Configurable altitude units

3 files changed, 38 insertions, 2 deletions

diff --git a/modern/src/common/components/PositionValue.js b/modern/src/common/components/PositionValue.js
index 83fc0ef2..f80bc684 100644
--- a/modern/src/common/components/PositionValue.js
+++ b/modern/src/common/components/PositionValue.js
@@ -2,7 +2,7 @@ import React from 'react';
 import { Link } from '@mui/material';
 import { Link as RouterLink } from 'react-router-dom';
 import {
-  formatAlarm, formatBoolean, formatCoordinate, formatCourse, formatDistance, formatNumber, formatPercentage, formatSpeed, formatTime,
+  formatAlarm, formatAltitude, formatBoolean, formatCoordinate, formatCourse, formatDistance, formatNumber, formatPercentage, formatSpeed, formatTime,
 } from '../util/formatter';
 import { useAttributePreference, usePreference } from '../util/preferences';
 import { useTranslation } from './LocalizationProvider';
@@ -18,6 +18,7 @@ const PositionValue = ({ position, property, attribute }) => {
   const value = property ? position[property] : position.attributes[attribute];
 
   const distanceUnit = useAttributePreference('distanceUnit');
+  const altitudeUnit = useAttributePreference('altitudeUnit');
   const speedUnit = useAttributePreference('speedUnit');
   const coordinateFormat = usePreference('coordinateFormat');
 
@@ -35,6 +36,8 @@ const PositionValue = ({ position, property, attribute }) => {
         return formatSpeed(value, speedUnit, t);
       case 'course':
         return formatCourse(value);
+      case 'altitude':
+        return formatAltitude(value, altitudeUnit, t);
       case 'batteryLevel':
         return formatPercentage(value);
       case 'alarm':
diff --git a/modern/src/common/util/converter.js b/modern/src/common/util/converter.js
index 559e68aa..cb21566b 100644
--- a/modern/src/common/util/converter.js
+++ b/modern/src/common/util/converter.js
@@ -54,6 +54,30 @@ export const distanceFromMeters = (value, unit) => value * distanceConverter(uni
 
 export const distanceToMeters = (value, unit) => value / distanceConverter(unit);
 
+const altitudeConverter = (unit) => {
+  switch (unit) {
+    case 'ft':
+      return 3.28084;
+    case 'm':
+    default:
+      return 1;
+  }
+};
+
+export const altitudeUnitString = (unit, t) => {
+  switch (unit) {
+    case 'ft':
+      return t('sharedFeet');
+    case 'm':
+    default:
+      return t('sharedMeters');
+  }
+};
+
+export const altitudeFromMeters = (value, unit) => value * altitudeConverter(unit);
+
+export const altitudeToMeters = (value, unit) => value / altitudeConverter(unit);
+
 const volumeConverter = (unit) => {
   switch (unit) {
     case 'impGal':
diff --git a/modern/src/common/util/formatter.js b/modern/src/common/util/formatter.js
index 034b0401..f36b4d38 100644
--- a/modern/src/common/util/formatter.js
+++ b/modern/src/common/util/formatter.js
@@ -1,6 +1,13 @@
 import moment from 'moment';
 import {
-  distanceFromMeters, distanceUnitString, speedFromKnots, speedUnitString, volumeFromLiters, volumeUnitString,
+  altitudeFromMeters,
+  altitudeUnitString,
+  distanceFromMeters,
+  distanceUnitString,
+  speedFromKnots,
+  speedUnitString,
+  volumeFromLiters,
+  volumeUnitString,
 } from './converter';
 import { prefixString } from './stringUtils';
 
@@ -26,6 +33,8 @@ export const formatCourse = (value) => {
 
 export const formatDistance = (value, unit, t) => `${distanceFromMeters(value, unit).toFixed(2)} ${distanceUnitString(unit, t)}`;
 
+export const formatAltitude = (value, unit, t) => `${altitudeFromMeters(value, unit).toFixed(2)} ${altitudeUnitString(unit, t)}`;
+
 export const formatSpeed = (value, unit, t) => `${speedFromKnots(value, unit).toFixed(2)} ${speedUnitString(unit, t)}`;
 
 export const formatVolume = (value, unit, t) => `${volumeFromLiters(value, unit).toFixed(2)} ${volumeUnitString(unit, t)}`;