刘一辰的软件工程随笔

/**

 * Particleground

 *

 * @author Jonathan Nicol - @mrjnicol

 * @version 1.0.1

 * @description Creates a canvas based particle system background

 *

 * Inspired by:

 * http://requestlab.fr/

 * http://disruptivebydesign.com/

 *

 * @license The MIT License (MIT)

 *

 * Copyright (c) 2014 Jonathan Nicol - @mrjnicol

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

!function(a){function b(b,d){function e(){if(w){$canvas=a('<canvas class="pg-canvas"></canvas>'),v.prepend($canvas),p=$canvas[0],q=p.getContext("2d"),f();for(var b=Math.round(p.width*p.height/d.density),c=0;b>c;c++){var e=new l;e.setStackPos(c),x.push(e)}a(window).on("resize",function(){h()}),a(document).on("mousemove",function(a){y=a.pageX,z=a.pageY}),B&&!A&&window.addEventListener("deviceorientation",function(){D=Math.min(Math.max(-event.beta,-30),30),C=Math.min(Math.max(-event.gamma,-30),30)},!0),g(),o("onInit")}}function f(){p.width=v.width(),p.height=v.height(),q.fillStyle=d.dotColor,q.strokeStyle=d.lineColor,q.lineWidth=d.lineWidth}function g(){if(w){s=a(window).width(),t=a(window).height(),q.clearRect(0,0,p.width,p.height);for(var b=0;b<x.length;b++)x[b].updatePosition();for(var b=0;b<x.length;b++)x[b].draw();E||(r=requestAnimationFrame(g))}}function h(){for(f(),i=x.length-1;i>=0;i--)(x[i].position.x>v.width()||x[i].position.y>v.height())&&x.splice(i,1);var a=Math.round(p.width*p.height/d.density);if(a>x.length)for(;a>x.length;){var b=new l;x.push(b)}else a<x.length&&x.splice(a);for(i=x.length-1;i>=0;i--)x[i].setStackPos(i)}function j(){E=!0}function k(){E=!1,g()}function l(){switch(this.stackPos,this.active=!0,this.layer=Math.ceil(3*Math.random()),this.parallaxOffsetX=0,this.parallaxOffsetY=0,this.position={x:Math.ceil(Math.random()*p.width),y:Math.ceil(Math.random()*p.height)},this.speed={},d.directionX){case"left":this.speed.x=+(-d.maxSpeedX+Math.random()*d.maxSpeedX-d.minSpeedX).toFixed(2);break;case"right":this.speed.x=+(Math.random()*d.maxSpeedX+d.minSpeedX).toFixed(2);break;default:this.speed.x=+(-d.maxSpeedX/2+Math.random()*d.maxSpeedX).toFixed(2),this.speed.x+=this.speed.x>0?d.minSpeedX:-d.minSpeedX}switch(d.directionY){case"up":this.speed.y=+(-d.maxSpeedY+Math.random()*d.maxSpeedY-d.minSpeedY).toFixed(2);break;case"down":this.speed.y=+(Math.random()*d.maxSpeedY+d.minSpeedY).toFixed(2);break;default:this.speed.y=+(-d.maxSpeedY/2+Math.random()*d.maxSpeedY).toFixed(2),this.speed.x+=this.speed.y>0?d.minSpeedY:-d.minSpeedY}}function m(a,b){return b?void(d[a]=b):d[a]}function n(){v.find(".pg-canvas").remove(),o("onDestroy"),v.removeData("plugin_"+c)}function o(a){void 0!==d[a]&&d[a].call(u)}var p,q,r,s,t,u=b,v=a(b),w=!!document.createElement("canvas").getContext,x=[],y=0,z=0,A=!navigator.userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry|BB10|mobi|tablet|opera mini|nexus 7)/i),B=!!window.DeviceOrientationEvent,C=0,D=0,E=!1;return d=a.extend({},a.fn[c].defaults,d),l.prototype.draw=function(){q.beginPath(),q.arc(this.position.x+this.parallaxOffsetX,this.position.y+this.parallaxOffsetY,d.particleRadius/2,0,2*Math.PI,!0),q.closePath(),q.fill(),q.beginPath();for(var a=x.length-1;a>this.stackPos;a--){var b=x[a],c=this.position.x-b.position.x,e=this.position.y-b.position.y,f=Math.sqrt(c*c+e*e).toFixed(2);f<d.proximity&&(q.moveTo(this.position.x+this.parallaxOffsetX,this.position.y+this.parallaxOffsetY),d.curvedLines?q.quadraticCurveTo(Math.max(b.position.x,b.position.x),Math.min(b.position.y,b.position.y),b.position.x+b.parallaxOffsetX,b.position.y+b.parallaxOffsetY):q.lineTo(b.position.x+b.parallaxOffsetX,b.position.y+b.parallaxOffsetY))}q.stroke(),q.closePath()},l.prototype.updatePosition=function(){if(d.parallax){if(B&&!A){var a=(s-0)/60;pointerX=(C- -30)*a+0;var b=(t-0)/60;pointerY=(D- -30)*b+0}else pointerX=y,pointerY=z;this.parallaxTargX=(pointerX-s/2)/(d.parallaxMultiplier*this.layer),this.parallaxOffsetX+=(this.parallaxTargX-this.parallaxOffsetX)/10,this.parallaxTargY=(pointerY-t/2)/(d.parallaxMultiplier*this.layer),this.parallaxOffsetY+=(this.parallaxTargY-this.parallaxOffsetY)/10}switch(d.directionX){case"left":this.position.x+this.speed.x+this.parallaxOffsetX<0&&(this.position.x=v.width()-this.parallaxOffsetX);break;case"right":this.position.x+this.speed.x+this.parallaxOffsetX>v.width()&&(this.position.x=0-this.parallaxOffsetX);break;default:(this.position.x+this.speed.x+this.parallaxOffsetX>v.width()||this.position.x+this.speed.x+this.parallaxOffsetX<0)&&(this.speed.x=-this.speed.x)}switch(d.directionY){case"up":this.position.y+this.speed.y+this.parallaxOffsetY<0&&(this.position.y=v.height()-this.parallaxOffsetY);break;case"down":this.position.y+this.speed.y+this.parallaxOffsetY>v.height()&&(this.position.y=0-this.parallaxOffsetY);break;default:(this.position.y+this.speed.y+this.parallaxOffsetY>v.height()||this.position.y+this.speed.y+this.parallaxOffsetY<0)&&(this.speed.y=-this.speed.y)}this.position.x+=this.speed.x,this.position.y+=this.speed.y},l.prototype.setStackPos=function(a){this.stackPos=a},e(),{option:m,destroy:n,start:k,pause:j}}var c="particleground";a.fn[c]=function(d){if("string"==typeof arguments[0]){var e,f=arguments[0],g=Array.prototype.slice.call(arguments,1);return this.each(function(){a.data(this,"plugin_"+c)&&"function"==typeof a.data(this,"plugin_"+c)[f]&&(e=a.data(this,"plugin_"+c)[f].apply(this,g))}),void 0!==e?e:this}return"object"!=typeof d&&d?void 0:this.each(function(){a.data(this,"plugin_"+c)||a.data(this,"plugin_"+c,new b(this,d))})},a.fn[c].defaults={minSpeedX:.1,maxSpeedX:.7,minSpeedY:.1,maxSpeedY:.7,directionX:"center",directionY:"center",density:1e4,dotColor:"#666666",lineColor:"#666666",particleRadius:7,lineWidth:1,curvedLines:!1,proximity:100,parallax:!0,parallaxMultiplier:5,onInit:function(){},onDestroy:function(){}}}(jQuery),/**

 * requestAnimationFrame polyfill by Erik M枚ller. fixes from Paul Irish and Tino Zijdel

 * @see: http://paulirish.com/2011/requestanimationframe-for-smart-animating/

 * @see: http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

 * @license: MIT license

 */

function(){for(var a=0,b=["ms","moz","webkit","o"],c=0;c<b.length&&!window.requestAnimationFrame;++c)window.requestAnimationFrame=window[b[c]+"RequestAnimationFrame"],window.cancelAnimationFrame=window[b[c]+"CancelAnimationFrame"]||window[b[c]+"CancelRequestAnimationFrame"];window.requestAnimationFrame||(window.requestAnimationFrame=function(b){var c=(new Date).getTime(),d=Math.max(0,16-(c-a)),e=window.setTimeout(function(){b(c+d)},d);return a=c+d,e}),window.cancelAnimationFrame||(window.cancelAnimationFrame=function(a){clearTimeout(a)})}();

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title>header</title>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<style>

html,body{background:#626262;margin:0;padding:0;height:100%;position:relative;}

body img{margin-top:50%;}

</style>

<script type="text/javascript" language="JavaScript">

<!--

var pic = new Image();

pic.src="images/arrow_right.gif";

 

function toggleMenu()

{

  frmBody = parent.document.getElementById('frame-body');

  imgArrow = document.getElementById('img');

 

  if (frmBody.cols == "0, 10, *")

  {

    frmBody.cols="200, 10, *";

    imgArrow.src = "images/arrow_left.gif";

  }

  else

  {

    frmBody.cols="0, 10, *";

    imgArrow.src = "images/arrow_right.gif";

  }

}

 

var orgX = 0;

document.onmousedown = function(e)

{

  var evt = Utils.fixEvent(e);

  orgX = evt.clientX;

 

  if (Browser.isIE) document.getElementById('tbl').setCapture();

};

 

document.onmouseup = function(e)

{

  var evt = Utils.fixEvent(e);

 

  frmBody = parent.document.getElementById('frame-body');

  frmWidth = frmBody.cols.substr(0, frmBody.cols.indexOf(','));

  frmWidth = (parseInt(frmWidth) + (evt.clientX - orgX));

 

  frmBody.cols = frmWidth + ", 10, *";

 

  if (Browser.isIE) document.releaseCapture();

};

 

var Browser = new Object();

 

Browser.isMozilla = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined') && (typeof HTMLDocument != 'undefined');

Browser.isIE = window.ActiveXObject ? true : false;

Browser.isFirefox = (navigator.userAgent.toLowerCase().indexOf("firefox") != - 1);

Browser.isSafari = (navigator.userAgent.toLowerCase().indexOf("safari") != - 1);

Browser.isOpera = (navigator.userAgent.toLowerCase().indexOf("opera") != - 1);

 

var Utils = new Object();

 

Utils.fixEvent = function(e)

{

  var evt = (typeof e == "undefined") ? window.event : e;

  return evt;

};

//-->

</script>

</head>

<body onselect="return false;">

<table height="100%" cellspacing="0" cellpadding="0" id="tbl">

  <tbody><tr><td><a href="javascript:toggleMenu();"><img src="images/arrow_left.gif" width="10" height="30" id="img" border="0"></a></td></tr>

</tbody></table>

 

</body>

</html>

 

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Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian

 

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