Carica file su 'plugin/zoom-js'
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plugin/zoom-js/zoom.js
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272
plugin/zoom-js/zoom.js
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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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revealElement.addEventListener( 'mousedown', function( event ) {
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var defaultModifier = /Linux/.test( window.navigator.platform ) ? 'ctrl' : 'alt';
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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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if( event[ modifier ] && !Reveal.isOverview() ) {
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event.preventDefault();
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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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* 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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// The current zoom level (scale)
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var level = 1;
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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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// Timeout before pan is activated
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var panEngageTimeout = -1,
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panUpdateInterval = -1;
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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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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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// 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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// 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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* 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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var scrollOffset = getScrollOffset();
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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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// 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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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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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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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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level = scale;
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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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* 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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// 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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// 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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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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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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// 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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// 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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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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// 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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if( options.scale > 1 ) {
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options.x *= options.scale;
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options.y *= options.scale;
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magnify( options, options.scale );
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if( options.pan !== false ) {
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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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* 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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magnify( { x: 0, y: 0 }, 1 );
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level = 1;
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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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zoomLevel: function() {
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return level;
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}
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}
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})();
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