feat: snow

src/layouts/Layout.astro

@@ -48,6 +48,7 @@
         <div class='fireworks-container h-full w-full absolute top-0 left-0 z-[-1000]' />
         <script>
             import "../scripts/menu.js";
+            import "../scripts/snow.js";
 
             import { Fireworks } from 'fireworks-js';
 

src/scripts/snow.js

@@ -0,0 +1,668 @@
+/** @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 */
+
+class SnowStorm {
+    constructor() {
+    // --- 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 = 50;    // 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 = false;        // 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;
+    }
+}
+
+new SnowStorm();