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/*
* Project: Scrolly2 - Background Image Parallax
* Originally based on Scrolly by Victor C. / Octave & Octave web agency
* Rewritten and heavily adjusted by Benjamin Intal / Gambit
*/
(function ( $, window, document, undefined ) {
var pluginName = 'scrolly2';
function Plugin( element, options ) {
this.$element = $(element);
this.init();
}
Plugin.prototype.init = function () {
// Declare vars
var self = this;
this.startPosition = 0;
this.offsetTop = this.$element.offset().top;
this.height = this.$element.outerHeight(true);
this.velocity = this.$element.attr('data-velocity');
this.direction = this.$element.attr('data-direction');
// Bind so that we don't refresh everytime
$(window).bind('scroll', function() {
self.scrolly2();
});
};
Plugin.prototype.scrolly2 = function() {
// Check if the element is inside our viewport, if it's not, don't do anything
var viewTop = $(window).scrollTop() - 20; // with leeway
var viewBottom = $(window).scrollTop() + $(window).height() + 20; // with leeway
var elemTop = this.$element.offset().top;
var elemBottom = this.$element.offset().top + this.$element.height();
if ( elemTop >= viewBottom || elemBottom <= viewTop ) {
return;
}
// If the element is below the fold, then we need to
// make sure that when we first see the element,
// our background image should be in the starting position
if ( this.$element.offset().top > $(window).height() ) {
if ( this.direction !== 'none' ) {
this.startPosition = (this.$element.offset().top - $(window).height()) * Math.abs(this.velocity);
}
}
// Calculate position
var position = this.startPosition + $(window).scrollTop() * this.velocity;
// Adjust position
var xPos = "50%";
var yPos = "50%";
if ( this.direction === 'left' ) {
xPos = position + 'px';
} else if ( this.direction === 'right' ) {
xPos = 'calc(100% + ' + -position + 'px)';
} else if ( this.direction === 'down' ) {
// yPos = 'calc(100% + ' + (-position) + 'px)';
// Use this one for background-attachment: fixed
var offset = - ( $(window).height() -
this.$element.offset().top -
this.$element.height() -
parseInt( this.$element.css('paddingTop') ) -
parseInt( this.$element.css('paddingBottom') ) );
yPos = 'calc(100% + ' + ( offset - $(window).scrollTop() - position ) + 'px)';
} else { // up
// yPos = position + 'px';
// Use this one for background-attachment: fixed
yPos = ( this.$element.offset().top - $(window).scrollTop() + position ) + 'px';
}
this.$element.css( { backgroundPosition: xPos + ' ' + yPos } );
};
$.fn[pluginName] = function ( options ) {
return this.each(function () {
if (!$.data(this, 'plugin_' + pluginName)) {
$.data(this, 'plugin_' + pluginName, new Plugin( this, options ));
}
});
};
})(jQuery, window, document);