maplibre-offline-map-manager

Development

Manages offline-capable mapping with tile caching, location services, and MapLibre integration. Use when implementing map features, GPS tracking, offline map regions, or custom map styles in Purrsuit Mobile App.

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How to use this skill

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MapLibre Offline Map Manager

This skill handles MapLibre integration, offline tile management, and location services following the patterns established in the Purrsuit Mobile App.

When to Use This Skill

Use this skill when you need to:

Implement interactive maps using MapLibre
Handle GPS location tracking and permissions
Manage offline map regions (download, delete, list)
Switch between custom map styles (Liberty, Bright, Positron, Dark)
Perform geocoding or reverse geocoding
Fit map bounds to a collection of coordinates

Map Components

MapView with Camera

import { MapView, Camera, PointAnnotation } from "@maplibre/maplibre-react-native"
import { MAP_STYLES } from "@/services/offlineMapManager"

<MapView
  ref={mapRef}
  style={StyleSheet.absoluteFillObject}
  mapStyle={MAP_STYLES[mapStyle].url}
>
  <Camera
    ref={cameraRef}
    longitude={longitude}
    latitude={latitude}
    zoom={12}
  />
</MapView>

Point Annotations (Markers)

<PointAnnotation
  id={encounter.id}
  coordinate={[lng, lat]}
  onSelected={() => handleMarkerPress(encounter.id)}
>
  <View style={styles.marker}>
    <Text>{emoji}</Text>
  </View>
</PointAnnotation>

Offline Management

Downloading a Region

import { offlineMapManager } from "@/services/offlineMapManager"

await offlineMapManager.downloadRegion({
  name: "Downtown SF",
  bounds: [[-122.45, 37.8], [-122.4, 37.75]],
  minZoom: 10,
  maxZoom: 16
}, (status) => {
  console.log(`Download progress: ${status.percentage}%`)
})

Location Services

Getting Current Location

import { getCurrentLocation, requestLocationPermissions } from "@/services/location"

const permission = await requestLocationPermissions()
if (permission.granted) {
  const coords = await getCurrentLocation()
  // { latitude, longitude, accuracy }
}

Reverse Geocoding

import { reverseGeocodeAsync, formatAddress } from "@/services/location"

const address = await reverseGeocodeAsync(lat, lng)
const displayString = formatAddress(address)

Advanced Patterns

Fitting Multiple Markers

const bounds = [minLng, minLat, maxLng, maxLat] // [W, S, E, N]
cameraRef.current?.fitBounds(bounds, {
  padding: { top: 50, right: 50, bottom: 50, left: 50 },
  duration: 1000,
})

Coordinate Conversion

import { toMapLibreCoords, fromMapLibreCoords } from "@/services/offlineMapManager"

const mapLibreCoord = toMapLibreCoords({ latitude, longitude }) // [lng, lat]
const nativeCoord = fromMapLibreCoords([lng, lat]) // { latitude, longitude }

References

See MAP_PATTERNS.md for detailed implementation examples.

See OFFLINE_STRATEGIES.md for tile caching and database management.