Java绘图在Jarame上的JPanel上 [英] Java drawing on JPanel which on a JFrame

问题描述

您好我有一个JFrame，并且它上面有两个JPanel。我的目的是利用JPanels。任何人都可以分享任何Java代码吗？

Hi I have a JFrame and there are two JPanels on top of it. My intention is to draw on the JPanels. Can anyone please share any Java code?

推荐答案

所有JComponents（JPanel继承自的）都有 paintComponent（Graphics g）可以覆盖的方法。

All the JComponents ( of which JPanel inherits from ) have a paintComponent(Graphics g ) method that you can override.

基本上......哦..好吧，我认为这会更合适：

Basically... oh.. well, I think this would be more appropiate:

http://java.sun.com/developer/technicalArticles/GUI/java2d/java2dpart1。 HTML

天真样本：

源代码：

    import javax.swing.*;
    import java.awt.*;
    import java.awt.geom.*;
    public class X  {
        public static void main( String [] args ) {
             JFrame frame = new JFrame();
             frame.add( new JPanel() {
                 public void paintComponent( Graphics g ) {
                    super.paintComponent(g);
                    Graphics2D g2 = (Graphics2D)g;

                    Line2D line = new Line2D.Double(10, 10, 40, 40);
                    g2.setColor(Color.blue);
                    g2.setStroke(new BasicStroke(10));
                    g2.draw(line);
                 }
            });
            frame.setVisible( true );
        }
    }

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