adhan-extended/lib/esm/CalculationParameters.js

High precision Islamic prayer time library (extended)

import { Madhab } from './Madhab';
import HighLatitudeRule from './HighLatitudeRule';
import { PolarCircleResolution } from './PolarCircleResolution';
import { Rounding } from './Rounding';
import { Shafaq } from './Shafaq';
export default class CalculationParameters {
  // Madhab to determine how Asr is calculated.
  madhab = Madhab.Shafi; // Rule to determine the earliest time for Fajr and latest time for Isha
  // needed for high latitude locations where Fajr and Isha may not truly exist
  // or may present a hardship unless bound to a reasonable time.

  highLatitudeRule = HighLatitudeRule.MiddleOfTheNight; // Manual adjustments (in minutes) to be added to each prayer time.

  adjustments = {
    fajr: 0,
    sunrise: 0,
    dhuhr: 0,
    asr: 0,
    maghrib: 0,
    sunset: 0,
    isha: 0
  }; // Adjustments set by a calculation method. This value should not be manually modified.

  methodAdjustments = {
    fajr: 0,
    sunrise: 0,
    dhuhr: 0,
    asr: 0,
    maghrib: 0,
    sunset: 0,
    isha: 0
  }; // Rule to determine how to resolve prayer times inside the Polar Circle
  // where daylight or night may persist for more than 24 hours depending
  // on the season

  polarCircleResolution = PolarCircleResolution.Unresolved; // How seconds are rounded when calculating prayer times

  rounding = Rounding.Nearest; // Used by the MoonsightingCommittee method to determine how to calculate Isha

  shafaq = Shafaq.General;

  constructor( // Name of the method, can be used to apply special behavior in calculations.
  // This property should not be manually modified.
  method, // Angle of the sun below the horizon used for calculating Fajr.
  fajrAngle = 0, // Angle of the sun below the horizon used for calculating Isha.
  ishaAngle = 0, // Minutes after Maghrib to determine time for Isha
  // if this value is greater than 0 then ishaAngle is not used.
  ishaInterval = 0, // Angle of the sun below the horizon used for calculating Maghrib.
  // Only used by the Tehran method to account for lightness in the sky.
  maghribAngle = 0) {
    this.method = method;
    this.fajrAngle = fajrAngle;
    this.ishaAngle = ishaAngle;
    this.ishaInterval = ishaInterval;
    this.maghribAngle = maghribAngle;

    if (this.method === null) {
      // we don't want a breaking change
      this.method = 'Other';
    }
  }

  nightPortions() {
    switch (this.highLatitudeRule) {
      case HighLatitudeRule.MiddleOfTheNight:
        return {
          fajr: 1 / 2,
          isha: 1 / 2
        };

      case HighLatitudeRule.SeventhOfTheNight:
        return {
          fajr: 1 / 7,
          isha: 1 / 7
        };

      case HighLatitudeRule.TwilightAngle:
        return {
          fajr: this.fajrAngle / 60,
          isha: this.ishaAngle / 60
        };

      default:
        throw `Invalid high latitude rule found when attempting to compute night portions: ${this.highLatitudeRule}`;
    }
  }

}
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