如何使用摆动计时器开始/停止动画 [英] how to use a swing timer to start/stop animation

问题描述

有人可以教我如何使用 swing timer 用于以下目的:

Could someone teach me how to use a swing timer with the following purpose:

当我点击鼠标时，我需要一个多边形开始动画(简单的动画，如旋转)；并在我再次单击时停止动画.

I need to have a polygon that begins being animated(simple animation such as rotating) when I click the mouse; and stops animating when I click again.

我在理解 MouseListener 的工作方式方面没有问题，但是对于实际的动画.我尝试在 paint() 方法中使用 while 块模拟动画，我将在其中绘制、擦除和重绘多边形(例如模拟旋转)，但在 while 中，小程序不会听点击.它只会在一段时间后听.当我点击鼠标时，我需要摆动计时器来打破时间.

I do not have problems understanding the way the MouseListener works, but with the actual animation. I tried simulating the animation with a while block inside the paint() method where I would draw, erase and redraw the polygon(to simulate a rotation for example), but inside the while, the applet would not listen to the clicks. It would listen only after the while. I would need the swing timer to break the while when I click the mouse.

推荐答案

import javax.swing.Timer;

添加属性；

Timer timer; 
boolean b;   // for starting and stoping animation

将以下代码添加到框架的构造函数中.

Add the following code to frame's constructor.

timer = new Timer(100, new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent ae) {
        // change polygon data
        // ...

        repaint();
    }
});

覆盖paint(Graphics g)并从actionPerformed(e)修改的数据中绘制多边形.

Override paint(Graphics g) and draw polygon from the data that was modified by actionPerformed(e).

最后，开始/停止动画的按钮在其事件处理程序中有以下代码.

Finally, a button that start/stop animation has the following code in its event handler.

if (b) {
    timer.start();
} else {
    timer.stop();
}
b = !b;

这篇关于如何使用摆动计时器开始/停止动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！