【视觉体验】
【源代码】
<!doctype html> <html> <head> <meta charset="utf-8"> <title>HTML5 Canvas 3D粒子图形动画</title> <script type="text/javascript" src="http://www.codesc.net/ajaxjs/jquery-1.9.1.min.js"></script> <style> html,body { width: 100%; height: 100%; margin: 0; padding: 0; background-color: #000000; } .container{ width: 100％; height: 100%; margin: 0; padding: 0; background-color: #000000; }</style> </head> <body> <div id="jsi-particle-container" class="container"></div> <script> var RENDERER = { PARTICLE_COUNT : 1000, PARTICLE_RADIUS : 1, MAX_ROTATION_ANGLE : Math.PI / 60, TRANSLATION_COUNT : 500, init : function(strategy){ this.setParameters(strategy); this.createParticles(); this.setupFigure(); this.reconstructMethod(); this.bindEvent(); this.drawFigure(); }, setParameters : function(strategy){ this.$window = $(window); this.$container = $('#jsi-particle-container'); this.width = this.$container.width(); this.height = this.$container.height(); this.$canvas = $('<canvas />').attr({width : this.width, height : this.height}).appendTo(this.$container); this.context = this.$canvas.get(0).getContext('2d'); this.center = {x : this.width / 2, y : this.height / 2}; this.rotationX = this.MAX_ROTATION_ANGLE; this.rotationY = this.MAX_ROTATION_ANGLE; this.strategyIndex = 0; this.translationCount = 0; this.theta = 0; this.strategies = strategy.getStrategies(); this.particles = []; }, createParticles : function(){ for(var i = 0; i < this.PARTICLE_COUNT; i ++){ this.particles.push(new PARTICLE(this.center)); } }, reconstructMethod : function(){ this.setupFigure = this.setupFigure.bind(this); this.drawFigure = this.drawFigure.bind(this); this.changeAngle = this.changeAngle.bind(this); }, bindEvent : function(){ this.$container.on('click', this.setupFigure); this.$container.on('mousemove', this.changeAngle); }, changeAngle : function(event){ var offset = this.$container.offset(), x = event.clientX - offset.left + this.$window.scrollLeft(), y = event.clientY - offset.top + this.$window.scrollTop(); this.rotationX = (this.center.y - y) / this.center.y * this.MAX_ROTATION_ANGLE; this.rotationY = (this.center.x - x) / this.center.x * this.MAX_ROTATION_ANGLE; }, setupFigure : function(){ for(var i = 0, length = this.particles.length; i < length; i++){ this.particles[i].setAxis(this.strategies[this.strategyIndex]()); } if(++this.strategyIndex == this.strategies.length){ this.strategyIndex = 0; } this.translationCount = 0; }, drawFigure : function(){ requestAnimationFrame(this.drawFigure); this.context.fillStyle = 'rgba(0, 0, 0, 0.2)'; this.context.fillRect(0, 0, this.width, this.height); for(var i = 0, length = this.particles.length; i < length; i++){ var axis = this.particles[i].getAxis2D(this.theta); this.context.beginPath(); this.context.fillStyle = axis.color; this.context.arc(axis.x, axis.y, this.PARTICLE_RADIUS, 0, Math.PI * 2, false); this.context.fill(); } this.theta++; this.theta %= 360; for(var i = 0, length = this.particles.length; i < length; i++){ this.particles[i].rotateX(this.rotationX); this.particles[i].rotateY(this.rotationY); } this.translationCount++; this.translationCount %= this.TRANSLATION_COUNT; if(this.translationCount == 0){ this.setupFigure(); } } }; var STRATEGY = { SCATTER_RADIUS :150, CONE_ASPECT_RATIO : 1.5, RING_COUNT : 5, getStrategies : function(){ var strategies = []; for(var i in this){ if(this[i] == arguments.callee || typeof this[i] != 'function'){ continue; } strategies.push(this[i].bind(this)); } return strategies; }, createSphere : function(){ var cosTheta = Math.random() * 2 - 1, sinTheta = Math.sqrt(1 - cosTheta * cosTheta), phi = Math.random() * 2 * Math.PI; return { x : this.SCATTER_RADIUS * sinTheta * Math.cos(phi), y : this.SCATTER_RADIUS * sinTheta * Math.sin(phi), z : this.SCATTER_RADIUS * cosTheta, hue : Math.round(phi / Math.PI * 30) }; }, createTorus : function(){ var theta = Math.random() * Math.PI * 2, x = this.SCATTER_RADIUS + this.SCATTER_RADIUS / 6 * Math.cos(theta), y = this.SCATTER_RADIUS / 6 * Math.sin(theta), phi = Math.random() * Math.PI * 2; return { x : x * Math.cos(phi), y : y, z : x * Math.sin(phi), hue : Math.round(phi / Math.PI * 30) }; }, createCone : function(){ var status = Math.random() > 1 / 3, x, y, phi = Math.random() * Math.PI * 2, rate = Math.tan(30 / 180 * Math.PI) / this.CONE_ASPECT_RATIO; if(status){ y = this.SCATTER_RADIUS * (1 - Math.random() * 2); x = (this.SCATTER_RADIUS - y) * rate; }else{ y = -this.SCATTER_RADIUS; x = this.SCATTER_RADIUS * 2 * rate * Math.random(); } return { x : x * Math.cos(phi), y : y, z : x * Math.sin(phi), hue : Math.round(phi / Math.PI * 30) }; }, createVase : function(){ var theta = Math.random() * Math.PI, x = Math.abs(this.SCATTER_RADIUS * Math.cos(theta) / 2) + this.SCATTER_RADIUS / 8, y = this.SCATTER_RADIUS * Math.cos(theta) * 1.2, phi = Math.random() * Math.PI * 2; return { x : x * Math.cos(phi), y : y, z : x * Math.sin(phi), hue : Math.round(phi / Math.PI * 30) }; } }; var PARTICLE = function(center){ this.center = center; this.init(); }; PARTICLE.prototype = { SPRING : 0.01, FRICTION : 0.9, FOCUS_POSITION : 300, COLOR : 'hsl(%hue, 100%, 70%)', init : function(){ this.x = 0; this.y = 0; this.z = 0; this.vx = 0; this.vy = 0; this.vz = 0; this.color; }, setAxis : function(axis){ this.translating = true; this.nextX = axis.x; this.nextY = axis.y; this.nextZ = axis.z; this.hue = axis.hue; }, rotateX : function(angle){ var sin = Math.sin(angle), cos = Math.cos(angle), nextY = this.nextY * cos - this.nextZ * sin, nextZ = this.nextZ * cos + this.nextY * sin, y = this.y * cos - this.z * sin, z = this.z * cos + this.y * sin; this.nextY = nextY; this.nextZ = nextZ; this.y = y; this.z = z; }, rotateY : function(angle){ var sin = Math.sin(angle), cos = Math.cos(angle), nextX = this.nextX * cos - this.nextZ * sin, nextZ = this.nextZ * cos + this.nextX * sin, x = this.x * cos - this.z * sin, z = this.z * cos + this.x * sin; this.nextX = nextX; this.nextZ = nextZ; this.x = x; this.z = z; }, rotateZ : function(angle){ var sin = Math.sin(angle), cos = Math.cos(angle), nextX = this.nextX * cos - this.nextY * sin, nextY = this.nextY * cos + this.nextX * sin, x = this.x * cos - this.y * sin, y = this.y * cos + this.x * sin; this.nextX = nextX; this.nextY = nextY; this.x = x; this.y = y; }, getAxis3D : function(){ this.vx += (this.nextX - this.x) * this.SPRING; this.vy += (this.nextY - this.y) * this.SPRING; this.vz += (this.nextZ - this.z) * this.SPRING; this.vx *= this.FRICTION; this.vy *= this.FRICTION; this.vz *= this.FRICTION; this.x += this.vx; this.y += this.vy; this.z += this.vz; return {x : this.x, y : this.y, z : this.z}; }, getAxis2D : function(theta){ var axis = this.getAxis3D(), scale = this.FOCUS_POSITION / (this.FOCUS_POSITION + axis.z); return {x : this.center.x + axis.x * scale, y : this.center.y - axis.y * scale, color : this.COLOR.replace('%hue', this.hue + theta)}; } }; $(function(){ RENDERER.init(STRATEGY); }); </script> </body> </html>
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