j2me 贪吃蛇源码

import java.util.*; import javax.microedition.lcdui.*; /** * 贪吃蛇游戏 */ public class SnakeCanvas extends Canvas implements Runnable{ /**存储贪吃蛇节点坐标,其中第二维下标为0的代表x坐标，第二维下标是1的代表y坐标*/ int[][] snake = new int[200][2]; /**已经使用的节点数量*/ int snakeNum; /**贪吃蛇运动方向,0代表向上，1代表向下,2代表向左,3代表向右*/ int direction; /**离屏画布*/ Graphics offG; /**离屏画笔*/ Image offImage; /*移动方向*/ /**向上*/ final int DIRECTION_UP = 0; /**向下*/ final int DIRECTION_DOWN = 1; /**向左*/ final int DIRECTION_LEFT = 2; /**向右*/ final int DIRECTION_RIGHT = 3; /**游戏区域宽度*/ int width; /**游戏区域高度*/ int height; /**蛇身单元宽度*/ private final byte SNAKEWIDTH = 8; /**是否处于暂停状态,true代表暂停*/ boolean isPaused = false; /**是否处于运行状态,true代表运行*/ boolean isRun = true; /**时间间隔*/ private final int SLEEP_TIME = 300; /**食物的X坐标*/ int foodX; /**食物的Y坐标*/ int foodY; /**食物的闪烁控制*/ boolean b = true; /**列数，行数*/ int col,row; Random random = new Random(); public boolean gameLost; public SnakeCanvas() { gameLost = false; //初始化节点数量 snakeNum = 7; //初始化节点数据 for(int i = 0;i < snakeNum;i++){ snake[i][0] = SNAKEWIDTH*7 - SNAKEWIDTH * i; snake[i][1] = SNAKEWIDTH *5; } //初始化移动方向 direction = DIRECTION_RIGHT; //初始化食物坐标 foodX = SNAKEWIDTH*7; foodY = SNAKEWIDTH*7; width = this.getWidth(); height = this.getHeight()-16; col = width/8; row = height/8; offImage = Image.createImage(this.getWidth(), this.getHeight()); offG = offImage.getGraphics(); //启动线程 new Thread(this).start(); } protected void paint(Graphics g) { drawBg(offG); //绘制蛇身 for(int i = 0;i < snakeNum;i++){ offG.fillRect(snake[i][0],snake[i][1],SNAKEWIDTH,SNAKEWIDTH); } //绘制食物 if(b){ offG.fillRect(foodX,foodY,SNAKEWIDTH,SNAKEWIDTH); } offG.drawString("开始 退出", 0, height, 0); if(gameLost){ offG.drawString("游戏失败", 60, height, 0); } g.drawImage(offImage, 0, 0, 0); } //画背景 private void drawBg(Graphics g){ //清屏 g.setColor(0xffffff); g.fillRect(0,0,width,height); g.setColor(0); //画单元格子 for(int i=0; i<row+1; i++){ g.drawLine(0, i*SNAKEWIDTH, width, i*SNAKEWIDTH); } for(int j=0; j<col; j++){ g.drawLine(j*SNAKEWIDTH, 0, j*SNAKEWIDTH, height); } } private synchronized void move(int direction){ //蛇身移动 for(int i = snakeNum - 1;i > 0;i--){ snake[i][0] = snake[i - 1][0]; snake[i][1] = snake[i - 1][1]; } //第一个单元格移动 switch(direction){ case DIRECTION_UP: snake[0][1] = snake[0][1] - SNAKEWIDTH; break; case DIRECTION_DOWN: if(snake[0][1] < height- SNAKEWIDTH){ snake[0][1] = snake[0][1] + SNAKEWIDTH; }else{ snake[0][1] = snake[0][1] +1; } break; case DIRECTION_LEFT: snake[0][0] = snake[0][0] - SNAKEWIDTH; break; case DIRECTION_RIGHT: if(snake[0][0] < width- SNAKEWIDTH){ snake[0][0] = snake[0][0] + SNAKEWIDTH; }else{ snake[0][0] = snake[0][0] +1; } break; } } /** * 吃掉食物，自身增长 */ private void eatFood(){ //判别蛇头是否和食物重叠 if(snake[0][0] == foodX && snake[0][1] == foodY){ snakeNum++; generateFood(); } } /** * 产生食物 * 说明：食物的坐标必须位于屏幕内，且不能和蛇身重合 */ private void generateFood(){ while(true){ foodX = Math.abs(random.nextInt() % (width - SNAKEWIDTH + 1)) / SNAKEWIDTH * SNAKEWIDTH; foodY = Math.abs(random.nextInt() % (height - SNAKEWIDTH + 1)) / SNAKEWIDTH * SNAKEWIDTH; boolean b = true; for(int i = 0;i < snakeNum;i++){ if(foodX == snake[i][0] && snake[i][1] == foodY){ b = false; break; } } if(b){ break; } } } /** * 判断游戏是否结束 * 结束条件： * 1、蛇头超出边界 * 2、蛇头碰到自身 */ private boolean isGameOver(){ //边界判别 if(snake[0][0] < 0 || snake[0][0] > (width - SNAKEWIDTH) || snake[0][1] < 0 || snake[0][1] > (height - SNAKEWIDTH)){ gameLost = true; return true; } //碰到自身 for(int i = 4;i < snakeNum;i++){ if(snake[0][0] == snake[i][0]&& snake[0][1] == snake[i][1]){ gameLost = true; return true; } } return false; } /** * 事件处理 */ public void keyPressed(int keyCode){ int action = this.getGameAction(keyCode); if(keyCode == -6){//重新开始 SnakeMIDlet.midlet.gameStart(); }else if(keyCode == -7){ SnakeMIDlet.midlet.gameExit(); } //改变方向 switch(action){ case UP: if(direction != DIRECTION_DOWN){ direction = DIRECTION_UP; } break; case DOWN: if(direction != DIRECTION_UP){ direction = DIRECTION_DOWN; } break; case LEFT: if(direction != DIRECTION_RIGHT){ direction = DIRECTION_LEFT; } break; case RIGHT: if(direction != DIRECTION_LEFT){ direction = DIRECTION_RIGHT; } break; case FIRE: //暂停和继续 isPaused = !isPaused; break; } } /** * 线程方法 * 使用精确延时 */ public void run(){ try{ while (isRun) { //开始时间 long start = System.currentTimeMillis(); if(!isPaused){ //吃食物 eatFood(); //移动 move(direction); //结束游戏 if(isGameOver()){ repaint(); break; } //控制闪烁 b = !b; } //重新绘制 repaint(); long end = System.currentTimeMillis(); //延时 if(end - start < SLEEP_TIME){ Thread.sleep(SLEEP_TIME - (end - start)); } } }catch(Exception e){} } }