ball_两球相撞_多次.java.txt

ball两球相撞 ball两球相撞多次 例程

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Ball extends JApplet {
	private OneBall blueBall, redBall;
	private boolean xUp,yUp,bouncing,start=false;
	private int x, y, xDx, yDy;
	private final int MAX_X=200, MAX_Y=200;
	private Color color;
	
	public void init(){
		xUp=false;
		yUp=false;
		xDx=1;
		yDy=1;	
		
		addMouseListener(
				new MouseListener(){
					public void mousePressed(MouseEvent event){
					showStatus("开始");
					creatBall(event);
					}
					public void mouseExited(MouseEvent event){}
					public void mouseClicked(MouseEvent event){}
					public void mouseReleased(MouseEvent event){}
					public void mouseEntered(MouseEvent event){}
				}//end new
				);
		setSize(MAX_X,MAX_Y);
				
	}//end init();
	
	private void creatBall(MouseEvent event){
		if(start==false){
			x=event.getX();
			y=event.getY();
			blueBall=new OneBall(x,y,xDx,yDy,MAX_X,MAX_Y,Color.blue,this);
			bouncing=true;
			blueBall.start();
			redBall=new OneBall(x,y,xDx,yDy,MAX_X,MAX_Y,Color.red,this);
			redBall.start();
			try{
				redBall.sleep(1000);
			}catch(InterruptedException e){
				System.err.println(e.toString());
			}
		}
	}//end creatball
	
	public void stop(){ blueBall=null;}
	
	public void paint(Graphics g){
		super.paint(g);
		if(bouncing){
			 x=blueBall.getX();
			 y=blueBall.getY();
			 color=blueBall.getColor();
			 g.setColor(color);
			 g.fillOval(x,y,20,20);
			 int x1=x,y1=y;
			 x=redBall.getX();
			 y=redBall.getY();
			 color=redBall.getColor();
			 g.setColor(color);
			 g.fillOval(x,y,20,20);
			 System.out.println("x:"+x+"x1:"+x1+"y:"+y+"y1:"+y1);
			 if(Math.abs(x-x1)<20&&Math.abs(y-y1)<20){
				 redBall.setBool(false);
				 blueBall.setBool(false); //两球相撞，则停止运行
				 showStatus("撞上了");
				 start=false;
				 
			 }			
		}
		
	}//end paint
	
}//end Class Ball