Smoothing any amount of input arbitrarily

interpolator.js

function Interpolator(degree){
	var inter = [];
	
	function interpolate(a,b) {
		return a + (b-a) * 0.04;
	}
	var fn = {
		set: function(n){
			inter[0] = n;
		},
		diff: function(){
			return Math.abs(inter[0] - inter[degree])
		},
		inter: function(){
			return inter
		},
		reset: function(){
			for(var i = 0; i < degree + 1; i++){
				inter[i] = 0;
			}
		},
		get: function(){
			for(var i = 0; i < degree; i++){
				inter[i+1] = interpolate(inter[i+1], inter[i])
			}
			return inter[degree]
		}
	};
	fn.reset();
	return fn;
}

var polar_p1 = new Interpolator(2);
var polar_p2 = new Interpolator(2)

function updatePolar(p1, p2){
	if(polar_p1.diff() < 1e-5 && polar_p2.diff() < 1e-5){
		requestAnimFrame(renderPolar);
	}

	polar_p1.set(p1);
	polar_p2.set(p2);
}

function renderPolar(){
	var p1 = polar_p1.get();
	var p2 = polar_p2.get();
}