weatherobject.js

/* Magic Mirror
 * Module: Weather
 *
 * By Michael Teeuw https://michaelteeuw.nl
 * MIT Licensed.
 *
 * This class is the blueprint for a day which includes weather information.
 *
 * Currently this is focused on the information which is necessary for the current weather.
 * As soon as we start implementing the forecast, mode properties will be added.
 */
class WeatherObject {
	constructor(units, tempUnits, windUnits, useKmh) {
		this.units = units;
		this.tempUnits = tempUnits;
		this.windUnits = windUnits;
		this.useKmh = useKmh;
		this.date = null;
		this.windSpeed = null;
		this.windDirection = null;
		this.sunrise = null;
		this.sunset = null;
		this.temperature = null;
		this.minTemperature = null;
		this.maxTemperature = null;
		this.weatherType = null;
		this.humidity = null;
		this.rain = null;
		this.snow = null;
		this.precipitation = null;
		this.feelsLikeTemp = null;
	}


	beaufortWindSpeed() {
		const windInKmh = this.windUnits === "imperial" ? this.windSpeed * 1.609344 : this.useKmh ? this.windSpeed : (this.windSpeed * 60 * 60) / 1000;
		const speeds = [1, 5, 11, 19, 28, 38, 49, 61, 74, 88, 102, 117, 1000];
		for (const [index, speed] of speeds.entries()) {
			if (speed > windInKmh) {
				return index;
			}
		}
		return 12;
	}

	kmhWindSpeed() {
		const windInKmh = this.windUnits === "imperial" ? this.windSpeed * 1.609344 : (this.windSpeed * 60 * 60) / 1000;
		return windInKmh;
	}

	nextSunAction() {
		return moment().isBetween(this.sunrise, this.sunset) ? "sunset" : "sunrise";
	}

	feelsLike() {
		if (this.feelsLikeTemp) {
			return this.feelsLikeTemp;
		}
		const windInMph = this.windUnits === "imperial" ? this.windSpeed : this.windSpeed * 2.23694;
		const tempInF = this.tempUnits === "imperial" ? this.temperature : (this.temperature * 9) / 5 + 32;
		let feelsLike = tempInF;

		if (windInMph > 3 && tempInF < 50) {
			feelsLike = Math.round(35.74 + 0.6215 * tempInF - 35.75 * Math.pow(windInMph, 0.16) + 0.4275 * tempInF * Math.pow(windInMph, 0.16));
		} else if (tempInF > 80 && this.humidity > 40) {
			feelsLike =
				-42.379 +
				2.04901523 * tempInF +
				10.14333127 * this.humidity -
				0.22475541 * tempInF * this.humidity -
				6.83783 * Math.pow(10, -3) * tempInF * tempInF -
				5.481717 * Math.pow(10, -2) * this.humidity * this.humidity +
				1.22874 * Math.pow(10, -3) * tempInF * tempInF * this.humidity +
				8.5282 * Math.pow(10, -4) * tempInF * this.humidity * this.humidity -
				1.99 * Math.pow(10, -6) * tempInF * tempInF * this.humidity * this.humidity;
		}

		return this.tempUnits === "imperial" ? feelsLike : ((feelsLike - 32) * 5) / 9;
	}
}