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/** @license
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 * DHTML Snowstorm! JavaScript-based snow for web pages
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 * Making it snow on the internets since 2003. You're welcome.
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 * -----------------------------------------------------------
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 * Version 1.44.20131208 (Previous rev: 1.44.20131125)
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 * Copyright (c) 2007, Scott Schiller. All rights reserved.
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 * Code provided under the BSD License
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 * http://schillmania.com/projects/snowstorm/license.txt
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 */
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/*jslint nomen: true, plusplus: true, sloppy: true, vars: true, white: true */
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/*global window, document, navigator, clearInterval, setInterval */
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var snowStorm = (function(window, document) {
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  // --- common properties ---
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  this.autoStart = true;          // Whether the snow should start automatically or not.
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  this.excludeMobile = true;      // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) Enable at your own risk.
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  this.flakesMax = 128;           // Limit total amount of snow made (falling + sticking)
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  this.flakesMaxActive = 64;      // Limit amount of snow falling at once (less = lower CPU use)
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  this.animationInterval = 33;    // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
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  this.useGPU = true;             // Enable transform-based hardware acceleration, reduce CPU load.
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  this.className = null;          // CSS class name for further customization on snow elements
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  this.excludeMobile = true;      // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) By default, be nice.
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  this.flakeBottom = null;        // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
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  this.followMouse = true;        // Snow movement can respond to the user's mouse
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  this.snowColor = '#000';        // Don't eat (or use?) yellow snow.
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  this.snowCharacter = '//charatrp.com/static/favicon.ico';  // • = bullet, · is square on some systems etc.
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  this.snowStick = true;          // Whether or not snow should "stick" at the bottom. When off, will never collect.
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  this.targetElement = null;      // element which snow will be appended to (null = document.body) - can be an element ID eg. 'myDiv', or a DOM node reference
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  this.useMeltEffect = true;      // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
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  this.useTwinkleEffect = false;  // Allow snow to randomly "flicker" in and out of view while falling
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  this.usePositionFixed = false;  // true = snow does not shift vertically when scrolling. May increase CPU load, disabled by default - if enabled, used only where supported
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  this.usePixelPosition = false;  // Whether to use pixel values for snow top/left vs. percentages. Auto-enabled if body is position:relative or targetElement is specified.
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  // --- less-used bits ---
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  this.freezeOnBlur = true;       // Only snow when the window is in focus (foreground.) Saves CPU.
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  this.flakeLeftOffset = 0;       // Left margin/gutter space on edge of container (eg. browser window.) Bump up these values if seeing horizontal scrollbars.
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  this.flakeRightOffset = 0;      // Right margin/gutter space on edge of container
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  this.flakeWidth = 8;            // Max pixel width reserved for snow element
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  this.flakeHeight = 8;           // Max pixel height reserved for snow element
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  this.vMaxX = 5;                 // Maximum X velocity range for snow
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  this.vMaxY = 4;                 // Maximum Y velocity range for snow
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  this.zIndex = 0;                // CSS stacking order applied to each snowflake
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  // --- "No user-serviceable parts inside" past this point, yadda yadda ---
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  var storm = this,
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  features,
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  // UA sniffing and backCompat rendering mode checks for fixed position, etc.
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  isIE = navigator.userAgent.match(/msie/i),
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  isIE6 = navigator.userAgent.match(/msie 6/i),
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  isMobile = navigator.userAgent.match(/mobile|opera m(ob|in)/i),
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  isBackCompatIE = (isIE && document.compatMode === 'BackCompat'),
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  noFixed = (isBackCompatIE || isIE6),
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  screenX = null, screenX2 = null, screenY = null, scrollY = null, docHeight = null, vRndX = null, vRndY = null,
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  windOffset = 1,
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  windMultiplier = 2,
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  flakeTypes = 6,
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  fixedForEverything = false,
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  targetElementIsRelative = false,
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  opacitySupported = (function(){
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    try {
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      document.createElement('div').style.opacity = '0.5';
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    } catch(e) {
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      return false;
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    }
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    return true;
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  }()),
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  didInit = false,
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  docFrag = document.createDocumentFragment();
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  features = (function() {
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    var getAnimationFrame;
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    /**
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     * hat tip: paul irish
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     * http://paulirish.com/2011/requestanimationframe-for-smart-animating/
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     * https://gist.github.com/838785
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     */
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    function timeoutShim(callback) {
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      window.setTimeout(callback, 1000/(storm.animationInterval || 20));
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    }
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    var _animationFrame = (window.requestAnimationFrame ||
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        window.webkitRequestAnimationFrame ||
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        window.mozRequestAnimationFrame ||
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        window.oRequestAnimationFrame ||
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        window.msRequestAnimationFrame ||
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        timeoutShim);
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    // apply to window, avoid "illegal invocation" errors in Chrome
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    getAnimationFrame = _animationFrame ? function() {
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      return _animationFrame.apply(window, arguments);
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    } : null;
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    var testDiv;
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    testDiv = document.createElement('div');
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    function has(prop) {
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      // test for feature support
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      var result = testDiv.style[prop];
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      return (result !== undefined ? prop : null);
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    }
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    // note local scope.
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    var localFeatures = {
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      transform: {
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        ie:  has('-ms-transform'),
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        moz: has('MozTransform'),
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        opera: has('OTransform'),
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        webkit: has('webkitTransform'),
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        w3: has('transform'),
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        prop: null // the normalized property value
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      },
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      getAnimationFrame: getAnimationFrame
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    };
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    localFeatures.transform.prop = (
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      localFeatures.transform.w3 || 
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      localFeatures.transform.moz ||
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      localFeatures.transform.webkit ||
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      localFeatures.transform.ie ||
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      localFeatures.transform.opera
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    );
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    testDiv = null;
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    return localFeatures;
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  }());
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  this.timer = null;
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  this.flakes = [];
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  this.disabled = false;
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  this.active = false;
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  this.meltFrameCount = 20;
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  this.meltFrames = [];
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  this.setXY = function(o, x, y) {
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    if (!o) {
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      return false;
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    }
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    if (storm.usePixelPosition || targetElementIsRelative) {
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      o.style.left = (x - storm.flakeWidth) + 'px';
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      o.style.top = (y - storm.flakeHeight) + 'px';
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    } else if (noFixed) {
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      o.style.right = (100-(x/screenX*100)) + '%';
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      // avoid creating vertical scrollbars
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      o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px';
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    } else {
168
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      if (!storm.flakeBottom) {
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        // if not using a fixed bottom coordinate...
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        o.style.right = (100-(x/screenX*100)) + '%';
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        o.style.bottom = (100-(y/screenY*100)) + '%';
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      } else {
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        // absolute top.
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        o.style.right = (100-(x/screenX*100)) + '%';
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        o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px';
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      }
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    }
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  };
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  this.events = (function() {
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    var old = (!window.addEventListener && window.attachEvent), slice = Array.prototype.slice,
190
    evt = {
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      add: (old?'attachEvent':'addEventListener'),
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      remove: (old?'detachEvent':'removeEventListener')
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    };
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    function getArgs(oArgs) {
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      var args = slice.call(oArgs), len = args.length;
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      if (old) {
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        args[1] = 'on' + args[1]; // prefix
199
        if (len > 3) {
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          args.pop(); // no capture
201
        }
202
      } else if (len === 3) {
203
        args.push(false);
204
      }
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      return args;
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    }
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    function apply(args, sType) {
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      var element = args.shift(),
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          method = [evt[sType]];
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      if (old) {
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        element[method](args[0], args[1]);
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      } else {
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        element[method].apply(element, args);
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      }
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    }
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    function addEvent() {
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      apply(getArgs(arguments), 'add');
220
    }
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    function removeEvent() {
223
      apply(getArgs(arguments), 'remove');
224
    }
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    return {
227
      add: addEvent,
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      remove: removeEvent
229
    };
230
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  }());
232
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  function rnd(n,min) {
234
    if (isNaN(min)) {
235
      min = 0;
236
    }
237
    return (Math.random()*n)+min;
238
  }
239
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  function plusMinus(n) {
241
    return (parseInt(rnd(2),10)===1?n*-1:n);
242
  }
243
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  this.randomizeWind = function() {
245
    var i;
246
    vRndX = plusMinus(rnd(storm.vMaxX,0.2));
247
    vRndY = rnd(storm.vMaxY,0.2);
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    if (this.flakes) {
249
      for (i=0; i<this.flakes.length; i++) {
250
        if (this.flakes[i].active) {
251
          this.flakes[i].setVelocities();
252
        }
253
      }
254
    }
255
  };
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257
  this.scrollHandler = function() {
258
    var i;
259
    // "attach" snowflakes to bottom of window if no absolute bottom value was given
260
    scrollY = (storm.flakeBottom ? 0 : parseInt(window.scrollY || document.documentElement.scrollTop || (noFixed ? document.body.scrollTop : 0), 10));
261
    if (isNaN(scrollY)) {
262
      scrollY = 0; // Netscape 6 scroll fix
263
    }
264
    if (!fixedForEverything && !storm.flakeBottom && storm.flakes) {
265
      for (i=0; i<storm.flakes.length; i++) {
266
        if (storm.flakes[i].active === 0) {
267
          storm.flakes[i].stick();
268
        }
269
      }
270
    }
271
  };
272
273
  this.resizeHandler = function() {
274
    if (window.innerWidth || window.innerHeight) {
275
      screenX = window.innerWidth - 16 - storm.flakeRightOffset;
276
      screenY = (storm.flakeBottom || window.innerHeight);
277
    } else {
278
      screenX = (document.documentElement.clientWidth || document.body.clientWidth || document.body.scrollWidth) - (!isIE ? 8 : 0) - storm.flakeRightOffset;
279
      screenY = storm.flakeBottom || document.documentElement.clientHeight || document.body.clientHeight || document.body.scrollHeight;
280
    }
281
    docHeight = document.body.offsetHeight;
282
    screenX2 = parseInt(screenX/2,10);
283
  };
284
285
  this.resizeHandlerAlt = function() {
286
    screenX = storm.targetElement.offsetWidth - storm.flakeRightOffset;
287
    screenY = storm.flakeBottom || storm.targetElement.offsetHeight;
288
    screenX2 = parseInt(screenX/2,10);
289
    docHeight = document.body.offsetHeight;
290
  };
291
292
  this.freeze = function() {
293
    // pause animation
294
    if (!storm.disabled) {
295
      storm.disabled = 1;
296
    } else {
297
      return false;
298
    }
299
    storm.timer = null;
300
  };
301
302
  this.resume = function() {
303
    if (storm.disabled) {
304
       storm.disabled = 0;
305
    } else {
306
      return false;
307
    }
308
    storm.timerInit();
309
  };
310
311
  this.toggleSnow = function() {
312
    if (!storm.flakes.length) {
313
      // first run
314
      storm.start();
315
    } else {
316
      storm.active = !storm.active;
317
      if (storm.active) {
318
        storm.show();
319
        storm.resume();
320
      } else {
321
        storm.stop();
322
        storm.freeze();
323
      }
324
    }
325
  };
326
327
  this.stop = function() {
328
    var i;
329
    this.freeze();
330
    for (i=0; i<this.flakes.length; i++) {
331
      this.flakes[i].o.style.display = 'none';
332
    }
333
    storm.events.remove(window,'scroll',storm.scrollHandler);
334
    storm.events.remove(window,'resize',storm.resizeHandler);
335
    if (storm.freezeOnBlur) {
336
      if (isIE) {
337
        storm.events.remove(document,'focusout',storm.freeze);
338
        storm.events.remove(document,'focusin',storm.resume);
339
      } else {
340
        storm.events.remove(window,'blur',storm.freeze);
341
        storm.events.remove(window,'focus',storm.resume);
342
      }
343
    }
344
  };
345
346
  this.show = function() {
347
    var i;
348
    for (i=0; i<this.flakes.length; i++) {
349
      this.flakes[i].o.style.display = 'block';
350
    }
351
  };
352
353
  this.SnowFlake = function(type,x,y) {
354
    var s = this;
355
    this.type = type;
356
    this.x = x||parseInt(rnd(screenX-20),10);
357
    this.y = (!isNaN(y)?y:-rnd(screenY)-12);
358
    this.vX = null;
359
    this.vY = null;
360
    this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
361
    this.vAmp = this.vAmpTypes[this.type] || 1;
362
    this.melting = false;
363
    this.meltFrameCount = storm.meltFrameCount;
364
    this.meltFrames = storm.meltFrames;
365
    this.meltFrame = 0;
366
    this.twinkleFrame = 0;
367
    this.active = 1;
368
    this.fontSize = (10+(this.type/5)*10);
369
    this.o = document.createElement('div');
370
    if (storm.className) {
371
      this.o.setAttribute('class', storm.className);
372
    }
373
    this.o.style.color = storm.snowColor;
374
    this.o.style.position = (fixedForEverything?'fixed':'absolute');
375
    if (storm.useGPU && features.transform.prop) {
376
      // GPU-accelerated snow.
377
      this.o.style[features.transform.prop] = 'translate3d(0px, 0px, 0px)';
378
    }
379
    this.o.style.width = storm.flakeWidth+'px';
380
    this.o.style.backgroundImage = '//charatrp.com/static/favicon.ico';
381
    this.o.style.height = storm.flakeHeight+'px';
382
    this.o.style.fontFamily = 'arial,verdana';
383
    this.o.style.cursor = 'default';
384
    this.o.style.overflow = 'hidden';
385
    this.o.style.fontWeight = 'normal';
386-
    this.o.style.backgroundImage = storm.snowCharacter;
386+
387
    docFrag.appendChild(this.o);
388
389
    this.refresh = function() {
390
      if (isNaN(s.x) || isNaN(s.y)) {
391
        // safety check
392
        return false;
393
      }
394
      storm.setXY(s.o, s.x, s.y);
395
    };
396
397
    this.stick = function() {
398
      if (noFixed || (storm.targetElement !== document.documentElement && storm.targetElement !== document.body)) {
399
        s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
400
      } else if (storm.flakeBottom) {
401
        s.o.style.top = storm.flakeBottom+'px';
402
      } else {
403
        s.o.style.display = 'none';
404
        s.o.style.bottom = '0%';
405
        s.o.style.position = 'fixed';
406
        s.o.style.display = 'block';
407
      }
408
    };
409
410
    this.vCheck = function() {
411
      if (s.vX>=0 && s.vX<0.2) {
412
        s.vX = 0.2;
413
      } else if (s.vX<0 && s.vX>-0.2) {
414
        s.vX = -0.2;
415
      }
416
      if (s.vY>=0 && s.vY<0.2) {
417
        s.vY = 0.2;
418
      }
419
    };
420
421
    this.move = function() {
422
      var vX = s.vX*windOffset, yDiff;
423
      s.x += vX;
424
      s.y += (s.vY*s.vAmp);
425
      if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
426
        s.x = 0;
427
      } else if (vX < 0 && s.x-storm.flakeLeftOffset < -storm.flakeWidth) {
428
        s.x = screenX-storm.flakeWidth-1; // flakeWidth;
429
      }
430
      s.refresh();
431
      yDiff = screenY+scrollY-s.y+storm.flakeHeight;
432
      if (yDiff<storm.flakeHeight) {
433
        s.active = 0;
434
        if (storm.snowStick) {
435
          s.stick();
436
        } else {
437
          s.recycle();
438
        }
439
      } else {
440
        if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
441
          // ~1/1000 chance of melting mid-air, with each frame
442
          s.melting = true;
443
          s.melt();
444
          // only incrementally melt one frame
445
          // s.melting = false;
446
        }
447
        if (storm.useTwinkleEffect) {
448
          if (s.twinkleFrame < 0) {
449
            if (Math.random() > 0.97) {
450
              s.twinkleFrame = parseInt(Math.random() * 8, 10);
451
            }
452
          } else {
453
            s.twinkleFrame--;
454
            if (!opacitySupported) {
455
              s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 'hidden' : 'visible');
456
            } else {
457
              s.o.style.opacity = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 0 : 1);
458
            }
459
          }
460
        }
461
      }
462
    };
463
464
    this.animate = function() {
465
      // main animation loop
466
      // move, check status, die etc.
467
      s.move();
468
    };
469
470
    this.setVelocities = function() {
471
      s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
472
      s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
473
    };
474
475
    this.setOpacity = function(o,opacity) {
476
      if (!opacitySupported) {
477
        return false;
478
      }
479
      o.style.opacity = opacity;
480
    };
481
482
    this.melt = function() {
483
      if (!storm.useMeltEffect || !s.melting) {
484
        s.recycle();
485
      } else {
486
        if (s.meltFrame < s.meltFrameCount) {
487
          s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
488
          s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
489
          s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
490
          s.meltFrame++;
491
        } else {
492
          s.recycle();
493
        }
494
      }
495
    };
496
497
    this.recycle = function() {
498
      s.o.style.display = 'none';
499
      s.o.style.position = (fixedForEverything?'fixed':'absolute');
500
      s.o.style.bottom = 'auto';
501
      s.setVelocities();
502
      s.vCheck();
503
      s.meltFrame = 0;
504
      s.melting = false;
505
      s.setOpacity(s.o,1);
506
      s.o.style.padding = '0px';
507
      s.o.style.margin = '0px';
508
      s.o.style.fontSize = s.fontSize+'px';
509
      s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
510
      s.o.style.textAlign = 'center';
511
      s.o.style.verticalAlign = 'baseline';
512
      s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
513
      s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
514
      s.refresh();
515
      s.o.style.display = 'block';
516
      s.active = 1;
517
    };
518
519
    this.recycle(); // set up x/y coords etc.
520
    this.refresh();
521
522
  };
523
524
  this.snow = function() {
525
    var active = 0, flake = null, i, j;
526
    for (i=0, j=storm.flakes.length; i<j; i++) {
527
      if (storm.flakes[i].active === 1) {
528
        storm.flakes[i].move();
529
        active++;
530
      }
531
      if (storm.flakes[i].melting) {
532
        storm.flakes[i].melt();
533
      }
534
    }
535
    if (active<storm.flakesMaxActive) {
536
      flake = storm.flakes[parseInt(rnd(storm.flakes.length),10)];
537
      if (flake.active === 0) {
538
        flake.melting = true;
539
      }
540
    }
541
    if (storm.timer) {
542
      features.getAnimationFrame(storm.snow);
543
    }
544
  };
545
546
  this.mouseMove = function(e) {
547
    if (!storm.followMouse) {
548
      return true;
549
    }
550
    var x = parseInt(e.clientX,10);
551
    if (x<screenX2) {
552
      windOffset = -windMultiplier+(x/screenX2*windMultiplier);
553
    } else {
554
      x -= screenX2;
555
      windOffset = (x/screenX2)*windMultiplier;
556
    }
557
  };
558
559
  this.createSnow = function(limit,allowInactive) {
560
    var i;
561
    for (i=0; i<limit; i++) {
562
      storm.flakes[storm.flakes.length] = new storm.SnowFlake(parseInt(rnd(flakeTypes),10));
563
      if (allowInactive || i>storm.flakesMaxActive) {
564
        storm.flakes[storm.flakes.length-1].active = -1;
565
      }
566
    }
567
    storm.targetElement.appendChild(docFrag);
568
  };
569
570
  this.timerInit = function() {
571
    storm.timer = true;
572
    storm.snow();
573
  };
574
575
  this.init = function() {
576
    var i;
577
    for (i=0; i<storm.meltFrameCount; i++) {
578
      storm.meltFrames.push(1-(i/storm.meltFrameCount));
579
    }
580
    storm.randomizeWind();
581
    storm.createSnow(storm.flakesMax); // create initial batch
582
    storm.events.add(window,'resize',storm.resizeHandler);
583
    storm.events.add(window,'scroll',storm.scrollHandler);
584
    if (storm.freezeOnBlur) {
585
      if (isIE) {
586
        storm.events.add(document,'focusout',storm.freeze);
587
        storm.events.add(document,'focusin',storm.resume);
588
      } else {
589
        storm.events.add(window,'blur',storm.freeze);
590
        storm.events.add(window,'focus',storm.resume);
591
      }
592
    }
593
    storm.resizeHandler();
594
    storm.scrollHandler();
595
    if (storm.followMouse) {
596
      storm.events.add(isIE?document:window,'mousemove',storm.mouseMove);
597
    }
598
    storm.animationInterval = Math.max(20,storm.animationInterval);
599
    storm.timerInit();
600
  };
601
602
  this.start = function(bFromOnLoad) {
603
    if (!didInit) {
604
      didInit = true;
605
    } else if (bFromOnLoad) {
606
      // already loaded and running
607
      return true;
608
    }
609
    if (typeof storm.targetElement === 'string') {
610
      var targetID = storm.targetElement;
611
      storm.targetElement = document.getElementById(targetID);
612
      if (!storm.targetElement) {
613
        throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
614
      }
615
    }
616
    if (!storm.targetElement) {
617
      storm.targetElement = (document.body || document.documentElement);
618
    }
619
    if (storm.targetElement !== document.documentElement && storm.targetElement !== document.body) {
620
      // re-map handler to get element instead of screen dimensions
621
      storm.resizeHandler = storm.resizeHandlerAlt;
622
      //and force-enable pixel positioning
623
      storm.usePixelPosition = true;
624
    }
625
    storm.resizeHandler(); // get bounding box elements
626
    storm.usePositionFixed = (storm.usePositionFixed && !noFixed && !storm.flakeBottom); // whether or not position:fixed is to be used
627
    if (window.getComputedStyle) {
628
      // attempt to determine if body or user-specified snow parent element is relatlively-positioned.
629
      try {
630
        targetElementIsRelative = (window.getComputedStyle(storm.targetElement, null).getPropertyValue('position') === 'relative');
631
      } catch(e) {
632
        // oh well
633
        targetElementIsRelative = false;
634
      }
635
    }
636
    fixedForEverything = storm.usePositionFixed;
637
    if (screenX && screenY && !storm.disabled) {
638
      storm.init();
639
      storm.active = true;
640
    }
641
  };
642
643
  function doDelayedStart() {
644
    window.setTimeout(function() {
645
      storm.start(true);
646
    }, 20);
647
    // event cleanup
648
    storm.events.remove(isIE?document:window,'mousemove',doDelayedStart);
649
  }
650
651
  function doStart() {
652
    if (!storm.excludeMobile || !isMobile) {
653
      doDelayedStart();
654
    }
655
    // event cleanup
656
    storm.events.remove(window, 'load', doStart);
657
  }
658
659
  // hooks for starting the snow
660
  if (storm.autoStart) {
661
    storm.events.add(window, 'load', doStart, false);
662
  }
663
664
  return this;
665
666
}(window, document));