snake.java

java 贪吃蛇小游戏 项目 源码

package org.han.snake.entities;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;

import org.han.snake.SnakeListener.SnakeListener;
import org.han.snake.util.Global;

public class Snake {
	public static final int UP = -1;
	public static final int RIGHT = 2;
	public static final int DOWN = 1;
	public static final int LEFT = -2;
	private int oldDirection,newDirection;
	private Set<SnakeListener> listeners = new HashSet<SnakeListener>();//保存事件监听
	private LinkedList<Point> body = new LinkedList<Point>();
	private Point oldTail;
	private boolean life;
	
	public Snake() {
		init();
	}
	public void init(){
		int x = Global.WIDTH/2;
		int y = Global.HEIGHT/2;
		for(int i=0;i<5;i++){
			body.addLast(new Point(x--,y));
		}
		oldDirection = newDirection = RIGHT;
		life = true;
	}
	public void move(){
		//System.out.println("Snake is moving...");
		if(oldDirection + newDirection != 0){
			oldDirection = newDirection;
		}
		//1.去尾
		oldTail = body.removeLast();
		int x = body.getFirst().x;
		int y = body.getFirst().y;
		switch(oldDirection){
		case UP:
			y--;
			if(y<0){
				y = Global.HEIGHT-1;
			}
			break;
		case RIGHT:
			x++;
			if(x>Global.WIDTH){
				x = 0;
			}
			break;
		case DOWN:
			y++;
			if(y>Global.HEIGHT){
				y = 0;
			}
			break;
		case LEFT:
			x--;
			if(x<0){
				x = Global.WIDTH-1;
			}
			break;
			
		}
		//2.加头
		Point newHead = new Point(x,y);
		body.addFirst(newHead);
		
	}
	public void eatFood(){
		//System.out.println("Snake eat food.");
		body.addLast(oldTail);
	}
	public boolean isEatBody(){
		for(int i=1;i<body.size();i++){
			//if(body.get(i).equals(this.getHead()))
			if(body.get(i).x == body.getFirst().x && body.get(i).y == body.getFirst().y)
				return true;
		}	
		return false;
	}
	public void changeDirection(int direction){
		//System.out.println("snake is changeDirection");
			newDirection = direction;
		
	}
	
	public void drawMe(Graphics g){
		if(Global.SCORE<180){
			g.setColor(Color.LIGHT_GRAY);
		}else if(Global.SCORE>=180&&Global.SCORE<360){
			g.setColor(Color.PINK);
		}else if(Global.SCORE>=360&&Global.SCORE<540){
			g.setColor(Color.WHITE);
		}else if(Global.SCORE>=540&&Global.SCORE<720){
			g.setColor(Color.ORANGE);
		}else if(Global.SCORE>=720){
			g.setColor(Color.BLACK);
		}
	
		for(Point p : body){
			g.fill3DRect(p.x*Global.CELL_SIZE, p.y*Global.CELL_SIZE,
					Global.CELL_SIZE, Global.CELL_SIZE, true);
		}
	}
	
	private class SnakeThread implements Runnable{
		public void run() {
			while(life){
				move();
				for(SnakeListener l : listeners){//遍历事件源
					l.SnakeMoved(Snake.this);
				}
				try {
					Thread.sleep(150-body.size()*2);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	public void start(){
		new Thread(new SnakeThread()).start();
	}
	public void addSnakeListener(SnakeListener l){//添加事件源
		if(l!=null){
			listeners.add(l);
		}
	}
	public Point getHead() {
		return body.getFirst();
	}
	public void die() {
		life = false;
		
	}
	public LinkedList<Point> getBody() {
		return body;
	}
}