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 center double 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); } }