victory-vendor/lib-vendor/d3-ease/src/elastic.js

Vendored dependencies for Victory

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.elasticOut = exports.elasticInOut = exports.elasticIn = void 0;

var _math = require("./math.js");

var tau = 2 * Math.PI,
    amplitude = 1,
    period = 0.3;

var elasticIn = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticIn(t) {
    return a * (0, _math.tpmt)(- --t) * Math.sin((s - t) / p);
  }

  elasticIn.amplitude = function (a) {
    return custom(a, p * tau);
  };

  elasticIn.period = function (p) {
    return custom(a, p);
  };

  return elasticIn;
}(amplitude, period);

exports.elasticIn = elasticIn;

var elasticOut = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticOut(t) {
    return 1 - a * (0, _math.tpmt)(t = +t) * Math.sin((t + s) / p);
  }

  elasticOut.amplitude = function (a) {
    return custom(a, p * tau);
  };

  elasticOut.period = function (p) {
    return custom(a, p);
  };

  return elasticOut;
}(amplitude, period);

exports.elasticOut = elasticOut;

var elasticInOut = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticInOut(t) {
    return ((t = t * 2 - 1) < 0 ? a * (0, _math.tpmt)(-t) * Math.sin((s - t) / p) : 2 - a * (0, _math.tpmt)(t) * Math.sin((s + t) / p)) / 2;
  }

  elasticInOut.amplitude = function (a) {
    return custom(a, p * tau);
  };

  elasticInOut.period = function (p) {
    return custom(a, p);
  };

  return elasticInOut;
}(amplitude, period);

exports.elasticInOut = elasticInOut;