A plugin for flutter_map that enables the use of vector tiles with slippy maps and Flutter

Jun 17, 2021 00:00 · 281 words · 2 minute read Flutter

A plugin for flutter_map that enables the use of vector tiles with slippy maps and Flutter.

Loads vector tiles from a source such as Mapbox or Stadia Maps, and renders them as a layer on a flutter_map.

Tile rendering can be vector, mixed, or raster. Mixed mode is default, since that provides an optimal trade-off between sharp visuals when idle, and smooth animation when zooming with a pinch gesture.

vector_map_tiles-example

Usage

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: SafeArea(
            child: Column(children: [
          Flexible(
              child: FlutterMap(
            options: MapOptions(
                center: LatLng(49.246292, -123.116226),
                zoom: 10,
                maxZoom: 15,
                interactiveFlags: InteractiveFlag.doubleTapZoom |
                    InteractiveFlag.drag |
                    InteractiveFlag.pinchZoom |
                    InteractiveFlag.pinchMove,
                plugins: [VectorMapTilesPlugin()]),
            layers: <LayerOptions>[
              // normally you would see TileLayerOptions which provides raster tiles
              // instead this vector tile layer replaces the standard tile layer
              VectorTileLayerOptions(
                  theme: _mapTheme(context),
                  tileProvider: MemoryCacheVectorTileProvider(
                      delegate: NetworkVectorTileProvider(
                          urlTemplate: _urlTemplate(),
                          // this is the maximum zoom of the provider, not the
                          // maximum of the map. vector tiles are rendered
                          // to larger sizes to support higher zoom levels
                          maximumZoom: 14),
                      maxSizeBytes: 1024 * 1024 * 2)),
            ],
          ))
        ])));
  }

  _mapTheme(BuildContext context) {
    // maps are rendered using themes
    // to provide a dark theme do something like this:
    // if (MediaQuery.of(context).platformBrightness == Brightness.dark) return myDarkTheme();
    return ProvidedThemes.lightTheme();
  }

  String _urlTemplate() {
    // Stadia Maps source https://docs.stadiamaps.com/vector/
    return 'https://tiles.stadiamaps.com/data/openmaptiles/{z}/{x}/{y}.pbf?api_key=$apiKey';

    // Mapbox source https://docs.mapbox.com/api/maps/vector-tiles/#example-request-retrieve-vector-tiles
    // return 'https://api.mapbox.com/v4/mapbox.mapbox-streets-v8/{z}/{x}/{y}.mvt?access_token=$apiKey',
  }
}

See the example for details.

Status

This plugin is fairly new and has not yet been broadly used. It’s feature complete enough to be a v1, but does

have performance issues on larger screens such as on a tablet or very old devices.

GitHub

https://github.com/greensopinion/flutter-vector-map-tiles

Source: https://flutterawesome.com/a-plugin-for-flutter_map-that-enables-the-use-of-vector-tiles-with-slippy-maps-and-flutter/

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