impress_arrows_all.js

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a,b,c={top:0,left:0},d=this[0];return"fixed"===n.css(d,"position")?b=d.getBoundingClientRect():(a=this.offsetParent(),b=this.offset(),n.nodeName(a[0],"html")||(c=a.offset()),c.top+=n.css(a[0],"borderTopWidth",!0),c.left+=n.css(a[0],"borderLeftWidth",!0)),{top:b.top-c.top-n.css(d,"marginTop",!0),left:b.left-c.left-n.css(d,"marginLeft",!0)}}},offsetParent:function(){return this.map(function(){var a=this.offsetParent||dd;while(a&&!n.nodeName(a,"html")&&"static"===n.css(a,"position"))a=a.offsetParent;return a||dd})}}),n.each({scrollLeft:"pageXOffset",scrollTop:"pageYOffset"},function(a,b){var c=/Y/.test(b);n.fn[a]=function(d){return W(this,function(a,d,e){var f=ed(a);return void 0===e?f?b in f?f[b]:f.document.documentElement[d]:a[d]:void(f?f.scrollTo(c?n(f).scrollLeft():e,c?e:n(f).scrollTop()):a[d]=e)},a,d,arguments.length,null)}}),n.each(["top","left"],function(a,b){n.cssHooks[b]=Mb(l.pixelPosition,function(a,c){return c?(c=Kb(a,b),Ib.test(c)?n(a).position()[b]+"px":c):void 0})}),n.each({Height:"height",Width:"width"},function(a,b){n.each({padding:"inner"+a,content:b,"":"outer"+a},function(c,d){n.fn[d]=function(d,e){var f=arguments.length&&(c||"boolean"!=typeof d),g=c||(d===!0||e===!0?"margin":"border");return W(this,function(b,c,d){var e;return n.isWindow(b)?b.document.documentElement["client"+a]:9===b.nodeType?(e=b.documentElement,Math.max(b.body["scroll"+a],e["scroll"+a],b.body["offset"+a],e["offset"+a],e["client"+a])):void 0===d?n.css(b,c,g):n.style(b,c,d,g)},b,f?d:void 0,f,null)}})}),n.fn.size=function(){return this.length},n.fn.andSelf=n.fn.addBack,"function"==typeof define&&define.amd&&define("jquery",[],function(){return n});var fd=a.jQuery,gd=a.$;return n.noConflict=function(b){return a.$===n&&(a.$=gd),b&&a.jQuery===n&&(a.jQuery=fd),n},typeof b===L&&(a.jQuery=a.$=n),n});
function impress_arrows()
{
    function do_skip(item, a)
    {
        classes = []
            do {
                item = a(item);
                classes = item.attr('class').split(' ');
            }
        while(classes.indexOf('skip') != -1)
            return item;
    }
    function get_coordinate(what, name)
    {
        var coordinate = what.attr('data-' + name);
        if(coordinate == undefined) coordinate = '0';
        return parseInt(coordinate);
    }
    function get_coordinates(i)
    {
        next = do_skip($(i), function(a) { return a.next() });
        prev = do_skip($(i), function(a) { return a.prev() });
        xb = get_coordinate(next, 'x');
        xa = get_coordinate(prev, 'x');
        yb = get_coordinate(next, 'y');
        ya = get_coordinate(prev, 'y');
        dx = xb - xa;
        dy = yb - ya;
        l = Math.sqrt(dy * dy + dx * dx) * 0.4
        x = xa + 0.51 * dx;
        y = ya + 0.51 * dy;
        angle = Math.atan2(yb - ya, xb - xa) * (180 / Math.PI);
        return [l, x, y, 'right', Math.floor(angle)];
    }
    this.init = function() {
        $(".arrow").each(function(i) {
            p = get_coordinates(this);
            classes = this.className.split(' ');
            direction = way = '';
            way = p[3];
            direction = 'horizontal';
            what = 'width';
            if($(this).attr('data-x') == undefined) $(this).attr('data-x', p[1])
            if($(this).attr('data-y') == undefined) $(this).attr('data-y', p[2])
            if($(this).attr('data-rotate') == undefined) $(this).attr('data-rotate', p[4])
            css = {}; css[what] = p[0]
            $(this).addClass('step')
            $(this).addClass('skip')
            $(this).css(css)
            html = ['<div class="arrow-body-common arrow-body-'
            + direction + '"></div>',
        '<div class="arrow-end arrow-' +
            way + '"></div>']
            $(this).html(html.join(""))
        })
        $("#descriptions, #impress").children().each(function() {
            if(!this.className.match(/_description$/)) return;
            id = this.className.split("_description")[0];
            style = document.styleSheets[0]
            len = style.cssRules.length
            style.insertRule('.impress-on-' + id + ' .' + this.className + " { opacity: 1}", len);
        style.insertRule('.impress-enabled .' + this.className + " { display: block}", len);
        style.insertRule('.' + this.className + " { opacity: 0}", len);
        $(this).addClass('description')
        })
    }
    this.load_images = function() {
var impress_arrow_i = 0;
$("img").each(
            function(img)
            {
            if(this.src.match(/^arrow:\/\//))
            {
            var page = this.src.split("arrow://")[1]
            var id = 'impress_arrow_' + impress_arrow_i
            var item = $(this).replaceWith('<iframe src=' + page +
                ' width=' + this. width + ' height='
                + this.height + ' frameBorder=0 '+
                'id=' + id + ' ></iframe>');
            impress_arrow_i += 1
            iframe = $('#' + id);
                iframe.after('<br/>' + 
'<a href='+ page + '>view ' + this.title + '</a>')
            }
            });
return this;
    }
    return this;
}
/**
 * impress.js
 *
 * impress.js is a presentation tool based on the power of CSS3 transforms and transitions
 * in modern browsers and inspired by the idea behind prezi.com.
 *
 *
 * Copyright 2011-2012 Bartek Szopka (@bartaz)
 *
 * Released under the MIT and GPL Licenses.
 *
 * ------------------------------------------------
 *  author:  Bartek Szopka
 *  version: 0.5.3
 *  url:     http://bartaz.github.com/impress.js/
 *  source:  http://github.com/bartaz/impress.js/
 */

/*jshint bitwise:true, curly:true, eqeqeq:true, forin:true, latedef:true, newcap:true,
         noarg:true, noempty:true, undef:true, strict:true, browser:true */

// You are one of those who like to know how thing work inside?
// Let me show you the cogs that make impress.js run...
(function ( document, window ) {
    'use strict';
    
    // HELPER FUNCTIONS
    
    // `pfx` is a function that takes a standard CSS property name as a parameter
    // and returns it's prefixed version valid for current browser it runs in.
    // The code is heavily inspired by Modernizr http://www.modernizr.com/
    var pfx = (function () {
        
        var style = document.createElement('dummy').style,
            prefixes = 'Webkit Moz O ms Khtml'.split(' '),
            memory = {};
        
        return function ( prop ) {
            if ( typeof memory[ prop ] === "undefined" ) {
                
                var ucProp  = prop.charAt(0).toUpperCase() + prop.substr(1),
                    props   = (prop + ' ' + prefixes.join(ucProp + ' ') + ucProp).split(' ');
                
                memory[ prop ] = null;
                for ( var i in props ) {
                    if ( style[ props[i] ] !== undefined ) {
                        memory[ prop ] = props[i];
                        break;
                    }
                }
            
            }
            
            return memory[ prop ];
        };
    
    })();
    
    // `arraify` takes an array-like object and turns it into real Array
    // to make all the Array.prototype goodness available.
    var arrayify = function ( a ) {
        return [].slice.call( a );
    };
    
    // `css` function applies the styles given in `props` object to the element
    // given as `el`. It runs all property names through `pfx` function to make
    // sure proper prefixed version of the property is used.
    var css = function ( el, props ) {
        var key, pkey;
        for ( key in props ) {
            if ( props.hasOwnProperty(key) ) {
                pkey = pfx(key);
                if ( pkey !== null ) {
                    el.style[pkey] = props[key];
                }
            }
        }
        return el;
    };
    
    // `toNumber` takes a value given as `numeric` parameter and tries to turn
    // it into a number. If it is not possible it returns 0 (or other value
    // given as `fallback`).
    var toNumber = function (numeric, fallback) {
        return isNaN(numeric) ? (fallback || 0) : Number(numeric);
    };
    
    // `byId` returns element with given `id` - you probably have guessed that ;)
    var byId = function ( id ) {
        return document.getElementById(id);
    };
    
    // `$` returns first element for given CSS `selector` in the `context` of
    // the given element or whole document.
    var $ = function ( selector, context ) {
        context = context || document;
        return context.querySelector(selector);
    };
    
    // `$$` return an array of elements for given CSS `selector` in the `context` of
    // the given element or whole document.
    var $$ = function ( selector, context ) {
        context = context || document;
        return arrayify( context.querySelectorAll(selector) );
    };
    
    // `triggerEvent` builds a custom DOM event with given `eventName` and `detail` data
    // and triggers it on element given as `el`.
    var triggerEvent = function (el, eventName, detail) {
        var event = document.createEvent("CustomEvent");
        event.initCustomEvent(eventName, true, true, detail);
        el.dispatchEvent(event);
    };
    
    // `translate` builds a translate transform string for given data.
    var translate = function ( t ) {
        return " translate3d(" + t.x + "px," + t.y + "px," + t.z + "px) ";
    };
    
    // `rotate` builds a rotate transform string for given data.
    // By default the rotations are in X Y Z order that can be reverted by passing `true`
    // as second parameter.
    var rotate = function ( r, revert ) {
        var rX = " rotateX(" + r.x + "deg) ",
            rY = " rotateY(" + r.y + "deg) ",
            rZ = " rotateZ(" + r.z + "deg) ";
        
        return revert ? rZ+rY+rX : rX+rY+rZ;
    };
    
    // `scale` builds a scale transform string for given data.
    var scale = function ( s ) {
        return " scale(" + s + ") ";
    };
    
    // `perspective` builds a perspective transform string for given data.
    var perspective = function ( p ) {
        return " perspective(" + p + "px) ";
    };
    
    // `getElementFromHash` returns an element located by id from hash part of
    // window location.
    var getElementFromHash = function () {
        // get id from url # by removing `#` or `#/` from the beginning,
        // so both "fallback" `#slide-id` and "enhanced" `#/slide-id` will work
        return byId( window.location.hash.replace(/^#\/?/,"") );
    };
    
    // `computeWindowScale` counts the scale factor between window size and size
    // defined for the presentation in the config.
    var computeWindowScale = function ( config ) {
        var hScale = window.innerHeight / config.height,
            wScale = window.innerWidth / config.width,
            scale = hScale > wScale ? wScale : hScale;
        
        if (config.maxScale && scale > config.maxScale) {
            scale = config.maxScale;
        }
        
        if (config.minScale && scale < config.minScale) {
            scale = config.minScale;
        }
        
        return scale;
    };
    
    // CHECK SUPPORT
    var body = document.body;
    
    var ua = navigator.userAgent.toLowerCase();
    var impressSupported = 
                          // browser should support CSS 3D transtorms 
                           ( pfx("perspective") !== null ) &&
                           
                          // and `classList` and `dataset` APIs
                           ( body.classList ) &&
                           ( body.dataset ) &&
                           
                          // but some mobile devices need to be blacklisted,
                          // because their CSS 3D support or hardware is not
                          // good enough to run impress.js properly, sorry...
                           ( ua.search(/(iphone)|(ipod)|(android)/) === -1 );
    
    if (!impressSupported) {
        // we can't be sure that `classList` is supported
        body.className += " impress-not-supported ";
    } else {
        body.classList.remove("impress-not-supported");
        body.classList.add("impress-supported");
    }
    
    // GLOBALS AND DEFAULTS
    
    // This is were the root elements of all impress.js instances will be kept.
    // Yes, this means you can have more than one instance on a page, but I'm not
    // sure if it makes any sense in practice ;)
    var roots = {};
    
    // some default config values.
    var defaults = {
        width: 1024,
        height: 768,
        maxScale: 1,
        minScale: 0,
        
        perspective: 1000,
        
        transitionDuration: 1000
    };
    
    // it's just an empty function ... and a useless comment.
    var empty = function () { return false; };
    
    // IMPRESS.JS API
    
    // And that's where interesting things will start to happen.
    // It's the core `impress` function that returns the impress.js API
    // for a presentation based on the element with given id ('impress'
    // by default).
    var impress = window.impress = function ( rootId ) {
        
        // If impress.js is not supported by the browser return a dummy API
        // it may not be a perfect solution but we return early and avoid
        // running code that may use features not implemented in the browser.
        if (!impressSupported) {
            return {
                init: empty,
                goto: empty,
                prev: empty,
                next: empty
            };
        }
        
        rootId = rootId || "impress";
        
        // if given root is already initialized just return the API
        if (roots["impress-root-" + rootId]) {
            return roots["impress-root-" + rootId];
        }
        
        // data of all presentation steps
        var stepsData = {};
        
        // element of currently active step
        var activeStep = null;
        
        // current state (position, rotation and scale) of the presentation
        var currentState = null;
        
        // array of step elements
        var steps = null;
        
        // configuration options
        var config = null;
        
        // scale factor of the browser window
        var windowScale = null;        
        
        // root presentation elements
        var root = byId( rootId );
        var canvas = document.createElement("div");
        
        var initialized = false;
        
        // STEP EVENTS
        //
        // There are currently two step events triggered by impress.js
        // `impress:stepenter` is triggered when the step is shown on the 
        // screen (the transition from the previous one is finished) and
        // `impress:stepleave` is triggered when the step is left (the
        // transition to next step just starts).
        
        // reference to last entered step
        var lastEntered = null;
        
        // `onStepEnter` is called whenever the step element is entered
        // but the event is triggered only if the step is different than
        // last entered step.
        var onStepEnter = function (step) {
            if (lastEntered !== step) {
                triggerEvent(step, "impress:stepenter");
                lastEntered = step;
            }
        };
        
        // `onStepLeave` is called whenever the step element is left
        // but the event is triggered only if the step is the same as
        // last entered step.
        var onStepLeave = function (step) {
            if (lastEntered === step) {
                triggerEvent(step, "impress:stepleave");
                lastEntered = null;
            }
        };
        
        // `initStep` initializes given step element by reading data from its
        // data attributes and setting correct styles.
        var initStep = function ( el, idx ) {
            var data = el.dataset,
                step = {
                    translate: {
                        x: toNumber(data.x),
                        y: toNumber(data.y),
                        z: toNumber(data.z)
                    },
                    rotate: {
                        x: toNumber(data.rotateX),
                        y: toNumber(data.rotateY),
                        z: toNumber(data.rotateZ || data.rotate)
                    },
                    scale: toNumber(data.scale, 1),
                    el: el
                };
            
            if ( !el.id ) {
                el.id = "step-" + (idx + 1);
            }
            
            stepsData["impress-" + el.id] = step;
            
            css(el, {
                position: "absolute",
                transform: "translate(-50%,-50%)" +
                           translate(step.translate) +
                           rotate(step.rotate) +
                           scale(step.scale),
                transformStyle: "preserve-3d"
            });
        };
        
        // `init` API function that initializes (and runs) the presentation.
        var init = function () {
            if (initialized) { return; }
            
            // First we set up the viewport for mobile devices.
            // For some reason iPad goes nuts when it is not done properly.
            var meta = $("meta[name='viewport']") || document.createElement("meta");
            meta.content = "width=device-width, minimum-scale=1, maximum-scale=1, user-scalable=no";
            if (meta.parentNode !== document.head) {
                meta.name = 'viewport';
                document.head.appendChild(meta);
            }
            
            // initialize configuration object
            var rootData = root.dataset;
            config = {
                width: toNumber( rootData.width, defaults.width ),
                height: toNumber( rootData.height, defaults.height ),
                maxScale: toNumber( rootData.maxScale, defaults.maxScale ),
                minScale: toNumber( rootData.minScale, defaults.minScale ),                
                perspective: toNumber( rootData.perspective, defaults.perspective ),
                transitionDuration: toNumber( rootData.transitionDuration, defaults.transitionDuration )
            };
            
            windowScale = computeWindowScale( config );
            
            // wrap steps with "canvas" element
            arrayify( root.childNodes ).forEach(function ( el ) {
                canvas.appendChild( el );
            });
            root.appendChild(canvas);
            
            // set initial styles
            document.documentElement.style.height = "100%";
            
            css(body, {
                height: "100%",
                overflow: "hidden"
            });
            
            var rootStyles = {
                position: "absolute",
                transformOrigin: "top left",
                transition: "all 0s ease-in-out",
                transformStyle: "preserve-3d"
            };
            
            css(root, rootStyles);
            css(root, {
                top: "50%",
                left: "50%",
                transform: perspective( config.perspective/windowScale ) + scale( windowScale )
            });
            css(canvas, rootStyles);
            
            body.classList.remove("impress-disabled");
            body.classList.add("impress-enabled");
            
            // get and init steps
            steps = $$(".step", root);
            steps.forEach( initStep );
            
            // set a default initial state of the canvas
            currentState = {
                translate: { x: 0, y: 0, z: 0 },
                rotate:    { x: 0, y: 0, z: 0 },
                scale:     1
            };
            
            initialized = true;
            
            triggerEvent(root, "impress:init", { api: roots[ "impress-root-" + rootId ] });
        };
        
        // `getStep` is a helper function that returns a step element defined by parameter.
        // If a number is given, step with index given by the number is returned, if a string
        // is given step element with such id is returned, if DOM element is given it is returned
        // if it is a correct step element.
        var getStep = function ( step ) {
            if (typeof step === "number") {
                step = step < 0 ? steps[ steps.length + step] : steps[ step ];
            } else if (typeof step === "string") {
                step = byId(step);
            }
            return (step && step.id && stepsData["impress-" + step.id]) ? step : null;
        };
        
        // used to reset timeout for `impress:stepenter` event
        var stepEnterTimeout = null;
        
        // `goto` API function that moves to step given with `el` parameter (by index, id or element),
        // with a transition `duration` optionally given as second parameter.
        var goto = function ( el, duration ) {
            
            if ( !initialized || !(el = getStep(el)) ) {
                // presentation not initialized or given element is not a step
                return false;
            }
            
            if ( el.classList.contains("skip") ) {
                var skippedOffset = steps.indexOf(activeStep) > steps.indexOf(el) ? -1 : 1;
                var skipped = steps.indexOf(el) + skippedOffset;
                skipped = skipped < steps.length ? steps[skipped] : steps[0];
                goto(skipped);
                return false;
            }
            // Sometimes it's possible to trigger focus on first link with some keyboard action.
            // Browser in such a case tries to scroll the page to make this element visible
            // (even that body overflow is set to hidden) and it breaks our careful positioning.
            //
            // So, as a lousy (and lazy) workaround we will make the page scroll back to the top
            // whenever slide is selected
            //
            // If you are reading this and know any better way to handle it, I'll be glad to hear about it!
            window.scrollTo(0, 0);
            
            var step = stepsData["impress-" + el.id];
            
            if ( activeStep ) {
                activeStep.classList.remove("active");
                body.classList.remove("impress-on-" + activeStep.id);
            }
            el.classList.add("active");
            
            body.classList.add("impress-on-" + el.id);
            
            // compute target state of the canvas based on given step
            var target = {
                rotate: {
                    x: -step.rotate.x,
                    y: -step.rotate.y,
                    z: -step.rotate.z
                },
                translate: {
                    x: -step.translate.x,
                    y: -step.translate.y,
                    z: -step.translate.z
                },
                scale: 1 / step.scale
            };
            
            // Check if the transition is zooming in or not.
            //
            // This information is used to alter the transition style:
            // when we are zooming in - we start with move and rotate transition
            // and the scaling is delayed, but when we are zooming out we start
            // with scaling down and move and rotation are delayed.
            var zoomin = target.scale >= currentState.scale;
            
            duration = toNumber(duration, config.transitionDuration);
            var delay = (duration / 2);
            
            // if the same step is re-selected, force computing window scaling,
            // because it is likely to be caused by window resize
            if (el === activeStep) {
                windowScale = computeWindowScale(config);
            }
            
            var targetScale = target.scale * windowScale;
            
            // trigger leave of currently active element (if it's not the same step again)
            if (activeStep && activeStep !== el) {
                onStepLeave(activeStep);
            }
            
            // Now we alter transforms of `root` and `canvas` to trigger transitions.
            //
            // And here is why there are two elements: `root` and `canvas` - they are
            // being animated separately:
            // `root` is used for scaling and `canvas` for translate and rotations.
            // Transitions on them are triggered with different delays (to make
            // visually nice and 'natural' looking transitions), so we need to know
            // that both of them are finished.
            css(root, {
                // to keep the perspective look similar for different scales
                // we need to 'scale' the perspective, too
                transform: perspective( config.perspective / targetScale ) + scale( targetScale ),
                transitionDuration: duration + "ms",
                transitionDelay: (zoomin ? delay : 0) + "ms"
            });
            
            css(canvas, {
                transform: rotate(target.rotate, true) + translate(target.translate),
                transitionDuration: duration + "ms",
                transitionDelay: (zoomin ? 0 : delay) + "ms"
            });
            
            // Here is a tricky part...
            //
            // If there is no change in scale or no change in rotation and translation, it means there was actually
            // no delay - because there was no transition on `root` or `canvas` elements.
            // We want to trigger `impress:stepenter` event in the correct moment, so here we compare the current
            // and target values to check if delay should be taken into account.
            //
            // I know that this `if` statement looks scary, but it's pretty simple when you know what is going on
            // - it's simply comparing all the values.
            if ( currentState.scale === target.scale ||
                (currentState.rotate.x === target.rotate.x && currentState.rotate.y === target.rotate.y &&
                 currentState.rotate.z === target.rotate.z && currentState.translate.x === target.translate.x &&
                 currentState.translate.y === target.translate.y && currentState.translate.z === target.translate.z) ) {
                delay = 0;
            }
            
            // store current state
            currentState = target;
            activeStep = el;
            
            // And here is where we trigger `impress:stepenter` event.
            // We simply set up a timeout to fire it taking transition duration (and possible delay) into account.
            //
            // I really wanted to make it in more elegant way. The `transitionend` event seemed to be the best way
            // to do it, but the fact that I'm using transitions on two separate elements and that the `transitionend`
            // event is only triggered when there was a transition (change in the values) caused some bugs and 
            // made the code really complicated, cause I had to handle all the conditions separately. And it still
            // needed a `setTimeout` fallback for the situations when there is no transition at all.
            // So I decided that I'd rather make the code simpler than use shiny new `transitionend`.
            //
            // If you want learn something interesting and see how it was done with `transitionend` go back to
            // version 0.5.2 of impress.js: http://github.com/bartaz/impress.js/blob/0.5.2/js/impress.js
            window.clearTimeout(stepEnterTimeout);
            stepEnterTimeout = window.setTimeout(function() {
                onStepEnter(activeStep);
            }, duration + delay);
            
            return el;
        };
        
        // `prev` API function goes to previous step (in document order)
        var prev = function () {
            var prev = steps.indexOf( activeStep ) - 1;
            prev = prev >= 0 ? steps[ prev ] : steps[ steps.length-1 ];
            
            return goto(prev);
        };
        
        // `next` API function goes to next step (in document order)
        var next = function () {
            var next = steps.indexOf( activeStep ) + 1;
            next = next < steps.length ? steps[ next ] : steps[ 0 ];
            
            return goto(next);
        };
        
        // Adding some useful classes to step elements.
        //
        // All the steps that have not been shown yet are given `future` class.
        // When the step is entered the `future` class is removed and the `present`
        // class is given. When the step is left `present` class is replaced with
        // `past` class.
        //
        // So every step element is always in one of three possible states:
        // `future`, `present` and `past`.
        //
        // There classes can be used in CSS to style different types of steps.
        // For example the `present` class can be used to trigger some custom
        // animations when step is shown.
        root.addEventListener("impress:init", function(){
            // STEP CLASSES
            steps.forEach(function (step) {
                step.classList.add("future");
            });
            
            root.addEventListener("impress:stepenter", function (event) {
                event.target.classList.remove("past");
                event.target.classList.remove("future");
                event.target.classList.add("present");
            }, false);
            
            root.addEventListener("impress:stepleave", function (event) {
                event.target.classList.remove("present");
                event.target.classList.add("past");
            }, false);
            
        }, false);
        
        // Adding hash change support.
        root.addEventListener("impress:init", function(){
            
            // last hash detected
            var lastHash = "";
            
            // `#/step-id` is used instead of `#step-id` to prevent default browser
            // scrolling to element in hash.
            //
            // And it has to be set after animation finishes, because in Chrome it
            // makes transtion laggy.
            // BUG: http://code.google.com/p/chromium/issues/detail?id=62820
            root.addEventListener("impress:stepenter", function (event) {
                window.location.hash = lastHash = "#/" + event.target.id;
            }, false);
            
            window.addEventListener("hashchange", function () {
                // When the step is entered hash in the location is updated
                // (just few lines above from here), so the hash change is 
                // triggered and we would call `goto` again on the same element.
                //
                // To avoid this we store last entered hash and compare.
                if (window.location.hash !== lastHash) {
                    goto( getElementFromHash() );
                }
            }, false);
            
            // START 
            // by selecting step defined in url or first step of the presentation
            goto(getElementFromHash() || steps[0], 0);
        }, false);
        
        body.classList.add("impress-disabled");
        
        // store and return API for given impress.js root element
        return (roots[ "impress-root-" + rootId ] = {
            init: init,
            goto: goto,
            next: next,
            prev: prev
        });

    };
    
    // flag that can be used in JS to check if browser have passed the support test
    impress.supported = impressSupported;
    
})(document, window);

// NAVIGATION EVENTS

// As you can see this part is separate from the impress.js core code.
// It's because these navigation actions only need what impress.js provides with
// its simple API.
//
// In future I think about moving it to make them optional, move to separate files
// and treat more like a 'plugins'.
(function ( document, window ) {
    'use strict';
    
    // throttling function calls, by Remy Sharp
    // http://remysharp.com/2010/07/21/throttling-function-calls/
    var throttle = function (fn, delay) {
        var timer = null;
        return function () {
            var context = this, args = arguments;
            clearTimeout(timer);
            timer = setTimeout(function () {
                fn.apply(context, args);
            }, delay);
        };
    };
    
    // wait for impress.js to be initialized
    document.addEventListener("impress:init", function (event) {
        // Getting API from event data.
        // So you don't event need to know what is the id of the root element
        // or anything. `impress:init` event data gives you everything you 
        // need to control the presentation that was just initialized.
        var api = event.detail.api;
        
        // KEYBOARD NAVIGATION HANDLERS
        
        // Prevent default keydown action when one of supported key is pressed.
        document.addEventListener("keydown", function ( event ) {
            if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) {
                event.preventDefault();
            }
        }, false);
        
        // Trigger impress action (next or prev) on keyup.
        
        // Supported keys are:
        // [space] - quite common in presentation software to move forward
        // [up] [right] / [down] [left] - again common and natural addition,
        // [pgdown] / [pgup] - often triggered by remote controllers,
        // [tab] - this one is quite controversial, but the reason it ended up on
        //   this list is quite an interesting story... Remember that strange part
        //   in the impress.js code where window is scrolled to 0,0 on every presentation
        //   step, because sometimes browser scrolls viewport because of the focused element?
        //   Well, the [tab] key by default navigates around focusable elements, so clicking
        //   it very often caused scrolling to focused element and breaking impress.js
        //   positioning. I didn't want to just prevent this default action, so I used [tab]
        //   as another way to moving to next step... And yes, I know that for the sake of
        //   consistency I should add [shift+tab] as opposite action...
        document.addEventListener("keyup", function ( event ) {
            if ( event.keyCode === 9 || ( event.keyCode >= 32 && event.keyCode <= 34 ) || (event.keyCode >= 37 && event.keyCode <= 40) ) {
                switch( event.keyCode ) {
                    case 33: // pg up
                    case 37: // left
                    case 38: // up
                             api.prev();
                             break;
                    case 9:  // tab
                    case 32: // space
                    case 34: // pg down
                    case 39: // right
                    case 40: // down
                             api.next();
                             break;
                }
                
                event.preventDefault();
            }
        }, false);
        
        // delegated handler for clicking on the links to presentation steps
        document.addEventListener("click", function ( event ) {
            // event delegation with "bubbling"
            // check if event target (or any of its parents is a link)
            var target = event.target;
            while ( (target.tagName !== "A") &&
                    (target !== document.documentElement) ) {
                target = target.parentNode;
            }
            
            if ( target.tagName === "A" ) {
                var href = target.getAttribute("href");
                
                // if it's a link to presentation step, target this step
                if ( href && href[0] === '#' ) {
                    target = document.getElementById( href.slice(1) );
                }
            }
            
            if ( api.goto(target) ) {
                event.stopImmediatePropagation();
                event.preventDefault();
            }
        }, false);
        
        // delegated handler for clicking on step elements
        document.addEventListener("click", function ( event ) {
            var target = event.target;
            // find closest step element that is not active
            while ( !(target.classList.contains("step") && !target.classList.contains("active")) &&
                    (target !== document.documentElement) ) {
                target = target.parentNode;
            }
            
            if ( api.goto(target) ) {
                event.preventDefault();
            }
        }, false);
        
        // touch handler to detect taps on the left and right side of the screen
        // based on awesome work of @hakimel: https://github.com/hakimel/reveal.js
        document.addEventListener("touchstart", function ( event ) {
            if (event.touches.length === 1) {
                var x = event.touches[0].clientX,
                    width = window.innerWidth * 0.3,
                    result = null;
                    
                if ( x < width ) {
                    result = api.prev();
                } else if ( x > window.innerWidth - width ) {
                    result = api.next();
                }
                
                if (result) {
                    event.preventDefault();
                }
            }
        }, false);
        
        // rescale presentation when window is resized
        window.addEventListener("resize", throttle(function () {
            // force going to active step again, to trigger rescaling
            api.goto( document.querySelector(".active"), 500 );
        }, 250), false);
        
    }, false);
        
})(document, window);

// THAT'S ALL FOLKS!
//
// Thanks for reading it all.
// Or thanks for scrolling down and reading the last part.
//
// I've learnt a lot when building impress.js and I hope this code and comments
// will help somebody learn at least some part of it.
$("head").append("<style>"
+'body {\
    font-family: "PT Sans", sans-serif;\
    min-height: 740px;\
\
    background: rgb(215, 215, 215);\
    background: -webkit-gradient(radial, 50% 50%, 0, 50% 50%, 500, from(rgb(240, 240, 240)), to(rgb(190, 190, 190)));\
    background: -webkit-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));\
    background: -moz-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));\
    background: -ms-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));\
    background: -o-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));\
    background: radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));\
}\
.title {\
    color: rgb(102, 102, 102);\
    font-size: 120px;\
    text-shadow: 0 2px 2px rgba(0, 0, 0, .1);\
    font-family: "Open Sans", Arial, sans-serif;\
}\
.box {\
    background-color: white;\
    border: 1px solid rgba(0, 0, 0, .3);\
    border-radius: 10px;\
    box-shadow: 0 2px 6px rgba(0, 0, 0, .1);\
    color: rgb(102, 102, 102);\
    text-shadow: 0 2px 2px rgba(0, 0, 0, .1);\
    font-family: "Open Sans", Arial, sans-serif;\
    font-size: 60px;\
    line-height: 50px;\
    letter-spacing: -1px;\
    padding: 40px 60px;\
    margin: 20px;\
    text-align: center;\
    position: relative;\
}\
.green {\
    background-color: #daf6bf;\
}\
.salmon {\
    background-color: #ffdbb6;\
}\
.blue {\
    background-color: #d5ebff;\
}\
.yellow {\
    background-color: #f7ff7f;\
}\
.arrow.future {\
    opacity: 1;\
}\
.present {\
    opacity: 1;\
    transition: opacity .1s ease-in-out;\
    -moz-transition: opacity .1s ease-in-out;\
    -webkit-transition: opacity .1s ease-in-out;\
}\
.past {\
    opacity: 1;\
}\
.comment.future {\
    opacity: 0;\
}\
.comment.present {\
    opacity: 1;\
}\
.comment.past {\
    opacity: 0;\
}\
.description {\
    display: none;\
    position: fixed;\
    left: 0;\
    right: 0;\
    width: 50%;\
    border-radius: 10px;\
    background: rgba(0,0,0,0.5);\
    color: #EEE;\
    font-size: 20px;\
    padding: 20px;\
    z-index: 100;\
}\
.arrow-body-common {\
    position: relative;\
    background-color: black;\
    float: left;\
}\
.arrow-body-horizontal {\
    width: 90%;\
    height: 10px;\
    top: 14px;\
}\
.arrow-end {\
    width: 0; \
    height: 0; \
    position: relative;\
    left: -1px;\
    float: left;\
}\
.arrow-right {\
    border-bottom: 20px solid transparent;\
    border-top: 20px solid transparent;\
    border-left: 20px solid black;\
}\
' + "<style>")
impress_arrows().init();
impress().init();