一个用Java写的MVC模式的贪吃蛇

package snake; import javax.swing.*; import java.util.Arrays; import java.util.LinkedList; import java.util.Observable; import java.util.Random; /** * @author Lien * @since 2008/2/25 */ /** * MVC 中的Model 类,负责所有游戏相关数据及运行 */ public class SnakeModel extends Observable implements Runnable { boolean[][] matrix; //指示位置上有没蛇体或食物 LinkedList nodeArray = new LinkedList(); //蛇体 Node food; int maxX; int maxY; int direction = 2; //蛇运行的方向 boolean running = false; //运行状态 int timeInterval = 200; //时间间隔,毫秒 double speedChangeRate = 0.75; //每次的速度变化率 boolean paused = false; //暂停标志 int score = 0; //得分 int countMove = 0; //吃到食物前移动的次数 //UP and DOWN should be even //UP 和 DOWN 是双数 //RIGHT and LEFT should be odd //RIGHT 和 LEFT 是单数 public static final int UP = 2; public static final int DOWN = 4; public static final int LEFT = 1; public static final int RIGHT = 3; public SnakeModel(int maxX,int maxY){ this.maxX = maxX; this.maxY = maxY; reset(); } public void reset(){ direction = SnakeModel.UP; //蛇运行的方向 timeInterval = 200; //时间间隔,毫秒 paused = false; //暂停标志 score = 0; //得分 countMove = 0; //吃到食物前移动的次数 //初始化 matirx, 全部清 0 matrix = new boolean[maxX][]; for(int i = 0;i<maxX;++i){ matrix[i] = new boolean[maxY]; Arrays.fill(matrix[i], false); } //初始化蛇体,如果横向位置超过20个,长度为10,否则为横向位置的一半 int initArrayLength = maxX > 20? 10 : maxX/2; nodeArray.clear(); for(int i = 0;i<initArrayLength;i++){ int x = maxX/2+i; int y = maxY/2; nodeArray.addLast(new Node(x,y)); matrix[x][y] = true; } //创建食物 food = createFood(); matrix[food.x][food.y] = true; } public void changeDirection(int newDirection){ //改变的方向不能与原来方向同向或反向 if(direction % 2 != newDirection %2){ direction = newDirection; } } /** * 运行一次 */ public boolean moveOn(){ Node n = (Node)nodeArray.getFirst(); int x = n.x; int y = n.y; //根据方向增减坐标值 switch(direction){ case UP: y--; break; case DOWN: y++; break; case LEFT: x--; break; case RIGHT: x++; break; } //如果新坐标在有效范围内,则进行处理 if((0<= x && x< maxX) && (0 <= y && y < maxY) ){ if(matrix[x][y]){ //如果新坐标的点上有东西(蛇体或食物) if(x == food.x && y == food.y){ //吃到食物,成功 nodeArray.addFirst(food); //从蛇头增长 //分数规则,与移动改变方向的次数和速度两个元素有关 int scoreGet = (1000 - 200 *countMove) / timeInterval; score += scoreGet > 0 ? scoreGet : 10; countMove = 0; food = createFood(); //创建新的食物 matrix[food.x][food.y] = true; //设置食物所在位置 return true; }else{ //吃到蛇体自身,失败 return false; } }else{ //如果新坐标的点上没有东西(蛇体),移动蛇体 nodeArray.addFirst(new Node(x,y) ); matrix[x][y] = true; n = (Node) nodeArray.removeLast(); matrix[n.x][n.y] = false; countMove++; return true; } } return false; //触到边线,失败, } public void run() { running = true; while(running){ try{ Thread.sleep(timeInterval); }catch(Exception e){ break; } if(!paused){ if(moveOn() ){ setChanged(); //Model 通知 View 数据已经更新 notifyObservers(); }else{ JOptionPane.showMessageDialog(null, "you failed", "Game Over", JOptionPane.INFORMATION_MESSAGE); break; } } } running = false; } private Node createFood(){ int x = 0; int y = 0; //随机获取一个有效区域内的与蛇体和食物不重叠的位置 do{ Random r = new Random(); x = r.nextInt(maxX); y = r.nextInt(maxY); }while(matrix[x][y]); return new Node(x,y); } public void speedUp(){ timeInterval *= speedChangeRate; } public void speedDown(){ timeInterval *= speedChangeRate; } public void changePauseState(){ paused = !paused; } public String toString(){ String result = ""; for(int i = 0;i < nodeArray.size();i++){ Node n = (Node) nodeArray.get(i); result += "[" + n.x + "," + n.y + "]"; } return result; } } class Node{ int x; int y; Node(int x,int y){ this.x = x; this.y = y; } }