简易画板—画直线version1.0

package drawLine;
/**
?* @author FlyingFire
?* @date:2011-6-1 下午04:44:47

?* @summary：画板窗口最小化以后，所有的直线全部消失
?*/
public class DrawUI extends javax.swing.JFrame{
?java.awt.Graphics g;
?UIListener listener;
?public void showUI(){
??this.setTitle("简易画板");
??this.setSize(600,500);
??this.setLocationRelativeTo(null);
??this.setDefaultCloseOperation(3);
??this.setVisible(true);
??g=this.getGraphics();
??listener=new UIListener(g);
??this.addMouseListener(listener);
?}
?public void paint(){
??System.out.println("listener");
??for(int i=0;i<listener.list.size();i++){
???g.drawLine(listener.list.get(i).x1,listener.list.get(i).y1,listener.list.get(i).x2,listener.list.get(i).y2);
??}
?}
public static void main(String a[]){
?DrawUI dui=new DrawUI();
?dui.showUI();
?dui.paint();
}
}

*********************************************************

package drawLine;

public class LinePointers {
?
??? public int x1;
??? public int y1;
??? public int x2;
??? public int y2;
?public LinePointers(int x1,int y1,int x2,int y2){
?
??this.x1=x1;
??this.y1=y1;
??this.x2=x2;
??this.y2=y2;
?}
}

****************************************************

package drawLine;

import java.awt.event.MouseEvent;

public class UIListener extends java.awt.event.MouseAdapter{
?java.util.ArrayList<LinePointers> list=new java.util.ArrayList<LinePointers>();
?
?private java.awt.Graphics g;
?private int x1,y1,x2,y2;
?private int countClick=1;
?public UIListener(java.awt.Graphics g){
??this.g=g;
?}
? public void mouseClicked(MouseEvent e) {
?? System.out.println("监听了");
?? if(countClick==1){
??? x1=e.getX();
??? y1=e.getY();
??? countClick++;
??? System.out.println(x1+"x1------y1"+y1);
?? }
?? else{
??? x2=e.getX();
??? y2=e.getY();
??? System.out.println(x2+"x2------y2"+y2);
??? g.drawLine(x1, y1, x2, y2);
??? countClick=1;
??? LinePointers twoPoints=new LinePointers(x1,y1,x2,y2);
??? list.add(twoPoints);
?? }
??
??
? }
}