画图板

package com032401;
例子：

import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;


public class DrawListener implements MouseListener{
    private double x1,x2,y1,y2;
   private int x,y;
   public static float a=1.7f,b=1.7f,c=0.06f,d=1.2f;
   
   Graphics g;

   public DrawListener(Graphics g){
		this.g=g;
	}
	

	public void mousePressed(MouseEvent e) {
		
	}

	public void mouseReleased(MouseEvent e) {
		System.out.print("ssss");
		this.Draw(e);
		}
		
	public void Draw(MouseEvent e){
			for(int i=0;i<500000;i++){
			x2=Math.sin(a*y1)+c*Math.cos(a*x1);
			y2=Math.sin(b*x1)+d*Math.cos(b*y1);
			x1=x2;
			y1=y2;
			x=(int)(x1*100)+500;
			y=(int)(y1*100)+400;
			g.drawLine(x, y, x, y);
		}	
	}
	

	public void mouseEntered(MouseEvent e) {
		
	}

	public void mouseExited(MouseEvent e) {
		
	}
	public void mouseClicked(MouseEvent e) {
		
	}
}



package com032401;

import java.awt.FlowLayout;
import java.awt.Graphics;

import javax.swing.JFrame;

import com032401.DrawBorder;
import com032401.DrawListener;

public class DrawBorder extends JFrame{
	//定义主函数
	public static void main(String[] args){
		//实例化DrawBorder类的对象
	DrawBorder db=new DrawBorder();
	//调用initUI函数
	db.initUI();	
	}
	//定义一个initUI函数
	public void initUI(){
		//设置属性值
		this.setTitle("");
		this.setSize(800, 900);
		this.setDefaultCloseOperation(3);
		this.setResizable(true);
		this.setLocationRelativeTo(null);
		this.setLayout(new FlowLayout());
		
	
		this.setVisible(true);
		 
		Graphics g=this.getGraphics();
		DrawListener d=new DrawListener(g);
		this.addMouseListener(d);
		
		
	}
}