如何在Java中绘制实心圆？ [英] How to draw a filled circle in Java?

问题描述

我有一个带有网格布局的JPanel。在网格的单元格中，我可以放置不同的元素（例如JButtons）。这没有问题。但是现在我想在一些单元格中填充一个实心圆。我也想将ActionListener与这些圈子联系起来。更详细地说，如果我点击圆圈，它会从当前单元中消失，并出现在另一个单元格中。我怎样才能在Java中做到这一点？我使用Swing。

I have a JPanel with a Grid Layout. In the "cells" of the grid I can put different elements (for example JButtons). There is no problems with that. But now I want to put a filled circle in some of the cells. I also would like to relate an ActionListener with these circles. In more details, if I click the circle it disappears from the current cell and appears in another one. How can I do it in Java? I am using Swing.

推荐答案

public void paintComponent(Graphics g) {
   super.paintComponent(g);
   Graphics2D g2d = (Graphics2D)g;
   // Assume x, y, and diameter are instance variables.
   Ellipse2D.Double circle = new Ellipse2D.Double(x, y, diameter, diameter);
   g2d.fill(circle);
   ...
}

以下是一些关于paintComponent的文档（ link ） 。

Here are some docs about paintComponent (link).

您应该在您的JPanel中重写该方法，并执行与上面的代码片段类似的操作。

You should override that method in your JPanel and do something similar to the code snippet above.

你的ActionListener你应该指定 x，y，diameter 并且调用 repaint（）。

In your ActionListener you should specify x, y, diameter and call repaint().

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