trigonometry-calculator/lib/index.js

Completely solve trigonometry equations for angles and sides

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

exports.trigCalculator = trigCalculator;

var _trigonometryEquations = require('trigonometry-equations');

/**
* Completely solve for any unknown angles or sides of a triangle
* @param {object} angles - angle indices and numerical values
* @param {object} sides - side indices and numerical values
* @return {object} error key with the issue description as the value
* @return {object} input with additional key-values pairs of solutions
*/
function trigCalculator() {
  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      _ref$angles = _ref.angles,
      angles = _ref$angles === undefined ? {} : _ref$angles,
      _ref$sides = _ref.sides,
      sides = _ref$sides === undefined ? {} : _ref$sides;

  var angleKeys = Object.keys(angles).length;
  var sideKeys = Object.keys(sides).length;
  var otherSides = function otherSides(side) {
    return Object.keys(sides).filter(function (e) {
      return e !== side;
    });
  };
  var sum = function sum(previous, current) {
    return sides[previous] + sides[current];
  };
  var sideInequality = function sideInequality(bool, key) {
    return bool && sides[key] < otherSides(key).reduce(sum);
  };
  var validSides = sideKeys > 1 && Object.keys(sides).reduce(sideInequality, true);
  var pairs = [0, 1, 2].filter(function (e) {
    return angles[e] && sides[e];
  });
  var solution = null;

  if (sideKeys === 3 && validSides) {
    solution = (0, _trigonometryEquations.angleRule)((0, _trigonometryEquations.cosineRule)((0, _trigonometryEquations.cosineRule)({ angles: angles, sides: sides })));
  } else if (sideKeys === 2 && angleKeys === 1) {
    var ambiguous = (0, _trigonometryEquations.ambiguousCaseRule)({ angles: angles, sides: sides });
    solution = { angles: angles, sides: sides };
    if (pairs.length < 1) solution = (0, _trigonometryEquations.cosineRule)(solution);
    solution = (0, _trigonometryEquations.angleRule)((0, _trigonometryEquations.sineRule)(solution));
    if (pairs.length >= 1) solution = (0, _trigonometryEquations.sineRule)(solution);
    solution = _extends({}, solution, ambiguous);
  } else if (sideKeys === 1 && angleKeys === 2) {
    solution = (0, _trigonometryEquations.sineRule)((0, _trigonometryEquations.sineRule)((0, _trigonometryEquations.angleRule)({ angles: angles, sides: sides })));
  } else {
    solution = { error: 'trigCalculator expects a valid pair of angles or sides' };
  }

  return solution;
}
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