
            gt.drawImage(newImage,0,0,this);
        }
        gt.setColor(Color.blue);
        gt.drawLine(0,0,px,400);
    }


}
//网络大本营 Http://www.QQView.com
public class Main extends JFrame{
    public Main(){
        super("测试页面");
        this.setSize(400,400);
        this.setLocation(100,100);

        Container con=this.getContentPane();
        con.setLayout(null);

        MyPanel mp = new MyPanel();
        mp.setLocation(0, 0);
        con.add(mp);

        //添加关闭退出
        this.addWindowListener(
                new WindowAdapter(){
                    public void windowClosing(WindowEvent event)
                    {
                        System.exit(0);
                    }
                }
            );
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Main view = new Main();
        view.setVisible(true);
    }
}

该文章转载自网络大本营：http://www.xrss.cn/Dev/JAVA/2007121218139.Html