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// Anm © 2014-2015 Andrey Polischuk
// github.com/andrepolischuk/anm
! function () {
'use strict';
/**
* Object classes
*/
// ClimaxThemes
var elementClass = '.kata-mouse-parallax';
/**
* Base options undefined
*/
if (!elementClass) {
return;
}
/**
* IE lt 9 detection
*/
var msie = /MSIE.\d+\./gi.test(navigator.userAgent) &&
+navigator.userAgent.replace(/.*MSIE.(\d+)\..*/gi, "$1") < 9;
/**
* Event name
*/
var eventName = 'ontouchstart' in window ||
'onmsgesturechange' in window ? 'touchmove' : 'mousemove';
/**
* Pause flag
*/
var pause;
/**
* Effects
*/
var effects = [
'x',
'y',
'scale',
'opacity',
'rotate'
];
/**
* Transform map
*/
var transformMap = {
'webkitTransform': 'translate3d',
'MozTransform': 'translate3d',
'msTransform': 'translate3d',
'OTransform': 'translate',
'transform': 'translate3d'
};
/**
* Anm
* @api public
*/
function anm() {
}
/**
* Elements
* @api public
*/
var elements = anm.elements = document.querySelectorAll(elementClass);
/**
* On animation
* @api public
*/
anm.on = function () {
pause = false;
};
/**
* Off animation
* @api public
*/
anm.off = function () {
pause = true;
};
/**
* Toggle animation
* @api public
*/
anm.toggle = function () {
pause = !pause;
};
/**
* Calculate cursor position
* @param {Object} e
* @return {Object}
* @api private
*/
function calculatePosition(e) {
var pos = {};
pos.x = e.clientX - window.innerWidth / 2 || 0;
pos.y = e.clientY - window.innerHeight / 2 || 0;
pos.fi = (Math.atan(pos.x === 0 ? Infinity : -pos.y / pos.x) +
(pos.x < 0 ? Math.PI : (-pos.y < 0 ? 2 * Math.PI : 0)));
pos.s = 45 * Math.sin(2 * pos.fi) / 100;
pos.x /= 100;
pos.y /= 100;
pos.r = Math.sqrt(Math.pow(pos.x, 2) + Math.pow(pos.y, 2)) /
Math.sqrt(Math.pow(window.innerWidth, 2) +
Math.pow(window.innerHeight, 2)) * 2;
return pos;
}
/**
* Calculate element factors
* @param {Object} el
* @return {Object}
* @api private
*/
function calculateFactors(el) {
var fact = {};
for (var i = 0; i < effects.length; i++) {
fact[effects[i]] = +el.getAttribute('data-speed-' + effects[i]) || 0;
}
return fact;
}
/**
* Calculate element transforms
* @param {Object} pos
* @param {Object} fact
* @return {Object}
* @api private
*/
function calculateTransforms(pos, fact) {
var transform = {};
transform.x = pos.x * fact.x + 'px';
transform.y = pos.y * fact.y + 'px';
transform.scale = 1 + (pos.r * fact.scale);
transform.opacity = 1 - (pos.r * Math.abs(fact.opacity));
transform.rotate = -pos.s * pos.r * 100 * fact.rotate + 'deg';
return transform;
}
/**
* Set element transform styles
* @param {Object} el
* @param {Object} transform
* @return {Object}
* @api private
*/
function setElementStyle(el, transform) {
if (msie) {
el.style.marginLeft = transform.x;
el.style.marginTop = transform.y;
} else {
for (var m in transformMap) {
if (transformMap.hasOwnProperty(m)) {
el.style[m] = [
transformMap[m],
'(',
transform.x + ',' + transform.y,
transformMap[m] === 'translate' ? '' : ',0',
') scale(',
transform.scale,
') rotate(',
transform.rotate,
')'
].join('');
}
}
el.style.opacity = transform.opacity;
el.style.MozOpacity = transform.opacity;
}
}
/**
* Set elements positions
* @api private
*/
function position(e) {
if (pause) {
return;
}
e = e.type === 'touchmove' ? e.changedTouches[0] : e;
var fact, transform, pos = calculatePosition(e);
for (var i = 0, el; i < elements.length; i++) {
el = elements[i];
fact = calculateFactors(el);
transform = calculateTransforms(pos, fact);
setElementStyle(el, transform);
}
}
/**
* Set start position
*/
position({});
/**
* Set move event handler
*/
if (window.addEventListener) {
window.addEventListener(eventName, position, false);
} else {
window.attachEvent('onmousemove', function () {
position.call(window, window.event);
});
}
/**
* Module exports
*/
if (typeof define === 'function' && define.amd) {
define([], function () {
return anm;
});
} else if (typeof module !== 'undefined' && module.exports) {
module.exports = anm;
} else {
this.anm = anm;
}
}.call(this);