java - 屏幕撕裂JPanel游戏和双缓冲

Question

我目前正在使用 JPanel 从我的游戏中绘制元素，但是，在一些研究之后我了解到屏幕撕裂和双缓冲，我相信这是我的问题的解决方案，然而，图形偶尔会出现卡顿，目前使用我的代码，我发现如果不删除大量代码就很难实现。

我想知道是否有人可以提供一种更简单的方法来修复我在基于 2D 图 block 的小型游戏上的屏幕撕裂，或者如何使用我当前的代码进行双缓冲，非常感谢!

框架.java

public class Frame extends JPanel implements KeyListener {

public static Game game;
public static boolean[] mouseDown = new boolean[4];
public static int width, height;
public static Font font = new Font("Arial", Font.BOLD, 16);
public static JFrame frame;
public Frame()
{
    setFocusable(true);
    requestFocus();
    setOpaque(true);
    addKeyListener((KeyListener) this);
    addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent e) {
        }
        @Override
        public void mouseReleased(MouseEvent e) {

        }
    });
    addMouseMotionListener(new MouseMotionListener() {
        @Override
        public void mouseMoved(MouseEvent e) {
        }
        @Override
        public void mouseDragged(MouseEvent e) {
        }
    });
}

@Override
public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;
    g2d.setBackground(Color.BLACK);
    g2d.setFont(font);
    super.setBackground(Color.BLACK);
    super.paintComponent(g2d);
    //This is where I use g2d to draw onto the JPanel
}

public static void main(String[] args) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            frame = new JFrame("Game");
            frame.add(new Frame());
            frame.setSize(1000, 750);
            frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }});
}

游戏.java

    public void gameStart() { 

    Thread gameThread =  new Thread() {
        // Override run() to provide the running behavior of this thread.
        @Override
        public void run() {
            gameLoop();
        }
    };
    // Start the thread. start() calls run(), which in turn calls gameLoop().
    gameThread.start();
}

public void gameLoop() {
    while (!isGameFinished) {
        beginTime = System.nanoTime();
        gameUpdate();
        frame.repaint();
        // Delay timer to provide the necessary delay to meet the target rate
        timeTaken = System.nanoTime() - beginTime;
        timeLeft = (UPDATE_PERIOD_NSEC - timeTaken) / 1000000L;  // in milliseconds
        if (timeLeft < 10) timeLeft = 10;   // set a minimum
        try { // Provides the necessary delay and also yields control so that other thread can do work.
            Thread.sleep(timeLeft);
        } catch (InterruptedException ex) { }
    }
}

public void gameStart() { 

    Thread gameThread =  new Thread() {
        // Override run() to provide the running behavior of this thread.
        @Override
        public void run() {
            gameLoop();
        }
    };
    // Start the thread. start() calls run(), which in turn calls gameLoop().
    gameThread.start();
}

public void gameLoop() {
    while (!isGameFinished) {
        beginTime = System.nanoTime();
        gameUpdate();
        frame.repaint();
        timeTaken = System.nanoTime() - beginTime;
        timeLeft = (UPDATE_PERIOD_NSEC - timeTaken) / 1000000L;
        if (timeLeft < 10) timeLeft = 10;   // set a minimum
        try { 
            Thread.sleep(timeLeft);
        } catch (InterruptedException ex) { }
    }
}

如代码所示，Game 类包含 Game 循环，它将不断重绘 Frame 类。我如何调整此代码以允许双缓冲以消除屏幕撕裂？谢谢!

Answer 1

双缓冲是修复它的最佳方法。尝试调用 Toolkit#sync (Toolkit.getDefaultToolkit().sync()) ，这有时会解决问题。如果切换到双缓冲，您不会拆掉太多代码，只需将 paint 中的代码移动到一个单独的方法即可。