Easing (Normalised)

easing.js

/*
 * Easing Functions - inspired from http://gizma.com/easing/
 * only considering the t value for the range [0, 1] => [0, 1]
 */
var easing = {
	// no easing, no acceleration
	linear: function (t) { return t },
	// accelerating from zero velocity
	easeInQuad: function (t) { return t*t },
	// decelerating to zero velocity
	easeOutQuad: function (t) { return t*(2-t) },
	// acceleration until halfway, then deceleration
	easeInOutQuad: function (t) { return t<.5 ? 2*t*t : -1+(4-2*t)*t },
	// accelerating from zero velocity 
	easeInCubic: function (t) { return t*t*t },
	// decelerating to zero velocity 
	easeOutCubic: function (t) { return (--t)*t*t+1 },
	// acceleration until halfway, then deceleration 
	easeInOutCubic: function (t) { return t<.5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1 },
	// accelerating from zero velocity 
	easeInQuart: function (t) { return t*t*t*t },
	// decelerating to zero velocity 
	easeOutQuart: function (t) { return 1-(--t)*t*t*t },
	// acceleration until halfway, then deceleration
	easeInOutQuart: function (t) { return t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t },
	// accelerating from zero velocity
	easeInQuint: function (t) { return t*t*t*t*t },
	// decelerating to zero velocity
	easeOutQuint: function (t) { return 1+(--t)*t*t*t*t },
	// acceleration until halfway, then deceleration 
	easeInOutQuint: function (t) { return t<.5 ? 16*t*t*t*t*t : 1+16*(--t)*t*t*t*t },
	// get an eased value between two values
	range: function (e, t, a, b) { return a + easing[e](t) * -(a - b) }
}