Contents
Exercise outline
The goal of this exercise is to visualize multiple data sets on one single map; doing so, different data sets can be compared at the same geospatial position(s) and/or for the same modeling time step(s).
As an example, after this exercise it should be possible to show both the input data and the output data of a volume model in one and the same map view.
Create a new map layer provider
Add a new folder to the plugin project named Layers. In this folder, create a new class named VolumeModelLayerProvider.cs and add the following code:
using System.Collections.Generic;
using DelftTools.Shell.Gui;
using DeltaShell.Plugin.DemoApp.Models;
using SharpMap.Api.Layers;
using SharpMap.Layers;
namespace DeltaShell.Plugin.DemoApp.Layers
{
public class VolumeModelMapLayerProvider : IMapLayerProvider
{
/// <summary>
/// Defines that layers can be provided for volume models
/// </summary>
public bool CanCreateLayerFor(object data, object parentData)
{
return data is VolumeModel;
}
/// <summary>
/// Creates a volume model group layer
/// </summary>
public ILayer CreateLayer(object data, object parentData)
{
var volumeModel = data as VolumeModel;
if (volumeModel != null)
{
return new GroupLayer(volumeModel.Name);
}
return null;
}
/// <summary>
/// Returns all children for which a child layer should be created in volume model group layers
/// </summary>
public IEnumerable<object> ChildLayerObjects(object data)
{
var volumeModel = data as VolumeModel;
if (volumeModel != null)
{
// In the end a child layer should be created for both the catchment input data and the volume output data
yield return volumeModel.Basin;
yield return volumeModel.Volume;
}
}
}
}
Fixme
Fixme
Exercise results
[TODO] Description of the exercise results
1. Create a new class named "DemoAppMapLayerProvider"
2. Add the following contents to this class:
using System.Collections.Generic;
using System.Linq;
using DelftTools.Shell.Gui;
using DeltaShell.Plugin.DemoApp.Models;
using SharpMap.Api.Layers;
using SharpMap.Layers;
namespace DeltaShell.Plugin.DemoApp
{
public class DemoAppMapLayerProvider : IMapLayerProvider
{
public ILayer CreateLayer(object data, object parentData)
{
var myModel = data as VolumeModel;
if (myModel != null)
{
return new GroupLayer(myModel.Name);
}
return null;
}
public bool CanCreateLayerFor(object data, object parentData)
{
return data is VolumeModel;
}
public IEnumerable<object> ChildLayerObjects(object data)
{
var myModel = data as VolumeModel;
if (myModel != null)
{
return myModel.DataItems.Select(d => d.Value);
}
return Enumerable.Empty<object>();
}
}
}
3. Register the map layer provider in the gui plugin class by adding the following code to DemoAppGuiPlugin:
public override IMapLayerProvider MapLayerProvider
{
get { return new DemoAppMapLayerProvider(); }
}
4. Run the application and create a volume model: a dialog to select a view for the volume model will automatically be opened Image Select Central map
