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function clamp (n,a,b) { return n < a ? a : n < b ? n : b }
function sign (n) { return n < 0 ? -1 : 1 }
function addClassForPeriod(el, className, delay, callback){
delay = delay || 1000
el.classList.add(className)
setTimeout(function(){
el.classList.remove(className)
callback && callback()
}, delay)
}
// Function.bind polyfill
if (!Function.prototype.bind) {
Function.prototype.bind = function(oThis) {
if (typeof this !== 'function') {
// closest thing possible to the ECMAScript 5
// internal IsCallable function
throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
}
var aArgs = Array.prototype.slice.call(arguments, 1),
fToBind = this,
fNOP = function() {},
fBound = function() {
return fToBind.apply(this instanceof fNOP && oThis
? this
: oThis,
aArgs.concat(Array.prototype.slice.call(arguments)));
};
fNOP.prototype = this.prototype;
fBound.prototype = new fNOP();
return fBound;
};
}
// rAF polyfill
(function() {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
|| window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}());
var debounce = (function() {
var timer = 0;
return function(callback, ms) {
clearTimeout(timer);
timer = setTimeout(callback, ms);
}
})()
// Identify browser based on useragent string
var browser = (function( ua ) {
ua = ua.toLowerCase();
var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||
/(webkit)[ \/]([\w.]+)/.exec( ua ) ||
/(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
/(msie) ([\w.]+)/.exec( ua ) ||
ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
[];
var matched = {
browser: match[ 1 ] || "",
version: match[ 2 ] || "0"
};
browser = {};
if ( matched.browser ) {
browser[ matched.browser ] = true;
browser.version = matched.version;
}
// Chrome is Webkit, but Webkit is also Safari.
if ( browser.chrome ) {
browser.webkit = true;
} else if ( browser.webkit ) {
browser.safari = true;
}
if (window.$) $.browser = browser;
return browser;
})( navigator.userAgent );
// Naive useragent detection pattern
var is_iphone = (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))
var is_ipad = (navigator.userAgent.match(/iPad/i))
var is_android = (navigator.userAgent.match(/Android/i))
var is_mobile = is_iphone || is_ipad || is_android
var is_desktop = ! is_mobile;
var transformProp = browser.safari ? "WebkitTransform" : "transform";
if (is_android) {
document.body.parentNode.classList.add("android")
}
if (is_desktop) {
document.body.parentNode.classList.add("desktop")
}
else {
document.body.parentNode.classList.add("mobile")
}
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