javascript实现动态标签云

1
2
3
4
5
6
#div1 {position:relative; width:350px; height:350px; border:1px solid #000; margin: 20px auto 0; }
#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#000; font-weight:bold; text-decoration:none; padding: 3px 6px; }
#div1 a:hover {border: 1px solid #eee; background: #FFF; }
#div1 .blue {color:blue;}
#div1 .red {color:red;}
#div1 .green {color:green;}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
<div id="div1">
  <a href="#">标签云</a>
  <a href="#" class="red">PHP</a>
  <a href="#">瀑布流</a>
  <a href="#">Tab</a>
  <a href="#" class="blue">流体布局</a>
  <a href="#">SEO</a>
  <a href="#" class="red">彩蛋</a>
  <a href="#" class="green">JavaScript</a>
  <a href="#">miaov</a>
  <a href="#" class="red">CSS</a>
  <a href="#">asp.net</a>
  <a href="#" class="blue">蓝色经典</a>
  <a href="#">OOP</a>
  <a href="#" class="red">Android</a>
  <a href="#" class="blue">妙味茶馆</a>
  <a href="#">dialog</a>
  <a href="#" class="blue">淘客</a>
  <a href="#">Pin</a>
  <a href="#">微博</a>
  <a href="#" class="green">IPhone</a>
</div>

1
2
3
4
5
6
$(document).ready(function() {
  $("#div1").windstagball({
      radius:120,
      speed:10
    });
  });

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
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);
}