JAVA中解决双缓冲现象

末蓝、 2022-06-06 12:44 174阅读 0赞

代码如下：

import java.awt.*;
    import java.awt.event.*;
    public class TankClient extends Frame{ 
        int x=50;
        int y=50;
        Image offScreenImage=null;
        public void paint(Graphics g){
            Color c=g.getColor();
            g.setColor(Color.RED);
            g.fillOval(x, y, 30, 30);//fillOval()方法中参数是int整形
            g.setColor(c);
            y+=5;
        }
        //解决双缓冲现象
        public void update(Graphics g){
            if(offScreenImage==null){
                offScreenImage=this.createImage(800,600);
            }
            Graphics goffScreen=offScreenImage.getGraphics();
            Color c=goffScreen.getColor();
            goffScreen.setColor(Color.GREEN);
            goffScreen.fillRect(0,0,800, 600);
            goffScreen.setColor(c);
            paint(goffScreen);
    
            g.drawImage(offScreenImage, 0, 0, null);
        }
        public void LaunchFrame(){
            this.setLocation(50,50);
            this.setSize(800,600);
            this.setTitle("TankWar");
            this.addWindowListener(new WindowAdapter(){
                @Override
                public void windowClosing(WindowEvent e) {
                    System.exit(0);
                }
            });
            this.setResizable(false);//窗口不可调节大小
            this.setBackground(Color.GREEN);
            this.setVisible(true);
            new Thread(new paintThread()).start();
        }
        public static void main(String[] args) {
            TankClient tk=new TankClient();
            tk.LaunchFrame();
        }
        private class paintThread implements Runnable{ 
            public void run(){
                while(true){
                    repaint();//重量级中repaint首先调用update方法，update然后再调用paint方法。再轻量级组件中repaint直接调用paint方法
                    try {
                        Thread.sleep(50);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
    
                }
            }
        }
    
    }