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如何从/到JAVA的某个点增长/缩小圆圈?
原标题:How to grow/shrink a circle from/to a point in JAVA?

我最初先用一个圆开始, 当按下启动按钮时, 圆必须缩到一个点, 如果在此过程中按下停止按钮, 它应该停止收缩进程。 如果按下启动按钮, 它必须继续收缩 。

一旦它缩小到一个点,它必须长回到一个圆圈,当点击时按钮必须同样响应。

我不确定如何利用在JAVA开展的行动来实施《增长()和减少()》。

最佳回答

如果您使用 < a href=> http://docs.oracle.com/javase/tuative/ ui/overview/intro.html" rel=“nofollow” > Swing , 您可以像一个盒子一样绘制圆圈。 这意味着您可以更改圆圈的大小, 并用一个偏差将其划到中心, 并在同一位置 :

public Circle {

    private int x;
    private int y;
    private int size;

    public void paint(Graphics g) {
        g.drawOval(x + size/2, y + size/2, size, size);
    }

    public void grow(){
        size++;
    }

    public void shrink(){
        size--;
        size = Math.max(size,1);
    }

}
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