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/** @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 = '•'; // • = 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 // --- 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.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 oFunc = args.shift()[evt[sType]]; if (old) { oFunc(args[0], args[1]); } else { oFunc.apply(this, 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 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 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 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 windOffset = -windMultiplier+(x/screenX2*windMultiplier); } else { x -= screenX2; windOffset = (x/screenX2)*windMultiplier; } }; this.createSnow = function(limit,allowInactive) { for (var i=0; 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.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 doStart() { if ((this.excludeMobile && !isMobile) || !this.excludeMobile) { window.setTimeout(function() { s.start(true); }, 20); } // event cleanup s.events.remove(window, 'load', doStart); } // hooks for starting the snow s.events.add(window, 'load', doStart, false); return this;