mirror of
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109 lines
3.0 KiB
JavaScript
109 lines
3.0 KiB
JavaScript
// get the settings for units
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import settings from '../settings.mjs';
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// *********************************** unit conversions ***********************
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// round 2 provided for lat/lon formatting
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const round2 = (value, decimals) => Math.trunc(value * 10 ** decimals) / 10 ** decimals;
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const kphToMph = (Kph) => Math.round(Kph / 1.609_34);
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const celsiusToFahrenheit = (Celsius) => Math.round((Celsius * 9) / 5 + 32);
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const kilometersToMiles = (Kilometers) => Math.round(Kilometers / 1.609_34);
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const metersToFeet = (Meters) => Math.round(Meters / 0.3048);
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const pascalToInHg = (Pascal) => round2(Pascal * 0.000_295_3, 2);
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// each module/page/slide creates it's own unit converter as needed by providing the base units available
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// the factory function then returns an appropriate converter or pass-thru function for use on the page
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const windSpeed = (defaultUnit = 'si') => {
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// default to passthru
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let converter = (passthru) => Math.round(passthru);
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// change the converter if there is a mismatch
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if (defaultUnit !== settings.units.value) {
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converter = kphToMph;
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}
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// append units
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if (settings.units.value === 'si') {
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converter.units = 'kph';
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} else {
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converter.units = 'MPH';
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}
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return converter;
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};
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const temperature = (defaultUnit = 'si') => {
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// default to passthru
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let converter = (passthru) => Math.round(passthru);
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// change the converter if there is a mismatch
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if (defaultUnit !== settings.units.value) {
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converter = celsiusToFahrenheit;
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}
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// append units
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if (settings.units.value === 'si') {
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converter.units = 'C';
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} else {
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converter.units = 'F';
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}
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return converter;
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};
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const distanceMeters = (defaultUnit = 'si') => {
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// default to passthru
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let converter = (passthru) => Math.round(passthru);
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// change the converter if there is a mismatch
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if (defaultUnit !== settings.units.value) {
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// rounded to the nearest 100 (ceiling)
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converter = (value) => Math.round(metersToFeet(value) / 100) * 100;
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}
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// append units
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if (settings.units.value === 'si') {
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converter.units = 'm.';
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} else {
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converter.units = 'ft.';
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}
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return converter;
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};
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const distanceKilometers = (defaultUnit = 'si') => {
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// default to passthru
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let converter = (passthru) => Math.round(passthru / 1000);
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// change the converter if there is a mismatch
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if (defaultUnit !== settings.units.value) {
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converter = (value) => Math.round(kilometersToMiles(value) / 1000);
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}
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// append units
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if (settings.units.value === 'si') {
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converter.units = ' km.';
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} else {
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converter.units = ' mi.';
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}
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return converter;
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};
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const pressure = (defaultUnit = 'si') => {
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// default to passthru (millibar)
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let converter = (passthru) => Math.round(passthru / 100);
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// change the converter if there is a mismatch
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if (defaultUnit !== settings.units.value) {
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converter = (value) => pascalToInHg(value).toFixed(2);
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}
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// append units
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if (settings.units.value === 'si') {
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converter.units = ' mbar';
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} else {
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converter.units = ' in.hg';
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}
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return converter;
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};
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export {
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// unit conversions
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windSpeed,
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temperature,
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distanceMeters,
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distanceKilometers,
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pressure,
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// formatter
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round2,
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};
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