Benjamin Southall
7 years ago
1 changed files with 668 additions and 0 deletions
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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 1.44.20131215 (Previous rev: 1.44.20131208) |
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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 = '#fff'; // Don't eat (or use?) yellow snow.
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this.snowCharacter = '<img src="/favicon.png" height="16px" width="16px">'; // • = bullet, · is square on some systems etc.
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//this.snowCharacter = '❄'; // • = 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 = 16; // Max pixel width reserved for snow element
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this.flakeHeight = 16; // 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 { |
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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, |
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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
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if (len > 3) { |
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args.pop(); // no capture
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} |
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} else if (len === 3) { |
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args.push(false); |
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} |
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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'); |
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} |
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function removeEvent() { |
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apply(getArgs(arguments), 'remove'); |
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} |
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return { |
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add: addEvent, |
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remove: removeEvent |
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}; |
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}()); |
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function rnd(n,min) { |
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if (isNaN(min)) { |
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min = 0; |
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} |
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return (Math.random()*n)+min; |
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} |
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function plusMinus(n) { |
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return (parseInt(rnd(2),10)===1?n*-1:n); |
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} |
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this.randomizeWind = function() { |
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var i; |
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vRndX = plusMinus(rnd(storm.vMaxX,0.2)); |
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vRndY = rnd(storm.vMaxY,0.2); |
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if (this.flakes) { |
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for (i=0; i<this.flakes.length; i++) { |
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if (this.flakes[i].active) { |
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this.flakes[i].setVelocities(); |
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} |
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} |
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} |
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}; |
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this.scrollHandler = function() { |
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var i; |
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// "attach" snowflakes to bottom of window if no absolute bottom value was given
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scrollY = (storm.flakeBottom ? 0 : parseInt(window.scrollY || document.documentElement.scrollTop || (noFixed ? document.body.scrollTop : 0), 10)); |
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if (isNaN(scrollY)) { |
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scrollY = 0; // Netscape 6 scroll fix
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} |
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if (!fixedForEverything && !storm.flakeBottom && storm.flakes) { |
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for (i=0; i<storm.flakes.length; i++) { |
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if (storm.flakes[i].active === 0) { |
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storm.flakes[i].stick(); |
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} |
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} |
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} |
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}; |
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this.resizeHandler = function() { |
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if (window.innerWidth || window.innerHeight) { |
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screenX = window.innerWidth - 16 - storm.flakeRightOffset; |
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screenY = (storm.flakeBottom || window.innerHeight); |
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} else { |
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screenX = (document.documentElement.clientWidth || document.body.clientWidth || document.body.scrollWidth) - (!isIE ? 8 : 0) - storm.flakeRightOffset; |
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screenY = storm.flakeBottom || document.documentElement.clientHeight || document.body.clientHeight || document.body.scrollHeight; |
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} |
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docHeight = document.body.offsetHeight; |
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screenX2 = parseInt(screenX/2,10); |
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}; |
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this.resizeHandlerAlt = function() { |
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screenX = storm.targetElement.offsetWidth - storm.flakeRightOffset; |
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screenY = storm.flakeBottom || storm.targetElement.offsetHeight; |
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screenX2 = parseInt(screenX/2,10); |
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docHeight = document.body.offsetHeight; |
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}; |
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this.freeze = function() { |
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// pause animation
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if (!storm.disabled) { |
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storm.disabled = 1; |
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} else { |
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return false; |
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} |
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storm.timer = null; |
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}; |
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this.resume = function() { |
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if (storm.disabled) { |
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storm.disabled = 0; |
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} else { |
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return false; |
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} |
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storm.timerInit(); |
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}; |
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this.toggleSnow = function() { |
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if (!storm.flakes.length) { |
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// first run
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storm.start(); |
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} else { |
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storm.active = !storm.active; |
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if (storm.active) { |
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storm.show(); |
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storm.resume(); |
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} else { |
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storm.stop(); |
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storm.freeze(); |
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} |
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} |
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}; |
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this.stop = function() { |
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var i; |
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this.freeze(); |
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for (i=0; i<this.flakes.length; i++) { |
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this.flakes[i].o.style.display = 'none'; |
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} |
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storm.events.remove(window,'scroll',storm.scrollHandler); |
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storm.events.remove(window,'resize',storm.resizeHandler); |
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if (storm.freezeOnBlur) { |
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if (isIE) { |
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storm.events.remove(document,'focusout',storm.freeze); |
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storm.events.remove(document,'focusin',storm.resume); |
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} else { |
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storm.events.remove(window,'blur',storm.freeze); |
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storm.events.remove(window,'focus',storm.resume); |
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} |
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} |
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}; |
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this.show = function() { |
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var i; |
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for (i=0; i<this.flakes.length; i++) { |
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this.flakes[i].o.style.display = 'block'; |
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} |
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}; |
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this.SnowFlake = function(type,x,y) { |
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var s = this; |
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this.type = type; |
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this.x = x||parseInt(rnd(screenX-20),10); |
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this.y = (!isNaN(y)?y:-rnd(screenY)-12); |
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this.vX = null; |
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this.vY = null; |
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this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
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this.vAmp = this.vAmpTypes[this.type] || 1; |
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this.melting = false; |
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this.meltFrameCount = storm.meltFrameCount; |
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this.meltFrames = storm.meltFrames; |
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this.meltFrame = 0; |
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this.twinkleFrame = 0; |
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this.active = 1; |
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this.fontSize = (10+(this.type/5)*10); |
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this.o = document.createElement('div'); |
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this.o.innerHTML = storm.snowCharacter; |
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if (storm.className) { |
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this.o.setAttribute('class', storm.className); |
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} |
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this.o.style.color = storm.snowColor; |
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this.o.style.position = (fixedForEverything?'fixed':'absolute'); |
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if (storm.useGPU && features.transform.prop) { |
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// GPU-accelerated snow.
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this.o.style[features.transform.prop] = 'translate3d(0px, 0px, 0px)'; |
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} |
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this.o.style.width = storm.flakeWidth+'px'; |
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this.o.style.height = storm.flakeHeight+'px'; |
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this.o.style.fontFamily = 'arial,verdana'; |
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this.o.style.cursor = 'default'; |
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this.o.style.overflow = 'hidden'; |
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this.o.style.fontWeight = 'normal'; |
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this.o.style.zIndex = storm.zIndex; |
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docFrag.appendChild(this.o); |
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this.refresh = function() { |
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if (isNaN(s.x) || isNaN(s.y)) { |
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// safety check
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return false; |
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} |
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storm.setXY(s.o, s.x, s.y); |
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}; |
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this.stick = function() { |
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if (noFixed || (storm.targetElement !== document.documentElement && storm.targetElement !== document.body)) { |
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s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px'; |
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} else if (storm.flakeBottom) { |
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s.o.style.top = storm.flakeBottom+'px'; |
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} else { |
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s.o.style.display = 'none'; |
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s.o.style.top = 'auto'; |
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s.o.style.bottom = '0%'; |
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s.o.style.position = 'fixed'; |
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s.o.style.display = 'block'; |
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} |
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}; |
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this.vCheck = function() { |
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if (s.vX>=0 && s.vX<0.2) { |
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s.vX = 0.2; |
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} else if (s.vX<0 && s.vX>-0.2) { |
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s.vX = -0.2; |
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} |
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if (s.vY>=0 && s.vY<0.2) { |
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s.vY = 0.2; |
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} |
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}; |
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this.move = function() { |
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var vX = s.vX*windOffset, yDiff; |
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s.x += vX; |
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s.y += (s.vY*s.vAmp); |
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if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
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s.x = 0; |
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} else if (vX < 0 && s.x-storm.flakeLeftOffset < -storm.flakeWidth) { |
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s.x = screenX-storm.flakeWidth-1; // flakeWidth;
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} |
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s.refresh(); |
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yDiff = screenY+scrollY-s.y+storm.flakeHeight; |
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if (yDiff<storm.flakeHeight) { |
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s.active = 0; |
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if (storm.snowStick) { |
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s.stick(); |
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} else { |
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s.recycle(); |
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} |
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} else { |
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if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) { |
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// ~1/1000 chance of melting mid-air, with each frame
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s.melting = true; |
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s.melt(); |
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// only incrementally melt one frame
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// s.melting = false;
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} |
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if (storm.useTwinkleEffect) { |
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if (s.twinkleFrame < 0) { |
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if (Math.random() > 0.97) { |
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s.twinkleFrame = parseInt(Math.random() * 8, 10); |
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} |
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} else { |
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s.twinkleFrame--; |
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if (!opacitySupported) { |
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s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 'hidden' : 'visible'); |
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} else { |
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s.o.style.opacity = (s.twinkleFrame && s.twinkleFrame % 2 === 0 ? 0 : 1); |
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} |
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} |
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} |
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} |
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}; |
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this.animate = function() { |
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// main animation loop
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// move, check status, die etc.
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s.move(); |
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}; |
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this.setVelocities = function() { |
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s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1); |
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s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1); |
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}; |
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this.setOpacity = function(o,opacity) { |
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if (!opacitySupported) { |
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return false; |
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} |
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o.style.opacity = opacity; |
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}; |
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this.melt = function() { |
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if (!storm.useMeltEffect || !s.melting) { |
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s.recycle(); |
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} else { |
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if (s.meltFrame < s.meltFrameCount) { |
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s.setOpacity(s.o,s.meltFrames[s.meltFrame]); |
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s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px'; |
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s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px'; |
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s.meltFrame++; |
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} else { |
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s.recycle(); |
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} |
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} |
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}; |
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this.recycle = function() { |
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s.o.style.display = 'none'; |
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s.o.style.position = (fixedForEverything?'fixed':'absolute'); |
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s.o.style.bottom = 'auto'; |
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s.setVelocities(); |
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s.vCheck(); |
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s.meltFrame = 0; |
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s.melting = false; |
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s.setOpacity(s.o,1); |
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s.o.style.padding = '0px'; |
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s.o.style.margin = '0px'; |
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s.o.style.fontSize = s.fontSize+'px'; |
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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)); |
Loading…
Reference in new issue