20100917_Dawning_绘制图画

package com.swing.demo;import java.awt.EventQueue;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.geom.Ellipse2D;import java.awt.geom.Line2D;import java.awt.geom.Rectangle2D;import javax.swing.JComponent;import javax.swing.JFrame;/*** * * 绘制图画 * * @author Dawning * */public class DrawTest {public static void main(String[] args){EventQueue.invokeLater(new Runnable(){public void run() {DrawFrame frame = new DrawFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}});}}class DrawFrame extends JFrame{public DrawFrame(){setTitle("DarwTest");setSize(400,400);//设置窗体加载时的位置setLocation(300,100);DrawComponent component = new DrawComponent();add(component);}}class DrawComponent extends JComponent{protected void paintComponent(Graphics g) {Graphics2D g2 = (Graphics2D)g;double leftX = 100 ; double topY = 100;double width = 200;double height = 150;//draw a rectangle【长方形rectangle】Rectangle2D rect = new Rectangle2D.Double(leftX,topY,width,height);g2.draw(rect);//draw the enclosed ellipse 【椭圆ellipse】Ellipse2D ellipse = new Ellipse2D.Double();//设置椭圆的框架存放到rectangle中ellipse.setFrame(rect);//绘制到图形中g2.draw(ellipse);//draw a digonal line g2.draw(new Line2D.Double(leftX,topY,leftX + width,topY + height));//draw a circle with the same centerdouble centerX = rect.getCenterX();double centerY = rect.getCenterY();double radius = 100;Ellipse2D circle = new Ellipse2D.Double();circle.setFrameFromCenter(centerX,centerY,centerX + radius,centerY + radius);g2.draw(circle);circle = new Ellipse2D.Double();circle.setFrameFromCenter(centerX,centerY ,centerX + radius+5, centerY-30 + radius-30);g2.draw(circle);circle = new Ellipse2D.Double();circle.setFrameFromCenter(centerX,centerY,centerX + radius + 50, centerY + radius + 50);g2.draw(circle);}}