public override void ViewDidLoad()
{
base.ViewDidLoad();
// Clear the default layer, add a dark one instead
MapView.Layers.Clear();
MapView.Layers.Add(new CartoOnlineVectorTileLayer(CartoBaseMapStyle.CartoBasemapStyleDark));
Projection projection = MapView.Options.BaseProjection;
// Create a datasource and layer for the map
LocalVectorDataSource source = new LocalVectorDataSource(projection);
VectorLayer layer = new VectorLayer(source);
MapView.Layers.Add(layer);
// Initialize CartoSQL service, set a username
CartoSQLService service = new CartoSQLService();
service.Username = "******";
PointStyleBuilder builder = new PointStyleBuilder
{
Color = new Carto.Graphics.Color(255, 0, 0, 255),
Size = 1
};
MapView.QueryFeatures(service, source, builder.BuildStyle(), query);
}
protected override void OnCreate(Android.OS.Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Clear the default layer, add a dark one instead
MapView.Layers.Clear();
var baseLayer = new CartoOnlineVectorTileLayer(CartoBaseMapStyle.CartoBasemapStyleDarkmatter);
// Remove texts so dots would be more prominent
(baseLayer.TileDecoder as MBVectorTileDecoder).SetStyleParameter("lang", "nolang");
MapView.Layers.Add(baseLayer);
Projection projection = MapView.Options.BaseProjection;
// Create a datasource and layer for the map
LocalVectorDataSource source = new LocalVectorDataSource(projection);
VectorLayer layer = new VectorLayer(source);
MapView.Layers.Add(layer);
// Initialize CartoSQL service, set a username
CartoSQLService service = new CartoSQLService();
service.Username = "******";
PointStyleBuilder builder = new PointStyleBuilder
{
Color = new Carto.Graphics.Color(255, 0, 0, 255),
Size = 1
};
MapView.QueryFeatures(service, source, builder.BuildStyle(), query);
}
public static void QueryFeatures(this MapView map, CartoSQLService service, LocalVectorDataSource source, PointStyle style, string query)
{
System.Threading.Tasks.Task.Run(delegate
{
FeatureCollection features = service.QueryFeatures(query, map.Options.BaseProjection);
for (int i = 0; i < features.FeatureCount; i++)
{
Feature feature = features.GetFeature(i);
PointGeometry geometry = (PointGeometry)feature.Geometry;
var point = new Point(geometry, style);
source.Add(point);
}
});
}
public static void QueryFeatures(this MapView map, CartoSQLService service, LocalVectorDataSource source, PointStyle style, string query)
{
System.Threading.Tasks.Task.Run(delegate
{
FeatureCollection features = service.QueryFeatures(query, map.Options.BaseProjection);
for (int i = 0; i < features.FeatureCount; i++)
{
Feature feature = features.GetFeature(i);
PointGeometry geometry = (PointGeometry)feature.Geometry;
var point = new Point(geometry, style);
source.Add(point);
}
});
}
