利用h5实现Canvas粒子图形变形动画特效



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特效描述:利用h5实现 Canvas 粒子图形变形 动画特效,利用h5实现Canvas粒子图形变形动画特效

代码结构

1. 引入JS

<script type="text/javascript" src="js/jquery.min.js"></script>

2. HTML代码

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



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