原生JavaScript贪吃蛇
2013-12-16 11:15
405 查看
在实例开发过程中还是能认识到很多不足的，并且加强了一些基础。
简单写一下制作过程：
1.创建画布
2.创建蛇和老鼠 坐标不能重叠
3.让蛇移动起来
4.添加死亡方法
5.添加转点坐标和方向
6.添加吃老鼠的方法
整个开发的难点有几个：
1.蛇身体的转向
2.吃老鼠添加蛇长度
总结：
1.原来玩的FC贪吃蛇100合一的小游戏其实就是根据画布大小/蛇的移动速度/蛇的长度来设置关卡。
2.最后测试时老有个bug就是删除了最后的转点但是蛇尾没转过去，一直找不到原因，虽然最后修复了，但不是很满意。
在线测试地址：http://jsfiddle.net/dtdxrk/aL9DF/embedded/result/
简单写一下制作过程：
1.创建画布
2.创建蛇和老鼠 坐标不能重叠
3.让蛇移动起来
4.添加死亡方法
5.添加转点坐标和方向
6.添加吃老鼠的方法
整个开发的难点有几个：
1.蛇身体的转向
2.吃老鼠添加蛇长度
总结：
1.原来玩的FC贪吃蛇100合一的小游戏其实就是根据画布大小/蛇的移动速度/蛇的长度来设置关卡。
2.最后测试时老有个bug就是删除了最后的转点但是蛇尾没转过去，一直找不到原因，虽然最后修复了，但不是很满意。
在线测试地址：http://jsfiddle.net/dtdxrk/aL9DF/embedded/result/
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>贪吃蛇JavaScript版</title>
<style type="text/css">
*{margin:0;padding: 0;line-height: 1;}
body{font-family: Arial, 'Microsoft Yahei', Simsun, sans-serif;background-color: #7bef70;}
#con{width:400px;margin: 20px auto;}
#con span.r{float: right;}
#con h1{text-align: center;}
#Canvas{margin: 20px auto;background-color: #f4f9f5;overflow: hidden;}
#Canvas table{width: 100%;border:2px solid #000;border-collapse: collapse;}
#Canvas table td{border-collapse: collapse;border:1px solid #bfcde9;width: 8px;height: 8px;}
#Canvas table td.SnakeBody{background-color: #82f170}
#Canvas table td.SnakeHead{background-color: #4ca72e;}
#Canvas table td.Mouse{background-color: red;}
/*#Canvas table td.SnakeBody, #Canvas table td.SnakeHead, #Canvas table td.Mouse{border:1px solid #000;*border:0;}*/
</style>
</head>
<body>
<div id="con">
<h1>贪吃蛇JavaScript版</h1>
<div id="Canvas">
</div>
<div>
<span>分数：<i id="integral">0</i></span>
<span class="r">速度：<i id="speed">200</i></span>
</div>
</div>
<script type="text/javascript">
var Snake = {
time : "",
mapX : 40,
mapY : 40,
speed : 200,
mousePos : {}, //老鼠坐标
snakeStartPos : {"x":10,"y":20}, //蛇起始位置
snakeDirection : "Right", //起始方向
snakeLen : 5, //长度
snakeArr : [], //蛇身体的坐标
pointArr : [], //转点数组
$ : function(id){
return document.getElementById(id);
},
init : function(){
this.CreateMap();
this.CreateSnake();
this.CreateMouse();
document.onkeydown = this.keyDirection;
this.timer = setInterval(this.MoveSnake, this.speed);
},
CreateMap : function(){ //创建画布
var x = this.mapX,
y = this.mapY,
html = ["<table>"];
for(var i=0; i<y; i++){
html.push("<tr>");
for(var j=0; j<x; j++){
html.push("<td id='map_"+j+"_"+i+"'></td>");
}
html.push("</tr>");
}
html.push("</table>");
this.$("Canvas").innerHTML = html.join("");
},
CreateMouse : function(){ //创建老鼠
var x,y,id,
that = this,
getMouse = function(){
for(var i in that.snakeArr){
if(x==that.snakeArr[i]["x"] && y==that.snakeArr[i]["y"]){ //如果坐标与snake身体重叠重置
return random();
}
}
that.mousePos.x = x;
that.mousePos.y = y;
that.$("map_"+x+"_"+y).className = "Mouse";
},
random = function(){
x = Math.floor(Math.random()*(that.mapX-1));
y = Math.floor(Math.random()*(that.mapY-1));
getMouse();
};
random();
},
CreateSnake : function(){
var $ = this.$,
snakeArr = this.snakeArr,
snakeLen = this.snakeLen,
posX = this.snakeStartPos.x,
posY = this.snakeStartPos.y,
n = snakeLen + posX;
for(var i = posX; i<n; i++){
if(i==n-1){
$("map_"+i+"_"+posY).className = "SnakeHead";
}else{
$("map_"+i+"_"+posY).className = "SnakeBody";
}
snakeLen--;
snakeArr[snakeLen] = [];
snakeArr[snakeLen]["x"] = i;
snakeArr[snakeLen]["y"] = posY;
snakeArr[snakeLen]["d"] = this.snakeDirection;
}
},
MoveSnake : function(){
var body,
_d,
snakeLen = Snake.snakeLen,
snakeArr = Snake.snakeArr;
Snake.$('map_'+snakeArr[snakeLen-1]['x']+'_'+snakeArr[snakeLen-1]['y']).className = ""; //蛇尾去除css样式
for(var i=0,len =snakeLen; i<len; i++){
body = snakeArr[i];
if(i==0) {
Snake.$("map_"+body['x']+"_"+body['y']).className = "SnakeBody";
}
_d = Snake.getPoint(body['x'],body['y']);
if(_d) body['d'] = _d; //获取转点改变蛇的方向
//bug 删除转点的时候蛇尾没有转过来
if(i==snakeLen-1 && Snake.pointArr.length>0) Snake.delPoint(body['x'],body['y']); //删除转点
switch(body['d']){
case "Left":
if(i==0)Snake.GameOver(body['x']-1,body['y']), Snake.eatMouse(body['x']-1,body['y']);
body['x']--;
break;
case "Up":
if(i==0)Snake.GameOver(body['x'],body['y']-1), Snake.eatMouse(body['x'],body['y']-1);
body['y']--;
break;
case "Right":
if(i==0)Snake.GameOver(body['x']+1,body['y']), Snake.eatMouse(body['x']+1,body['y']);
body['x']++;
break;
case "Down":
if(i==0)Snake.GameOver(body['x'],body['y']+1), Snake.eatMouse(body['x'],body['y']+1);
body['y']++;
break;
}
}
Snake.$("map_"+snakeArr[0]['x']+"_"+snakeArr[0]['y']).className = "SnakeHead";
},
GameOver : function(x,y){ //游戏结束
if(x<0 || y<0 || x>this.mapX-1 || y>this.mapY-1){ //超出边界
clearInterval(this.timer);
return alert("GameOver");
}
for(var i in this.snakeArr){ //碰到身体
if(x==this.snakeArr[i]['x'] && y==this.snakeArr[i]['y']){
clearInterval(this.timer);
return alert("GameOver");
}
}
},
keyDirection : function(event){ //键盘控制方向
var event = event || window.event,
key = event.which || event.keyCode,
_snakeDirection = Snake.snakeDirection,
pointArr = Snake.pointArr,
pointNum = pointArr.length,
snakeArr = Snake.snakeArr,
bool = true;
switch(key){
case 37:
if(_snakeDirection=="Left"){
bool = false;
}else{
Snake.snakeDirection="Left";
}
break;
case 38:
if(_snakeDirection=="Up"){
bool = false;
}else{
Snake.snakeDirection="Up";
}
break;
case 39:
if(_snakeDirection=="Right"){
bool = false;
}else{
Snake.snakeDirection="Right";
}
break;
case 40:
if(_snakeDirection=="Down"){
bool = false;
}else{
Snake.snakeDirection="Down";
}
break;
}
if(bool){
if(pointNum>0){
if(pointArr[pointNum-1]['x']!= snakeArr[0]['x'] || pointArr[pointNum-1]['y'] != snakeArr[0]['y']) Snake.CreatePoint();
}else{
Snake.CreatePoint();
}
}
},
CreatePoint : function(){ //创建转点
var pointArr = this.pointArr,
pointNum = pointArr.length;
pointArr[pointNum] = [];
pointArr[pointNum]['x'] = this.snakeArr[0]['x'];
pointArr[pointNum]['y'] = this.snakeArr[0]['y'];
pointArr[pointNum]['d'] = this.snakeDirection;
},
getPoint : function(x,y){
var _d = "",
pointArr = Snake.pointArr;
for(var i in pointArr){
if(x==pointArr[i]['x'] && y==pointArr[i]['y']){
_d = pointArr[i]['d'];
}
}
return _d;
},
delPoint : function(x,y){ //删除转点
var pointArr = Snake.pointArr;
if(x==pointArr[0]['x'] && y==pointArr[0]['y']){
var _a = Snake.snakeArr[Snake.snakeArr.length-2],
_b = Snake.snakeArr[Snake.snakeArr.length-1];
if(_a['x']==_b['x'] && _a['y']==_b['y']) _b['d']=_a['d'];
Snake.pointArr.shift();
}
},
eatMouse : function(x,y){
if(x==this.mousePos.x && y==this.mousePos.y){
var _x, _y,
_tail = this.snakeArr[this.snakeLen-1];
this.snakeArr[this.snakeLen]=[];
this.snakeArr[this.snakeLen]['x'] = _tail['x'];
this.snakeArr[this.snakeLen]['y'] = _tail['y'];
this.snakeArr[this.snakeLen]['d'] = _tail['d'];
this.snakeLen++;
this.speed-=5;
clearInterval(this.timer);
this.CreateMouse();
this.integral();
this.timer = setInterval(this.MoveSnake, this.speed);
}
},
integral : function(){
this.$("integral").innerHTML= Number(this.$("integral").innerHTML)+5;
this.$("speed").innerHTML=this.speed;
}
}
Snake.init();
</script>
</body>
</html>
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