244 lines
7.2 KiB
JavaScript
244 lines
7.2 KiB
JavaScript
// Custom reveal.js integration
|
|
(function(){
|
|
document.querySelector( '.reveal' ).addEventListener( 'click', function( event ) {
|
|
if( event.altKey ) {
|
|
event.preventDefault();
|
|
zoom.to({ element: event.target, pan: false });
|
|
}
|
|
} );
|
|
})();
|
|
|
|
/*!
|
|
* zoom.js 0.2 (modified version for use with reveal.js)
|
|
* http://lab.hakim.se/zoom-js
|
|
* MIT licensed
|
|
*
|
|
* Copyright (C) 2011-2012 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;
|
|
|
|
var currentOptions = null;
|
|
|
|
// 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();
|
|
}
|
|
}, false );
|
|
|
|
// Monitor mouse movement for panning
|
|
document.addEventListener( 'mousemove', function( event ) {
|
|
if( level !== 1 ) {
|
|
mouseX = event.clientX;
|
|
mouseY = event.clientY;
|
|
}
|
|
}, false );
|
|
|
|
/**
|
|
* Applies the CSS required to zoom in, prioritizes use of CSS3
|
|
* transforms but falls back on zoom for IE.
|
|
*
|
|
* @param {Number} pageOffsetX
|
|
* @param {Number} pageOffsetY
|
|
* @param {Number} elementOffsetX
|
|
* @param {Number} elementOffsetY
|
|
* @param {Number} scale
|
|
*/
|
|
function magnify( pageOffsetX, pageOffsetY, elementOffsetX, elementOffsetY, scale ) {
|
|
|
|
if( supportsTransforms ) {
|
|
var origin = pageOffsetX +'px '+ pageOffsetY +'px',
|
|
transform = 'translate('+ -elementOffsetX +'px,'+ -elementOffsetY +'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 all values
|
|
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 = '';
|
|
}
|
|
// Apply scale
|
|
else {
|
|
document.body.style.position = 'relative';
|
|
document.body.style.left = ( - ( pageOffsetX + elementOffsetX ) / scale ) + 'px';
|
|
document.body.style.top = ( - ( pageOffsetY + elementOffsetY ) / scale ) + 'px';
|
|
document.body.style.width = ( scale * 100 ) + '%';
|
|
document.body.style.height = ( scale * 100 ) + '%';
|
|
document.body.style.zoom = scale;
|
|
}
|
|
}
|
|
|
|
level = scale;
|
|
}
|
|
|
|
/**
|
|
* 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.pageXYffset
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
options.width = options.element.getBoundingClientRect().width + ( padding * 2 );
|
|
options.height = options.element.getBoundingClientRect().height + ( padding * 2 );
|
|
options.x = options.element.getBoundingClientRect().left - padding;
|
|
options.y = options.element.getBoundingClientRect().top - padding;
|
|
}
|
|
|
|
// 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;
|
|
|
|
var scrollOffset = getScrollOffset();
|
|
|
|
if( options.element ) {
|
|
scrollOffset.x -= ( window.innerWidth - ( options.width * options.scale ) ) / 2;
|
|
}
|
|
|
|
magnify( scrollOffset.x, scrollOffset.y, options.x, options.y, 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 );
|
|
|
|
}
|
|
}
|
|
|
|
currentOptions = options;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Resets the document zoom state to its default.
|
|
*/
|
|
out: function() {
|
|
clearTimeout( panEngageTimeout );
|
|
clearInterval( panUpdateInterval );
|
|
|
|
var scrollOffset = getScrollOffset();
|
|
|
|
if( currentOptions && currentOptions.element ) {
|
|
scrollOffset.x -= ( window.innerWidth - ( currentOptions.width * currentOptions.scale ) ) / 2;
|
|
}
|
|
|
|
magnify( scrollOffset.x, scrollOffset.y, 0, 0, 1 );
|
|
|
|
level = 1;
|
|
},
|
|
|
|
// Alias
|
|
magnify: function( options ) { this.to( options ) },
|
|
reset: function() { this.out() },
|
|
|
|
zoomLevel: function() {
|
|
return level;
|
|
}
|
|
}
|
|
|
|
})();
|
|
|