Added parallax scrolling background

diff --git a/README.md b/README.md
index fd4254bc7f440160db0647d0c12817261f456045..55c8a743911973fca2df4a161b96a769dfca7c4a 100644 (file)
--- a/README.md
+++ b/README.md
@@ -108,6 +108,16 @@ Reveal.initialize({
 
        // Transition style for full page backgrounds
        backgroundTransition: 'default' // default/linear/none
+       
+       // Parallax background image
+       parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')"
+                       
+       // Parallax background size
+       parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
+
+       // Number of slides away from the current that are visible
+       viewDistance: 3,
+
 
 });
 ```
@@ -291,6 +301,30 @@ Slides are contained within a limited portion of the screen by default to allow
 
 Backgrounds transition using a fade animation by default. This can be changed to a linear sliding transition by passing ```backgroundTransition: 'slide'``` to the ```Reveal.initialize()``` call. Alternatively you can set ```data-background-transition``` on any section with a background to override that specific transition.
 
+### Parallax Background
+
+If you want to use the parallax scrolling background, set the two following config properties when initializing reveal.js (the third one is optional )
+
+```javascript
+Reveal.initialize({
+       
+       // Parallax background image
+       parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')"
+                       
+       // Parallax background size
+       parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px" - currently only pixels are supported (don't use % or auto)
+       
+       // This slide transition gives best results:
+       transition: linear
+
+});
+```
+
+Make sure that the background size is much bigger than screen size to allow for some scrolling.
+
+The image used in the background is made by Eli Mergel and is published under Creative Commons license on [Flickr](https://secure.flickr.com/photos/sp1te/3436256585/sizes/o/in/pool-856427@N25/).
+
+
 
 ### Slide Transitions
 The global presentation transition is set using the ```transition``` config value. You can override the global transition for a specific slide by using the ```data-transition``` attribute:

diff --git a/css/reveal.css b/css/reveal.css
index a9b3888ae37a75cb20b5c969740f7af2375af6a9..0b9d2e9674a613879729317d377f0107f5688f19 100644 (file)
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -1402,6 +1402,30 @@ body {
        float: right
 }
 
+/*********************************************
+ * PARALLAX BACKGROUND
+ *********************************************/
+.reveal[data-parallax-background] {
+       -webkit-transition: all 0.8s ease;
+          -moz-transition: all 0.8s ease;
+           -ms-transition: all 0.8s ease;
+               transition: all 0.8s ease;
+}
+
+/* Global transition speed settings */
+.reveal[data-parallax-background][data-transition-speed="fast"] {
+       -webkit-transition-duration: 400ms;
+          -moz-transition-duration: 400ms;
+           -ms-transition-duration: 400ms;
+               transition-duration: 400ms;
+}
+.reveal[data-parallax-background][data-transition-speed="slow"] {
+       -webkit-transition-duration: 1200ms;
+          -moz-transition-duration: 1200ms;
+           -ms-transition-duration: 1200ms;
+               transition-duration: 1200ms;
+}
+
 
 /*********************************************
  * LINK PREVIEW OVERLAY

diff --git a/css/reveal.min.css b/css/reveal.min.css
index 8db3675001a1b337f40aa3935dc3a87820b4f59e..55f1ef2d343b85228474680954809a1aed7fca12 100644 (file)
--- a/css/reveal.min.css
+++ b/css/reveal.min.css
@@ -4,4 +4,4 @@
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
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.icon{background-image:url(data:image/png;base64,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)}.reveal .preview-link-overlay header a.external .icon{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAcElEQVRYR+2WSQoAIQwEzf8f7XiOMkUQxUPlGkM3hVmiQfQR9GYnH1SsAQlI4DiBqkCMoNb9y2e90IAEJPAcgdznU9+engMaeJ7Azh5Y1U67gAho4DqBqmB1buAf0MB1AlVBek83ZPkmJMGc1wAR+AAqod/B97TRpQAAAABJRU5ErkJggg==)}.reveal .preview-link-overlay .viewport{position:absolute;top:40px;right:0;bottom:0;left:0}.reveal .preview-link-overlay .viewport iframe{width:100%;height:100%;max-width:100%;max-height:100%;border:0;opacity:0;visibility:hidden;-webkit-transition:all .3s ease;-moz-transition:all .3s ease;-ms-transition:all .3s ease;transition:all .3s ease}.reveal .preview-link-overlay.loaded .viewport iframe{opacity:1;visibility:visible}.reveal .preview-link-overlay.loaded .spinner{opacity:0;visibility:hidden;-webkit-transform:scale(0.2);-moz-transform:scale(0.2);-ms-transform:scale(0.2);transform:scale(0.2)}.reveal .roll{display:inline-block;line-height:1.2;overflow:hidden;vertical-align:top;-webkit-perspective:400px;-moz-perspective:400px;-ms-perspective:400px;perspective:400px;-webkit-perspective-origin:50% 50%;-moz-perspective-origin:50% 50%;-ms-perspective-origin:50% 50%;perspective-origin:50% 50%}.reveal .roll:hover{background:0;text-shadow:none}.reveal .roll span{display:block;position:relative;padding:0 2px;pointer-events:none;-webkit-transition:all 400ms ease;-moz-transition:all 400ms ease;-ms-transition:all 400ms ease;transition:all 400ms ease;-webkit-transform-origin:50% 0;-moz-transform-origin:50% 0;-ms-transform-origin:50% 0;transform-origin:50% 0;-webkit-transform-style:preserve-3d;-moz-transform-style:preserve-3d;-ms-transform-style:preserve-3d;transform-style:preserve-3d;-webkit-backface-visibility:hidden;-moz-backface-visibility:hidden;backface-visibility:hidden}.reveal .roll:hover span{background:rgba(0,0,0,.5);-webkit-transform:translate3d(0px,0,-45px) rotateX(90deg);-moz-transform:translate3d(0px,0,-45px) rotateX(90deg);-ms-transform:translate3d(0px,0,-45px) rotateX(90deg);transform:translate3d(0px,0,-45px) rotateX(90deg)}.reveal .roll span:after{content:attr(data-title);display:block;position:absolute;left:0;top:0;padding:0 2px;-webkit-backface-visibility:hidden;-moz-backface-visibility:hidden;backface-visibility:hidden;-webkit-transform-origin:50% 0;-moz-transform-origin:50% 0;-ms-transform-origin:50% 0;transform-origin:50% 0;-webkit-transform:translate3d(0px,110%,0) rotateX(-90deg);-moz-transform:translate3d(0px,110%,0) rotateX(-90deg);-ms-transform:translate3d(0px,110%,0) rotateX(-90deg);transform:translate3d(0px,110%,0) rotateX(-90deg)}.reveal aside.notes{display:none}.zoomed .reveal *,.zoomed .reveal :before,.zoomed .reveal :after{-webkit-transform:none!important;-moz-transform:none!important;-ms-transform:none!important;transform:none!important;-webkit-backface-visibility:visible!important;-moz-backface-visibility:visible!important;-ms-backface-visibility:visible!important;backface-visibility:visible!important}.zoomed .reveal .progress,.zoomed .reveal .controls{opacity:0}.zoomed .reveal .roll span{background:0}.zoomed .reveal .roll span:after{visibility:hidden}
\ No newline at end of file

diff --git a/img/nyc.jpg b/img/nyc.jpg
new file mode 100644 (file)
index 0000000..420c15b
Binary files /dev/null and b/img/nyc.jpg differ

diff --git a/index.html b/index.html
index a3bfd7d3323c40a149b97472fb7c0e3d530eb951..09c3c0c6226f13b11b2dae3a936136ff21a49efe 100644 (file)
--- a/index.html
+++ b/index.html
@@ -365,6 +365,10 @@ function linkify( selector ) {
 
                                theme: Reveal.getQueryHash().theme, // available themes are in /css/theme
                                transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/concave/zoom/linear/fade/none
+                               
+                               // Parallax scrolling
+                               parallaxBackgroundImage: "url('img/nyc.jpg')",
+                               parallaxBackgroundSize: "3600px 1018px",
 
                                // Optional libraries used to extend on reveal.js
                                dependencies: [

diff --git a/js/reveal.js b/js/reveal.js
index e1cd6236c3a65a0c21fe9c3ac4a8b35ba2eef38b..6562e65f8d44bc35ae1e8e6220f09b91713f840e 100644 (file)
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -88,6 +88,12 @@ var Reveal = (function(){
 
                        // Transition style for full page slide backgrounds
                        backgroundTransition: 'default', // default/linear/none
+                       
+                       // Parallax background image
+                       parallaxBackgroundImage: '', // CSS syntax, e.g. "url('a.jpg')"
+                       
+                       // Parallax background size
+                       parallaxBackgroundSize: '', // CSS syntax, e.g. "3000px 2000px"
 
                        // Number of slides away from the current that are visible
                        viewDistance: 3,
@@ -466,6 +472,25 @@ var Reveal = (function(){
                        } );
 
                } );
+               
+               // Add parallax background if specified so
+               var parallaxBackgroundImage = config.parallaxBackgroundImage,
+                       parallaxBackgroundSize = config.parallaxBackgroundSize;
+               
+               if (parallaxBackgroundImage) {
+                       dom.wrapper.style.background = parallaxBackgroundImage;
+                       dom.wrapper.style.backgroundSize = parallaxBackgroundSize;
+                       
+                       // Make sure the below properties are set on the element - these properties are
+                       // needed for proper transitions to be set on the element via CSS. To remove
+                       // annoying background slide-in effect when the presentation starts, apply
+                       // these properties after short time delay
+                       setTimeout( function() {
+                               dom.wrapper.setAttribute('data-parallax-background', parallaxBackgroundImage);
+                               dom.wrapper.setAttribute('data-parallax-background-size', parallaxBackgroundSize);
+                       }, 1 );
+                       
+               }
 
        }
 
@@ -1467,8 +1492,35 @@ var Reveal = (function(){
 
                // Store references to the previous and current slides
                currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;
-
-
+               
+               // Animate parallax background
+               if (dom.wrapper.getAttribute('data-parallax-background') || config.parallaxBackgroundImage) {
+                       var bs = dom.wrapper.style.backgroundSize.split(' '),
+                               bgWidth, bgHeight;
+               
+                       if (bs.length === 1) {
+                               bgWidth = bgHeight = parseInt(bs[0], 10);
+                       } else {
+                               bgWidth = parseInt(bs[0], 10);
+                               bgHeight = parseInt(bs[1], 10);
+                       }
+                       
+               
+                       var slideWidth = parseInt(dom.wrapper.offsetWidth, 10);
+                       var horizontalSlideCount = horizontalSlides.length;
+                       var horizontalOffset = -(bgWidth - slideWidth)/(horizontalSlideCount-1) * h;
+               
+                       dom.wrapper.style.backgroundPositionX = horizontalOffset + 'px';
+               
+               
+                       var slideHeight = parseInt(dom.wrapper.offsetHeight, 10);
+                       var verticalSlideCount = currentVerticalSlides.length;
+                       var verticalOffset = verticalSlideCount > 0 ? -(bgHeight - slideHeight)/(verticalSlideCount-1) * v : 0;
+               
+                       dom.wrapper.style.backgroundPositionY = verticalOffset + 'px';
+               }
+                               
+               ////////////////////////////////////
                // Show fragment, if specified
                if( typeof f !== 'undefined' ) {
                        var fragments = sortFragments( currentSlide.querySelectorAll( '.fragment' ) );

diff --git a/js/reveal.min.js b/js/reveal.min.js
index 659fb8baa23edf2671be60ec51e7e8ae24dabf1c..4f4c6d9735401568ba0e182ff21bec01d93a9740 100644 (file)
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.6.0-dev (2013-09-04, 08:56)
+ * reveal.js 2.6.0-dev (2013-09-10, 21:10)
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
  */
-var Reveal=function(){"use strict";function a(a){return b(),Kb||Jb?(window.addEventListener("load",C,!1),l(Qb,a),s(),c(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function b(){Jb="WebkitPerspective"in document.body.style||"MozPerspective"in document.body.style||"msPerspective"in document.body.style||"OPerspective"in document.body.style||"perspective"in document.body.style,Kb="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,Lb=navigator.userAgent.match(/(iphone|ipod|android)/gi)}function c(){function a(){c.length&&head.js.apply(null,c),d()}for(var b=[],c=[],e=0,f=Qb.dependencies.length;f>e;e++){var g=Qb.dependencies[e];(!g.condition||g.condition())&&(g.async?c.push(g.src):b.push(g.src),"function"==typeof g.callback&&head.ready(g.src.match(/([\w\d_\-]*)\.?js$|[^\\\/]*$/i)[0],g.callback))}b.length?(head.ready(a),head.js.apply(null,b)):a()}function d(){f(),e(),i(),_(),setTimeout(function(){Vb.slides.classList.remove("no-transition"),Rb=!0,u("ready",{indexh:Fb,indexv:Gb,currentSlide:Ib})},1)}function e(){var a=m(document.querySelectorAll(Nb));a.forEach(function(a){var b=m(a.querySelectorAll("section"));b.forEach(function(a,b){b>0&&a.classList.add("future")})})}function f(){Vb.theme=document.querySelector("#theme"),Vb.wrapper=document.querySelector(".reveal"),Vb.slides=document.querySelector(".reveal .slides"),Vb.slides.classList.add("no-transition"),Vb.background=g(Vb.wrapper,"div","backgrounds",null),Vb.progress=g(Vb.wrapper,"div","progress","<span></span>"),Vb.progressbar=Vb.progress.querySelector("span"),g(Vb.wrapper,"aside","controls",'<div class="navigate-left"></div><div class="navigate-right"></div><div class="navigate-up"></div><div class="navigate-down"></div>'),g(Vb.wrapper,"div","state-background",null),g(Vb.wrapper,"div","pause-overlay",null),Vb.controls=document.querySelector(".reveal .controls"),Vb.controlsLeft=m(document.querySelectorAll(".navigate-left")),Vb.controlsRight=m(document.querySelectorAll(".navigate-right")),Vb.controlsUp=m(document.querySelectorAll(".navigate-up")),Vb.controlsDown=m(document.querySelectorAll(".navigate-down")),Vb.controlsPrev=m(document.querySelectorAll(".navigate-prev")),Vb.controlsNext=m(document.querySelectorAll(".navigate-next"))}function g(a,b,c,d){var e=a.querySelector("."+c);return e||(e=document.createElement(b),e.classList.add(c),null!==d&&(e.innerHTML=d),a.appendChild(e)),e}function h(){function a(a,b){var c={background:a.getAttribute("data-background"),backgroundSize:a.getAttribute("data-background-size"),backgroundImage:a.getAttribute("data-background-image"),backgroundColor:a.getAttribute("data-background-color"),backgroundRepeat:a.getAttribute("data-background-repeat"),backgroundPosition:a.getAttribute("data-background-position"),backgroundTransition:a.getAttribute("data-background-transition")},d=document.createElement("div");return d.className="slide-background",c.background&&(/^(http|file|\/\/)/gi.test(c.background)||/\.(png|jpg|jpeg|gif|bmp)$/gi.test(c.background)?d.style.backgroundImage="url("+c.background+")":d.style.background=c.background),c.backgroundSize&&(d.style.backgroundSize=c.backgroundSize),c.backgroundImage&&(d.style.backgroundImage='url("'+c.backgroundImage+'")'),c.backgroundColor&&(d.style.backgroundColor=c.backgroundColor),c.backgroundRepeat&&(d.style.backgroundRepeat=c.backgroundRepeat),c.backgroundPosition&&(d.style.backgroundPosition=c.backgroundPosition),c.backgroundTransition&&d.setAttribute("data-background-transition",c.backgroundTransition),b.appendChild(d),d}r()&&document.body.classList.add("print-pdf"),Vb.background.innerHTML="",Vb.background.classList.add("no-transition"),m(document.querySelectorAll(Nb)).forEach(function(b){var c;c=r()?a(b,b):a(b,Vb.background),m(b.querySelectorAll("section")).forEach(function(b){r()?a(b,b):a(b,c)})})}function i(a){if(Vb.wrapper.classList.remove(Qb.transition),"object"==typeof a&&l(Qb,a),Jb===!1&&(Qb.transition="linear"),Vb.wrapper.classList.add(Qb.transition),Vb.wrapper.setAttribute("data-transition-speed",Qb.transitionSpeed),Vb.wrapper.setAttribute("data-background-transition",Qb.backgroundTransition),Vb.controls.style.display=Qb.controls?"block":"none",Vb.progress.style.display=Qb.progress?"block":"none",Qb.rtl?Vb.wrapper.classList.add("rtl"):Vb.wrapper.classList.remove("rtl"),Qb.center?Vb.wrapper.classList.add("center"):Vb.wrapper.classList.remove("center"),Qb.mouseWheel?(document.addEventListener("DOMMouseScroll",tb,!1),document.addEventListener("mousewheel",tb,!1)):(document.removeEventListener("DOMMouseScroll",tb,!1),document.removeEventListener("mousewheel",tb,!1)),Qb.rollingLinks?v():w(),Qb.previewLinks?x():(y(),x("[data-preview-link]")),Qb.theme&&Vb.theme){var 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