JavaScript实现圆形浮动标签云演示代码,JS标签云效果源码,在鼠标的作用下会自动转动,整体上围绕成一个圆形,各个标签之间无需Div代码,直接文字+链接的形式,有多少就显示多少,JavaScript会自动调整显示数量,让视觉效果最佳。
运行效果如下图所示:
具体代码如下:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > <html xmlns= "http://www.w3.org/1999/xhtml" > <head> <meta http-equiv= "Content-Type"
content= "text/html; charset=gb2312"
/> <title>js关键字球状旋转效果</title> <style> body{background: #09c;} #div1{height:400px;width:450px; position:relative; margin:10px auto;} #div1 a{position:absolute;top:0px;left:0px;color:#fff;font-weight:bold;padding:3px 6px;} #div1 a:hover{border:1px solid #eee;background:#000;border-radius:5px;} </style> <script type= "text/javascript" > var
radius = 150; var
dtr = Math.PI/180; var
d=300; var
mcList = []; var
active = false ; var
lasta = 1; var
lastb = 1; var
distr = true ; var
tspeed=2; 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); } </script> </head> <body> <!-- 代码开始 --> <div id= "div1" > <a href= "#"
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