1/* http://keith-wood.name/backgroundPos.html 2 Background position animation for jQuery v1.1.1. 3 Written by Keith Wood (kbwood{at}iinet.com.au) November 2010. 4 Available under the MIT (https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt) license. 5 Please attribute the author if you use it. */ 6(function($){var g=!!$.Tween;if(g){$.Tween.propHooks['backgroundPosition']={get:function(a){return parseBackgroundPosition($(a.elem).css(a.prop))},set:setBackgroundPosition}}else{$.fx.step['backgroundPosition']=setBackgroundPosition};function parseBackgroundPosition(c){var d=(c||'').split(/ /);var e={center:'50%',left:'0%',right:'100%',top:'0%',bottom:'100%'};var f=function(a){var b=(e[d[a]]||d[a]||'50%').match(/^([+-]=)?([+-]?\d+(\.\d*)?)(.*)$/);d[a]=[b[1],parseFloat(b[2]),b[4]||'px']};if(d.length==1&&$.inArray(d[0],['top','bottom'])>-1){d[1]=d[0];d[0]='50%'}f(0);f(1);return d}function setBackgroundPosition(a){if(!a.set){initBackgroundPosition(a)}$(a.elem).css('background-position',((a.pos*(a.end[0][1]-a.start[0][1])+a.start[0][1])+a.end[0][2])+' '+((a.pos*(a.end[1][1]-a.start[1][1])+a.start[1][1])+a.end[1][2]))}
6function initBackgroundPosition(a){a.start=parseBackgroundPosition($(a.elem).css('backgroundPosition'));a.end=parseBackgroundPosition(a.end);for(var i=0;i<a.end.length;i++){if(a.end[i][0]){a.end[i][1]=a.start[i][1]+(a.end[i][0]=='-='?-1:+1)*a.end[i][1]}}a.set=true}})(jQuery);
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