Canvas 3D球形文字云动画特效

效果图：

代码如下，复制即可使用：

（适用浏览器：360、FireFox、Chrome、Opera、傲游、搜狗、世界之窗. 不支持Safari、IE8及以下浏览器。）

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>Canvas 3D球形文字云动画特效</title>

<style>

body {

    background-color:#000000;

    color:#555555;

}

h4 {

    font-family:sans-serif;

    color:#555555;

    font-size:16px;

}

h3 {

    font-family:sans-serif;

    color:#555555;

}

p {

    font-family:sans-serif;

    color:#888888;

    font-size:14px;

}

a {

    font-family:sans-serif;

    color:#d15423;

    text-decoration:none;

}

</style>

</head>

<body>

<!-- 此处需要自己修改路径 -->

<script src="js/canvas.min.js"></script>

<div style="text-align:center">

    <canvas id="canvasOne" width="900" height="520" ></canvas>

</div>

<script type="text/javascript">

window.addEventListener("load", windowLoadHandler, false);

var sphereRad = 280;

var radius_sp=1;

var opt_display_dots = false;

var unicodeFlakes = ['?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '我', '蒌', '火', '的', '山', '首', '页', '嫖', '是', '肺', '化', '?', '化', '?', '符', '?', '是', '原', '子', '序', '?', '是', '它', '是', '肺', '灰', '白', '色', '?', '金', '?', '有', '光', '?', '冱', '硬', '?', '於', '碳', '族', '化', '?', '性', '冱', '陪', '同', '族', '的', '遽', '陪', '矽', '相', '共', '有', '五', '肺', '同', '位', '素', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '才', '菜', '参', '餐', '层', '茶', '差', '长', '常', '场', '唱', '超', '车', '成', '城', '程', '吃', '店', '定', '订', '丢', '东', '冬', '懂', '动', '都', '读', '独', '度', '短', '对', '多', '饿', '儿', '而', '发', '法', '反', '饭', '方', '房', '放', '飞', '非', '费', '分', '份', '风', '封', '夫', '服', '附', '父', '复', '该', '改', '干', '感', '刚', '高', '告', '哥', '歌', '格', '个', '给', '号', '喝', '和', '河', '贺', '黑', '很', '红', '后', '候', '湖', '护', '花', '化', '画', '话', '坏', '欢', '还', '换', '黄', '回', '会', '婚', '活', '火', '或', '机', '鸡', '级', '极', '急', '际', '济', '继', '寄', '加', '家', '假', '价', '力', '历', '丽', '联', '凉', '两', '亮', '谅', '辆', '了', '林', '零', '六', '楼', '路', '录', '旅', '妈', '马', '码', '吗', '买', '卖', '满', '慢', '忙', '猫', '毛', '贸', '么', '没', '每', '美', '妹', '米', '面', '民', '明', '末', '母', '目', '拿', '哪', '那', '奶', '男', '南', '难', '脑', '呢', '能', '你', '年', '念', '鸟', '您', '牛', '农', '努', '女', '暖', '欧', '怕', '乓', '旁', '胖', '跑', '朋', '片', '漂', '票', '乒', '平', '期', '其', '奇', '骑', '起', '气', '汽', '千', '前', '签', '轻', '清', '情', '请', '秋', '球', '区', '取', '去', '趣', '全', '然', '让', '首', '售', '书', '术', '树', '双', '谁', '水', '睡', '说', '司', '思', '死', '四', '送', '诉', '算', '虽', '岁', '孙', '所', '他', '她', '它', '台', '太', '谈', '汤', '堂', '套', '特', '踢', '提', '题', '体', '天', '填', '条', '铁', '听', '厅', '庭', '通', '同', '头', '图', '外', '玩', '完', '晚', '万', '王', '网', '往', '忘', '望', '卫', '为', '位', '文', '我', '卧', '五', '午', '务', '物', '西', '吸', '希', '息', '习', '牙', '亚', '烟', '言', '羊', '阳', '样', '药', '要', '也', '业', '夜', '一', '衣', '医', '已', '以', '易', '意', '因', '音', '印', '银', '应', '英', '影', '硬', '用', '邮', '油', '游', '友', '有', '又', '右', '鱼', '愉', '雨', '语', '元', '员', '园', '原', '远', '院', '愿', '月', '在', '早', '怎', '张', '找', '照', '者', '这', '真', '正', '证', '知', '只', '之', '直', '止', '纸', '至', '治', '中', '钟', '种', '重', '周', '洲', '主', '住', '助', '祝', '注', '专', '准' ];

//for debug messages

var Debugger = function() { };

Debugger.log = function(message) {

    try {

        console.log(message);

    }

    catch (exception) {

        return;

    }

}

function windowLoadHandler() {

    canvasApp();

}

function canvasSupport() {

    return Modernizr.canvas;

}

function canvasApp() {

    if (!canvasSupport()) {

        return;

    }

    var theCanvas = document.getElementById("canvasOne");

    var context = theCanvas.getContext("2d");

    var displayWidth;

    var displayHeight;

    var timer;

    var wait;

    var count;

    var numToAddEachFrame;

    var particleList;

    var recycleBin;

    var particleAlpha;

    var r,g,b;

    var fLen;

    var m;

    var projCenterX;

    var projCenterY;

    var zMax;

    var turnAngle;

    var turnSpeed;

    var sphereCenterX, sphereCenterY, sphereCenterZ;

    var particleRad;

    var zeroAlphaDepth;

    var randAccelX, randAccelY, randAccelZ;

    var gravity;

    var rgbString;

    //we are defining a lot of variables used in the screen update functions globally so that they don't have to be redefined every frame.

    var p;

    var outsideTest;

    var nextParticle;

    var sinAngle;

    var cosAngle;

    var rotX, rotZ;

    var depthAlphaFactor;

    var i;

    var theta, phi;

    var x0, y0, z0;

    init();

  // INITIALLI

    function init() {

        wait = 1;

        count = wait - 1;

        numToAddEachFrame = 4;

        //particle color

        r = 70;

        g = 255;

        b = 140;

        rgbString = "rgba("+r+","+g+","+b+","; //partial string for color which will be completed by appending alpha value.

        particleAlpha = 1; //maximum alpha

        displayWidth = theCanvas.width;

        displayHeight = theCanvas.height;

        fLen = 320; //represents the distance from the viewer to z=0 depth.

        //projection center coordinates sets location of origin

        projCenterX = displayWidth/2;

        projCenterY = displayHeight/2;

        //we will not draw coordinates if they have too large of a z-coordinate (which means they are very close to the observer).

        zMax = fLen-2;

        particleList = {};

        recycleBin = {};

        //random acceleration factors - causes some random motion

        randAccelX = 0.1;

        randAccelY = 0.1;

        randAccelZ = 0.1;

        gravity = -0; //try changing to a positive number (not too large, for example 0.3), or negative for floating upwards.

        particleRad = 2.5;

        sphereCenterX = 0;

        sphereCenterY = 0;

        sphereCenterZ = -3 - sphereRad;

        //alpha values will lessen as particles move further back, causing depth-based darkening:

        zeroAlphaDepth = -750; 

        turnSpeed = 2*Math.PI/1200; //the sphere will rotate at this speed (one complete rotation every 1600 frames).

        turnAngle = 0; //initial angle

        timer = setInterval(onTimer, 10/24);

    }

    function onTimer() {

        //if enough time has elapsed, we will add new particles.

        count++;

            if (count >= wait) {

            count = 0;

            for (i = 0; i < numToAddEachFrame; i++) {

                theta = Math.random()*2*Math.PI;

                phi = Math.acos(Math.random()*2-1);

                x0 = sphereRad*Math.sin(phi)*Math.cos(theta);

                y0 = sphereRad*Math.sin(phi)*Math.sin(theta);

                z0 = sphereRad*Math.cos(phi);

                //We use the addParticle function to add a new particle. The parameters set the position and velocity components.

                //Note that the velocity parameters will cause the particle to initially fly outwards away from the sphere center (after

                //it becomes unstuck).

                var p = addParticle(x0, sphereCenterY + y0, sphereCenterZ + z0, 0.002*x0, 0.002*y0, 0.002*z0);

                //we set some "envelope" parameters which will control the evolving alpha of the particles.

                p.attack = 50;

                p.hold = 50;

                p.decay = 100;

                p.initValue = 0;

                p.holdValue = particleAlpha;

                p.lastValue = 0;

                //the particle will be stuck in one place until this time has elapsed:

                p.stuckTime = 90 + Math.random()*20;

                p.accelX = 0;

                p.accelY = gravity;

                p.accelZ = 0;

            }

        }

        //update viewing angle

        turnAngle = (turnAngle + turnSpeed) % (2*Math.PI);

        sinAngle = Math.sin(turnAngle);

        cosAngle = Math.cos(turnAngle);

        //background fill

        context.fillStyle = "#000000";

        context.fillRect(0,0,displayWidth,displayHeight);

        //update and draw particles

        p = particleList.first;

        while (p != null) {

            //before list is altered record next particle

            nextParticle = p.next;

            //update age

            p.age++;

            //if the particle is past its "stuck" time, it will begin to move.

            if (p.age > p.stuckTime) {

                p.velX += p.accelX + randAccelX*(Math.random()*2 - 1);

                p.velY += p.accelY + randAccelY*(Math.random()*2 - 1);

                p.velZ += p.accelZ + randAccelZ*(Math.random()*2 - 1);

                p.x += p.velX;

                p.y += p.velY;

                p.z += p.velZ;

            }

            /*

            We are doing two things here to calculate display coordinates.

            The whole display is being rotated around a vertical axis, so we first calculate rotated coordinates for

            x and z (but the y coordinate will not change).

            Then, we take the new coordinates (rotX, y, rotZ), and project these onto the 2D view plane.

            */

            rotX =  cosAngle*p.x + sinAngle*(p.z - sphereCenterZ);

            rotZ =  -sinAngle*p.x + cosAngle*(p.z - sphereCenterZ) + sphereCenterZ;

            m =radius_sp* fLen/(fLen - rotZ);

            p.projX = rotX*m + projCenterX;

            p.projY = p.y*m + projCenterY;

            //update alpha according to envelope parameters.

            if (p.age < p.attack+p.hold+p.decay) {

                if (p.age < p.attack) {

                    p.alpha = (p.holdValue - p.initValue)/p.attack*p.age + p.initValue;

                }

                else if (p.age < p.attack+p.hold) {

                    p.alpha = p.holdValue;

                }

                else if (p.age < p.attack+p.hold+p.decay) {

                    p.alpha = (p.lastValue - p.holdValue)/p.decay*(p.age-p.attack-p.hold) + p.holdValue;

                }

            }

            else {

                p.dead = true;

            }

            //see if the particle is still within the viewable range.

            if ((p.projX > displayWidth)||(p.projX<0)||(p.projY<0)||(p.projY>displayHeight)||(rotZ>zMax)) {

                outsideTest = true;

            }

            else {

                outsideTest = false;

            }

            if (outsideTest||p.dead) {

                recycle(p);

            }

            else {

                //depth-dependent darkening

                depthAlphaFactor = (1-rotZ/zeroAlphaDepth);

                depthAlphaFactor = (depthAlphaFactor > 1) ? 1 : ((depthAlphaFactor<0) ? 0 : depthAlphaFactor);

                context.fillStyle = rgbString + depthAlphaFactor*p.alpha + ")";

        　　　　/*ADD TEXT function!*/

       　　　　

                context.fillText(p.flake,p.projX, p.projY);

        　　　　/*ADD TEXT function!*/

                //draw

                context.beginPath();

        if(opt_display_dots)

          {context.arc(p.projX, p.projY, m*particleRad, 0, 2*Math.PI, false);}

                context.closePath();

                context.fill();

            }

            p = nextParticle;

        }

    }

    function addParticle(x0,y0,z0,vx0,vy0,vz0) {

        var newParticle;

        var color;

        //check recycle bin for available drop:

        if (recycleBin.first != null) {

            newParticle = recycleBin.first;

            //remove from bin

            if (newParticle.next != null) {

                recycleBin.first = newParticle.next;

                newParticle.next.prev = null;

            }

            else {

                recycleBin.first = null;

            }

        }

        //if the recycle bin is empty, create a new particle (a new ampty object):

        else {

            newParticle = {};

        }

        //add to beginning of particle list

        if (particleList.first == null) {

            particleList.first = newParticle;

            newParticle.prev = null;

            newParticle.next = null;

        }

        else {

            newParticle.next = particleList.first;

            particleList.first.prev = newParticle;

            particleList.first = newParticle;

            newParticle.prev = null;

        }

        //initialize

        newParticle.x = x0;

        newParticle.y = y0;

        newParticle.z = z0;

        newParticle.velX = vx0;

        newParticle.velY = vy0;

        newParticle.velZ = vz0;

        newParticle.age = 0;

        newParticle.dead = false;

    newParticle.flake = unicodeFlakes[Math.floor(Math.random() * unicodeFlakes.length)];

        if (Math.random() < 0.5) {

            newParticle.right = true;

        }

        else {

            newParticle.right = false;

        }

        return newParticle;

    }

    function recycle(p) {

        //remove from particleList

        if (particleList.first == p) {

            if (p.next != null) {

                p.next.prev = null;

                particleList.first = p.next;

            }

            else {

                particleList.first = null;

            }

        }

        else {

            if (p.next == null) {

                p.prev.next = null;

            }

            else {

                p.prev.next = p.next;

                p.next.prev = p.prev;

            }

        }

        //add to recycle bin

        if (recycleBin.first == null) {

            recycleBin.first = p;

            p.prev = null;

            p.next = null;

        }

        else {

            p.next = recycleBin.first;

            recycleBin.first.prev = p;

            recycleBin.first = p;

            p.prev = null;

        }

    }

}

</script>

<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';">

<p>适用浏览器：360、FireFox、Chrome、Opera、傲游、搜狗、世界之窗. 不支持Safari、IE8及以下浏览器。</p>

</div>

</body>

</html>

canvas.min.js

/* Modernizr 2.6.2 (Custom Build) | MIT & BSD

 * Build: http://modernizr.com/download/#-fontface-backgroundsize-borderimage-borderradius-boxshadow-flexbox-hsla-multiplebgs-opacity-rgba-textshadow-cssanimations-csscolumns-generatedcontent-cssgradients-cssreflections-csstransforms-csstransforms3d-csstransitions-applicationcache-canvas-canvastext-draganddrop-hashchange-history-audio-video-indexeddb-input-inputtypes-localstorage-postmessage-sessionstorage-websockets-websqldatabase-webworkers-geolocation-inlinesvg-smil-svg-svgclippaths-touch-webgl-shiv-mq-cssclasses-addtest-prefixed-teststyles-testprop-testallprops-hasevent-prefixes-domprefixes-load

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如有错误，欢迎联系我改正，非常感谢！！！

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