periodic-function/interpolate.js

Collection of periodic functions

'use strict'

module.exports = function interpolate(t, samples) {
	t%=1
	if (t < 0) t += 1

	var ptr = t*samples.length
	var left = Math.floor(ptr)
	var right = Math.ceil(ptr)
	if (left === right) right++
	right %= samples.length
	var ratio = ptr - left

	return samples[right] * ratio + samples[left] * (1 - ratio)
}