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.
See the gallery for more examples.
Details on https://pub.dev/packages/vector_map_tiles
See vector_map_tiles/install for instructions on installing.
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,
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),
tileProviders: TileProviders(
{'openmaptiles': _cachingTileProvider(_urlTemplate())})),
],
))
])));
}
VectorTileProvider _cachingTileProvider(String urlTemplate) {
return 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.
As an alternative to using FlutterMap layers, the vector layer can be used as a child widget:
FlutterMap(
options: MapOptions(
center: LatLng(49.246292, -123.116226),
zoom: 10,
maxZoom: 15),
children: [
VectorTileLayerWidget(
options: VectorTileLayerOptions(
theme: _mapTheme(context),
tileProviders: TileProviders(
{'openmaptiles': _cachingTileProvider(_urlTemplate())}))
)
]);A vector tile hillshade layer can be added to your maps by following these steps:
- Add hillshade to your theme:
"sources": {
"openmaptiles": {"type": "vector", "url": ""},
"hillshade": {"type": "vector", "url": ""} // add hillshade to sources
},
"layers": [
// background and landcover and water features come here
// add hillshade to layers right after the water layer and before other features
{
"id": "hillshade_faint",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "shadow"],
["==", "level", 89]
],
"paint": {"fill-color": "#000", "fill-opacity": 0.02}
},
{
"id": "hillshade_medium",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "shadow"],
["==", "level", 78]
],
"paint": {"fill-color": "#000", "fill-opacity": 0.04}
},
{
"id": "hillshade_dark",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "shadow"],
["==", "level", 67]
],
"paint": {"fill-color": "#000", "fill-opacity": 0.06}
},
{
"id": "hillshade_extreme",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "shadow"],
["==", "level", 56]
],
"paint": {"fill-color": "#000", "fill-opacity": 0.08}
},
{
"id": "hillshade_highlight_medium",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "highlight"],
["==", "level", 90]
],
"paint": {"fill-color": "#fff", "fill-opacity": 0.04}
},
{
"id": "hillshade_highlight_bright",
"type": "fill",
"source": "hillshade",
"source-layer": "hillshade",
"filter": [
"all",
["==", "class", "highlight"],
["==", "level", 94]
],
"paint": {"fill-color": "#fff", "fill-opacity": 0.08}
},
// other features come here (roads etc.)
]- Add Hillshade Vector Layer to Sources
VectorTileLayerOptions(
theme: _mapTheme(),
backgroundTheme: _backgroundTheme(),
tileProviders: TileProviders({
'openmaptiles': _cachingTileProvider(_urlTemplate()),
'hillshade': _cachingTileProvider(_hillshadeUrlTemplate())
})
String _hillshadeUrlTemplate() =>
'https://api.mapbox.com/v4/mapbox.mapbox-terrain-v2/{z}/{x}/{y}.mvt?access_token=$mapboxApiKey'; Themes and tile providers must be matched to have a working configuration, since themes reference layers and properties in the vector tile.
While we don't test with all configurations, the following themes have been tested with this library:
Tiles from Maptiler or Stadia Maps
Tiles from mapbox
Other combinations of theme/provider may work too.
Some tile providers offer tiles with more detail that are intended to be drawn at a higher zoom level. For example, Mapbox provdies tiles tiles that render at 512px instead of the default 256px (Mapbox docs). Set VectorTileLayerOptions.tileOffset with these providers.
Examples provided in vector_map_tiles make use of Mapbox and Stadia Maps, both of which require attribution.
Be sure to read the terms of service of your tile data provider to ensure that you understand their attribution requirements.
CI with GitHub Actions:
Copyright 2021 David Green
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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