Question

我根据我在stackoverflow上找到的很多例子把这段代码放在一起。当我运行程序时，整个屏幕都会激烈地闪烁。我确信有一些简单的东西我可以忽略，但到目前为止一直无法找到解决方案。我已经调试了几个小时，主要是借助在线论坛阅读，所以我觉得是时候向观众询问了。

public class Screen扩展了JComponent {

    @Override
    public Dimension getPreferredSize(){
        Dimension tempDimension = Toolkit.getDefaultToolkit().getScreenSize();
        return tempDimension;
    }

    @Override
    protected void paintComponent(Graphics g) {

        super.paintComponent(g);
        Graphics2D g2D = (Graphics2D)bufferStrategy.getDrawGraphics();
        g2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); //sprites overlap instead of overwrite
        if(game==null){
            drawSplash(g2D);
        }else{
            drawBoard(g2D);
        }
        g2D.dispose();
        bufferStrategy.show();
    }
}

如果需要任何其他代码，我可以提供。谢谢你的帮助，stackoverflow！

Answer 1

要获得您获得的结果，您要么拥有另一个类，该类从Canvas延伸，要么使用顶级容器中的BufferStrategy。在任何一种情况下，两者都必须在屏幕上可见。

基本上，他们互相争斗，因为他们是两种不同的绘画算法。 Swing是一种被动绘制算法，可根据需要绘制更新，BufferStrategy使用主动算法，要求您根据需要安排对缓冲区的更新。

两者都使用双缓冲算法。

所以，你应该选择一个......

public class Screen extends JComponent {

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(200, 200);
    }

    @Override
    protected void paintComponent(Graphics g) {

        super.paintComponent(g);
        Graphics2D g2D = (Graphics2D) g.create();
        g2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); //sprites overlap instead of overwrite
        if (game == null) {
            drawSplash(g2D);
        } else {
            drawBoard(g2D);
        }
        g2D.dispose();
    }
}

或类似......

public void gameEngine(BufferStrategy strategy) {

    // Main loop
    while (!done) {
        // Prepare for rendering the next frame
        // ...

        // Render single frame
        do {
            // The following loop ensures that the contents of the drawing buffer
            // are consistent in case the underlying surface was recreated
            do {
                // Get a new graphics context every time through the loop
                // to make sure the strategy is validated
                Graphics2D g2D = (Graphics2D) strategy.getDrawGraphics();

                // Render to graphics
                g2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER)); //sprites overlap instead of overwrite
                if (game == null) {
                    drawSplash(g2D);
                } else {
                    drawBoard(g2D);
                }
                // Dispose the graphics
                g2D.dispose();

                // Repeat the rendering if the drawing buffer contents
                // were restored
            } while (strategy.contentsRestored());

            // Display the buffer
            strategy.show();

            // Repeat the rendering if the drawing buffer was lost
        } while (strategy.contentsLost());
    }
}

这几乎是从JavaDocs for BufferStrategy

中扯掉的

BTW，这......

@Override
public Dimension getPreferredSize(){
    Dimension tempDimension = Toolkit.getDefaultToolkit().getScreenSize();
    return tempDimension;
}

是一个非常糟糕的设计，你正在对可能无法满足现实的组件状态做出假设。您应该允许窗口决定它最终想要的大小，这可以通过使用setExtendedState并传递JFrame.MAXIMIZED_BOTH来实现，这将考虑其他操作系统元素，如任务栏或停靠

窗口模式下的BufferStrategy会导致持续强烈的白屏闪烁

1 个答案: