Java 中简单画图代码

package com.njust.JunH.JavaStart;


import java.awt.*;
import java.awt.geom.*;


import javax.swing.*;


public class DrawTest {


/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
// EventQueue.invokeLater(new Runnable(){
// public void run(){
// DrawFrame frame = new DrawFrame();
// frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// frame.setVisible(true);
// }
// });

DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}


}


class DrawFrame extends JFrame {
public DrawFrame(){
super.setTitle("DrawFrame");
super.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
DrawComponent component = new DrawComponent();
super.add(component);
}

public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 400;
}


class DrawComponent extends JComponent {
public void paintComponent(Graphics g){ //Graphics g 类似于VC++中的 CDC *pDC
//在这里画你想画的图形
Graphics2D g2 = (Graphics2D)g;
//draw a rectangle
double leftx = 100;
double lefty = 100;
double width = 200;
double height = 150;

Rectangle2D rect = new Rectangle2D.Double(leftx, lefty, width, height);
//g2.setColor(Color.RED);
g2.setPaint(Color.RED);
g2.draw(rect);
g2.setColor(SystemColor.textHighlight);

//draw the enclosed ellipse
Ellipse2D ellipse = new Ellipse2D.Double(leftx, lefty, width, height);
g2.draw(ellipse);

//draw a diagnal line

g2.setPaint(new Color(123, 213, 83));
g2.draw(new Line2D.Double(leftx, lefty, leftx+width, lefty+height));

//draw a circle with the same center
double centerX = rect.getCenterX();
double centerY = rect.getCenterY();
double radius = 150;

Ellipse2D circle = new Ellipse2D.Double();
circle.setFrameFromCenter(centerX, centerY, centerX+radius,  centerY+radius);
g2.draw(circle);

g2.setPaint(new Color(250, 250, 250));
g2.setFont(new Font("Serif", Font.BOLD, 14));
g2.drawString("Jun.H love Shuang.W forever!!!", 100, 360);

}
}