Android API 实验记录 (三）

渲染JavaScript的浏览器，比以往更快例如firefox，ie不提了，发挥jQuery 创意。此教程将展示如何创建一个滚动的3d标签云.
我们先来看下css
body{
font-family: Arial, "MS Trebuchet", sans-serif;
background-color: #111;
}
#list{
margin:0 auto;
height:600px;
width:600px;
overflow:hidden;
position:relative;
background-color: #000;
}
#list ul,
#list li{
list-style:none;
margin:0;
padding:0;
}
#list a{
position:absolute;
text-decoration: none;
color:#666;
}
#list a:hover{
color:#ccc;
}
html代码:
<div id="list">
<ul>
<li><a href="#">ajax</a></li>
<li><a href="#">css</a></li>
<li><a href="#">design</a></li>
<li><a href="#">firefox</a></li>
<li><a href="#">flash</a></li>
<li><a href="#">html</a></li>
<li><a href="#">Devirtuoso</a></li>
<li><a href="#">jquery</a></li>
<li><a href="#">PHP</a></li>
<li><a href="#">SEO</a></li>
<li><a href="#">usability</a></li>
<li><a href="#">www</a></li>
<li><a href="#">web</a></li>
<li><a href="#">xhtml</a></li>

</ul>
</div>
javascript代码：
$(document).ready(function(){

var element = $('#list a');;
var offset = 0;
var stepping = 0.03;
var list = $('#list');
var $list = $(list)

$list.mousemove(function(e){
var topOfList = $list.eq(0).offset().top
var listHeight = $list.height()
stepping = (e.clientY - topOfList) / listHeight * 0.2 - 0.1;

});

for (var i = element.length - 1; i >= 0; i--)
{
element[i].elemAngle = i * Math.PI * 2 / element.length;
}

setInterval(render, 20);

function render(){
for (var i = element.length - 1; i >= 0; i--){

var angle = element[i].elemAngle + offset;

x = 120 + Math.sin(angle) * 30;
y = 45 + Math.cos(angle) * 40;
size = Math.round(40 - Math.sin(angle) * 40);

var elementCenter = $(element[i]).width() / 2;

var leftValue = (($list.width()/2) * x / 100 - elementCenter) + "px"

$(element[i]).css("fontSize", size + "pt");
$(element[i]).css("opacity",size/100);
$(element[i]).css("zIndex" ,size);
$(element[i]).css("left" ,leftValue);
$(element[i]).css("top", y + "%");
}

offset += stepping;
}

});
注意还要加上jq库
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" type="text/javascript"></script>