canvas的贪吃蛇。

第一次写canvas ...demo:http://xiaobude.com/app/snake
<!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 贪吃蛇</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,请升级你的浏览器</canvas>
<br /><span style="color:#ccc;font-family:Arial;font-size:12px;">laidezhong(at)gmail.com</span><script type="text/javascript">var setting = {
width:50,
height:25,
pixel:10,
fps:3,
gameOver : false,
paush : false,
color : "#ef0f6e",
border: "#ffffff",
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]
}
};var snake = {
position : [ [2,0],[1,0],[0,0] ],
keyCode:39,
forward:[],
food:[],
draw : function(){
ctx.clearRect(0,0,setting.width*setting.pixel,setting.height*setting.pixel)
var length = this.position.length;
for(var k = length - 1;k >= 0;k--){
this.drawDotted( this.position[k] );
}
for(var k=0,kk=this.food.length;k<kk;k++){
this.drawDotted( this.food[k] );
}
},
next:function(){
var keyCode = snake.keyCode;
var forwardList = {
"37" : [-1,0],
"38" : [0,-1],
"39" : [1,0],
"40" : [0,1]
};
if( forwardList[keyCode] && snake.forward[0] != forwardList[keyCode][0] && snake.forward[1] != forwardList[keyCode][1] ) snake.forward = forwardList[keyCode];
var length = this.position.length;
var last = [ this.position[length-1][0],this.position[length-1][1] ];
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];
}
};
this.position[0][0] += this.forward[0];
this.position[0][1] += this.forward[1];
for(var k = length - 1;k >= 0;k--){
if(k){
if( this.position[0][0] == this.position[k][0] && this.position[0][1] == this.position[k][1] )setting.gameOver = true;
if( this.position[0][0] < 0 || this.position[0][1] < 0 || this.position[0][0] >= setting.width || this.position[0][1] >= setting.height)setting.gameOver = true;
}
}
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( last );
this.createFood(k);
}
}
if( setting.level[length]){
if( setting.level[length][0] )setting.fps+=setting.level[length][0];
if( setting.level[length][1] ){
this.createFood(this.food.length)
}
setting.level[length] = false;
}
},
createFood:function(key){
var r = function(n){
return parseInt(Math.random()*n) + 1;
}
var x = r(setting.width-1);
var y = r(setting.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];
},
drawDotted:function(pos){
ctx.fillRect( pos[0]*setting.pixel, pos[1]*setting.pixel,setting.pixel,setting.pixel );
ctx.strokeRect( pos[0]*setting.pixel, pos[1]*setting.pixel,setting.pixel,setting.pixel );
}
}document.body.onkeydown = function(e){
e = e || window.event;
var keyCode = e.keyCode;
if(keyCode == 32){
setting.paush = !setting.paush;
return;
};
snake.keyCode = keyCode;
}var canvas = document.getElementById("canvas");
canvas.width = setting.width * setting.pixel;
canvas.height = setting.height * setting.pixel;
var ctx=canvas.getContext("2d");
ctx.fillStyle = setting.color;
ctx.strokeStyle = setting.border;
snake.createFood(0);
loop();
function loop(){
if(!setting.paush){
snake.next();
if(setting.gameOver){
alert("game over");
return;
};
snake.draw();
}
setTimeout( loop,1000/setting.fps );
}
</script></body>
</html>

解决方案 »

  1.   

    我怎么玩不了，方向键和wasd键都不行。
      

  2.   

    不错， 不过玩的过程中好像出BUG了，同时出现了2 个蛇要吃的蛋。。
      

  3.   

    Firefox用户表示，按键无反应。
      

  4.   

    Firefox用户表示，按键无反应。
      

  5.   

    Firefox用户表示，按键无反应。
      

  6.   

    小菜鸟问下，怎么弄啊，我把这个放到.html文件中，但是打开之后什么都没有
      

  7.   

    chrome ,可以
    firefox,也可以，刚测试 的。
      

  8.   

    在fireFox上确实有点小Bug呵，出现两个食物的时候，我吃了一个，当场卡死。
    呵呵，不错的界面，可以把蛇头换个颜色，食物换成绿色
      

  9.   

    你的浏览器不支持canvas,请升级你的浏览器 
    laidezhong(at)gmail.com 无语....
      

  10.   

    我看了，很不错，不过我基于浏览器的兼容做了调整，把canvas的一些东西用能在不支持html5的重写了一下，没有过多考虑性能和效率的问题，仅仅是为了兼容低版本的浏览器，你写的代码，我没动，废话不多说，贴代码了：
    <!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 贪吃蛇</title>
    <style type="text/css">
        html,body{overflow:hidden;}
    </style>
    </head><body>
    <div id="canvas" style="background:#eee;border:1px solid #ccc;position:relative;"></div>
    <br /><span style="color:#ccc;font-family:Arial;font-size:12px;">laidezhong(at)gmail.com</span><script type="text/javascript">var setting = {
        width:50,
        height:25,
        pixel:10,
        fps:3,
        gameOver : false,
        paush : false,
        color : "#ef0f6e",
        border: "#ffffff",
        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]
        }
    };var snake = {
        position : [ [2,0],[1,0],[0,0] ],
        keyCode:39,
        forward:[],
        food:[],
        draw : function(){
            ctx.clearRect(0,0,setting.width*setting.pixel,setting.height*setting.pixel);
            var length = this.position.length;
            for(var k = length - 1;k >= 0;k--){
                this.drawDotted( this.position[k] );
            }
            for(var k=0,kk=this.food.length;k<kk;k++){
                this.drawDotted( this.food[k] );
            }
        },
        next:function(){
            var keyCode = snake.keyCode;
            var forwardList = {
                "37" : [-1,0],
                "38" : [0,-1],
                "39" : [1,0],
                "40" : [0,1]
            };
            if( forwardList[keyCode] && snake.forward[0] != forwardList[keyCode][0] && snake.forward[1] != forwardList[keyCode][1] ) snake.forward = forwardList[keyCode];
            var length = this.position.length;
            var last = [ this.position[length-1][0],this.position[length-1][1] ];
            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];
                }
            };
            this.position[0][0] += this.forward[0];
            this.position[0][1] += this.forward[1];
            for(var k = length - 1;k >= 0;k--){
                if(k){
                    if( this.position[0][0] == this.position[k][0] && this.position[0][1] == this.position[k][1] )setting.gameOver = true;
                    if( this.position[0][0] < 0 || this.position[0][1] < 0 || this.position[0][0] >= setting.width || this.position[0][1] >= setting.height)setting.gameOver = true;
                }
            }
            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( last );
                    this.createFood(k);
                }
            }
            if( setting.level[length]){
                if( setting.level[length][0] )setting.fps+=setting.level[length][0];
                if( setting.level[length][1] ){
                    this.createFood(this.food.length)
                }
                setting.level[length] = false;
            }
        },
        createFood:function(key){
            var r = function(n){
                return parseInt(Math.random()*n) + 1;
            }
            var x = r(setting.width-1);
            var y = r(setting.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];
        },
        drawDotted:function(pos){
            ctx.fillRect( pos[0]*setting.pixel, pos[1]*setting.pixel,setting.pixel,setting.pixel );
            ctx.strokeRect( pos[0]*setting.pixel, pos[1]*setting.pixel,setting.pixel,setting.pixel );
        }
    }document.body.onkeydown = function(e){
        e = e || window.event;
        var keyCode = e.keyCode;
        if(keyCode == 32){
            setting.paush = !setting.paush;
            return;
        };
        snake.keyCode = keyCode;
    }var canvas = document.getElementById("canvas");
    canvas.style.width = setting.width * setting.pixel + 'px';
    canvas.style.height = setting.height * setting.pixel + 'px';
    /**
     * 自定义Context
     */
    var apply = function(dest,src){
    for(var name in src){
    if(!dest[name]){
    dest[name] = src[name];
    }
    }
    };var Context = function(canvas){
    var publicMethods = {
    fillStyle:"#ef0f6e",
    strokeStyle:"#ffffff",
    canvas:canvas,
    clearRect:function(x, y, width, height){
    var it = document.createElement('div');
    it.style.cssText = 'position:absolute;left:' + x + 'px;top:' + y + 'px;width:' + width + 'px;height:' + height + 'px;background-color:' + this.strokeStyle + ';border:1px solid ' + this.strokeStyle + ';';
    this.canvas.appendChild(it);
    },
    fillRect:function(x, y, width, height){
    var it = document.createElement('div');
    it.style.cssText = 'position:absolute;left:' + x + 'px;top:' + y + 'px;width:' + width + 'px;height:' + height + 'px;background-color:' + this.fillStyle + ';border:1px solid ' + this.strokeStyle + ';';
    this.canvas.appendChild(it);
    },
    strokeRect:function(x, y, width, height){

    }
    };

    apply(this,publicMethods);
    };var ctx=new Context(canvas);//canvas.getContext("2d");
    ctx.fillStyle = setting.color;
    ctx.strokeStyle = setting.border;
    snake.createFood(0);
    loop();function loop(){
        if(!setting.paush){
            snake.next();
            if(setting.gameOver){
                alert("game over");
                return;
            };
            snake.draw();
        }

        setTimeout( loop,1000/setting.fps );
    }
    </script></body>
    </html>
      

  11.   

    不错， 不过玩的过程中好像出BUG了
      

  12.   

    html 5,must be IE9.0+ can support this game