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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>贪吃蛇</title> | |
| <style type="text/css"> | |
| *{margin:0;padding: 0;font-family: "Microsoft YaHei";} | |
| #page{margin-right: auto;margin-left: auto; margin-top: 20px;height: 600px; width: 980px; } | |
| #yard{ width: 800px;border: 1px solid gray;box-shadow: 0 0 10px black; float: right;} | |
| #mark{font-weight: 800;} | |
| #mark_con{ color: red; } | |
| button{width: 50px; } | |
| a{text-decoration:none;} | |
| </style> | |
| <script type="text/javascript"> | |
| //伪常量 | |
| var BLOCK_SIZE = 20; //格子大小 | |
| var COLS = 40; //列数 | |
| var ROWS = 30; //行数 | |
| //变量 | |
| var snakes = []; //保存蛇坐标 | |
| var c = null; //绘图对象 | |
| var toGo = 3; //行进方向 | |
| var snakecount = 4; //蛇身数量 | |
| var interval = null; //计时器 | |
| var foodX = 0; //食物X轴坐标 | |
| var foodY = 0; //食物Y轴坐标 | |
| var oMark = null; //分数显示框 | |
| var isPause = false; //是否暂停 | |
| // 绘图函数 | |
| function draw(){ | |
| c.clearRect(0,0,BLOCK_SIZE * COLS, BLOCK_SIZE * ROWS); | |
| //画出横线 | |
| for( var i = 1; i <= ROWS; i++ ) { | |
| c.beginPath(); | |
| c.moveTo(0, i * BLOCK_SIZE); | |
| c.lineTo(BLOCK_SIZE * COLS, i * BLOCK_SIZE); | |
| c.strokeStyle = "gray"; | |
| c.stroke(); | |
| } | |
| //画出竖线 | |
| for(var i = 1; i <= COLS; i++){ | |
| c.beginPath(); | |
| c.moveTo(i * BLOCK_SIZE, 0); | |
| c.lineTo(i * BLOCK_SIZE, BLOCK_SIZE * ROWS); | |
| c.stroke(); | |
| } | |
| //画出蛇 | |
| for (var i = 0; i < snakes.length; i++){ | |
| c.beginPath(); | |
| c.fillStyle = "green"; | |
| c.fillRect(snakes[i].x, snakes[i].y, BLOCK_SIZE, BLOCK_SIZE); | |
| c.moveTo(snakes[i].x, snakes[i].y); | |
| c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y); | |
| c.lineTo(snakes[i].x + BLOCK_SIZE, snakes[i].y + BLOCK_SIZE); | |
| c.lineTo(snakes[i].x, snakes[i].y + BLOCK_SIZE); | |
| c.closePath(); | |
| c.strokeStyle = "white"; | |
| c.stroke(); | |
| } | |
| //画出食物 | |
| c.beginPath(); | |
| c.fillStyle = "yellow"; | |
| c.fillRect(foodX, foodY, BLOCK_SIZE, BLOCK_SIZE); | |
| c.moveTo(foodX, foodY); | |
| c.lineTo(foodX + BLOCK_SIZE, foodY); | |
| c.lineTo(foodX + BLOCK_SIZE, foodY + BLOCK_SIZE); | |
| c.lineTo(foodX, foodY + BLOCK_SIZE); | |
| c.closePath(); | |
| c.strokeStyle = "red"; | |
| c.stroke(); | |
| } | |
| //游戏初始化 | |
| function start(){ | |
| for( var i = 0; i < snakecount; i++){ | |
| snakes[i] = {x: i * BLOCK_SIZE, y: 0}; | |
| } | |
| addFood(); | |
| draw(); | |
| oMark.innerHTML = 0; | |
| } | |
| //移动函数 | |
| function move(){ | |
| switch(toGo){ | |
| case 1: //左边 | |
| snakes.push({x: snakes[snakecount - 1].x - BLOCK_SIZE, y: snakes[snakecount - 1].y}); | |
| break; | |
| case 2: //上边 | |
| snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y - BLOCK_SIZE}); | |
| break; | |
| case 3: //右边 | |
| snakes.push({x: snakes[snakecount - 1].x + BLOCK_SIZE, y: snakes[snakecount - 1].y}); | |
| break; | |
| case 4: //下边 | |
| snakes.push({x: snakes[snakecount - 1].x, y: snakes[snakecount - 1].y + BLOCK_SIZE}); | |
| break; | |
| default:; | |
| } | |
| snakes.shift(); | |
| isEat(); | |
| isDie(); | |
| draw(); | |
| } | |
| //吃到食物判断 | |
| function isEat(){ | |
| if (snakes[snakecount - 1].x == foodX && snakes[snakecount - 1].y == foodY) { | |
| oMark.innerHTML = (parseInt(oMark.innerHTML) + 1).toString(); | |
| addFood(); | |
| addSnake(); | |
| } | |
| } | |
| //添加蛇身 | |
| function addSnake(){ | |
| snakecount++; | |
| snakes.unshift({x:BLOCK_SIZE * COLS, y:BLOCK_SIZE * ROWS}); | |
| } | |
| //交互响应函数 | |
| function keydown(keyCode){ | |
| switch(keyCode){ | |
| case 37: //左边 | |
| if(toGo != 1 && toGo != 3) toGo = 1;break; | |
| case 38: //上边 | |
| if(toGo != 2 && toGo != 4) toGo = 2;break; | |
| case 39: //右边 | |
| if(toGo != 3 && toGo != 1) toGo = 3;break; | |
| case 40: //下的 | |
| if(toGo != 4 && toGo != 2) toGo = 4;break; | |
| case 80: //开始/暂停 | |
| if(isPause){ | |
| interval = setInterval(move,100); | |
| isPause = false; | |
| document.getElementById(‘pause‘).innerHTML = "Pause"; | |
| }else{ | |
| clearInterval(interval); | |
| isPause = true; | |
| document.getElementById(‘pause‘).innerHTML = "Start"; | |
| } | |
| break; | |
| } | |
| } | |
| //制造食物 | |
| function addFood(){ | |
| foodX = Math.floor(Math.random() * (COLS - 1)) * BLOCK_SIZE; | |
| foodY = Math.floor(Math.random() * (ROWS - 1)) * BLOCK_SIZE; | |
| // console.log(foodX + " -- " + foodY); | |
| } | |
| //死亡判断 | |
| function isDie(){ | |
| if(snakes[snakecount - 1].x == -20 || snakes[snakecount - 1].x == BLOCK_SIZE * COLS | |
| || snakes[snakecount - 1].y == -20 || snakes[snakecount - 1].y == BLOCK_SIZE * ROWS){ | |
| alert("Game Over!"); | |
| clearInterval(interval); | |
| } | |
| for(var i = 0; i < snakecount - 1; i++){ | |
| if(snakes[snakecount - 1].x == snakes[i].x && snakes[snakecount - 1].y == snakes[i].y){ | |
| clearInterval(interval); | |
| alert("Game Over!"); | |
| } | |
| } | |
| } | |
| // 启动函数 | |
| window.onload = function(){ | |
| c = document.getElementById(‘canvas‘).getContext(‘2d‘); | |
| oMark = document.getElementById(‘mark_con‘); | |
| start(); | |
| interval = setInterval(move,100); | |
| document.onkeydown = function(event){ | |
| var event = event || window.event; | |
| keydown(event.keyCode); | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <div id="page"> | |
| <div id="yard"><canvas id="canvas" height="600px" width="800px"></canvas></div> | |
| <div id="help"> | |
| <div id="mark">得分：<span id="mark_con"></span></div> | |
| <div id="helper"> | |
| <table> | |
| <tr> | |
| <td></td> | |
| <td><button onclick="keydown(38);">上</button></td> | |
| <td></td> | |
| </tr> | |
| <tr> | |
| <td><button onclick="keydown(37);">左</button></td> | |
| <td><button onclick="keydown(80);" id="pause">暂停</button></td> | |
| <td><button onclick="keydown(39);">右</button></td> | |
| </tr> | |
| <tr> | |
| <td></td> | |
| <td><button onclick="keydown(40);">下</button></td> | |
| <td></td> | |
| </tr> | |
| </table><a href="index.html">再玩一次</a> | |
| </div> | |
| </div> | |
| </div> | |
| <div style="text-align:center;"> | |
| </div> | |
| </body> | |
| </html> |
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原文地址：http://www.cnblogs.com/dakaceng/p/5463262.html
