scrollAnimate.min.js

!function(window){function _log(msg){console.error(msg)}function _pad(character,num,size){for(var s=""+num,c=character||"0";s.length<size;)s=c+s;return s}function _downloadAssets(routes,onAllLoaded){function onload(){0==--numLoading&&onAllLoaded()}var i,img,numLoading=routes.length,images=[];for(i=0;i<routes.length;i++)(img=images[i]=new Image).src=routes[i],img.onload=onload;return images}function _animationStart(){var width,height,canvas;width=assets[0].width,height=assets[0].height,(canvas=document.createElement("canvas")).width=width,canvas.height=height,parent.appendChild(canvas),context=canvas.getContext("2d"),window.requestAnimationFrame(_animationFrame)}var parent,latestFrame,context,assets=[],scroll={start:0,length:100},_animationFrame=function(){var n,start1,stop1,start2,stop2,newVal,frame=(n=window.scrollY,start1=scroll.start,stop1=scroll.length,start2=0,stop2=assets.length-1,newVal=(n-start1)/(stop1-start1)*(stop2-start2)+start2,Math.floor(Math.max(Math.min(newVal,stop2),start2)));frame!==latestFrame&&(latestFrame=frame,context.drawImage(assets[latestFrame],0,0)),window.requestAnimationFrame(_animationFrame)};void 0===window.scrollAnimate&&(window.scrollAnimate=function(params){void 0!==params?!(parent="string"==typeof params.parent?document.querySelector(params.parent):params.parent)||parent.length<=0?_log("Parent element not found!"):"object"==typeof params.scroll?(scroll.start=params.scroll.start,scroll.length=scroll.start+params.scroll.length,Array.isArray(params.frames)?assets=_downloadAssets(params.frames,_animationStart):"object"==typeof params.frames?assets=_downloadAssets(function(path,prefix,extension,count,pad){var assetNumber,routes=[],padString="";for("/"!==path.split("")[path.length-1]&&(path+="/"),0!==extension.indexOf(".")&&(extension="."+extension),"string"==typeof pad&&(padString=pad.substr(0,1)),assetNumber=0;assetNumber<count;assetNumber++)routes.push(path+prefix+_pad(padString,assetNumber,pad.length)+extension);return routes}(params.frames.path,params.frames.prefix,params.frames.extension,params.frames.amount,!!params.frames.pad&&params.frames.pad),_animationStart):_log("Invalid frames argument!")):_log("Invalid scroll argument!"):_log("Invalid Settings!")})}(window);