JS关键字球状旋转效果的实例代码

作者：Eve Cole 更新时间：2025-01-28 15:24:01

有时上网查资料，看到别人的博客上有关键字旋转的效果，觉得蛮不错的。于是网上搜索了一下它的实现，好吧，自己动手写写。

HTML:

复制代码代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

<a >Asp.net webform</a>

<a >Castle</a>

<a >Spring.net</a>

<a >NHibernate</a>

<a >Javascript</a>

<a >Jquery</a>

<a >KendoUI</a>

</div>

</body>

</html>

CSS:

复制代码代码如下:

#div1{height:400px;width:450px; position:relative; margin:10px auto;}

#div1 a{position:absolute;top:0px;left:0px;font-weight:bold;padding:3px 6px; color:black; text-decoration: none;}

#div1 a:hover{border:1px solid #eee;background:#ccc;border-radius:5px;}

既然是关键字，我觉得给他们加上不同的颜色才够酷。初始化一个数组存放颜色值，然后再随机分配给各个标签。

复制代码代码如下:

var colors = ["#FF60AF","#9F35FF","#FF2D2D","#6C6C6C","#003D79","#00AEAE","#019858"];

var rand = Math.ceil(Math.random()*6);

aA[i].style.color=colors[rand];

JS：

复制代码代码如下:

var radius = 100;

var dtr = Math.PI/180;

var d=300;

var mcList = [];

var active = false;

var lasta = 1;

var lastb = 1;

var distr = true;

var tspeed=2;

var size=250;

var mouseX=0;

var mouseY=0;

var howElliptical=1;

var aA=null;

var oDiv=null;

window.onload=function ()

{

var i=0;

var oTag=null;

oDiv=document.getElementById('div1');

aA=oDiv.getElementsByTagName('a');

for(i=0;i<aA.length;i++)

{

var colors = ["#FF60AF","#9F35FF","#FF2D2D","#6C6C6C","#003D79","#00AEAE","#019858"];

var rand = Math.ceil(Math.random()*6);

aA[i].style.color=colors[rand];

oTag={};

oTag.offsetWidth=aA[i].offsetWidth;

oTag.offsetHeight=aA[i].offsetHeight;

mcList.push(oTag);

}

sineCosine( 0,0,0 );

positionAll();

oDiv.onmouseover=function ()

{

active=true;

};

oDiv.onmouseout=function ()

{

active=false;

};

oDiv.onmousemove=function (ev)

{

var oEvent=window.event || ev;

mouseX=oEvent.clientX-(oDiv.offsetLeft+oDiv.offsetWidth/2);

mouseY=oEvent.clientY-(oDiv.offsetTop+oDiv.offsetHeight/2);

mouseX/=5;

mouseY/=5;

};

setInterval(update, 10);

};

function update()

{

var a;

var b;

if(active)

{

a = (-Math.min( Math.max( -mouseY, -size ), size ) / radius ) * tspeed;

b = (Math.min( Math.max( -mouseX, -size ), size ) / radius ) * tspeed;

}

else

{

a = lasta * 0.98;

b = lastb * 0.98;

}

lasta=a;

lastb=b;

if(Math.abs(a)<=0.01 && Math.abs(b)<=0.01)

{

return;

}

var c=0;

sineCosine(a,b,c);

for(var j=0;j<mcList.length;j++)

{

var rx1=mcList[j].cx;

var ry1=mcList[j].cy*ca+mcList[j].cz*(-sa);

var rz1=mcList[j].cy*sa+mcList[j].cz*ca;

var rx2=rx1*cb+rz1*sb;

var ry2=ry1;

var rz2=rx1*(-sb)+rz1*cb;

var rx3=rx2*cc+ry2*(-sc);

var ry3=rx2*sc+ry2*cc;

var rz3=rz2;

mcList[j].cx=rx3;

mcList[j].cy=ry3;

mcList[j].cz=rz3;

per=d/(d+rz3);

mcList[j].x=(howElliptical*rx3*per)-(howElliptical*2);

mcList[j].y=ry3*per;

mcList[j].scale=per;

mcList[j].alpha=per;

mcList[j].alpha=(mcList[j].alpha-0.6)*(10/6);

}

doPosition();

depthSort();

}

function depthSort()

{

var i=0;

var aTmp=[];

for(i=0;i<aA.length;i++)

{

aTmp.push(aA[i]);

}

aTmp.sort

(

function (vItem1, vItem2)

{

if(vItem1.cz>vItem2.cz)

{

return -1;

}

else if(vItem1.cz<vItem2.cz)

{

return 1;

}

else

{

return 0;

}

);

for(i=0;i<aTmp.length;i++)

{

aTmp[i].style.zIndex=i;

}

function positionAll()

{

var phi=0;

var theta=0;

var max=mcList.length;

var i=0;

var aTmp=[];

var oFragment=document.createDocumentFragment();

//随机排序

for(i=0;i<aA.length;i++)

{

aTmp.push(aA[i]);

}

aTmp.sort

(

function ()

{

return Math.random()<0.5?1:-1;

}

);

for(i=0;i<aTmp.length;i++)

{

oFragment.appendChild(aTmp[i]);

}

oDiv.appendChild(oFragment);

for( var i=1; i<max+1; i++){

if( distr )

{

phi = Math.acos(-1+(2*i-1)/max);

theta = Math.sqrt(max*Math.PI)*phi;

}

else

{

phi = Math.random()*(Math.PI);

theta = Math.random()*(2*Math.PI);

}

//坐标变换

mcList[i-1].cx = radius * Math.cos(theta)*Math.sin(phi);

mcList[i-1].cy = radius * Math.sin(theta)*Math.sin(phi);

mcList[i-1].cz = radius * Math.cos(phi);

aA[i-1].style.left=mcList[i-1].cx+oDiv.offsetWidth/2-mcList[i-1].offsetWidth/2+'px';

aA[i-1].style.top=mcList[i-1].cy+oDiv.offsetHeight/2-mcList[i-1].offsetHeight/2+'px';

}

function doPosition()

{

var l=oDiv.offsetWidth/2;

var t=oDiv.offsetHeight/2;

for(var i=0;i<mcList.length;i++)

{

aA[i].style.left=mcList[i].cx+l-mcList[i].offsetWidth/2+'px';

aA[i].style.top=mcList[i].cy+t-mcList[i].offsetHeight/2+'px';

aA[i].style.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';

aA[i].style.filter="alpha(opacity="+100*mcList[i].alpha+")";

aA[i].style.opacity=mcList[i].alpha;

}

function sineCosine( a, b, c)

{

sa = Math.sin(a * dtr);

ca = Math.cos(a * dtr);

sb = Math.sin(b * dtr);

cb = Math.cos(b * dtr);

sc = Math.sin(c * dtr);

cc = Math.cos(c * dtr);

}

最后看下效果：