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【编程游戏】贺岁放礼花。（点燃17楼dh20156的焰火）

2008-12-25 15:05 155 查看

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【编程游戏】贺岁放礼花。（第一名奖励10000可用分）
作者：

点燃 [Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

<!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" xml:lang="zh-CN" lang="zh-CN">
<head>
<meta http-equiv="Content-Language" content="zh-CN" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>【编程游戏】贺岁放礼花。</title>
</head>
<body>
<script type="text/javascript">
var powder = function(sky,spattern,scolor,astart,aend){
this.sky = sky;
this.size = 50;
this.color = scolor;
this.start = astart;
this.end = aend;
this.times = 20;
this.steps = 100;
this.innerHTML = spattern||'●';
this.style.cssText = 'position:absolute;font-weight:bold;font-family:arial;color:'+scolor+';left:'+this.start[0]+'px;top:'+this.start[1]+';font-size:'+this.size+'px;';
this.go = function(){
var op = this,sky = this.sky;color = this.color,size = this.size,startX = this.start[0],startY = this.start[1],endX = this.end[0],endY = this.end[1],steps = this.steps;
var dx = endX - startX;
var dy = endY - startY;
var curStep = 0;
var flash = function(){
if(!sky){return;}
var sbg = sky.style.background = color;
window.setTimeout(function(){sky.style.background = 'black';sky.removeChild(op);});
};
var move = function(){
curStep++;
if(curStep>steps){
window.clearInterval(timer);
flash();
return;
}
var sx = dx*curStep/steps,sy = dy*curStep/steps,ss = size*curStep/steps;
op.style.left = (startX + sx) + "px";
op.style.top = (startY + sy) + "px";
op.style.fontSize = (size - ss) + "px";
}
var timer = window.setInterval(move,this.times);
};
};

var flash = function(sky){
this.sky = sky;
};
flash.prototype = {
fire:function(){
var sky = this.sky;
var pf = function(){
var rsx = parseInt(Math.random()*1000),rey = parseInt(Math.random()*10);
var astart = [rsx,800],aend = [rsx,rey];
var x = document.createElement("div");
sky.appendChild(x);
powder.call(x,sky,'●','red',astart,aend);
x.go();
};
window.setInterval(pf,1000);
},
init:function(){
if(!this.sky){return;}
this.sky.style.cssText = 'background:black;padding:0;border:0;width:100%;height:100%;overflow:hidden;';
}
};
var xmas_flash = new flash(document.body);
xmas_flash.init();
xmas_flash.fire();
</script>
</body>
</html>

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