Template:USTC-Software/js/autoMenu2

jQuery.extend(jQuery.easing, {

   easeInOutCubic: function (x, t, b, c, d) {
       if ((t/=d/2) < 1) return c/2*t*t*t + b;
       return c/2*((t-=2)*t*t + 2) + b;
   }

});

$(document).ready(function(){

   // set up and create progress bar in DOM

$('.autoMenu2').eq(0).before('

');

   var container = $('.progressbar');

container.append('

');

   var shim = $('.progressbar .shim');

container.append('

');

   var holder = $('.progressbar .holder');

holder.append('

');

   var bar = $('.progressbar .bar');

bar.append('

');

   var indicator = $('.progressbar .indicator');

holder.append('

');

   var labels = $('.progressbar .labels');

holder.append('

');

   var labelsInner = $('.progressbar .labelsInner');
   $('.card h3, .card h4, .card h2.ref').each(function(){
       var text = $(this).text();
       var end = text.indexOf(' ');
       if(end > text.indexOf(':') && text.indexOf(':') !== -1) end = text.indexOf(':');
       end = end === -1 ? text.length : end;
       var code = '';
       console.log($(this));
       if($(this).is('H4')){
           code = '';
       }else if($(this).is('H2')){
           code = ''
       }
       labels.append(code);
   });

   var points = labels.find('i');
   points.css('width', 100/$('h3, h2.ref, h4').length+'%');

   // var points = labelsInner.find('i');
   // points.css('width', 100/$('h3, h2.ref, h4').length+'%');

   // var points = labels.find('i.innerTitle');
   // points.css('width', "1%");
   // $('h4').each(function () {
   //     var code = '';
   //     labels.append(code);
   // })
   //
   // points = labels.find('i');
   // points.css('width', 100/$('h4').length+'%');
   // match height of shim
   // stop layout jumping when progress bar fixes to / unfixes
   // from top of viewport
   function setShimHeight(){
       shim.css('height', container.height()+'px');
   }
   setShimHeight();
   $(window).resize(function(){ setShimHeight(); });

   // position indicator bar so it starts at first dot
   function setIndicatorX(){
       var point = points.eq(0);
       var xpos = point.offset().left + (point.width() / 2);
       indicator.css('left', xpos+'px');
   }
   setIndicatorX();
   $(window).resize(function(){ setIndicatorX(); });

   // fix/unfix progress bar to top of viewport
   function fixPosition(){
       if(container.is(':visible')) {
           if(!container.hasClass('fixed')) {
               if(holder.offset().top <= $(window).scrollTop()) {
                   container.addClass('fixed');
               }
           }
           else {
               if(shim.offset().top > $(window).scrollTop()) {
                   container.removeClass('fixed');
               }
           }
       }
   }
   fixPosition();
   $(window).scroll(function(){ fixPosition() });
   $(window).resize(function(){ fixPosition(); });

   // set trigger point
   // i.e. how far down viewport is the "eye line"
   var triggerPoint = 0;
   function setTriggerPoint(){
       triggerPoint = $(window).height() * .18;
   }
   setTriggerPoint();
   $(window).resize(function(){ setTriggerPoint(); });

   // update progress bar
   function setPosition(){
       if(container.is(':visible')) {
           var section = false;
           var sectionIndex = 0;
           var currentPosition = $(window).scrollTop() + triggerPoint;
           // dots
           // if before first section
           if(currentPosition < $('.card h3, .card h4, .card h2.ref').eq(0).offset().top) {
               points.removeClass('reading read');
               section = -1;
           }
           // if after first section
           else {
               $('.card h3, .card h4, .card h2.ref').each(function(){
                   var sectionTop = $(this).offset().top;
                   if(currentPosition >= sectionTop) {
                       points.removeClass('reading');
                       points.eq(sectionIndex).addClass('reading');
                       points.eq(sectionIndex).addClass('read');
                       section = sectionIndex;
                   }
                   else {
                       points.eq(sectionIndex).removeClass('read');
                   }
                   sectionIndex++;
               });
           }
           // bar
           var barWidth = 0;
           // if before start
           if(section == -1) {
               var point = points.eq(0);
               barWidth = point.offset().left + (point.width() / 2);
           }
           // if after end
           else if(section >= (points.length - 1)) {
               var point = points.eq((points.length - 1));
               barWidth = point.offset().left + (point.width() / 2);
           }
           // if within document
           else {
               var startPoint = points.eq(section);
               var startPointX = startPoint.offset().left;
               var startPointWidth = startPoint.width();
               var startSection = $('.card h3, .card h4, .card h2.ref').eq(section);
               var endSection = $('.card h3, .card h4, .card h2.ref').eq(section+1);
               var startSectionY = startSection.offset().top;
               var endSectionY = endSection.offset().top;
               var sectionLength = endSectionY - startSectionY;
               var scrollY = currentPosition - startSectionY;
               var sectionProgress = scrollY / sectionLength;
               barWidth = startPointX + (startPointWidth / 2) + (startPointWidth * sectionProgress);
           }
           barWidth -= indicator.offset().left;
           indicator.css('width', barWidth+'px');
       }
   }
   setPosition();
   $(window).scroll(function(){ setPosition(); });
   $(window).resize(function(){ setPosition(); });

   // on click, scroll to target section
   points.click(function(){
       var sectionIndex = points.index($(this));
       var targetY = $('.card h3, .card h4, .card h2.ref').eq(sectionIndex).offset().top - (triggerPoint * .92);
       $('html, body').animate({scrollTop:targetY}, 600, 'easeInOutCubic');
   });

});