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Filename : smoothscroll.min.js
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// SmoothScroll for websites v1.2.1
// Licensed under the terms of the MIT license.

// People involved
//  - Balazs Galambosi (maintainer)  
//  - Michael Herf     (Pulse Algorithm)

!function(){function e(){var e=!1;e&&c("keydown",o),g.keyboardSupport&&!e&&u("keydown",o)}function t(){if(document.body){var t=document.body,r=document.documentElement,a=window.innerHeight,o=t.scrollHeight;if(x=document.compatMode.indexOf("CSS")>=0?r:t,w=t,e(),S=!0,top!=self)y=!0;else if(o>a&&(t.offsetHeight<=a||r.offsetHeight<=a)&&(r.style.height="auto",x.offsetHeight<=a)){var n=document.createElement("div");n.style.clear="both",t.appendChild(n)}g.fixedBackground||b||(t.style.backgroundAttachment="scroll",r.style.backgroundAttachment="scroll")}}function r(e,t,r,a){if(a||(a=1e3),d(t,r),1!=g.accelerationMax){var o=+new Date,n=o-T;if(n<g.accelerationDelta){var i=(1+30/n)/2;i>1&&(i=Math.min(i,g.accelerationMax),t*=i,r*=i)}T=+new Date}if(M.push({x:t,y:r,lastX:0>t?.99:-.99,lastY:0>r?.99:-.99,start:+new Date}),!C){var l=e===document.body,u=function(){for(var o=+new Date,n=0,i=0,c=0;c<M.length;c++){var s=M[c],d=o-s.start,f=d>=g.animationTime,p=f?1:d/g.animationTime;g.pulseAlgorithm&&(p=h(p));var m=s.x*p-s.lastX>>0,w=s.y*p-s.lastY>>0;n+=m,i+=w,s.lastX+=m,s.lastY+=w,f&&(M.splice(c,1),c--)}l?window.scrollBy(n,i):(n&&(e.scrollLeft+=n),i&&(e.scrollTop+=i)),t||r||(M=[]),M.length?E(u,e,a/g.frameRate+1):C=!1};E(u,e,0),C=!0}}function a(e){S||t();var a=e.target,o=l(a);if(!o||e.defaultPrevented||s(w,"embed")||s(a,"embed")&&/\.pdf/i.test(a.src))return!0;var n=e.wheelDeltaX||0,i=e.wheelDeltaY||0;return n||i||(i=e.wheelDelta||0),!g.touchpadSupport&&f(i)?!0:(Math.abs(n)>1.2&&(n*=g.stepSize/120),Math.abs(i)>1.2&&(i*=g.stepSize/120),r(o,-n,-i),void e.preventDefault())}function o(e){var t=e.target,a=e.ctrlKey||e.altKey||e.metaKey||e.shiftKey&&e.keyCode!==H.spacebar;if(/input|textarea|select|embed/i.test(t.nodeName)||t.isContentEditable||e.defaultPrevented||a)return!0;if(s(t,"button")&&e.keyCode===H.spacebar)return!0;var o,n=0,i=0,u=l(w),c=u.clientHeight;switch(u==document.body&&(c=window.innerHeight),e.keyCode){case H.up:i=-g.arrowScroll;break;case H.down:i=g.arrowScroll;break;case H.spacebar:o=e.shiftKey?1:-1,i=-o*c*.9;break;case H.pageup:i=.9*-c;break;case H.pagedown:i=.9*c;break;case H.home:i=-u.scrollTop;break;case H.end:var d=u.scrollHeight-u.scrollTop-c;i=d>0?d+10:0;break;case H.left:n=-g.arrowScroll;break;case H.right:n=g.arrowScroll;break;default:return!0}r(u,n,i),e.preventDefault()}function n(e){w=e.target}function i(e,t){for(var r=e.length;r--;)z[N(e[r])]=t;return t}function l(e){var t=[],r=x.scrollHeight;do{var a=z[N(e)];if(a)return i(t,a);if(t.push(e),r===e.scrollHeight){if(!y||x.clientHeight+10<r)return i(t,document.body)}else if(e.clientHeight+10<e.scrollHeight&&(overflow=getComputedStyle(e,"").getPropertyValue("overflow-y"),"scroll"===overflow||"auto"===overflow))return i(t,e)}while(e=e.parentNode)}function u(e,t,r){window.addEventListener(e,t,r||!1)}function c(e,t,r){window.removeEventListener(e,t,r||!1)}function s(e,t){return(e.nodeName||"").toLowerCase()===t.toLowerCase()}function d(e,t){e=e>0?1:-1,t=t>0?1:-1,(k.x!==e||k.y!==t)&&(k.x=e,k.y=t,M=[],T=0)}function f(e){if(e){e=Math.abs(e),D.push(e),D.shift(),clearTimeout(A);var t=D[0]==D[1]&&D[1]==D[2],r=p(D[0],120)&&p(D[1],120)&&p(D[2],120);return!(t||r)}}function p(e,t){return Math.floor(e/t)==e/t}function m(e){var t,r,a;return e*=g.pulseScale,1>e?t=e-(1-Math.exp(-e)):(r=Math.exp(-1),e-=1,a=1-Math.exp(-e),t=r+a*(1-r)),t*g.pulseNormalize}function h(e){return e>=1?1:0>=e?0:(1==g.pulseNormalize&&(g.pulseNormalize/=m(1)),m(e))}var w,v={frameRate:150,animationTime:1800,stepSize:85,pulseAlgorithm:!0,pulseScale:8,pulseNormalize:1,accelerationDelta:20,accelerationMax:1,keyboardSupport:!0,arrowScroll:50,touchpadSupport:!0,fixedBackground:!0,excluded:""},g=v,b=!1,y=!1,k={x:0,y:0},S=!1,x=document.documentElement,D=[120,120,120],H={left:37,up:38,right:39,down:40,spacebar:32,pageup:33,pagedown:34,end:35,home:36},g=v,M=[],C=!1,T=+new Date,z={};setInterval(function(){z={}},1e4);var A,N=function(){var e=0;return function(t){return t.uniqueID||(t.uniqueID=e++)}}(),E=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||function(e,t,r){window.setTimeout(e,r||1e3/60)}}(),K=/chrome/i.test(window.navigator.userAgent),L="onmousewheel"in document;L&&K&&(u("mousedown",n),u("mousewheel",a),u("load",t))}();