JAVASCRIPT basis.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.basis = basis;
exports.default = _default;
function basis(t1, v0, v1, v2, v3) {
  var t2 = t1 * t1,
    t3 = t2 * t1;
  return ((1 - 3 * t1 + 3 * t2 - t3) * v0 + (4 - 6 * t2 + 3 * t3) * v1 + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2 + t3 * v3) / 6;
}
function _default(values) {
  var n = values.length - 1;
  return function (t) {
    var i = t <= 0 ? t = 0 : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
      v1 = values[i],
      v2 = values[i + 1],
      v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
      v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
    return basis((t - i / n) * n, v0, v1, v2, v3);
  };
}