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