add si units close #52

server/scripts/modules/utils/units.mjs

@@ -1,5 +1,8 @@
+// get the settings for units
+import settings from '../settings.mjs';
 // *********************************** unit conversions ***********************
 
+// round 2 provided for lat/lon formatting
 const round2 = (value, decimals) => Math.trunc(value * 10 ** decimals) / 10 ** decimals;
 
 const kphToMph = (Kph) => Math.round(Kph / 1.609_34);
@@ -8,11 +11,98 @@ const kilometersToMiles = (Kilometers) => Math.round(Kilometers / 1.609_34);
 const metersToFeet = (Meters) => Math.round(Meters / 0.3048);
 const pascalToInHg = (Pascal) => round2(Pascal * 0.000_295_3, 2);
 
+// each module/page/slide creates it's own unit converter as needed by providing the base units available
+// the factory function then returns an appropriate converter or pass-thru function for use on the page
+
+const windSpeed = (defaultUnit = 'si') => {
+	// default to passthru
+	let converter = (passthru) => Math.round(passthru);
+	// change the converter if there is a mismatch
+	if (defaultUnit !== settings.units.value) {
+		converter = kphToMph;
+	}
+	// append units
+	if (settings.units.value === 'si') {
+		converter.units = 'kph';
+	} else {
+		converter.units = 'MPH';
+	}
+	return converter;
+};
+
+const temperature = (defaultUnit = 'si') => {
+	// default to passthru
+	let converter = (passthru) => Math.round(passthru);
+	// change the converter if there is a mismatch
+	if (defaultUnit !== settings.units.value) {
+		converter = celsiusToFahrenheit;
+	}
+	// append units
+	if (settings.units.value === 'si') {
+		converter.units = 'C';
+	} else {
+		converter.units = 'F';
+	}
+	return converter;
+};
+
+const distanceMeters = (defaultUnit = 'si') => {
+	// default to passthru
+	let converter = (passthru) => Math.round(passthru);
+	// change the converter if there is a mismatch
+	if (defaultUnit !== settings.units.value) {
+		// rounded to the nearest 100 (ceiling)
+		converter = (value) => Math.round(metersToFeet(value) / 100) * 100;
+	}
+	// append units
+	if (settings.units.value === 'si') {
+		converter.units = 'm.';
+	} else {
+		converter.units = 'ft.';
+	}
+	return converter;
+};
+
+const distanceKilometers = (defaultUnit = 'si') => {
+	// default to passthru
+	let converter = (passthru) => Math.round(passthru / 1000);
+	// change the converter if there is a mismatch
+	if (defaultUnit !== settings.units.value) {
+		converter = (value) => Math.round(kilometersToMiles(value) / 1000);
+	}
+	// append units
+	if (settings.units.value === 'si') {
+		converter.units = ' km.';
+	} else {
+		converter.units = ' mi.';
+	}
+	return converter;
+};
+
+const pressure = (defaultUnit = 'si') => {
+	// default to passthru (millibar)
+	let converter = (passthru) => Math.round(passthru / 100);
+	// change the converter if there is a mismatch
+	if (defaultUnit !== settings.units.value) {
+		converter = (value) => pascalToInHg(value).toFixed(2);
+	}
+	// append units
+	if (settings.units.value === 'si') {
+		converter.units = ' mbar';
+	} else {
+		converter.units = ' in.hg';
+	}
+	return converter;
+};
+
 export {
-	kphToMph,
-	celsiusToFahrenheit,
-	kilometersToMiles,
-	metersToFeet,
-	pascalToInHg,
+	// unit conversions
+	windSpeed,
+	temperature,
+	distanceMeters,
+	distanceKilometers,
+	pressure,
+
+	// formatter
 	round2,
 };