How to use Ease and Wizz's elastic easing in one dimension, even when applied to a 2D property like scale. Line 60 is where the magic happens. #easeandwizz

Ease and Wizz elastic in one dimension.js

// Ease and Wizz 2.0.4 : outElastic : All keyframes
// Ian Haigh (http://ianhaigh.com/easeandwizz/)
// Last built: 2013-07-05T11:46:51+10:00
// some defaults
var p = 0.81;		// period for elastic
var a = 50;		// amplitude for elastic
var s = 1.70158;	// overshoot amount for "back"
function easeandwizz_outElastic(t, b, c, d, a, p) {
	if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
	if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
	else var s = p/(2*Math.PI) * Math.asin (c/a);
	return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
}
function easeAndWizz() {
	var n = 0;
	if (numKeys > 0) {
		n = nearestKey(time).index;
		if (key(n).time > time)	{ n-- }
	}
	try {
		var key1 = key(n);
		var key2 = key(n+1);
	} catch(e) {
		return null;
	}
	
	// determine how many dimensions the keyframes need
	var dim = 1; // It's gotta have at least ONE dimension
	try {
		key(1)[1];
		dim = 2;
		key(1)[2];
		dim = 3;
	} catch(e) {}
	t = time - key1.time;
	d = key2.time - key1.time;
	sX = key1[0];
	eX = key2[0] - key1[0];
	if (dim >= 2) {
		sY = key1[1];
		eY = key2[1] - key1[1];
		if (dim >= 3) {
			sZ = key1[2];
			eZ = key2[2] - key1[2];
		}
	}
	if ((time < key1.time) || (time > key2.time)) {
		return value;
	} else {
		val1 =  easeandwizz_outElastic(t, sX, eX, d, a, p, s);
		switch (dim) {
			case 1:
			     return val1;
			     break;
			case 2:
			     val2 = easeandwizz_outElastic(t, sY, eY, d, a, p, s);
			     //////////////////////////////////////////////////
			     //////////////////////////////////////////////////

			     return [value[0], val2]; 		// This is the bit that's changed 

			     //////////////////////////////////////////////////
			     //////////////////////////////////////////////////
			     break;
			case 3:
			     val2 = easeandwizz_outElastic(t, sY, eY, d, a, p, s);
			     val3 = easeandwizz_outElastic(t, sZ, eZ, d, a, p, s);
			     return [val1, val2, val3];
			     break;
			default:
			     return null;
		}
	}
}
(easeAndWizz() || value);

Monsieur Oeuf! Are you still active sir? The above is AMAZINGLY useful for me (a complete beginner) but I can't work out how to change it from affecting the X scale of a layer, to changing the Y scale instead... Can you save me?