layers

Layers

Layers can be added to the map after the MapReady event has been triggered by calling the AddLayerAsync method and providing the desired layer with its Options and EventsActivationFlags.

• Bubble Layer
• Heatmap Layer
• Image Layer
• Line Layer
• Polygon Extrusion Layer
• Polygon Layer
• Symbol Layer

Add a layer

@page "/TileLayerOnReady"

@using AzureMapsControl.Components.Map
<AzureMap Id="map"
          CameraOptions="new CameraOptions { Center = new Components.Atlas.Position(-99.47, 40.75), Zoom = 4}"
          EventActivationFlags="MapEventActivationFlags
                                .None()
                                .Enable(MapEventType.Ready)"
          OnReady="OnMapReady" />

@code  {
    public async Task OnMapReady(MapEventArgs events)
    {
        var layer = new AzureMapsControl.Components.Layers.TileLayer
        {
            Options = new Components.Layers.TileLayerOptions("https://mesonet.agron.iastate.edu/cache/tile.py/1.0.0/nexrad-n0q-900913/{z}/{x}/{y}.png"),
            EventActivationFlags = AzureMapsControl.Components.Layers.LayerEventActivationFlags.None().Enable(AzureMapsControl.Components.Layers.LayerEventType.LayerAdded)
        };

        layer.OnLayerAdded += e =>
        {
            Console.WriteLine("Layer added");
        };

        await events.Map.AddLayerAsync(layer);
    }
}

Events

The following events are available and can be enabled or disabled for all the different types of layers : MouseDown, MouseUp, MouseOver, MouseMove, Click, DblClick, MouseOut, MouseEnter, MouseLeave, ContextMenu, TouchStart, TouchEnd, TouchMove, TouchCancel, Wheel. By default, all the events are deactivated. The events flags can be passed on the Options while creating the layer.

var layer = new AzureMapsControl.Components.Layers.TileLayer
        {
            Options = new Components.Layers.TileLayerOptions("https://mesonet.agron.iastate.edu/cache/tile.py/1.0.0/nexrad-n0q-900913/{z}/{x}/{y}.png"),
            EventActivationFlags = AzureMapsControl.Components.Layers.LayerEventActivationFlags.None().Enable(AzureMapsControl.Components.Layers.LayerEventType.LayerAdded, AzureMapsControl.Components.Layers.LayerEventType.LayerRemoved)
        };

Remove a layer

Layers can be removed by calling the RemoveLayersAsync method on the map and providing the list of layers to remove or their ids.

@page "/LayerRemove"

@using AzureMapsControl.Components.Map
<AzureMap Id="map"
          CameraOptions="new CameraOptions { Center = new Components.Atlas.Position(-99.47, 40.75), Zoom = 4 } "
          EventActivationFlags="MapEventActivationFlags
                                .None()
                                .Enable(MapEventType.Ready)"
          OnReady="OnMapReady" />

@code  {
    public async Task OnMapReady(MapEventArgs events)
    {
        var layer = new AzureMapsControl.Components.Layers.TileLayer
        {
            Options = new Components.Layers.TileLayerOptions("https://mesonet.agron.iastate.edu/cache/tile.py/1.0.0/nexrad-n0q-900913/{z}/{x}/{y}.png"),
            EventActivationFlags = AzureMapsControl.Components.Layers.LayerEventActivationFlags.None().Enable(AzureMapsControl.Components.Layers.LayerEventType.LayerAdded, AzureMapsControl.Components.Layers.LayerEventType.LayerRemoved)
        };

        layer.OnLayerAdded += e =>
        {
            Console.WriteLine("Layer added");
        };

        layer.OnLayerRemoved += e =>
        {
            Console.WriteLine("Layer removed");
        };

        await events.Map.AddLayerAsync(layer);

        System.Threading.Thread.Sleep(10000);

        await events.Map.RemoveLayersAsync(layer);
    }
}

A ClearLayersAsync method on the Map allows you to remove all the user added layers.