added relative altitude mini widget

src/components/MiniWidgetInstantiator.vue

@@ -1,4 +1,7 @@
 <template>
+  <template v-if="miniWidget.component === MiniWidgetType.AltitudeIndicator">
+    <AltitudeIndicator :mini-widget="miniWidget" />
+  </template>
   <template v-if="miniWidget.component === MiniWidgetType.ArmerButton">
     <ArmerButton :options="miniWidget" />
   </template>
@@ -36,6 +39,7 @@ import { toRefs } from 'vue'
 
 import { type MiniWidget, MiniWidgetType } from '@/types/miniWidgets'
 
+import AltitudeIndicator from './mini-widgets/RelativeAltitudeIndicator.vue'
 import ArmerButton from './mini-widgets/ArmerButton.vue'
 import BaseCommIndicator from './mini-widgets/BaseCommIndicator.vue'
 import BatteryIndicator from './mini-widgets/BatteryIndicator.vue'

src/components/mini-widgets/RelativeAltitudeIndicator.vue

@@ -0,0 +1,26 @@
+<template>
+    <div class="flex items-center w-fit min-w-[8rem] max-w-[9rem] h-12 p-1 text-white justify-center">
+        <img src="@/assets/altitude-icon.svg" class="h-full" :draggable="false" />
+        <div class="flex flex-col items-start justify-center ml-1 min-w-[4rem] max-w-[6rem] select-none">
+            <div>
+                <span class="font-mono text-xl font-semibold leading-6 w-fit">{{ round(altitude, 2).toFixed(2) }}</span>
+                <span class="text-xl font-semibold leading-6 w-fit"> m</span>
+            </div>
+            <span class="w-full text-sm font-semibold leading-4 whitespace-nowrap">Alt (Rel)</span>
+        </div>
+    </div>
+</template>
+
+<script setup lang="ts">
+import { ref, watch } from 'vue'
+
+import { round } from '@/libs/utils'
+import { useMainVehicleStore } from '@/stores/mainVehicle'
+
+const store = useMainVehicleStore()
+
+const altitude = ref(0)
+watch(store.altitude, () => (altitude.value = store.altitude.rel))
+
+</script>
+

src/libs/vehicle/ardupilot/ardupilot.ts

@@ -54,7 +54,7 @@ export type ArduPilot = ArduPilotVehicle<any>
  * Generic ArduPilot vehicle
  */
 export abstract class ArduPilotVehicle<Modes> extends Vehicle.AbstractVehicle<Modes> {
-  _altitude = new Altitude({ msl: 0 })
+  _altitude = new Altitude({ msl: 0, rel: 0})
   _attitude = new Attitude({ roll: 0, pitch: 0, yaw: 0 })
   _communicationDropRate = 0
   _communicationErrors = 0
@@ -269,6 +269,8 @@ export abstract class ArduPilotVehicle<Modes> extends Vehicle.AbstractVehicle<Mo
         this._velocity.ground = Math.sqrt(this._velocity.x ** 2 + this._velocity.y ** 2)
         this._velocity.overall = Math.sqrt(this._velocity.x ** 2 + this._velocity.y ** 2 + this._velocity.z ** 2)
         this.onVelocity.emit()
+        this._altitude.rel = position.relative_alt / 1000 // (mm to meters)
+        this.onAltitude.emit()
         break
       }
       case MAVLinkType.GPS_RAW_INT: {

src/libs/vehicle/types.ts

@@ -122,7 +122,7 @@ export class Attitude {
  */
 export class Altitude {
   msl: number // Mean Sea Level, in meters
-
+  rel: number // Relative altitude, in meters
   /**
    * Create object
    * @param {Partial<Altitude>} init

src/types/miniWidgets.ts

@@ -3,6 +3,7 @@
  * The enum value is equal to the component's filename, without the '.vue' extension
  */
 export enum MiniWidgetType {
+  AltitudeIndicator = 'AltitudeIndicator',
   ArmerButton = 'ArmerButton',
   BaseCommIndicator = 'BaseCommIndicator',
   BatteryIndicator = 'BatteryIndicator',