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Diffstat (limited to 'presentation/plugin/zoom-js')
| -rw-r--r-- | presentation/plugin/zoom-js/zoom.js | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/presentation/plugin/zoom-js/zoom.js b/presentation/plugin/zoom-js/zoom.js new file mode 100644 index 0000000..3059b38 --- /dev/null +++ b/presentation/plugin/zoom-js/zoom.js @@ -0,0 +1,278 @@ +// Custom reveal.js integration +var RevealZoom = (function () { + + return { + init: function () { + + Reveal.getRevealElement().addEventListener('mousedown', function (event) { + var defaultModifier = /Linux/.test(window.navigator.platform) ? 'ctrl' : 'alt'; + + var modifier = (Reveal.getConfig().zoomKey ? Reveal.getConfig().zoomKey : defaultModifier) + 'Key'; + var zoomLevel = (Reveal.getConfig().zoomLevel ? Reveal.getConfig().zoomLevel : 2); + + if (event[modifier] && !Reveal.isOverview()) { + event.preventDefault(); + + zoom.to({ + x: event.clientX, + y: event.clientY, + scale: zoomLevel, + pan: false + }); + } + }); + + } + } + +})(); + +Reveal.registerPlugin('zoom', RevealZoom); + +/*! + * 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; + } + } + +})(); |