java - 来自不同类别的双缓冲区？

Question

这在我的类中添加到我的 JFrame 中。谁能帮助我如何使用此类离屏从另一个类中绘制图形？例如，有一个 Player 类 (Player.java) 并从该类中绘制图像和其他内容，但仍然缓冲图像，而不在我绘制的每个类中创建新的双缓冲方法？

package Display;

import Graphics.Player1;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
      import javax.swing.JPanel;



      public class DrawArea extends JPanel implements Runnable{      
    Thread drawLoop = new Thread(this);
    BufferedImage image = new BufferedImage(1000, 700, BufferedImage.TYPE_INT_RGB);
   public Graphics offScreen = image.getGraphics();

    public DrawArea() {
        setSize(1000, 700);
        drawLoop.start();

    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paint(Graphics g) {
        offScreen.setColor(Color.yellow);
        offScreen.fillRect(0, 0, 1000, 700);

        g.drawImage(image, 0, 0, null);
    }

    public void run() {
        while(true) {
            repaint();
            try {
                drawLoop.sleep(90);
            } catch (InterruptedException ex) {
                Logger.getLogger(DrawArea.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }

}

Answer 1

使您的 DrawingPanel 看起来像这样。

public class DrawingPanel extends Canvas {

    public DrawingPanel(){
        setVisible(true);
    }

}

主框架。

public class MyFrame extends JFrame implements Runnable{

    DrawingPanel panel;

    public MyFrame(){
        panel = new DrawingPanel();
        add(panel);
        setVisible(true);
        panel.createBufferStrategy(2);
        new Thread(this).start();
    }

    public void run(){
        BufferStrategy buffer = panel.getBufferStrategy();
        while (true){
            Graphics g = buffer.getDrawGraphics();
            render(g);
            g.dispose();
            buffer.show();
            try {
                Thread.sleep(90);
            } catch (Exception e){}
        }
    }

    public void render(Graphics g){
        // Do your drawing here
    }

    public static void main(String[] args){
        new MyFrame();
    }

}