31 lines
9.7 KiB
JavaScript
31 lines
9.7 KiB
JavaScript
/** @license
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ADAPTED FROM USER BELOW. ONLY THE COLOR WAS CHANGED TO FIT OUR PURPOSE (Herreweb)
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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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var snowStorm=function(g,f){function k(a,d){isNaN(d)&&(d=0);return Math.random()*a+d}function x(){g.setTimeout(function(){a.start(!0)},20);a.events.remove(m?f:g,"mousemove",x)}function y(){(!a.excludeMobile||!D)&&x();a.events.remove(g,"load",y)}this.excludeMobile=this.autoStart=!0;this.flakesMax=8;this.flakesMaxActive=64;this.animationInterval=33;this.useGPU=!0;this.className=null;this.excludeMobile=!0;this.flakeBottom=null;this.followMouse=!0;this.snowColor="#a86032";this.snowCharacter="☸";this.snowStick=
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!0;this.targetElement=null;this.useMeltEffect=!0;this.usePixelPosition=this.usePositionFixed=this.useTwinkleEffect=!1;this.freezeOnBlur=!0;this.flakeRightOffset=this.flakeLeftOffset=0;this.flakeHeight=this.flakeWidth=400;this.vMaxX=5;this.vMaxY=4;this.zIndex=0;var a=this,q,m=navigator.userAgent.match(/msie/i),E=navigator.userAgent.match(/msie 6/i),D=navigator.userAgent.match(/mobile|opera m(ob|in)/i),r=m&&"BackCompat"===f.compatMode||E,h=null,n=null,l=null,p=null,s=null,z=null,A=null,v=1,t=!1,w=!1,
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u;a:{try{f.createElement("div").style.opacity="0.2"}catch(F){u=!1;break a}u=!0}var B=!1,C=f.createDocumentFragment();q=function(){function c(b){g.setTimeout(b,1E3/(a.animationInterval||20))}function d(a){return void 0!==h.style[a]?a:null}var e,b=g.requestAnimationFrame||g.webkitRequestAnimationFrame||g.mozRequestAnimationFrame||g.oRequestAnimationFrame||g.msRequestAnimationFrame||c;e=b?function(){return b.apply(g,arguments)}:null;var h;h=f.createElement("div");e={transform:{ie:d("-ms-transform"),
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moz:d("MozTransform"),opera:d("OTransform"),webkit:d("webkitTransform"),w3:d("transform"),prop:null},getAnimationFrame:e};e.transform.prop=e.transform.w3||e.transform.moz||e.transform.webkit||e.transform.ie||e.transform.opera;h=null;return e}();this.timer=null;this.flakes=[];this.active=this.disabled=!1;this.meltFrameCount=20;this.meltFrames=[];this.setXY=function(c,d,e){if(!c)return!1;a.usePixelPosition||w?(c.style.left=d-a.flakeWidth+"px",c.style.top=e-a.flakeHeight+"px"):r?(c.style.right=100-100*
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(d/h)+"%",c.style.top=Math.min(e,s-a.flakeHeight)+"px"):a.flakeBottom?(c.style.right=100-100*(d/h)+"%",c.style.top=Math.min(e,s-a.flakeHeight)+"px"):(c.style.right=100-100*(d/h)+"%",c.style.bottom=100-100*(e/l)+"%")};this.events=function(){function a(c){c=b.call(c);var d=c.length;e?(c[1]="on"+c[1],3<d&&c.pop()):3===d&&c.push(!1);return c}function d(a,b){var c=a.shift(),d=[f[b]];if(e)c[d](a[0],a[1]);else c[d].apply(c,a)}var e=!g.addEventListener&&g.attachEvent,b=Array.prototype.slice,f={add:e?"attachEvent":
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"addEventListener",remove:e?"detachEvent":"removeEventListener"};return{add:function(){d(a(arguments),"add")},remove:function(){d(a(arguments),"remove")}}}();this.randomizeWind=function(){var c;c=k(a.vMaxX,0.2);z=1===parseInt(k(2),10)?-1*c:c;A=k(a.vMaxY,0.2);if(this.flakes)for(c=0;c<this.flakes.length;c++)this.flakes[c].active&&this.flakes[c].setVelocities()};this.scrollHandler=function(){var c;p=a.flakeBottom?0:parseInt(g.scrollY||f.documentElement.scrollTop||(r?f.body.scrollTop:0),10);isNaN(p)&&
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(p=0);if(!t&&!a.flakeBottom&&a.flakes)for(c=0;c<a.flakes.length;c++)0===a.flakes[c].active&&a.flakes[c].stick()};this.resizeHandler=function(){g.innerWidth||g.innerHeight?(h=g.innerWidth-16-a.flakeRightOffset,l=a.flakeBottom||g.innerHeight):(h=(f.documentElement.clientWidth||f.body.clientWidth||f.body.scrollWidth)-(!m?8:0)-a.flakeRightOffset,l=a.flakeBottom||f.documentElement.clientHeight||f.body.clientHeight||f.body.scrollHeight);s=f.body.offsetHeight;n=parseInt(h/2,10)};this.resizeHandlerAlt=function(){h=
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a.targetElement.offsetWidth-a.flakeRightOffset;l=a.flakeBottom||a.targetElement.offsetHeight;n=parseInt(h/2,10);s=f.body.offsetHeight};this.freeze=function(){if(a.disabled)return!1;a.disabled=1;a.timer=null};this.resume=function(){if(a.disabled)a.disabled=0;else return!1;a.timerInit()};this.toggleSnow=function(){a.flakes.length?(a.active=!a.active,a.active?(a.show(),a.resume()):(a.stop(),a.freeze())):a.start()};this.stop=function(){var c;this.freeze();for(c=0;c<this.flakes.length;c++)this.flakes[c].o.style.display=
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"none";a.events.remove(g,"scroll",a.scrollHandler);a.events.remove(g,"resize",a.resizeHandler);a.freezeOnBlur&&(m?(a.events.remove(f,"focusout",a.freeze),a.events.remove(f,"focusin",a.resume)):(a.events.remove(g,"blur",a.freeze),a.events.remove(g,"focus",a.resume)))};this.show=function(){var a;for(a=0;a<this.flakes.length;a++)this.flakes[a].o.style.display="block"};this.SnowFlake=function(c,d,e){var b=this;this.type=c;this.x=d||parseInt(k(h-20),10);this.y=!isNaN(e)?e:-k(l)-12;this.vY=this.vX=null;
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this.vAmpTypes=[1,1.2,1.4,1.6,1.8];this.vAmp=this.vAmpTypes[this.type]||1;this.melting=!1;this.meltFrameCount=a.meltFrameCount;this.meltFrames=a.meltFrames;this.twinkleFrame=this.meltFrame=0;this.active=1;this.fontSize=10+10*(this.type/5);this.o=f.createElement("div");this.o.innerHTML=a.snowCharacter;a.className&&this.o.setAttribute("class",a.className);this.o.style.color=a.snowColor;this.o.style.position=t?"fixed":"absolute";a.useGPU&&q.transform.prop&&(this.o.style[q.transform.prop]="translate3d(0px, 0px, 0px)");
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this.o.style.width=a.flakeWidth+"px";this.o.style.height=a.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=a.zIndex;C.appendChild(this.o);this.refresh=function(){if(isNaN(b.x)||isNaN(b.y))return!1;a.setXY(b.o,b.x,b.y)};this.stick=function(){r||a.targetElement!==f.documentElement&&a.targetElement!==f.body?b.o.style.top=l+p-a.flakeHeight+"px":a.flakeBottom?b.o.style.top=a.flakeBottom+
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"px":(b.o.style.display="none",b.o.style.top="auto",b.o.style.bottom="0%",b.o.style.position="fixed",b.o.style.display="block")};this.vCheck=function(){0<=b.vX&&0.2>b.vX?b.vX=0.2:0>b.vX&&-0.2<b.vX&&(b.vX=-0.2);0<=b.vY&&0.2>b.vY&&(b.vY=0.2)};this.move=function(){var c=b.vX*v;b.x+=c;b.y+=b.vY*b.vAmp;b.x>=h||h-b.x<a.flakeWidth?b.x=0:0>c&&b.x-a.flakeLeftOffset<-a.flakeWidth&&(b.x=h-a.flakeWidth-1);b.refresh();l+p-b.y+a.flakeHeight<a.flakeHeight?(b.active=0,a.snowStick?b.stick():b.recycle()):(a.useMeltEffect&&
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(b.active&&3>b.type&&!b.melting&&0.998<Math.random())&&(b.melting=!0,b.melt()),a.useTwinkleEffect&&(0>b.twinkleFrame?0.97<Math.random()&&(b.twinkleFrame=parseInt(8*Math.random(),10)):(b.twinkleFrame--,u?b.o.style.opacity=b.twinkleFrame&&0===b.twinkleFrame%2?0:1:b.o.style.visibility=b.twinkleFrame&&0===b.twinkleFrame%2?"hidden":"visible")))};this.animate=function(){b.move()};this.setVelocities=function(){b.vX=z+k(0.12*a.vMaxX,0.1);b.vY=A+k(0.12*a.vMaxY,0.1)};this.setOpacity=function(a,b){if(!u)return!1;
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a.style.opacity=b};this.melt=function(){!a.useMeltEffect||!b.melting?b.recycle():b.meltFrame<b.meltFrameCount?(b.setOpacity(b.o,b.meltFrames[b.meltFrame]),b.o.style.fontSize=b.fontSize-b.fontSize*(b.meltFrame/b.meltFrameCount)+"px",b.o.style.lineHeight=a.flakeHeight+2+0.75*a.flakeHeight*(b.meltFrame/b.meltFrameCount)+"px",b.meltFrame++):b.recycle()};this.recycle=function(){b.o.style.display="none";b.o.style.position=t?"fixed":"absolute";b.o.style.bottom="auto";b.setVelocities();b.vCheck();b.meltFrame=
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0;b.melting=!1;b.setOpacity(b.o,1);b.o.style.padding="0px";b.o.style.margin="0px";b.o.style.fontSize=b.fontSize+"px";b.o.style.lineHeight=a.flakeHeight+2+"px";b.o.style.textAlign="center";b.o.style.verticalAlign="baseline";b.x=parseInt(k(h-a.flakeWidth-20),10);b.y=parseInt(-1*k(l),10)-a.flakeHeight;b.refresh();b.o.style.display="block";b.active=1};this.recycle();this.refresh()};this.snow=function(){var c=0,d=null,e,d=0;for(e=a.flakes.length;d<e;d++)1===a.flakes[d].active&&(a.flakes[d].move(),c++),
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a.flakes[d].melting&&a.flakes[d].melt();c<a.flakesMaxActive&&(d=a.flakes[parseInt(k(a.flakes.length),10)],0===d.active&&(d.melting=!0));a.timer&&q.getAnimationFrame(a.snow)};this.mouseMove=function(c){if(!a.followMouse)return!0;c=parseInt(c.clientX,10);c<n?v=-2+2*(c/n):(c-=n,v=2*(c/n))};this.createSnow=function(c,d){var e;for(e=0;e<c;e++)if(a.flakes[a.flakes.length]=new a.SnowFlake(parseInt(k(6),10)),d||e>a.flakesMaxActive)a.flakes[a.flakes.length-1].active=-1;a.targetElement.appendChild(C)};this.timerInit=
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function(){a.timer=!0;a.snow()};this.init=function(){var c;for(c=0;c<a.meltFrameCount;c++)a.meltFrames.push(1-c/a.meltFrameCount);a.randomizeWind();a.createSnow(a.flakesMax);a.events.add(g,"resize",a.resizeHandler);a.events.add(g,"scroll",a.scrollHandler);a.freezeOnBlur&&(m?(a.events.add(f,"focusout",a.freeze),a.events.add(f,"focusin",a.resume)):(a.events.add(g,"blur",a.freeze),a.events.add(g,"focus",a.resume)));a.resizeHandler();a.scrollHandler();a.followMouse&&a.events.add(m?f:g,"mousemove",a.mouseMove);
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a.animationInterval=Math.max(20,a.animationInterval);a.timerInit()};this.start=function(c){if(B){if(c)return!0}else B=!0;if("string"===typeof a.targetElement&&(c=a.targetElement,a.targetElement=f.getElementById(c),!a.targetElement))throw Error('Snowstorm: Unable to get targetElement "'+c+'"');a.targetElement||(a.targetElement=f.body||f.documentElement);a.targetElement!==f.documentElement&&a.targetElement!==f.body&&(a.resizeHandler=a.resizeHandlerAlt,a.usePixelPosition=!0);a.resizeHandler();a.usePositionFixed=
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a.usePositionFixed&&!r&&!a.flakeBottom;if(g.getComputedStyle)try{w="relative"===g.getComputedStyle(a.targetElement,null).getPropertyValue("position")}catch(d){w=!1}t=a.usePositionFixed;h&&(l&&!a.disabled)&&(a.init(),a.active=!0)};a.autoStart&&a.events.add(g,"load",y,!1);return this}(window,document);
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