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snake.html
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snake.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>HTML canvas</title>
<style type="text/css">
html,body{overflow:hidden;}
</style>
</head>
<body>
<canvas id="canvas" style="background:#eee;border:1px solid #ccc;">你的浏览器不支持canvas</canvas>
<script type="text/javascript">
var snake = {
config: {
width:50,
height:25,
pixel:10,
fps:3,
gameOver : false,
pause : false,
color : "#ef0f6e",
border: "#ffffff"
},
position : [ [2,0],[1,0],[0,0] ],
forward: [],
food:[],
//重画canvas
draw : function(){
this.ctx.clearRect(0,0,this.config.width*this.config.pixel,this.config.height*this.config.pixel);
var length = this.position.length;
//画蛇
for(var k = length - 1;k >= 0;k--){
this.drawDotted( this.position[k] );
}
//画食物
for(var k=0,kk=this.food.length;k<kk;k++){
this.drawDotted( this.food[k] );
}
},
//按键改变方向
changeDirection:function(){
var keyCode = this.keyCode || 39;
var forwardList = {
"37" : [-1,0],
"38" : [0,-1],
"39" : [1,0],
"40" : [0,1]
};
//防止逆行 和 重复按键
if( forwardList[keyCode] &&
(this.forward[0] != forwardList[keyCode][0]) &&
(this.forward[1] != forwardList[keyCode][1])
){
this.forward = forwardList[keyCode];
}
},
getPos: function(){
//前进中，除第一颗的算法
var length = this.position.length;
var last = [ this.position[length-1][0],this.position[length-1][1] ];
this.last = last;
this.length = length;
for(var k = length - 1;k >= 0;k--){
if(k){
this.position[k][0] = this.position[k-1][0];
this.position[k][1] = this.position[k-1][1];
}
};
//前进中，第一颗的算法
this.changeDirection();
this.position[0][0] += this.forward[0];
this.position[0][1] += this.forward[1];
},
eatFood: function(){
//吃到食物时，加长蛇，同时创建新的食物
for(var k=0,kk=this.food.length;k<kk;k++){
if( this.position[0][0] == this.food[k][0] &&
this.position[0][1] == this.food[k][1] ){
this.position.push( this.last );
this.createFood(k);
}
}
},
addLevel:function(){
//随着长度增加，同时增大运动的频率,在20和 40时还会出现两个食物
var level={
"7": [1,0], "11": [1,0], "14":[1,0],
"20":[1,1], "25": [1,0], "30":[1,0],
"40":[1,1], "50": [1,0], "70":[1,0],
"90":[1,0], "120":[1,0]
};
if( level[length]){
if( level[length][0] ){
this.config.fps+=level[length][0];
}
if( level[length][1] ){
this.createFood(this.food.length);
}
level[length] = false;
}
},
gameOver: function(){
//游戏结束的两种情况
for(var k = this.length - 1;k >= 0;k--){
if(k){
//头咬尾时，游戏结束
if( (this.position[0][0] == this.position[k][0]) &&
(this.position[0][1] == this.position[k][1]) ){
this.config.gameOver = true;
}
//头撞墙壁时，游戏结束
if( this.position[0][0] < 0 ||
this.position[0][1] < 0 ||
this.position[0][0] >= this.config.width ||
this.position[0][1] >= this.config.height){
this.config.gameOver = true;
}
}
}
if(this.config.gameOver){
alert("game over");
clearTimeout(this.timer);
location.reload();
}
},
//确定食物的坐标
createFood:function(key){
var r = function(n){
return Math.floor(Math.random()*n) + 1;
}
var x = r(this.config.width-1);
var y = r(this.config.height-1);
var length = this.position.length;
for(var k =0;k<length;k++){
if( x == this.position[k][0] &&
y == this.position[k][1] ){
createFood(key);
return;
}
}
this.food[key] = [x,y];
},
//画食物点和边框
drawDotted:function(pos){
this.ctx.fillRect( pos[0]*this.config.pixel, pos[1]*this.config.pixel,this.config.pixel,this.config.pixel );
this.ctx.strokeRect( pos[0]*this.config.pixel, pos[1]*this.config.pixel,this.config.pixel,this.config.pixel );
},
bindEvent: function(){
var that = this;
//绑定事件，实现暂停
document.onkeydown = function(e){
e = e || window.event;
var keyCode = e.keyCode;
if(keyCode == 32){
that.config.pause = !that.config.pause;
};
that.keyCode = keyCode;
}
},
next:function(){
if(this.config.pause){ return false;}
this.getPos();
this.gameOver();
this.eatFood();
this.addLevel();
this.draw();
},
init: function(id){
var that = this;
var canvas = document.getElementById(id);
canvas.width = this.config.width * this.config.pixel;
canvas.height = this.config.height * this.config.pixel;
that.ctx=canvas.getContext("2d");
var ctx = that.ctx;
ctx.fillStyle = this.config.color;
ctx.strokeStyle = this.config.border;
that.bindEvent();
that.createFood(0);
that.timer = setInterval( function(){that.next();}, 1000/that.config.fps );
}
}
snake.init("canvas");
</script>
</body>
</html>