https://www.whjhq.gov.cn/_res/js/tagscloud.js

1var radius = 65;
2var d = 200;
3var dtr = Math.PI / 180;
4var mcList = [];
5var lasta = 1;
6var lastb = 1;
7var distr = true;
8var tspeed = 11;
9var size = 200;
10var mouseX = 0;
11var mouseY = 10;
12var howElliptical = 1;
13var aA = null;
14var oDiv = null;
15window.onload=function ()
16{
17	var i=0;
18	var oTag=null;
19	oDiv=document.getElementById('tagscloud');
20	aA=oDiv.getElementsByTagName('a');
21	for(i=0;i<aA.length;i++)
22	{
23		oTag={};		
24		aA[i].onmouseover = (function (obj) {
25			return function () {
26				obj.on = true;
27				this.style.zIndex = 9999;
28				this.style.color = '#fff';
29				this.style.padding = '0px 10px';
30				this.style.filter = "alpha(opacity=100)";
31				this.style.opacity = 1;
32			}
33		})(oTag)
34		aA[i].onmouseout = (function (obj) {
35			return function () {
36				obj.on = false;
37				this.style.zIndex = obj.zIndex;
38				this.style.color = '#fff';
39				this.style.padding = '0px 10px';
40				this.style.filter = "alpha(opacity=" + 100 * obj.alpha + ")";
41				this.style.opacity = obj.alpha;
42				this.style.zIndex = obj.zIndex;
43			}
44		})(oTag)
45		oTag.offsetWidth = aA[i].offsetWidth;
46		oTag.offsetHeight = aA[i].offsetHeight;
47		mcList.push(oTag);
48	}
49	sineCosine( 0,0,0 );
50	positionAll();
51	(function () {
52            update();
53            setTimeout(arguments.callee, 40);
54        })();
55};
56function update()
57{
58	var a, b, c = 0;
59        a = (Math.min(Math.max(-mouseY, -size), size) / radius) * tspeed;
60        b = (-Math.min(Math.max(-mouseX, -size), size) / radius) * tspeed;
61        lasta = a;
62        lastb = b;
63        if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) {
64            return;
65        }
66        sineCosine(a, b, c);
67        for (var i = 0; i < mcList.length; i++) {
68            if (mcList[i].on) {
69                continue;
70            }
71            var rx1 = mcList[i].cx;
72            var ry1 = mcList[i].cy * ca + mcList[i].cz * (-sa);
73            var rz1 = mcList[i].cy * sa + mcList[i].cz * ca;
74
75            var rx2 = rx1 * cb + rz1 * sb;
76            var ry2 = ry1;
77            var rz2 = rx1 * (-sb) + rz1 * cb;
78
79            var rx3 = rx2 * cc + ry2 * (-sc);
80            var ry3 = rx2 * sc + ry2 * cc;
81            var rz3 = rz2;
82
83            mcList[i].cx = rx3;
84            mcList[i].cy = ry3;
85            mcList[i].cz = rz3;
86
87            per = d / (d + rz3);
88
89            mcList[i].x = (howElliptical * rx3 * per) - (howElliptical * 2);
90            mcList[i].y = ry3 * per;
91            mcList[i].scale = per;
92            var alpha = per;
93            alpha = (alpha - 0.6) * (10 / 6);
94            mcList[i].alpha = alpha * alpha * alpha - 0.2;
95            mcList[i].zIndex = Math.ceil(100 - Math.floor(mcList[i].cz));
96        }
97        doPosition();
98}
99function positionAll()
100{
101	var phi = 0;
102    var theta = 0;
103    var max = mcList.length;
104    for (var i = 0; i < max; i++) {
105        if (distr) {
106            phi = Math.acos(-1 + (2 * (i + 1) - 1) / max);
107            theta = Math.sqrt(max * Math.PI) * phi;
108        } else {
109            phi = Math.random() * (Math.PI);
110            theta = Math.random() * (2 * Math.PI);
111        }
112        //坐标变换
113        mcList[i].cx = radius * Math.cos(theta) * Math.sin(phi);
114        mcList[i].cy = radius * Math.sin(theta) * Math.sin(phi);
115        mcList[i].cz = radius * Math.cos(phi);
116
117        aA[i].style.left = mcList[i].cx + oDiv.offsetWidth / 2 - mcList[i].offsetWidth / 2 + 'px';
118        aA[i].style.top = mcList[i].cy + oDiv.offsetHeight / 2 - mcList[i].offsetHeight / 2 + 'px';
119    }
120}
121function doPosition()
122{
123	var l = oDiv.offsetWidth / 2;
124        var t = oDiv.offsetHeight / 2;
125        for (var i = 0; i < mcList.length; i++) {
126            if (mcList[i].on) {
127                continue;
128            }
129            var aAs = aA[i].style;
130            if (mcList[i].alpha > 0.1) {
131                if (aAs.display != '')
132                    aAs.display = '';
133            } else {
134                if (aAs.display != 'none')
135                    aAs.display = 'none';
136                continue;
137            }
138            aAs.left = mcList[i].cx + l - mcList[i].offsetWidth / 2 + 'px';
139            aAs.top = mcList[i].cy + t - mcList[i].offsetHeight / 2 + 'px';
140            //aAs.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';
141            //aAs.filter="progid:DXImageTransform.Microsoft.Alpha(opacity="+100*mcList[i].alpha+")";
142            aAs.filter = "alpha(opacity=" + 100 * mcList[i].alpha + ")";
143            aAs.zIndex = mcList[i].zIndex;
144            aAs.opacity = mcList[i].alpha;
145        }
146}
147function sineCosine( a, b, c)
148{
149	sa = Math.sin(a * dtr);
150    ca = Math.cos(a * dtr);
151    sb = Math.sin(b * dtr);

152    cb = Math.cos(b * dtr);
153	sc = Math.sin(c * dtr);
154	cc = Math.cos(c * dtr);
155}