jquery实现五彩烟花喷射动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：jquery实现五彩烟花喷射动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>

<style>
html, body{
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
}
.container{
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
	background-color: #000000;
}
</style>

</head>
<body>

<div id="jsi-fountain-container" class="container"></div>

<script>
var RENDERER = {
	GRAVITY : 0.05,
	BASE_RATE : 0.6,
	OFFSET_RATE : 1 / 50,
	PARTICLE_COUNT : 30,
	
	init : function(){
		this.setParameters();
		this.setup();
		this.reconstructMethods();
		this.bindEvent();
		this.render();
	},
	setParameters : function(){
		this.$window = $(window);
		this.$container = $('#jsi-fountain-container');
		this.$canvas = $('<canvas />');
		this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
		this.particles = [];
		this.fountains = [];
		this.resizeIds = [];
	},
	setup : function(){
		this.particles.length = 0;
		this.fountains.length = 0;
		this.resizeIds.length = 0;
		this.width = this.$container.width();
		this.height = this.$container.height();
		this.$canvas.attr({width : this.width, height : this.height});
		this.velocity = 1;
		
		while(true){
			var distance = 0,
				velocity = this.velocity;
				
			while(velocity >= 0){
				velocity -= this.GRAVITY;
				distance += velocity;
			}
			if(distance > Math.min(this.height * (this.BASE_RATE - this.OFFSET_RATE), 500)){
				this.velocity--;
				break;
			}
			this.velocity++;
		}
		this.gradient = this.context.createLinearGradient(0, this.height * this.BASE_RATE, 0, this.height);
		this.gradient.addColorStop(0, 'hsla(210, 80%, 5%, 0.5)');
		this.gradient.addColorStop(0.1, 'hsla(210, 80%, 5%, 0.8)');
		this.gradient.addColorStop(1, 'hsla(210, 80%, 5%, 1)');
		this.createElements();
	},
	createElements : function(){
		for(var i = 0, count = this.PARTICLE_COUNT * this.width / 500  * this.height / 500; i < count; i++){
			this.particles.push(new PARTICLE(this));
		}
		for(var i = -2; i <= 2; i++){
			this.fountains.push(new FOUNTAIN(this, this.width / 2 + i * Math.max(250, this.width / 5), this.height * (this.BASE_RATE - this.OFFSET_RATE), i));
		}
	},
	watchWindowSize : function(){
		while(this.resizeIds.length > 0){
			clearTimeout(this.resizeIds.pop());
		}
		this.tmpWidth = this.$window.width();
		this.tmpHeight = this.$window.height();
		this.resizeIds.push(setTimeout(this.jdugeToStopResize, this.RESIZE_INTERVAL));
	},
	jdugeToStopResize : function(){
		var width = this.$window.width(),
			height = this.$window.height(),
			stopped = (width == this.tmpWidth && height == this.tmpHeight);
			
		this.tmpWidth = width;
		this.tmpHeight = height;
		
		if(stopped){
			this.setup();
		}
	},
	reconstructMethods : function(){
		this.watchWindowSize = this.watchWindowSize.bind(this);
		this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
		this.render = this.render.bind(this);
	},
	bindEvent : function(){
		this.$window.on('resize', this.watchWindowSize);
	},
	getRandomValue : function(min, max){
		return min + (max - min) * Math.random();
	},
	render : function(){
		requestAnimationFrame(this.render);
		this.context.fillStyle = 'hsla(0, 0%, 0%, 0.3)';
		this.context.fillRect(0, 0, this.width, this.height);
		this.context.save();
		this.context.globalCompositeOperation = 'lighter';
		
		for(var i = 0, count = this.particles.length; i < count; i++){
			this.particles[i].render(this.context);
		}
		for(var i = 0, count = this.fountains.length; i < count; i++){
			this.fountains[i].render(this.context);
		}
		this.context.restore();
		this.context.save();
		this.context.translate(0, this.height * this.BASE_RATE);
		this.context.scale(1, -(1 - this.BASE_RATE) / this.BASE_RATE);
		this.context.drawImage(this.$canvas.get(0), 0, 0, this.width, this.height * this.BASE_RATE, 0,  -this.height * this.BASE_RATE, this.width, this.height * this.BASE_RATE);
		this.context.restore();
		this.context.fillStyle = this.gradient;
		this.context.fillRect(0, this.height * this.BASE_RATE, this.width, this.height * (1 - this.BASE_RATE));
	}
};
var PARTICLE = function(renderer){
	this.renderer = renderer;
	this.init();
};
PARTICLE.prototype = {
	THRESHOLD : 10,
	
	init : function(){
		this.x = this.renderer.getRandomValue(-this.THRESHOLD, this.renderer.width + this.THRESHOLD);
		this.y = this.renderer.getRandomValue(-this.THRESHOLD, this.renderer.height * this.renderer.BASE_RATE + this.THRESHOLD);
		this.vx = this.renderer.getRandomValue(-0.3, 0.3);
		this.vy = this.renderer.getRandomValue(-0.3, 0.3);
		this.theta = this.renderer.getRandomValu.........完整代码请登录后点击上方下载按钮下载查看