Java弹球小游戏

package gui;

import javax.swing.JFrame;
import java.awt.BorderLayout;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.util.Random;
import java.awt.Color;
public class Stage5 extends Thread implements MouseListener
{
    JFrame jf=new JFrame("Bouncing Ball");           //window
    Pad p=new Pad();                                 //canvas to draw sth.
    Ball tmp=null;
    int size=450;                                    //default size of window
    int life=500;                                    //default simulation times
    int interval=100;                                //for thread sleep
    int max_r=25;                                    //the maximum radius of the ball
    int max_v=7;                                     //the maximum offset of the ball

    public Stage5()                                  //constructor
    {
        p.addMouseListener(this);
        jf.add(p,BorderLayout.CENTER);
        jf.setSize(this.size,this.size);
        jf.setVisible(true);        
    }
    
    public void run()                                 //for thread usage
    {
        for(int i=0;i<this.life;i++)
        {
            try{
                this.sleep(this.interval);
            }catch(InterruptedException e){}            
            p.updateBall();                           //update all balls' status
            p.update(p.getGraphics());                //repaint all balls
        }
        
    }
    
    public void mouseClicked(MouseEvent e){          //mouse action with canvas
        Color tmp=Color.red;
        switch(new Random().nextInt(4)){             //get random color
            case 0: tmp=Color.blue;break;
            case 1: tmp=Color.yellow;break;
            case 2: tmp=Color.green;break;            
        }
        p.insertBall(new Ball(                       //create a ball with random attributes, then insert it into queue.
            e.getX(),
            e.getY(),
            new Random().nextInt(this.max_r+3),
            tmp,
            this.max_v/2-new Random().nextInt(this.max_v),
            this.max_v/2-new Random().nextInt(this.max_v)
        ));
    }
    
    public void mouseExited(MouseEvent e){
        
    }
    
    public void mouseEntered(MouseEvent e){
        
    }
    
    public void mousePressed(MouseEvent e){
        
    }
    
    public void mouseReleased(MouseEvent e){
        
    }
    
    public static void main(String [] args)
    {
        Stage5 s=new Stage5();
        s.start();
    }
}

package gui;

import java.awt.Canvas;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.util.Vector;
public class Pad extends Canvas           //Pad become a canvas
{
    Vector queue=new Vector();            //queue is a place to contain all balls
    
    public Pad(){}                        //empty constructor
    
    public void insertBall(Ball b)        //function to add ball to queue
    {
        queue.add(b);
    }    
    
    public void updateBall()              //function to change ball's status
    {
        int x,y,xoff,yoff,s=queue.size(); //a set of temporary variables
        Ball tmp=null;
        for(int i=0;i<s;i++)
        {
             tmp=(Ball)queue.get(i);      //get one ball from queue
             x=tmp.getx();                //get the status of the ball
             y=tmp.gety();
             xoff=tmp.getxoff();
             yoff=tmp.getyoff();
             if((x+xoff)>400){            //if the ball reach the border change its direction,else change its location
                 tmp.setx(400-(x+xoff-400));
                 tmp.setxoff(0-xoff);
             }else if((y+yoff)>400){
                 tmp.sety(400-(y+yoff-400));
                 tmp.setyoff(0-yoff);
             }else if((x+xoff)<0){
                 tmp.setx(0-x-xoff);
                 tmp.setxoff(0-xoff);
             }else if((y+yoff)<0){
                 tmp.sety(0-y-yoff);
                 tmp.setyoff(0-yoff);
             }else{             
                 tmp.setx(x+xoff);                   
                 tmp.sety(y+yoff);
             }            
         }
    }
    
    public void paint(Graphics g)         //paint the graphic to canvas
    {
        this.update(g);
    }
    
    public void update(Graphics g)
    {
        Graphics2D g2 = (Graphics2D)g;
        g2.clearRect(0,0,450,450);
        Ball tmp=null;
        int s=queue.size();
        Ellipse2D m=null;
        for(int i=0;i<s;i++)              //draw balls in queue one by one
        {
            tmp=(Ball)queue.get(i);                                              //get a ball from queue
            m=new Ellipse2D.Float(tmp.getx(),tmp.gety(),tmp.getr(),tmp.getr());  //create an ellipse represents a ball shape
            g2.setPaint(tmp.getc());                                             //set the color
            g2.fill(m);                                                          //draw and fill the ellipse
        }
    }    
    
}

package gui;


import java.awt.Color;
public class Ball 
{
    private int x=0;     //coordinate x
    private int y=0;     //coordinate y
    private int r=5;     //radius
    private Color c=null;//color
    private int xoff=1;  //offset x
    private int yoff=1;  //offset y
    
    public Ball()        //constructor1 for default usage
    {
        x=0;
        y=0;
        r=5;
        c=Color.red;
        xoff=1;
        yoff=1;
    }
    
    public Ball(int x, int y, int r)          //constructor2
    {
        this.x=x;
        this.y=y;
        this.r=r;
        c=Color.red;
        xoff=1;
        yoff=1;
    }
    
    public Ball(int x, int y, int r, Color c,int xoff,int yoff)   //constructor3
    {
        this.x=x;
        this.y=y;
        this.r=r;
        this.c=c;
        this.xoff=xoff;
        this.yoff=yoff;
    }
    
    public int getx()
    {
        return this.x;
    }
    
    public int gety()
    {
        return this.y;
    }
    
    public int getr()
    {
        return this.r;
    }
    
    public Color getc()
    {
        return this.c;
    }
        
    public int getxoff()
    {
        return this.xoff;
    }
    
    public int getyoff()
    {
        return this.yoff;
    }
    
    public void setx(int x)
    {
        this.x=x;
    }
    
    public void sety(int y)
    {
        this.y=y;
    }
    
    public void setr(int r)
    {
        this.r=r;
    }
    
    public void setc(Color c)
    {
        this.c=c;
    }  
    
    public void setxoff(int xoff)
    {
        this.xoff=xoff;
    }
    
    public void setyoff(int yoff)
    {
        this.yoff=yoff;
    }
}