java 贪食蛇

一个简单的小游戏，写的比随意，看起来很乱，思路有以下几点：

1.键盘事件控制四个方向移动

2.定义Point类的集合points存放蛇身的位置信息，这里用Point类存放了每节身体的x,y坐标，最后在面板中统一画出

3.面板中重写paintComponent方法画图

4.利用线程，调用repaint放法不重画面板

关于蛇的移动，这里移动一步的方法是，向集合中添加当前移动方向上的下一个点作为蛇头的新坐标，并在集合中移除蛇尾坐标

程序如下：

package com.Sanke;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;import javax.swing.JFrame;
import javax.swing.JPanel;class SnakeClient extends JFrame{//定义蛇身节点位置集合List<Point> points = new ArrayList<Point>();//本想定义四个移动方向，但貌似没怎么用过private static final int UP=1;private static final int DOWN=2;private static final int LEFT=3;private static final int RIGHT=4;//当前方向private  int dir = UP;//四个布尔变量，用于判断蛇的移动方向private boolean left=false;private boolean right=false;private boolean up=false;private boolean down=false;//蛇的生命状态private boolean Live = true;//画图面板private myPanel pan;//奖励private Bonus bonus;public SnakeClient() {// TODO Auto-generated constructor stubinit();this.setSize(806,629);this.setResizable(false);this.setLocationRelativeTo(null);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);new myThread().start();}void init(){//初始蛇身为三个节点points.add(new Point(0,40));points.add(new Point(0,20));points.add(new Point(0,0));bonus=new Bonus();pan = new myPanel();this.add(pan);this.addKeyListener(new KeyMinotor());}//蛇的移动，在方向不变的情况下向单一方向移动void Move(){int x = points.get(points.size()-1).x;int y = points.get(points.size()-1).y;switch(dir){case UP: y-=20;break;case DOWN: y+=20;break;case LEFT: x-=20;break;case RIGHT: x+=20;break;}if(x<0) x = pan.getWidth()-20;if(x>=pan.getWidth()) x = 0;if(y>=pan.getHeight()) y = 0;if(y<0) y = pan.getHeight()-20;points.add(new Point(x, y));points.remove(0);//System.out.println(x+" "+y);}//检测蛇头是否碰撞到身体boolean hitBody(){//取蛇头位置信息int x = points.get(points.size()-1).x;int y = points.get(points.size()-1).y;//从蛇身开始遍历for(int i=0;i<points.size()-1;i++){Point p = points.get(i);if(x==p.x&&y==p.y) //头和身体坐标一样，说明发生碰撞{return true;}}return false;}//事件监听类class KeyMinotor extends KeyAdapter{@Overridepublic void keyPressed(KeyEvent e) {// TODO Auto-generated method stubsuper.keyPressed(e);int keycode=e.getKeyCode();switch(keycode){case KeyEvent.VK_UP: if(dir!=DOWN) up=true;break; //下次移动方向不能与当前方向相反case KeyEvent.VK_DOWN: if(dir!=UP)  down=true;break;case KeyEvent.VK_LEFT:  if(dir!=RIGHT) left=true;break;case KeyEvent.VK_RIGHT: if(dir!=LEFT) right=true;break;}//通过四个布尔型变量的值确定最后方向if(up&&!down&&!left&&!right) dir=UP;if(!up&&down&&!left&&!right) dir=DOWN;if(!up&&!down&&left&&!right) dir=LEFT;if(!up&&!down&&!left&&right) dir=RIGHT;//System.out.println(dir);}@Overridepublic void keyReleased(KeyEvent e) {// TODO Auto-generated method stubsuper.keyReleased(e);int keycode=e.getKeyCode();switch(keycode){case KeyEvent.VK_UP:  up=false;break;case KeyEvent.VK_DOWN:   down=false;break;case KeyEvent.VK_LEFT:   left=false;break;case KeyEvent.VK_RIGHT:  right=false;break;}}}
//自定义面板
class myPanel extends JPanel{@Overrideprotected void paintComponent(Graphics g) {// TODO Auto-generated method stubsuper.paintComponent(g);Graphics2D g2 = (Graphics2D) g;if(Live){//画蛇for(Point point:points){int x=(int)point.getX();int y=(int)point.getY();g2.fillOval(x, y, 20, 20);}g2.drawString("当前长度："+points.size(), 5, 13);//移动一步Move();//构造蛇头的rectangle对象//System.out.println(points.get(points.size()-1).x+"  "+points.get(points.size()-1).y);Rectangle rec = new Rectangle(points.get(points.size()-1).x,points.get(points.size()-1).y,20,20);if(bonus.getRec().intersects(rec))//检测蛇头是否吃到奖励//	if(points.get(points.size()-1).x==bonus.getX()&&points.get(points.size()-1).y==bonus.getY()){int x = bonus.getX();int y = bonus.getY();switch(dir){case UP: y-=20;break;case DOWN: y+=20;break;case LEFT: x-=20;break;case RIGHT: x+=20;break;}//吃到奖励蛇身加1points.add(new Point(x,y));//奖励消失bonus.setLive(false);}//判断碰撞if(hitBody()){//发生碰撞，蛇的生命状态设为falseLive = false;}//画奖励bonus.draw(g2);//	System.out.println(pan.getWidth()+" "+pan.getHeight());}else {g2.setFont(new Font("楷体", Font.BOLD, 30));g2.setColor(Color.RED);g2.drawString("GAME　OVER！", 300, 300);}}
}
//自定义线程
class myThread extends Thread{@Overridepublic void run() {// TODO Auto-generated method stub//super.run();while(true){//调用repaint方法可重画面板repaint();try {//线程休眠this.sleep(200);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
}
class Bonus{private int x=300;private int y=300;private boolean Live = true;private Random ran = new Random();public Bonus() {// TODO Auto-generated constructor stub}public void draw(Graphics2D g){if(!this.isLive())//如果奖励的状态值为false{//给奖励点重新赋坐标值x=ran.nextInt(pan.getWidth());y=ran.nextInt(pan.getHeight());//坐标对20取整x=x/20*20;y=y/20*20;if(x==pan.getWidth()) x-=20;if(x<0) x+=20;if(y==pan.getHeight()) y-=20;if(y==0) y+=20;System.out.println(x+" "+y);this.setLive(true);}g.setPaint(Color.RED);g.fillOval(x, y, 20, 20);}//返回蛇身的rectangle对象public Rectangle getRec(){return new Rectangle(x,y,20,20);}public boolean isLive() {return Live;}public void setLive(boolean live) {Live = live;}public int getX() {return x;}public int getY() {return y;}}
//主方法public static void main(String[] args) {new SnakeClient();}
}

//运行效果：