<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>动态粒子效果</title> <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script> <style> 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="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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