分享一个3D球面标签云

2021-11-17 09:35:25

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body {background: #000 url(index.png) no-repeat center 230px;}

#div1 {position:relative; width:450px; height:450px; margin: 20px auto 0; }

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

#div1 a:hover {border: 1px solid #eee; background: #000; }

#div1 .blue {color:blue;}

#div1 .red {color:red;}

#div1 .yellow {color:yellow;}

p { font: 16px Microsoft YaHei; text-align: center; color: #ba0c0c; }

p a { font-size: 14px; color: #ba0c0c; }

p a:hover { color: red; }

var radius = 120;

var dtr = Math.PI/180;

var d=300;

var mcList = [];

var active = false;

var lasta = 1;

var lastb = 1;

var distr = true;

var tspeed=10;

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++)

	{

		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, 30);

};

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);

}

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