H5炫酷特效系列4——炫酷粒子变化特效

这个示例虽然没有相对比较实用的特性，但是表现出来的效果确实非常震撼眼球。先上效果图，让各位同胞感受一下：

特效的表现感很强，有兴趣的读者可以仔细学习一下下面的代码，尝试着理解其中的逻辑。

<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>炫酷粒子变换特效</title><style type="text/css">html,body {width: 100%;height: 100%;margin: 0;padding: 0;overflow: hidden;}.container {width: 100％;height: 100%;margin: 0;padding: 0;background-color: #000000;}</style>
</head><body><div id="container" class="container"></div><script src="https://code.jquery.com/jquery-3.2.1.min.js"></script><script type="text/javascript">var RENDERER = {PARTICLE_COUNT: 1500,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 = $('#container');this.width = this.$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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