HTML5超炫酷粒子效果的進度條圖文代碼詳細介紹

/*========================================================*/ 
/* Light Loader
/*========================================================*/
var lightLoader = function(c, cw, ch){

	var _this = this;
	this.c = c;
	this.ctx = c.getContext('2d');
	this.cw = cw;
	this.ch = ch;	

	this.loaded = 0;
	this.loaderSpeed = .6;
	this.loaderHeight = 10;
	this.loaderWidth = 310;	
	this.loader = {
	x: (this.cw/2) - (this.loaderWidth/2),
	y: (this.ch/2) - (this.loaderHeight/2)
	};
	this.particles = [];
	this.particleLift = 180;
	this.hueStart = 0
	this.hueEnd = 120;
	this.hue = 0;
	this.gravity = .15;
	this.particleRate = 4;	

	/*========================================================*/	
	/* Initialize
	/*========================================================*/
	this.init = function(){
	this.loop();
	};

	/*========================================================*/	
	/* Utility Functions
	/*========================================================*/	
	this.rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);};
	this.hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);};

	/*========================================================*/	
	/* Update Loader
	/*========================================================*/
	this.updateLoader = function(){
	if(this.loaded < 100){
	this.loaded += this.loaderSpeed;
	} else {
	this.loaded = 0;
	}
	};

	/*========================================================*/	
	/* Render Loader
	/*========================================================*/
	this.renderLoader = function(){
	this.ctx.fillStyle = '#000';
	this.ctx.fillRect(this.loader.x, this.loader.y, this.loaderWidth, this.loaderHeight);

	this.hue = this.hueStart + (this.loaded/100)*(this.hueEnd - this.hueStart);

	var newWidth = (this.loaded/100)*this.loaderWidth;
	this.ctx.fillStyle = 'hsla('+this.hue+', 100%, 40%, 1)';
	this.ctx.fillRect(this.loader.x, this.loader.y, newWidth, this.loaderHeight);

	this.ctx.fillStyle = '#222';
	this.ctx.fillRect(this.loader.x, this.loader.y, newWidth, this.loaderHeight/2);
	};	

	/*========================================================*/	
	/* Particles
	/*========================================================*/
	this.Particle = function(){	
	this.x = _this.loader.x + ((_this.loaded/100)*_this.loaderWidth) - _this.rand(0, 1);
	this.y = _this.ch/2 + _this.rand(0,_this.loaderHeight)-_this.loaderHeight/2;
	this.vx = (_this.rand(0,4)-2)/100;
	this.vy = (_this.rand(0,_this.particleLift)-_this.particleLift*2)/100;
	this.width = _this.rand(1,4)/2;
	this.height = _this.rand(1,4)/2;
	this.hue = _this.hue;
	};

	this.Particle.prototype.update = function(i){
	this.vx += (_this.rand(0,6)-3)/100; 
	this.vy += _this.gravity;
	this.x += this.vx;
	this.y += this.vy;

	if(this.y > _this.ch){
	_this.particles.splice(i, 1);
	}	
	};

	this.Particle.prototype.render = function(){
	_this.ctx.fillStyle = 'hsla('+this.hue+', 100%, '+_this.rand(50,70)+'%, '+_this.rand(20,100)/100+')';
	_this.ctx.fillRect(this.x, this.y, this.width, this.height);
	};

	this.createParticles = function(){
	var i = this.particleRate;
	while(i--){
	this.particles.push(new this.Particle());
	};
	};

	this.updateParticles = function(){	
	var i = this.particles.length;	
	while(i--){
	var p = this.particles[i];
	p.update(i);	
	};	
	};

	this.renderParticles = function(){
	var i = this.particles.length;	
	while(i--){
	var p = this.particles[i];
	p.render();	
	};	
	};

	/*========================================================*/	
	/* Clear Canvas
	/*========================================================*/
	this.clearCanvas = function(){
	this.ctx.globalCompositeOperation = 'source-over';
	this.ctx.clearRect(0,0,this.cw,this.ch);	
	this.ctx.globalCompositeOperation = 'lighter';
	};

	/*========================================================*/	
	/* Animation Loop
	/*========================================================*/
	this.loop = function(){
	var loopIt = function(){
	requestAnimationFrame(loopIt, _this.c);
	_this.clearCanvas();

	_this.createParticles();

	_this.updateLoader();
	_this.updateParticles();

	_this.renderLoader();
	_this.renderParticles();

	};
	loopIt();	
	};

};

/*========================================================*/	
/* Check Canvas Support
/*========================================================*/
var isCanvasSupported = function(){
	var elem = document.createElement('canvas');
	return !!(elem.getContext && elem.getContext('2d'));
};

/*========================================================*/	
/* Setup requestAnimationFrame
/*========================================================*/
var setupRAF = function(){
	var lastTime = 0;
	var vendors = ['ms', 'moz', 'webkit', 'o'];
	for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x){
	window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
	window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
	};

	if(!window.requestAnimationFrame){
	window.requestAnimationFrame = function(callback, element){
	var currTime = new Date().getTime();
	var timeToCall = Math.max(0, 16 - (currTime - lastTime));
	var id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);
	lastTime = currTime + timeToCall;
	return id;
	};
	};

	if (!window.cancelAnimationFrame){
	window.cancelAnimationFrame = function(id){
	clearTimeout(id);
	};
	};
};	

/*========================================================*/	
/* Define Canvas and Initialize
/*========================================================*/
if(isCanvasSupported){
 var c = document.createElement('canvas');
 c.width = 400;
 c.height = 100;	
 var cw = c.width;
 var ch = c.height;	
 document.body.appendChild(c);	
 var cl = new lightLoader(c, cw, ch);	

 setupRAF();
 cl.init();
}