祝大家国庆节快乐
上面是用java的JFrame为基础实现的效果，下面用面向对象的思考分析并实现此效果：
1)找对象
最开始鼠标点击冲出来的白色圆点 Bullet
白色圆点爆炸成一片(包含很多小圆点)Piece
主程序类 Guoqing 继承于 JPanel
程序初始化类执行类GuoqingStart继承于JFrame
2) 类的设计, 定义出 类属性(数据模型)
比如
白色圆点类Bullet
|– int x x坐标
|– int y y坐标
3) 界面绘制(利用Java Swing API 绘制界面）
4) 功能算法设计
原则: 一切功能 都是方法: 动词就是方法
实现策略: 将功能映射到数学模型, 研究数据的变化规律
比如*白色圆点类*Bullet与*Piece中各个小圆点的移动，其实都是坐标位置的变化
5) 事件绑定(利用Java Swing API 实现事件绑定)
比如鼠标点击监听事件
6)完整代码
import java.awt.*;import java.awt.event.*;import java.util.*;import javax.swing.*;public class GuoqingStart extends JFrame { Guoqing gq; public static void main(String[] args) { new GuoqingStart(); } public GuoqingStart() { gq=new Guoqing(); this.addMouseListener(gq); this.add(gq); new Thread(gq).start(); this.setTitle("国庆快乐"); this.setLocation(100, 0); this.setSize(1000,700); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); }}class Guoqing extends JPanel implements MouseListener,Runnable{ Bullet bullet; Vector<Bullet> bullets; static Vector<Piece> pieces; int times=1; public Guoqing() { bullets=new Vector<Bullet>(); pieces=new Vector<Piece>(); } public void paint(Graphics g) { super.paint(g); times++; g.setColor(Color.black); g.fillRect(0, 0, 2000, 1000); g.setColor(Color.lightGray); for(int i=0;i<this.bullets.size();i++){ Bullet b=this.bullets.get(i); if(b.isLive){ b.move(); g.fillOval(b.x,b.oldY, 15, 15); } } for(int i=0;i<this.pieces.size();i++){ Piece b=this.pieces.get(i); if(b.isLive){ if(b.color==0){ g.setColor(Color.red); }else if(b.color==1){ g.setColor(Color.blue); }else if(b.color==2){ g.setColor(Color.cyan); }else if(b.color==3){ g.setColor(Color.green); }else{ g.setColor(Color.gray); } if(times%3==0){ b.move(); } g.fillOval((int)b.x, (int)b.y, (int)b.w, (int)b.h); } } } public void mousePressed(MouseEvent e) { bullet=new Bullet(e.getX(),e.getY()); this.bullets.add(bullet); } public void mouseClicked(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} @Override public void run() { while(true){ this.repaint(); try { Thread.sleep(20); } catch (Exception e) { e.printStackTrace(); } } }}class Piece{ double x,y; double w=15; double h=15; double velocityX, velocityY; boolean isLive=true; int color=0; int times=1; public Piece(double x,double y,double velocity,double angle,int color) { this.x=x; this.y=y; this.color=color; velocityX = velocity * Math.cos(angle); velocityY = velocity * Math.sin(angle); } public void move(){ velocityX *= 0.75; velocityY += 1.0; velocityY *= 0.75; y += velocityY; x += velocityX; times++; if(times%7==0){ this.w-=2; this.h-=2; if(this.w<=4){ Guoqing.pieces.remove(this); } } }}class Bullet{ int x; int y; int oldY=700; boolean isLive=true; Piece piece; Random r=new Random(System.currentTimeMillis()); public Bullet(int x, int y) { this.x = x; this.y = y; } public void move(){ oldY-=8; if(oldY<=y){ this.isLive=false; int color=r.nextInt(4); for(int i=0;i<200;i++){ double angleXy = r.nextDouble() * 2 * Math.PI; double angleZ = r.nextDouble() * 2 * Math.PI; double velocity = 72 * Math.cos(angleZ); piece=new Piece(x,oldY,velocity, angleXy,color); Guoqing.pieces.add(piece); } } }}
