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
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