js 实现关键词球状旋转效果

效果图

html

<!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>关键字球状效果</title>
<link rel="stylesheet" href="css/style.css" />
<script type="text/javascript" src="js/lrtk.js"></script>
</head>
<body>
    <!-- 代码开始 -->
    <div id="div1">
        <a href="http://www.lanrentuku.com" target="_blank">起名取名</a> <a
            href="http://www.lanrentuku.com" target="_blank">宣传策划</a> <a
            href="http://www.lanrentuku.com" target="_blank">网游试玩</a> <a
            href="http://www.lanrentuku.com" target="_blank">短信表白</a> <a
            href="http://www.lanrentuku.com" target="_blank">卡片设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">网页设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">SEO优化</a> <a
            href="http://www.lanrentuku.com" target="_blank">外语翻译</a> <a
            href="http://www.lanrentuku.com" target="_blank">产品推广</a> <a
            href="http://www.lanrentuku.com" target="_blank">网络营销</a> <a
            href="http://www.lanrentuku.com" target="_blank">动漫设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">招聘求职</a> <a
            href="http://www.lanrentuku.com" target="_blank">家居装修</a> <a
            href="http://www.lanrentuku.com" target="_blank">影视创作</a> <a
            href="http://www.lanrentuku.com" target="_blank">照片美化</a> <a
            href="http://www.lanrentuku.com" target="_blank">产品设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">包装设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">Logo设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">海报设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">程序开发</a> <a
            href="http://www.lanrentuku.com" target="_blank">网店推广</a> <a
            href="http://www.lanrentuku.com" target="_blank">微博营销</a> <a
            href="http://www.lanrentuku.com" target="_blank">网站开发</a> <a
            href="http://www.lanrentuku.com" target="_blank">宣传品设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">配音配词</a> <a
            href="http://www.lanrentuku.com" target="_blank">产品推广</a> <a
            href="http://www.lanrentuku.com" target="_blank">网络营销</a> <a
            href="http://www.lanrentuku.com" target="_blank">动漫设计</a> <a
            href="http://www.lanrentuku.com" target="_blank">招聘求职</a> <a
            href="http://www.lanrentuku.com" target="_blank">家居装修</a> <a
            href="http://www.lanrentuku.com" target="_blank">影视创作</a> <a
            href="http://www.lanrentuku.com" target="_blank">照片美化</a>
    </div>
</body>
</html>

css

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;}

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);
}

来源：懒人图库 原文地址

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原文地址：https://www.cnblogs.com/zhourunbest/p/4793877.html