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Revision as of 14:38, 15 December 2020

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/* All JavaScript here will be loaded for users of the Vector skin */
 +
/** @license
 +
* DHTML Snowstorm! JavaScript-based snow for web pages
 +
* Making it snow on the internets since 2003. You're welcome.
 +
* -----------------------------------------------------------
 +
* Version 1.44.20131208 (Previous rev: 1.44.20131125)
 +
* Copyright (c) 2007, Scott Schiller. All rights reserved.
 +
* Code provided under the BSD License
 +
* http://schillmania.com/projects/snowstorm/license.txt
 +
*/
    +
/*jslint nomen: true, plusplus: true, sloppy: true, vars: true, white: true */
 +
/*global window, document, navigator, clearInterval, setInterval */
 +
 +
var snowStorm = (function(window, document) {
 +
 +
  // --- common properties ---
 +
 +
  this.autoStart = true;          // Whether the snow should start automatically or not.
 +
  this.excludeMobile = true;      // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) Enable at your own risk.
 +
  this.flakesMax = 128;          // Limit total amount of snow made (falling + sticking)
 +
  this.flakesMaxActive = 64;      // Limit amount of snow falling at once (less = lower CPU use)
 +
  this.animationInterval = 33;    // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
 +
  this.useGPU = true;            // Enable transform-based hardware acceleration, reduce CPU load.
 +
  this.className = null;          // CSS class name for further customization on snow elements
 +
  this.excludeMobile = true;      // Snow is likely to be bad news for mobile phones' CPUs (and batteries.) By default, be nice.
 +
  this.flakeBottom = null;        // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
 +
  this.followMouse = true;        // Snow movement can respond to the user's mouse
 +
  this.snowColor = '#fff';        // Don't eat (or use?) yellow snow.
 +
  this.snowCharacter = '•';  // • = bullet, · is square on some systems etc.
 +
  this.snowStick = true;          // Whether or not snow should "stick" at the bottom. When off, will never collect.
 +
  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
 +
  this.useMeltEffect = true;      // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
 +
  this.useTwinkleEffect = false;  // Allow snow to randomly "flicker" in and out of view while falling
 +
  this.usePositionFixed = false;  // true = snow does not shift vertically when scrolling. May increase CPU load, disabled by default - if enabled, used only where supported
 +
  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.
 +
 +
  // --- less-used bits ---
 +
 +
  this.freezeOnBlur = true;      // Only snow when the window is in focus (foreground.) Saves CPU.
 +
  this.flakeLeftOffset = 0;      // Left margin/gutter space on edge of container (eg. browser window.) Bump up these values if seeing horizontal scrollbars.
 +
  this.flakeRightOffset = 0;      // Right margin/gutter space on edge of container
 +
  this.flakeWidth = 8;            // Max pixel width reserved for snow element
 +
  this.flakeHeight = 8;          // Max pixel height reserved for snow element
 +
  this.vMaxX = 5;                // Maximum X velocity range for snow
 +
  this.vMaxY = 4;                // Maximum Y velocity range for snow
 +
  this.zIndex = 0;                // CSS stacking order applied to each snowflake
 +
 +
  // --- "No user-serviceable parts inside" past this point, yadda yadda ---
 +
 +
  var storm = this,
 +
  features,
 +
  // UA sniffing and backCompat rendering mode checks for fixed position, etc.
 +
  isIE = navigator.userAgent.match(/msie/i),
 +
  isIE6 = navigator.userAgent.match(/msie 6/i),
 +
  isMobile = navigator.userAgent.match(/mobile|opera m(ob|in)/i),
 +
  isBackCompatIE = (isIE && document.compatMode === 'BackCompat'),
 +
  noFixed = (isBackCompatIE || isIE6),
 +
  screenX = null, screenX2 = null, screenY = null, scrollY = null, docHeight = null, vRndX = null, vRndY = null,
 +
  windOffset = 1,
 +
  windMultiplier = 2,
 +
  flakeTypes = 6,
 +
  fixedForEverything = false,
 +
  targetElementIsRelative = false,
 +
  opacitySupported = (function(){
 +
    try {
 +
      document.createElement('div').style.opacity = '0.5';
 +
    } catch(e) {
 +
      return false;
 +
    }
 +
    return true;
 +
  }()),
 +
  didInit = false,
 +
  docFrag = document.createDocumentFragment();
 +
 +
  features = (function() {
 +
 +
    var getAnimationFrame;
 +
 +
    /**
 +
    * hat tip: paul irish
 +
    * http://paulirish.com/2011/requestanimationframe-for-smart-animating/
 +
    * https://gist.github.com/838785
 +
    */
 +
 +
    function timeoutShim(callback) {
 +
      window.setTimeout(callback, 1000/(storm.animationInterval || 20));
 +
    }
 +
 +
    var _animationFrame = (window.requestAnimationFrame ||
 +
        window.webkitRequestAnimationFrame ||
 +
        window.mozRequestAnimationFrame ||
 +
        window.oRequestAnimationFrame ||
 +
        window.msRequestAnimationFrame ||
 +
        timeoutShim);
 +
 +
    // apply to window, avoid "illegal invocation" errors in Chrome
 +
    getAnimationFrame = _animationFrame ? function() {
 +
      return _animationFrame.apply(window, arguments);
 +
    } : null;
 +
 +
    var testDiv;
 +
 +
    testDiv = document.createElement('div');
 +
 +
    function has(prop) {
 +
 +
      // test for feature support
 +
      var result = testDiv.style[prop];
 +
      return (result !== undefined ? prop : null);
 +
 +
    }
 +
 +
    // note local scope.
 +
    var localFeatures = {
 +
 +
      transform: {
 +
        ie:  has('-ms-transform'),
 +
        moz: has('MozTransform'),
 +
        opera: has('OTransform'),
 +
        webkit: has('webkitTransform'),
 +
        w3: has('transform'),
 +
        prop: null // the normalized property value
 +
      },
 +
 +
      getAnimationFrame: getAnimationFrame
 +
 +
    };
 +
 +
    localFeatures.transform.prop = (
 +
      localFeatures.transform.w3 ||
 +
      localFeatures.transform.moz ||
 +
      localFeatures.transform.webkit ||
 +
      localFeatures.transform.ie ||
 +
      localFeatures.transform.opera
 +
    );
 +
 +
    testDiv = null;
 +
 +
    return localFeatures;
 +
 +
  }());
 +
 +
  this.timer = null;
 +
  this.flakes = [];
 +
  this.disabled = false;
 +
  this.active = false;
 +
  this.meltFrameCount = 20;
 +
  this.meltFrames = [];
 +
 +
  this.setXY = function(o, x, y) {
 +
 +
    if (!o) {
 +
      return false;
 +
    }
 +
 +
    if (storm.usePixelPosition || targetElementIsRelative) {
 +
 +
      o.style.left = (x - storm.flakeWidth) + 'px';
 +
      o.style.top = (y - storm.flakeHeight) + 'px';
 +
 +
    } else if (noFixed) {
 +
 +
      o.style.right = (100-(x/screenX*100)) + '%';
 +
      // avoid creating vertical scrollbars
 +
      o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px';
 +
 +
    } else {
 +
 +
      if (!storm.flakeBottom) {
 +
 +
        // if not using a fixed bottom coordinate...
 +
        o.style.right = (100-(x/screenX*100)) + '%';
 +
        o.style.bottom = (100-(y/screenY*100)) + '%';
 +
 +
      } else {
 +
 +
        // absolute top.
 +
        o.style.right = (100-(x/screenX*100)) + '%';
 +
        o.style.top = (Math.min(y, docHeight-storm.flakeHeight)) + 'px';
 +
 +
      }
 +
 +
    }
 +
 +
  };
 +
 +
  this.events = (function() {
 +
 +
    var old = (!window.addEventListener && window.attachEvent), slice = Array.prototype.slice,
 +
    evt = {
 +
      add: (old?'attachEvent':'addEventListener'),
 +
      remove: (old?'detachEvent':'removeEventListener')
 +
    };
 +
 +
    function getArgs(oArgs) {
 +
      var args = slice.call(oArgs), len = args.length;
 +
      if (old) {
 +
        args[1] = 'on' + args[1]; // prefix
 +
        if (len > 3) {
 +
          args.pop(); // no capture
 +
        }
 +
      } else if (len === 3) {
 +
        args.push(false);
 +
      }
 +
      return args;
 +
    }
 +
 +
    function apply(args, sType) {
 +
      var element = args.shift(),
 +
          method = [evt[sType]];
 +
      if (old) {
 +
        element[method](args[0], args[1]);
 +
      } else {
 +
        element[method].apply(element, args);
 +
      }
 +
    }
 +
 +
    function addEvent() {
 +
      apply(getArgs(arguments), 'add');
 +
    }
 +
 +
    function removeEvent() {
 +
      apply(getArgs(arguments), 'remove');
 +
    }
 +
 +
    return {
 +
      add: addEvent,
 +
      remove: removeEvent
 +
    };
 +
 +
  }());
 +
 +
  function rnd(n,min) {
 +
    if (isNaN(min)) {
 +
      min = 0;
 +
    }
 +
    return (Math.random()*n)+min;
 +
  }
 +
 +
  function plusMinus(n) {
 +
    return (parseInt(rnd(2),10)===1?n*-1:n);
 +
  }
 +
 +
  this.randomizeWind = function() {
 +
    var i;
 +
    vRndX = plusMinus(rnd(storm.vMaxX,0.2));
 +
    vRndY = rnd(storm.vMaxY,0.2);
 +
    if (this.flakes) {
 +
      for (i=0; i<this.flakes.length; i++) {
 +
        if (this.flakes[i].active) {
 +
          this.flakes[i].setVelocities();
 +
        }
 +
      }
 +
    }
 +
  };
 +
 +
  this.scrollHandler = function() {
 +
    var i;
 +
    // "attach" snowflakes to bottom of window if no absolute bottom value was given
 +
    scrollY = (storm.flakeBottom ? 0 : parseInt(window.scrollY || document.documentElement.scrollTop || (noFixed ? document.body.scrollTop : 0), 10));
 +
    if (isNaN(scrollY)) {
 +
      scrollY = 0; // Netscape 6 scroll fix
 +
    }
 +
    if (!fixedForEverything && !storm.flakeBottom && storm.flakes) {
 +
      for (i=0; i<storm.flakes.length; i++) {
 +
        if (storm.flakes[i].active === 0) {
 +
          storm.flakes[i].stick();
 +
        }
 +
      }
 +
    }
 +
  };
 +
 +
  this.resizeHandler = function() {
 +
    if (window.innerWidth || window.innerHeight) {
 +
      screenX = window.innerWidth - 16 - storm.flakeRightOffset;
 +
      screenY = (storm.flakeBottom || window.innerHeight);
 +
    } else {
 +
      screenX = (document.documentElement.clientWidth || document.body.clientWidth || document.body.scrollWidth) - (!isIE ? 8 : 0) - storm.flakeRightOffset;
 +
      screenY = storm.flakeBottom || document.documentElement.clientHeight || document.body.clientHeight || document.body.scrollHeight;
 +
    }
 +
    docHeight = document.body.offsetHeight;
 +
    screenX2 = parseInt(screenX/2,10);
 +
  };
 +
 +
  this.resizeHandlerAlt = function() {
 +
    screenX = storm.targetElement.offsetWidth - storm.flakeRightOffset;
 +
    screenY = storm.flakeBottom || storm.targetElement.offsetHeight;
 +
    screenX2 = parseInt(screenX/2,10);
 +
    docHeight = document.body.offsetHeight;
 +
  };
 +
 +
  this.freeze = function() {
 +
    // pause animation
 +
    if (!storm.disabled) {
 +
      storm.disabled = 1;
 +
    } else {
 +
      return false;
 +
    }
 +
    storm.timer = null;
 +
  };
 +
 +
  this.resume = function() {
 +
    if (storm.disabled) {
 +
      storm.disabled = 0;
 +
    } else {
 +
      return false;
 +
    }
 +
    storm.timerInit();
 +
  };
 +
 +
  this.toggleSnow = function() {
 +
    if (!storm.flakes.length) {
 +
      // first run
 +
      storm.start();
 +
    } else {
 +
      storm.active = !storm.active;
 +
      if (storm.active) {
 +
        storm.show();
 +
        storm.resume();
 +
      } else {
 +
        storm.stop();
 +
        storm.freeze();
 +
      }
 +
    }
 +
  };
 +
 +
  this.stop = function() {
 +
    var i;
 +
    this.freeze();
 +
    for (i=0; i<this.flakes.length; i++) {
 +
      this.flakes[i].o.style.display = 'none';
 +
    }
 +
    storm.events.remove(window,'scroll',storm.scrollHandler);
 +
    storm.events.remove(window,'resize',storm.resizeHandler);
 +
    if (storm.freezeOnBlur) {
 +
      if (isIE) {
 +
        storm.events.remove(document,'focusout',storm.freeze);
 +
        storm.events.remove(document,'focusin',storm.resume);
 +
      } else {
 +
        storm.events.remove(window,'blur',storm.freeze);
 +
        storm.events.remove(window,'focus',storm.resume);
 +
      }
 +
    }
 +
  };
 +
 +
  this.show = function() {
 +
    var i;
 +
    for (i=0; i<this.flakes.length; i++) {
 +
      this.flakes[i].o.style.display = 'block';
 +
    }
 +
  };
 +
 +
  this.SnowFlake = function(type,x,y) {
 +
    var s = this;
 +
    this.type = type;
 +
    this.x = x||parseInt(rnd(screenX-20),10);
 +
    this.y = (!isNaN(y)?y:-rnd(screenY)-12);
 +
    this.vX = null;
 +
    this.vY = null;
 +
    this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
 +
    this.vAmp = this.vAmpTypes[this.type] || 1;
 +
    this.melting = false;
 +
    this.meltFrameCount = storm.meltFrameCount;
 +
    this.meltFrames = storm.meltFrames;
 +
    this.meltFrame = 0;
 +
    this.twinkleFrame = 0;
 +
    this.active = 1;
 +
    this.fontSize = (10+(this.type/5)*10);
 +
    this.o = document.createElement('div');
 +
    this.o.innerHTML = storm.snowCharacter;
 +
    if (storm.className) {
 +
      this.o.setAttribute('class', storm.className);
 +
    }
 +
    this.o.style.color = storm.snowColor;
 +
    this.o.style.position = (fixedForEverything?'fixed':'absolute');
 +
    if (storm.useGPU && features.transform.prop) {
 +
      // GPU-accelerated snow.
 +
      this.o.style[features.transform.prop] = 'translate3d(0px, 0px, 0px)';
 +
    }
 +
    this.o.style.width = storm.flakeWidth+'px';
 +
    this.o.style.height = storm.flakeHeight+'px';
 +
    this.o.style.fontFamily = 'arial,verdana';
 +
    this.o.style.cursor = 'default';
 +
    this.o.style.overflow = 'hidden';
 +
    this.o.style.fontWeight = 'normal';
 +
    this.o.style.zIndex = storm.zIndex;
 +
    docFrag.appendChild(this.o);
 +
 +
    this.refresh = function() {
 +
      if (isNaN(s.x) || isNaN(s.y)) {
 +
        // safety check
 +
        return false;
 +
      }
 +
      storm.setXY(s.o, s.x, s.y);
 +
    };
 +
 +
    this.stick = function() {
 +
      if (noFixed || (storm.targetElement !== document.documentElement && storm.targetElement !== document.body)) {
 +
        s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
 +
      } else if (storm.flakeBottom) {
 +
        s.o.style.top = storm.flakeBottom+'px';
 +
      } else {
 +
        s.o.style.display = 'none';
 +
        s.o.style.bottom = '0%';
 +
        s.o.style.position = 'fixed';
 +
        s.o.style.display = 'block';
 +
      }
 +
    };
 +
 +
    this.vCheck = function() {
 +
      if (s.vX>=0 && s.vX<0.2) {
 +
        s.vX = 0.2;
 +
      } else if (s.vX<0 && s.vX>-0.2) {
 +
        s.vX = -0.2;
 +
      }
 +
      if (s.vY>=0 && s.vY<0.2) {
 +
        s.vY = 0.2;
 +
      }
 +
    };
 +
 +
    this.move = function() {
 +
      var vX = s.vX*windOffset, yDiff;
 +
      s.x += vX;
 +
      s.y += (s.vY*s.vAmp);
 +
      if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
 +
        s.x = 0;
 +
      } else if (vX < 0 && s.x-storm.flakeLeftOffset < -storm.flakeWidth) {
 +
        s.x = screenX-storm.flakeWidth-1; // flakeWidth;
 +
      }
 +
      s.refresh();
 +
      yDiff = screenY+scrollY-s.y+storm.flakeHeight;
 +
      if (yDiff<storm.flakeHeight) {
 +
        s.active = 0;
 +
        if (storm.snowStick) {
 +
          s.stick();
 +
        } else {
 +
          s.recycle();
 +
        }
 +
      } else {
 +
        if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
 +
          // ~1/1000 chance of melting mid-air, with each frame
 +
          s.melting = true;
 +
          s.melt();
 +
          // only incrementally melt one frame
 +
          // s.melting = false;
 +
        }
 +
        if (storm.useTwinkleEffect) {
 +
          if (s.twinkleFrame < 0) {
 +
            if (Math.random() > 0.97) {
 +
              s.twinkleFrame = parseInt(Math.random() * 8, 10);
 +
            }
 +
          } else {
 +
            s.twinkleFrame--;
 +
            if (!opacitySupported) {
 +
              s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 'hidden' : 'visible');
 +
            } else {
 +
              s.o.style.opacity = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 0 : 1);
 +
            }
 +
          }
 +
        }
 +
      }
 +
    };
 +
 +
    this.animate = function() {
 +
      // main animation loop
 +
      // move, check status, die etc.
 +
      s.move();
 +
    };
 +
 +
    this.setVelocities = function() {
 +
      s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
 +
      s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
 +
    };
 +
 +
    this.setOpacity = function(o,opacity) {
 +
      if (!opacitySupported) {
 +
        return false;
 +
      }
 +
      o.style.opacity = opacity;
 +
    };
 +
 +
    this.melt = function() {
 +
      if (!storm.useMeltEffect || !s.melting) {
 +
        s.recycle();
 +
      } else {
 +
        if (s.meltFrame < s.meltFrameCount) {
 +
          s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
 +
          s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
 +
          s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
 +
          s.meltFrame++;
 +
        } else {
 +
          s.recycle();
 +
        }
 +
      }
 +
    };
 +
 +
    this.recycle = function() {
 +
      s.o.style.display = 'none';
 +
      s.o.style.position = (fixedForEverything?'fixed':'absolute');
 +
      s.o.style.bottom = 'auto';
 +
      s.setVelocities();
 +
      s.vCheck();
 +
      s.meltFrame = 0;
 +
      s.melting = false;
 +
      s.setOpacity(s.o,1);
 +
      s.o.style.padding = '0px';
 +
      s.o.style.margin = '0px';
 +
      s.o.style.fontSize = s.fontSize+'px';
 +
      s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
 +
      s.o.style.textAlign = 'center';
 +
      s.o.style.verticalAlign = 'baseline';
 +
      s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
 +
      s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
 +
      s.refresh();
 +
      s.o.style.display = 'block';
 +
      s.active = 1;
 +
    };
 +
 +
    this.recycle(); // set up x/y coords etc.
 +
    this.refresh();
 +
 +
  };
 +
 +
  this.snow = function() {
 +
    var active = 0, flake = null, i, j;
 +
    for (i=0, j=storm.flakes.length; i<j; i++) {
 +
      if (storm.flakes[i].active === 1) {
 +
        storm.flakes[i].move();
 +
        active++;
 +
      }
 +
      if (storm.flakes[i].melting) {
 +
        storm.flakes[i].melt();
 +
      }
 +
    }
 +
    if (active<storm.flakesMaxActive) {
 +
      flake = storm.flakes[parseInt(rnd(storm.flakes.length),10)];
 +
      if (flake.active === 0) {
 +
        flake.melting = true;
 +
      }
 +
    }
 +
    if (storm.timer) {
 +
      features.getAnimationFrame(storm.snow);
 +
    }
 +
  };
 +
 +
  this.mouseMove = function(e) {
 +
    if (!storm.followMouse) {
 +
      return true;
 +
    }
 +
    var x = parseInt(e.clientX,10);
 +
    if (x<screenX2) {
 +
      windOffset = -windMultiplier+(x/screenX2*windMultiplier);
 +
    } else {
 +
      x -= screenX2;
 +
      windOffset = (x/screenX2)*windMultiplier;
 +
    }
 +
  };
 +
 +
  this.createSnow = function(limit,allowInactive) {
 +
    var i;
 +
    for (i=0; i<limit; i++) {
 +
      storm.flakes[storm.flakes.length] = new storm.SnowFlake(parseInt(rnd(flakeTypes),10));
 +
      if (allowInactive || i>storm.flakesMaxActive) {
 +
        storm.flakes[storm.flakes.length-1].active = -1;
 +
      }
 +
    }
 +
    storm.targetElement.appendChild(docFrag);
 +
  };
 +
 +
  this.timerInit = function() {
 +
    storm.timer = true;
 +
    storm.snow();
 +
  };
 +
 +
  this.init = function() {
 +
    var i;
 +
    for (i=0; i<storm.meltFrameCount; i++) {
 +
      storm.meltFrames.push(1-(i/storm.meltFrameCount));
 +
    }
 +
    storm.randomizeWind();
 +
    storm.createSnow(storm.flakesMax); // create initial batch
 +
    storm.events.add(window,'resize',storm.resizeHandler);
 +
    storm.events.add(window,'scroll',storm.scrollHandler);
 +
    if (storm.freezeOnBlur) {
 +
      if (isIE) {
 +
        storm.events.add(document,'focusout',storm.freeze);
 +
        storm.events.add(document,'focusin',storm.resume);
 +
      } else {
 +
        storm.events.add(window,'blur',storm.freeze);
 +
        storm.events.add(window,'focus',storm.resume);
 +
      }
 +
    }
 +
    storm.resizeHandler();
 +
    storm.scrollHandler();
 +
    if (storm.followMouse) {
 +
      storm.events.add(isIE?document:window,'mousemove',storm.mouseMove);
 +
    }
 +
    storm.animationInterval = Math.max(20,storm.animationInterval);
 +
    storm.timerInit();
 +
  };
 +
 +
  this.start = function(bFromOnLoad) {
 +
    if (!didInit) {
 +
      didInit = true;
 +
    } else if (bFromOnLoad) {
 +
      // already loaded and running
 +
      return true;
 +
    }
 +
    if (typeof storm.targetElement === 'string') {
 +
      var targetID = storm.targetElement;
 +
      storm.targetElement = document.getElementById(targetID);
 +
      if (!storm.targetElement) {
 +
        throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
 +
      }
 +
    }
 +
    if (!storm.targetElement) {
 +
      storm.targetElement = (document.body || document.documentElement);
 +
    }
 +
    if (storm.targetElement !== document.documentElement && storm.targetElement !== document.body) {
 +
      // re-map handler to get element instead of screen dimensions
 +
      storm.resizeHandler = storm.resizeHandlerAlt;
 +
      //and force-enable pixel positioning
 +
      storm.usePixelPosition = true;
 +
    }
 +
    storm.resizeHandler(); // get bounding box elements
 +
    storm.usePositionFixed = (storm.usePositionFixed && !noFixed && !storm.flakeBottom); // whether or not position:fixed is to be used
 +
    if (window.getComputedStyle) {
 +
      // attempt to determine if body or user-specified snow parent element is relatlively-positioned.
 +
      try {
 +
        targetElementIsRelative = (window.getComputedStyle(storm.targetElement, null).getPropertyValue('position') === 'relative');
 +
      } catch(e) {
 +
        // oh well
 +
        targetElementIsRelative = false;
 +
      }
 +
    }
 +
    fixedForEverything = storm.usePositionFixed;
 +
    if (screenX && screenY && !storm.disabled) {
 +
      storm.init();
 +
      storm.active = true;
 +
    }
 +
  };
 +
 +
  function doDelayedStart() {
 +
    window.setTimeout(function() {
 +
      storm.start(true);
 +
    }, 20);
 +
    // event cleanup
 +
    storm.events.remove(isIE?document:window,'mousemove',doDelayedStart);
 +
  }
 +
 +
  function doStart() {
 +
    if (!storm.excludeMobile || !isMobile) {
 +
      doDelayedStart();
 +
    }
 +
    // event cleanup
 +
    storm.events.remove(window, 'load', doStart);
 +
  }
 +
 +
  // hooks for starting the snow
 +
  if (storm.autoStart) {
 +
    storm.events.add(window, 'load', doStart, false);
 +
  }
 +
 +
  return this;
 +
 +
}(window, document));
Retrieved from "https://drawntolife.wiki/en/Special:MobileDiff/5325"