Using JS to implement 3D spherical tag cloud sample code

Author：Eve Cole Update Time：2025-02-28 06:48:01

Matter:

1. It was found that there were insufficient instances and could not be hovered (to be resolved)

2. The system cannot randomly and automatically color (to be resolved)

First, a high-profile website using tag cloud - the photo sharing website Flickr. The designer of the tag cloud is interaction designer Stewart Butterfield. Later, tag cloud was adopted by websites such as del and Technorati.

The first published appearance of a tag cloud (or at least a weighted list), which boiled down to mostly "subliminal files", was in Douglas Coupland's Microserfs (1995). In Lester Leaps Out, Welsh poet Landau, uses the same logic to weight text to create a graphic text map to describe jazz music. The poem appears in his book Magic Fire Chevrolet (1980).

html code snippet

Copy the code code as follows:

<!DOCTYPE html>

<html>

<title>3D spherical label</title>

</headers>

<body>

<a href="#">Fruit categories</a>

<a href="#">Apple</a>

<a href="#">Banana</a>

<a href="#">Watermelon</a>

<a href="#">Dragon fruit</a>

<a href="#">Spherical</a>

<a href="#">Inherit</a>

<a href="#">Language categories</a>

<a href="#">Tomatoes</a>

<a href="#">Tomato</a>

</div>

<p>3D spherical tag</p>

</body></html>

Javascript snippet

Copy the code code as follows:

var radius = 120; //Rotation radius;

var dtr = Math.PI/180;

vard=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()

{

varphi=0;

var theta=0;

var max=mcList.length;

var i=0;

var aTmp=[];

var oFragment=document.createDocumentFragment();

//Random sorting

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);

}

//Coordinate transformation

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);

}

CSS snippet

Copy the code code as follows:

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; }

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

pa:hover { color: red; }