循环重绘

发布于 2024-09-30 16:57:25 字数 401 浏览 6 评论 0原文

我正在使用 Java Swing 编写游戏。我想在每次循环执行时进行绘制，中间有一个小的延迟，以在屏幕上创建级联效果。我相信系统中的效率例程将对 repaint() 的调用折叠为单个调用。无论如何，在完全延迟之后，所有变化都会立即发生。有没有某种方法可以强制系统立即重新绘制，然后在循环的每次迭代上延迟？

我的代码：

for(int i=0;i<10;i++){
    JButton[i].setBackground(Color.WHITE);
    JButton[i].repaint();
    Thread.sleep(2000);
    JButton[i].setBackground(Color.GRAY);
    JButton[i].repaint();
}

原文

I am writing a game using Java Swing. I want to paint each time a loop executes with a small delay in between to create a cascade effect on screen. I believe that the efficiency routines in the system are collapsing the calls to repaint() into a single call. At any rate, the changes all occur at once after the total delay. Is there some way to force the system to repaint immediately and then delay on each iteration of the loop?

My Code:

for(int i=0;i<10;i++){
    JButton[i].setBackground(Color.WHITE);
    JButton[i].repaint();
    Thread.sleep(2000);
    JButton[i].setBackground(Color.GRAY);
    JButton[i].repaint();
}

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只涨不跌 2024-10-07 16:57:25

您可以使用JComponent.paintImmediately强制立即重绘。

编辑：再次阅读您的问题后，我发现您可能正在事件分派线程上执行逻辑。这意味着重绘请求只有在您的方法返回后才会执行。如果您将代码放入另一个线程中，那么这可能会解决问题，并且比使用 paintImmediately 好得多。

void uiFunction() {
    new Thread() {
        public void run() {
            for(int i = 0; i < 10; i++) {
                final JButton b = buttons[i];
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.WHITE);
                    b.repaint();
                }
                Thread.sleep(2000);
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.GRAY);
                    b.repaint();
                }
            }
        }
    }.run();
}

这有点混乱，但希望它能让您知道从哪里开始。

You can use JComponent.paintImmediately to force an immediate repaint.

EDIT: After reading your question again it occurs to me that you might be executing your logic on the event dispatch thread. This would mean that the repaint requests will not be executed until after your method returns. If you put your code into another thread then that will probably fix the problem and it will be a lot nicer than using paintImmediately.

void uiFunction() {
    new Thread() {
        public void run() {
            for(int i = 0; i < 10; i++) {
                final JButton b = buttons[i];
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.WHITE);
                    b.repaint();
                }
                Thread.sleep(2000);
                SwingUtilities.invokeLater(new Runnable() {
                    b.setBackground(Color.GRAY);
                    b.repaint();
                }
            }
        }
    }.run();
}

It's a bit mucky but hopefully it gives you an idea of where to begin.

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