9

所以在我正在开发的游戏中，我有一个弹珠跟随鼠标，但是当它这样做时屏幕会闪烁。

背景包括两个 jpeg 和 9 个矩形。我将如何进行双重缓冲呢？这是主窗口的代码。

/**
 * Write a description of class Window here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Window extends JApplet implements MouseMotionListener
{
    private BufferedImage image; 
    private BufferedImage side;
    private int mouseX;
    private int mouseY;

    public Window(){
        try {
            image = ImageIO.read(new File("Backgrounds/violet.jpg"));
            side = ImageIO.read(new File("Backgrounds/side margin.jpg"));
        } catch (IOException ex) { }    
    }   

    private void delay(int delay)
    {
        try {
            Thread.sleep(delay);
        } catch (InterruptedException e) {}
    }

    public void init()
    {
        this.addMouseMotionListener(this);
    }

    public void paint (Graphics page)
    {
        page.drawImage(image, 0, 0, null);
        page.setColor(Color.blue);
        page.fillRect(0, 0, 160, 160);
        page.setColor(Color.black);
        page.fillRect(15, 15, 130, 130);
        page.setColor(Color.green);
        page.fillRect(340, 0, 160, 160);
        page.setColor(Color.black);
        page.fillRect(355, 15, 130, 130);
        page.setColor(Color.yellow);
        page.fillRect(0, 340, 160, 160);
        page.setColor(Color.black);
        page.fillRect(15, 355, 130, 130);
        page.setColor(Color.red);
        page.fillRect(340, 340, 160, 160);
        page.setColor(Color.black);
        page.fillRect(355, 355, 130, 130);
        page.drawImage(side, 500, 0, null);
        page.drawString(Score.getScore(), 560, 110);
        //conveyors
        page.setColor(Color.gray);
        page.fillRect(235, 0, 30, 160);

        //marble
        delay(100);

        page.fillOval(mouseX, mouseY , 40, 40);          
    }

    public void mouseMoved(MouseEvent e)
    {
        mouseX = e.getX();
        mouseY = e.getY();
        repaint();
    }

    public void mouseDragged(MouseEvent e)
    {

    }
}
4

4 回答 4

21

双缓冲在概念上非常简单，不是一个一个地绘制对象，而是将它们绘制在图像上，然后告诉渲染器绘制整个图像。这消除了闪烁。

这是您如何执行此操作的示例（来源）

class DoubleBufferedCanvas extends Canvas {

    public void update(Graphics g) {
    Graphics offgc;
    Image offscreen = null;
    Dimension d = size();

    // create the offscreen buffer and associated Graphics
    offscreen = createImage(d.width, d.height);
    offgc = offscreen.getGraphics();
    // clear the exposed area
    offgc.setColor(getBackground());
    offgc.fillRect(0, 0, d.width, d.height);
    offgc.setColor(getForeground());
    // do normal redraw
    paint(offgc);
    // transfer offscreen to window
    g.drawImage(offscreen, 0, 0, this);
    }
}

现在，您不必自己实现它，您可以使用 BufferStrategy 和相关类。有关示例，请参见 lakam99 的答案。

于 2012-05-08T23:50:41.143 回答
4

Swing 自动支持双缓冲，因此您无需编写任何代码。

只需调用setDoubleBuffered(true)您的顶级组件（通常是 JPanel），它应该都能正常工作。

看：setDoubleBuffered

于 2012-05-09T00:42:46.477 回答
2

Another solution is to use a library that will double buffer for you. Since you are using Java2D I am assuming you want to keep everything pretty lightweight and lower level. I think Slick2D does a great job of providing simple, 2d drawing and input functions without getting in your way. It feels like a more elegant version of Java2D, but is written on OpenGL. Once you make a few applications with pure Java, I think moving to Slick2D is a GREAT idea. This is not a direct solution to your issue, but since it has already been solved I thought Id offer some advice that will make your Java game development life easier. Check it out if you get a chance http://slick.cokeandcode.com/

于 2012-05-09T23:52:49.357 回答
2

我认为您的问题不是双重缓冲。您必须super.paint(page);在您的绘画方法的第一行添加。

于 2012-05-09T00:37:43.813 回答