text: // Custom reveal.js integration
  (function(){
  	var isEnabled = true;
  
  	document.querySelector( '.reveal .slides' ).addEventListener( 'mousedown', function( event ) {
  		var modifier = ( Reveal.getConfig().zoomKey ? Reveal.getConfig().zoomKey : 'alt' ) + 'Key';
  
  		var zoomPadding = 20;
  		var revealScale = Reveal.getScale();
  
  		if( event[ modifier ] && isEnabled ) {
  			event.preventDefault();
  
  			var bounds = event.target.getBoundingClientRect();
  
  			zoom.to({
  				x: ( bounds.left * revealScale ) - zoomPadding,
  				y: ( bounds.top * revealScale ) - zoomPadding,
  				width: ( bounds.width * revealScale ) + ( zoomPadding * 2 ),
  				height: ( bounds.height * revealScale ) + ( zoomPadding * 2 ),
  				pan: false
  			});
  		}
  	} );
  
  	Reveal.addEventListener( 'overviewshown', function() { isEnabled = false; } );
  	Reveal.addEventListener( 'overviewhidden', function() { isEnabled = true; } );
  })();
  
  /*!
   * zoom.js 0.3 (modified for use with reveal.js)
   * http://lab.hakim.se/zoom-js
   * MIT licensed
   *
   * Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
   */
  var zoom = (function(){
  
  	// The current zoom level (scale)
  	var level = 1;
  
  	// The current mouse position, used for panning
  	var mouseX = 0,
  		mouseY = 0;
  
  	// Timeout before pan is activated
  	var panEngageTimeout = -1,
  		panUpdateInterval = -1;
  
  	// Check for transform support so that we can fallback otherwise
  	var supportsTransforms = 	'WebkitTransform' in document.body.style ||
  								'MozTransform' in document.body.style ||
  								'msTransform' in document.body.style ||
  								'OTransform' in document.body.style ||
  								'transform' in document.body.style;
  
  	if( supportsTransforms ) {
  		// The easing that will be applied when we zoom in/out
  		document.body.style.transition = 'transform 0.8s ease';
  		document.body.style.OTransition = '-o-transform 0.8s ease';
  		document.body.style.msTransition = '-ms-transform 0.8s ease';
  		document.body.style.MozTransition = '-moz-transform 0.8s ease';
  		document.body.style.WebkitTransition = '-webkit-transform 0.8s ease';
  	}
  
  	// Zoom out if the user hits escape
  	document.addEventListener( 'keyup', function( event ) {
  		if( level !== 1 && event.keyCode === 27 ) {
  			zoom.out();
  		}
  	} );
  
  	// Monitor mouse movement for panning
  	document.addEventListener( 'mousemove', function( event ) {
  		if( level !== 1 ) {
  			mouseX = event.clientX;
  			mouseY = event.clientY;
  		}
  	} );
  
  	/**
  	 * Applies the CSS required to zoom in, prefers the use of CSS3
  	 * transforms but falls back on zoom for IE.
  	 *
  	 * @param {Object} rect
  	 * @param {Number} scale
  	 */
  	function magnify( rect, scale ) {
  
  		var scrollOffset = getScrollOffset();
  
  		// Ensure a width/height is set
  		rect.width = rect.width || 1;
  		rect.height = rect.height || 1;
  
  		// Center the rect within the zoomed viewport
  		rect.x -= ( window.innerWidth - ( rect.width * scale ) ) / 2;
  		rect.y -= ( window.innerHeight - ( rect.height * scale ) ) / 2;
  
  		if( supportsTransforms ) {
  			// Reset
  			if( scale === 1 ) {
  				document.body.style.transform = '';
  				document.body.style.OTransform = '';
  				document.body.style.msTransform = '';
  				document.body.style.MozTransform = '';
  				document.body.style.WebkitTransform = '';
  			}
  			// Scale
  			else {
  				var origin = scrollOffset.x +'px '+ scrollOffset.y +'px',
  					transform = 'translate('+ -rect.x +'px,'+ -rect.y +'px) scale('+ scale +')';
  
  				document.body.style.transformOrigin = origin;
  				document.body.style.OTransformOrigin = origin;
  				document.body.style.msTransformOrigin = origin;
  				document.body.style.MozTransformOrigin = origin;
  				document.body.style.WebkitTransformOrigin = origin;
  
  				document.body.style.transform = transform;
  				document.body.style.OTransform = transform;
  				document.body.style.msTransform = transform;
  				document.body.style.MozTransform = transform;
  				document.body.style.WebkitTransform = transform;
  			}
  		}
  		else {
  			// Reset
  			if( scale === 1 ) {
  				document.body.style.position = '';
  				document.body.style.left = '';
  				document.body.style.top = '';
  				document.body.style.width = '';
  				document.body.style.height = '';
  				document.body.style.zoom = '';
  			}
  			// Scale
  			else {
  				document.body.style.position = 'relative';
  				document.body.style.left = ( - ( scrollOffset.x + rect.x ) / scale ) + 'px';
  				document.body.style.top = ( - ( scrollOffset.y + rect.y ) / scale ) + 'px';
  				document.body.style.width = ( scale * 100 ) + '%';
  				document.body.style.height = ( scale * 100 ) + '%';
  				document.body.style.zoom = scale;
  			}
  		}
  
  		level = scale;
  
  		if( document.documentElement.classList ) {
  			if( level !== 1 ) {
  				document.documentElement.classList.add( 'zoomed' );
  			}
  			else {
  				document.documentElement.classList.remove( 'zoomed' );
  			}
  		}
  	}
  
  	/**
  	 * Pan the document when the mosue cursor approaches the edges
  	 * of the window.
  	 */
  	function pan() {
  		var range = 0.12,
  			rangeX = window.innerWidth * range,
  			rangeY = window.innerHeight * range,
  			scrollOffset = getScrollOffset();
  
  		// Up
  		if( mouseY < rangeY ) {
  			window.scroll( scrollOffset.x, scrollOffset.y - ( 1 - ( mouseY / rangeY ) ) * ( 14 / level ) );
  		}
  		// Down
  		else if( mouseY > window.innerHeight - rangeY ) {
  			window.scroll( scrollOffset.x, scrollOffset.y + ( 1 - ( window.innerHeight - mouseY ) / rangeY ) * ( 14 / level ) );
  		}
  
  		// Left
  		if( mouseX < rangeX ) {
  			window.scroll( scrollOffset.x - ( 1 - ( mouseX / rangeX ) ) * ( 14 / level ), scrollOffset.y );
  		}
  		// Right
  		else if( mouseX > window.innerWidth - rangeX ) {
  			window.scroll( scrollOffset.x + ( 1 - ( window.innerWidth - mouseX ) / rangeX ) * ( 14 / level ), scrollOffset.y );
  		}
  	}
  
  	function getScrollOffset() {
  		return {
  			x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
  			y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
  		}
  	}
  
  	return {
  		/**
  		 * Zooms in on either a rectangle or HTML element.
  		 *
  		 * @param {Object} options
  		 *   - element: HTML element to zoom in on
  		 *   OR
  		 *   - x/y: coordinates in non-transformed space to zoom in on
  		 *   - width/height: the portion of the screen to zoom in on
  		 *   - scale: can be used instead of width/height to explicitly set scale
  		 */
  		to: function( options ) {
  
  			// Due to an implementation limitation we can't zoom in
  			// to another element without zooming out first
  			if( level !== 1 ) {
  				zoom.out();
  			}
  			else {
  				options.x = options.x || 0;
  				options.y = options.y || 0;
  
  				// If an element is set, that takes precedence
  				if( !!options.element ) {
  					// Space around the zoomed in element to leave on screen
  					var padding = 20;
  					var bounds = options.element.getBoundingClientRect();
  
  					options.x = bounds.left - padding;
  					options.y = bounds.top - padding;
  					options.width = bounds.width + ( padding * 2 );
  					options.height = bounds.height + ( padding * 2 );
  				}
  
  				// If width/height values are set, calculate scale from those values
  				if( options.width !== undefined && options.height !== undefined ) {
  					options.scale = Math.max( Math.min( window.innerWidth / options.width, window.innerHeight / options.height ), 1 );
  				}
  
  				if( options.scale > 1 ) {
  					options.x *= options.scale;
  					options.y *= options.scale;
  
  					magnify( options, options.scale );
  
  					if( options.pan !== false ) {
  
  						// Wait with engaging panning as it may conflict with the
  						// zoom transition
  						panEngageTimeout = setTimeout( function() {
  							panUpdateInterval = setInterval( pan, 1000 / 60 );
  						}, 800 );
  
  					}
  				}
  			}
  		},
  
  		/**
  		 * Resets the document zoom state to its default.
  		 */
  		out: function() {
  			clearTimeout( panEngageTimeout );
  			clearInterval( panUpdateInterval );
  
  			magnify( { x: 0, y: 0 }, 1 );
  
  			level = 1;
  		},
  
  		// Alias
  		magnify: function( options ) { this.to( options ) },
  		reset: function() { this.out() },
  
  		zoomLevel: function() {
  			return level;
  		}
  	}
  
  })();
  