非常漂亮js动态球型云标签特效代码

时间：2022-06-25 20:30:27 编辑：袖梨来源：一聚教程网

提示：您可以先修改部分代码再运行

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('tagsList');

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);
}

})();
</script>

提示：您可以先修改部分代码再运行

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