From 8e33ff530a223f246da028fd3380f49571a531a7 Mon Sep 17 00:00:00 2001
From: Erik Michaels-Ober <sferik@gmail.com>
Date: Fri, 25 Feb 2011 15:34:39 -0500
Subject: [PATCH] Add snowstorm

---
 app/views/layouts/application.html.erb |   2 +-
 public/javascripts/snowstorm.js        | 528 +++++++++++++++++++++++++
 2 files changed, 529 insertions(+), 1 deletion(-)
 create mode 100644 public/javascripts/snowstorm.js

diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index ce0815f..b82dd90 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -6,7 +6,7 @@
     <%= javascript_include_tag "http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" %>
     <%= javascript_include_tag "http://maps.google.com/maps/api/js?sensor=false" %>
     <%= javascript_include_tag "maps" %>
-    <%= javascript_include_tag "geojson/GeoJSON" %>
+    <%= javascript_include_tag "snowstorm" %>
     <%= csrf_meta_tag %>
     <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
   </head>
diff --git a/public/javascripts/snowstorm.js b/public/javascripts/snowstorm.js
new file mode 100644
index 0000000..8f87407
--- /dev/null
+++ b/public/javascripts/snowstorm.js
@@ -0,0 +1,528 @@
+/** @license
+ * DHTML Snowstorm! JavaScript-based Snow for web pages
+ * --------------------------------------------------------
+ * Version 1.41.20101113 (Previous rev: 1.4.20091115)
+ * Copyright (c) 2007, Scott Schiller. All rights reserved.
+ * Code provided under the BSD License:
+ * http://schillmania.com/projects/snowstorm/license.txt
+ */
+
+/*global window, document, navigator, clearInterval, setInterval */
+/*jslint white: false, onevar: true, plusplus: false, undef: true, nomen: true, eqeqeq: true, bitwise: true, regexp: true, newcap: true, immed: true */
+
+var snowStorm = (function(window, document) {
+
+  // --- common properties ---
+
+  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.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 = '&bull;';  // &bull; = bullet, &middot; 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
+
+  // --- 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
+
+  // --- End of user section ---
+
+  var s = this, storm = this, i,
+  // UA sniffing and backCompat rendering mode checks for fixed position, etc.
+  isIE = navigator.userAgent.match(/msie/i),
+  isIE6 = navigator.userAgent.match(/msie 6/i),
+  isWin98 = navigator.appVersion.match(/windows 98/i),
+  isMobile = navigator.userAgent.match(/mobile/i),
+  isBackCompatIE = (isIE && document.compatMode === 'BackCompat'),
+  noFixed = (isMobile || isBackCompatIE || isIE6),
+  screenX = null, screenX2 = null, screenY = null, scrollY = null, vRndX = null, vRndY = null,
+  windOffset = 1,
+  windMultiplier = 2,
+  flakeTypes = 6,
+  fixedForEverything = false,
+  opacitySupported = (function(){
+    try {
+      document.createElement('div').style.opacity = '0.5';
+    } catch(e) {
+      return false;
+    }
+    return true;
+  }()),
+  didInit = false,
+  docFrag = document.createDocumentFragment();
+
+  this.timers = [];
+  this.flakes = [];
+  this.disabled = false;
+  this.active = false;
+  this.meltFrameCount = 20;
+  this.meltFrames = [];
+
+  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() {
+    vRndX = plusMinus(rnd(s.vMaxX,0.2));
+    vRndY = rnd(s.vMaxY,0.2);
+    if (this.flakes) {
+      for (var i=0; i<this.flakes.length; i++) {
+        if (this.flakes[i].active) {
+          this.flakes[i].setVelocities();
+        }
+      }
+    }
+  };
+
+  this.scrollHandler = function() {
+    // "attach" snowflakes to bottom of window if no absolute bottom value was given
+    scrollY = (s.flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop,10));
+    if (isNaN(scrollY)) {
+      scrollY = 0; // Netscape 6 scroll fix
+    }
+    if (!fixedForEverything && !s.flakeBottom && s.flakes) {
+      for (var i=s.flakes.length; i--;) {
+        if (s.flakes[i].active === 0) {
+          s.flakes[i].stick();
+        }
+      }
+    }
+  };
+
+  this.resizeHandler = function() {
+    if (window.innerWidth || window.innerHeight) {
+      screenX = window.innerWidth-(!isIE?16:2)-s.flakeRightOffset;
+      screenY = (s.flakeBottom?s.flakeBottom:window.innerHeight);
+    } else {
+      screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-s.flakeRightOffset;
+      screenY = s.flakeBottom?s.flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
+    }
+    screenX2 = parseInt(screenX/2,10);
+  };
+
+  this.resizeHandlerAlt = function() {
+    screenX = s.targetElement.offsetLeft+s.targetElement.offsetWidth-s.flakeRightOffset;
+    screenY = s.flakeBottom?s.flakeBottom:s.targetElement.offsetTop+s.targetElement.offsetHeight;
+    screenX2 = parseInt(screenX/2,10);
+  };
+
+  this.freeze = function() {
+    // pause animation
+    if (!s.disabled) {
+      s.disabled = 1;
+    } else {
+      return false;
+    }
+    for (var i=s.timers.length; i--;) {
+      clearInterval(s.timers[i]);
+    }
+  };
+
+  this.resume = function() {
+    if (s.disabled) {
+       s.disabled = 0;
+    } else {
+      return false;
+    }
+    s.timerInit();
+  };
+
+  this.toggleSnow = function() {
+    if (!s.flakes.length) {
+      // first run
+      s.start();
+    } else {
+      s.active = !s.active;
+      if (s.active) {
+        s.show();
+        s.resume();
+      } else {
+        s.stop();
+        s.freeze();
+      }
+    }
+  };
+
+  this.stop = function() {
+    this.freeze();
+    for (var i=this.flakes.length; i--;) {
+      this.flakes[i].o.style.display = 'none';
+    }
+    s.events.remove(window,'scroll',s.scrollHandler);
+    s.events.remove(window,'resize',s.resizeHandler);
+    if (s.freezeOnBlur) {
+      if (isIE) {
+        s.events.remove(document,'focusout',s.freeze);
+        s.events.remove(document,'focusin',s.resume);
+      } else {
+        s.events.remove(window,'blur',s.freeze);
+        s.events.remove(window,'focus',s.resume);
+      }
+    }
+  };
+
+  this.show = function() {
+    for (var i=this.flakes.length; i--;) {
+      this.flakes[i].o.style.display = 'block';
+    }
+  };
+
+  this.SnowFlake = function(parent,type,x,y) {
+    var s = this, storm = parent;
+    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];
+    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;
+    this.o.style.color = storm.snowColor;
+    this.o.style.position = (fixedForEverything?'fixed':'absolute');
+    this.o.style.width = storm.flakeWidth+'px';
+    this.o.style.height = storm.flakeHeight+'px';
+    this.o.style.fontFamily = 'arial,verdana';
+    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;
+      }
+      s.o.style.left = s.x+'px';
+      s.o.style.top = s.y+'px';
+    };
+
+    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.top = 'auto';
+        s.o.style.bottom = '0px';
+        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 < 0-storm.flakeWidth) {
+        s.x = screenX-storm.flakeWidth-1; // flakeWidth;
+      }
+      s.refresh();
+      yDiff = screenY+scrollY-s.y;
+      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) {
+            if (Math.random()>0.9) {
+              s.twinkleFrame = parseInt(Math.random()*20,10);
+            }
+          } else {
+            s.twinkleFrame--;
+            s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame%2===0?'hidden':'visible');
+          }
+        }
+      }
+    };
+
+    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.meltFrame++;
+          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';
+        } 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, used = 0, waiting = 0, flake = null, i;
+    for (i=s.flakes.length; i--;) {
+      if (s.flakes[i].active === 1) {
+        s.flakes[i].move();
+        active++;
+      } else if (s.flakes[i].active === 0) {
+        used++;
+      } else {
+        waiting++;
+      }
+      if (s.flakes[i].melting) {
+        s.flakes[i].melt();
+      }
+    }
+    if (active<s.flakesMaxActive) {
+      flake = s.flakes[parseInt(rnd(s.flakes.length),10)];
+      if (flake.active === 0) {
+        flake.melting = true;
+      }
+    }
+  };
+
+  this.mouseMove = function(e) {
+    if (!s.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) {
+    for (var i=0; i<limit; i++) {
+      s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes),10));
+      if (allowInactive || i>s.flakesMaxActive) {
+        s.flakes[s.flakes.length-1].active = -1;
+      }
+    }
+    storm.targetElement.appendChild(docFrag);
+  };
+
+  this.timerInit = function() {
+    s.timers = (!isWin98?[setInterval(s.snow,s.animationInterval)]:[setInterval(s.snow,s.animationInterval*3),setInterval(s.snow,s.animationInterval)]);
+  };
+
+  this.init = function() {
+    for (var i=0; i<s.meltFrameCount; i++) {
+      s.meltFrames.push(1-(i/s.meltFrameCount));
+    }
+    s.randomizeWind();
+    s.createSnow(s.flakesMax); // create initial batch
+    s.events.add(window,'resize',s.resizeHandler);
+    s.events.add(window,'scroll',s.scrollHandler);
+    if (s.freezeOnBlur) {
+      if (isIE) {
+        s.events.add(document,'focusout',s.freeze);
+        s.events.add(document,'focusin',s.resume);
+      } else {
+        s.events.add(window,'blur',s.freeze);
+        s.events.add(window,'focus',s.resume);
+      }
+    }
+    s.resizeHandler();
+    s.scrollHandler();
+    if (s.followMouse) {
+      s.events.add(isIE?document:window,'mousemove',s.mouseMove);
+    }
+    s.animationInterval = Math.max(20,s.animationInterval);
+    s.timerInit();
+  };
+
+  this.start = function(bFromOnLoad) {
+    if (!didInit) {
+      didInit = true;
+    } else if (bFromOnLoad) {
+      // already loaded and running
+      return true;
+    }
+    if (typeof s.targetElement === 'string') {
+      var targetID = s.targetElement;
+      s.targetElement = document.getElementById(targetID);
+      if (!s.targetElement) {
+        throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
+      }
+    }
+    if (!s.targetElement) {
+      s.targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
+    }
+    if (s.targetElement !== document.documentElement && s.targetElement !== document.body) {
+      s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
+    }
+    s.resizeHandler(); // get bounding box elements
+    s.usePositionFixed = (s.usePositionFixed && !noFixed); // whether or not position:fixed is supported
+    fixedForEverything = s.usePositionFixed;
+    if (screenX && screenY && !s.disabled) {
+      s.init();
+      s.active = true;
+    }
+  };
+
+  function doDelayedStart() {
+    window.setTimeout(function() {
+      s.start(true);
+    }, 20);
+    // event cleanup
+    s.events.remove(isIE?document:window,'mousemove',doDelayedStart);
+  }
+
+  function doStart() {
+    if (!s.excludeMobile || !isMobile) {
+      if (s.freezeOnBlur) {
+        s.events.add(isIE?document:window,'mousemove',doDelayedStart);
+      } else {
+        doDelayedStart();
+      }
+    }
+    // event cleanup
+    s.events.remove(window, 'load', doStart);
+  }
+
+  // hooks for starting the snow
+  s.events.add(window, 'load', doStart, false);
+
+  return this;
+
+}(window, document));
\ No newline at end of file