烟花代码
来源:互联网 发布:js array each 编辑:程序博客网 时间:2024/04/28 14:20
<!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>【编程游戏】贺岁放礼花 -- freewind</title>
<style type="text/css">
html,body{background:#000; height:100%; margin:0px; padding:0px;color:#FFF;}
.ball{color:#FF0000; position:absolute; font-size:16px;}
.star{color:#FF0000; position:absolute; font-size:4px;}
</style>
<script type="text/javascript">
function Firework(sky, loop){
this.sky = sky;
this.skyWidth = document.body.clientWidth || document.documentElement.clientWidth;
this.skyHeight= document.body.clientHeight || document.documentElement.clientHeight;
this.x = this.y = 0;
this.step = 20;
this.delay = 30;
this.stars = [];
this.r = 10;
this.step2 = 7;
this.radius = 90;
this.angle = 45;
this.num = 16;
this.loop = loop;
}
Firework.prototype = {
init : function(){
this.x = parseInt(this.skyWidth/2 * Math.random()) + this.skyWidth / 4;
this.y = this.skyHeight;
this._y = parseInt((this.skyHeight / 4) * Math.random()) + this.skyHeight / 5;
},
showBall : function(){
this.ball = document.createElement("div");
this.ball.innerHTML = "●";
this.ball.className = "ball";
this.ball.style.left = this.x + "px";
this.ball.style.top = this.y + "px";
this.sky.appendChild(this.ball);
},
moveBall : function(){
var self = this;
if(this.y > this._y){
var p = parseInt((this.skyHeight - this.y) / (this.skyHeight - this._y)*10);
this.y -= (this.step - p * 1.6);
this.ball.style.fontSize = 16 - p + "px";
this.ball.style.top = this.y + "px";
setTimeout(function(){self.moveBall();}, this.delay);
}else{
this.fire();
}
},
hideBall : function(){
this.sky.removeChild(this.ball);
this.ball = null;
},
showStars : function(){
var colors = ['#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00','#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00'];
var n = cs = parseInt(Math.random() * colors.length / 2);
var cc = parseInt(Math.random() * colors.length / 2);
var colorMode = parseInt(Math.random() * 2);
this.r = 10;
this.radius = Math.round(Math.random() * 30) + 60;
this.num = Math.round(Math.random() * 6 + 4) * 2;
this.angle = 180 / this.num * 2;
for(var i=1; i<=this.num; i++){
this.stars[i] = document.createElement("div");
this.stars[i].innerHTML = "★";
this.stars[i].className = "star";
if(colorMode == 1){
this.stars[i].style.color = colors[n];
if(++n > cs + cc)
n = cs;
}else{
this.stars[i].style.color = colors[parseInt(Math.random() * colors.length)];
}
this.sky.appendChild(this.stars[i]);
}
},
moveStars : function(){
var self = this;
if(this.r < this.radius){
var p = this.step2 - parseInt(this.r / this.radius * 5);
p = p < 1 ? 1 : p;
this.r += p;
p = parseInt(this.r / this.radius * 100);
for(var i=1; i<=this.num; i++){
this.stars[i].style.left = this.x - Math.round(this.r * Math.sin(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
this.stars[i].style.top = this.y - Math.round(this.r * Math.cos(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
this.stars[i].style.fontSize = 4 + p/10 + "px";
if(p > 85){
var opacity = 100 - (p - 85) * 4;
if(document.all){
this.stars[i].style.filter = "alpha(opacity=" + opacity + ")";
}else{
this.stars[i].style.MozOpacity = opacity / 100;
}
}
}
setTimeout(function(){self.moveStars();}, this.delay);
}else{
setTimeout(function(){self.hideStars();}, 300 * Math.random());
}
},
hideStars : function(){
for(var i=1; i<=this.num; i++){
this.sky.removeChild(this.stars[i]);
this.stars[i] = null;
}
if(this.loop){
this.play();
}
},
fire : function(){
this.hideBall();
this.showStars();
this.moveStars();
},
play : function(){
this.init();
this.showBall();
this.moveBall();
}
};
window.onload = function(){
for(var i=0; i<5; i++)
new Firework(document.body, true).play();
};
</script>
</head>
<body>
</body>
</html>
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