【免费】1_xin.zip资源-CSDN文库

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docx：1个

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1_xin.zip （2个子文件）

xin.html 8KB

新建 Microsoft Word 文档.docx 18KB

<!doctype html>

<html>

<head>

<style>

html, body {

height: 100%;

padding: 0;

margin: 0;

background: #000;

}

canvas {

position: absolute;

width: 100%;

height: 100%;

}

</style>

</head>

<body>

* Settings

var settings = {

particles: {

length: 500, // maximum amount of particles

duration: 2, // particle duration in sec

velocity: 100, // particle velocity in pixels/sec

effect: -0.75, // play with this for a nice effect

size: 30, // particle size in pixels

};

* RequestAnimationFrame polyfill by Erik M?ller

(function(){var b=0;var c=["ms","moz","webkit","o"];for(var

a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=

window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"Can

celAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAni

mationFrame){window.requestAnimationFrame=function(h,e){var d=new

Date().getTime();var f=Math.max(0,16-(d-b));var

g=window.setTimeout(function(){h(d+f)},f);b=d+f;return

g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTime

out(d)}}}());

* Point class

var Point = (function() {

function Point(x, y) {

this.x = (typeof x !== 'undefined') ? x : 0;

this.y = (typeof y !== 'undefined') ? y : 0;

}

Point.prototype.clone = function() {

return new Point(this.x, this.y);

};

Point.prototype.length = function(length) {

if (typeof length == 'undefined')

return Math.sqrt(this.x * this.x + this.y * this.y);

this.normalize();

this.x *= length;

this.y *= length;

return this;

};

Point.prototype.normalize = function() {

var length = this.length();

this.x /= length;

this.y /= length;

return this;

};

return Point;

})();

* Particle class

var Particle = (function() {

function Particle() {

this.position = new Point();

this.velocity = new Point();

this.acceleration = new Point();

this.age = 0;

}

Particle.prototype.initialize = function(x, y, dx, dy) {

this.position.x = x;

this.position.y = y;

this.velocity.x = dx;

this.velocity.y = dy;

this.acceleration.x = dx * settings.particles.effect;

this.acceleration.y = dy * settings.particles.effect;

this.age = 0;

};

Particle.prototype.update = function(deltaTime) {

this.position.x += this.velocity.x * deltaTime;

this.position.y += this.velocity.y * deltaTime;

this.velocity.x += this.acceleration.x * deltaTime;

this.velocity.y += this.acceleration.y * deltaTime;

this.age += deltaTime;

};

Particle.prototype.draw = function(context, image) {

function ease(t) {

return (--t) * t * t + 1;

}

var size = image.width * ease(this.age / settings.particles.duration);

context.globalAlpha = 1 - this.age / settings.particles.duration;

context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);

};

return Particle;

})();

* ParticlePool class

var ParticlePool = (function() {

var particles,

firstActive = 0,

firstFree = 0,

duration = settings.particles.duration;

function ParticlePool(length) {

// create and populate particle pool

particles = new Array(length);

for (var i = 0; i < particles.length; i++)

particles[i] = new Particle();

}

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