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@@ -91,6 +91,12 @@ var Reveal = (function(){
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// Transition style for full page slide backgrounds
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backgroundTransition: 'default', // default/linear/none
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+
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+ // Parallax background image
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+ parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')"
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+
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+ // Parallax background size
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+ parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
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// Number of slides away from the current that are visible
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viewDistance: 3,
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@@ -469,6 +475,25 @@ var Reveal = (function(){
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} );
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} );
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+
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+ // Add parallax background if specified so
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+ var parallaxBackgroundImage = config.parallaxBackgroundImage,
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+ parallaxBackgroundSize = config.parallaxBackgroundSize;
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+
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+ if (parallaxBackgroundImage) {
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+ dom.wrapper.style.background = parallaxBackgroundImage;
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+ dom.wrapper.style.backgroundSize = parallaxBackgroundSize;
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+
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+ // Make sure the below properties are set on the element - these properties are
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+ // needed for proper transitions to be set on the element via CSS. To remove
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+ // annoying background slide-in effect when the presentation starts, apply
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+ // these properties after short time delay
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+ setTimeout( function() {
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+ dom.wrapper.setAttribute('data-parallax-background', parallaxBackgroundImage);
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+ dom.wrapper.setAttribute('data-parallax-background-size', parallaxBackgroundSize);
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+ }, 1 );
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+
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+ }
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}
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@@ -1470,8 +1495,32 @@ var Reveal = (function(){
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// Store references to the previous and current slides
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currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
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-
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-
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+
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+ // Animate parallax background
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+ if (dom.wrapper.getAttribute('data-parallax-background') || config.parallaxBackgroundImage) {
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+ var bs = dom.wrapper.style.backgroundSize.split(' '),
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+ bgWidth, bgHeight;
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+
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+ if (bs.length === 1) {
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+ bgWidth = bgHeight = parseInt(bs[0], 10);
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+ } else {
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+ bgWidth = parseInt(bs[0], 10);
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+ bgHeight = parseInt(bs[1], 10);
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+ }
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+
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+
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+ var slideWidth = parseInt(dom.wrapper.offsetWidth, 10);
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+ var horizontalSlideCount = horizontalSlides.length;
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+ var horizontalOffset = -(bgWidth - slideWidth)/(horizontalSlideCount-1) * h;
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+
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+ var slideHeight = parseInt(dom.wrapper.offsetHeight, 10);
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+ var verticalSlideCount = currentVerticalSlides.length;
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+ var verticalOffset = verticalSlideCount > 0 ? -(bgHeight - slideHeight)/(verticalSlideCount-1) * v : 0;
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+
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+ dom.wrapper.style.backgroundPosition = horizontalOffset + 'px ' + verticalOffset + 'px';
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+ }
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+
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+ ////////////////////////////////////
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// Show fragment, if specified
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if( typeof f !== 'undefined' ) {
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var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );
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