叶椭圆形步道 [英] oval leaves the trail

问题描述

我试图做一个简单的球的动画，从1边角开始，转到面板的另一个角落。我写了一个程序的。

I am trying to make a simple ball animation, that starts from 1 corner and goes to another corner of the panel. I have written a program for that.

当我运行程序的椭圆或球留下的踪迹。我的意思说的是，它的叶子是'颜色踪迹当程序运行时。在我的节目定时器触发一个事件每100毫秒。

When I run the program the oval or ball leaves the trail. What I mean to say is that it leaves it's 'color trail' when the program runs. In my program timer fires an event every 100 milliseconds.

以下是负责运行code逻辑：

void function() {
  // in this there is a action listener timed accordingly to fire event of 
  // doing x++ every 100th miliseconds
}

public void paintComponent(final Graphics g) {
 g.setColor(Color.black);
 g.drawOval(x,y,width,height);
 g.fillOval(x,y,width,height);
}

截屏输出：

推荐答案

尝试

public void paintComponent(final Graphics g) {
 super.paintComponent(g);

 g.setColor(Color.black);
 g.drawOval(x,y,width,height);
 g.fillOval(x,y,width,height);
}

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