Displaying schematic images

[Peter]

I'm using UriImage provider as a base class to allow me to display various image files (e.g. floor plans). I don't have geographic coordinates for the images but I want to overlay data on the image relative to the image bottom left, using pixel coordinates. I've configured my provider class to use EPSG900913Projection as its spatial reference. Effectively my image should be displayed with the bottom left corner at 0,0. This is what my provider class looks like:

public class SchematicProvider : UriImageProvider, ICloneable
{
    private SchematicViewModel _viewModel;
    // EPSG900913Projection is a proportional projection so should work for arbitrary units (i.e. IPSC schematic maps)
    // see http://www.telerik.com/forums/displaying-drawings-with-empty-map-provider
    private readonly EPSG900913Projection _projection = new EPSG900913Projection();

    public override ISpatialReference SpatialReference => _projection;

    public SchematicProvider(SchematicViewModel viewModel)
    {
        _viewModel = viewModel;
        var mediaFileName = viewModel.GetMediaFileName();

        var topLeft = new Location(6000, 0);
        var bottomRight = new Location(0, 8000);
        // If I don't include this line, I can't zoom in and out of the image
        // but including this line makes the app crash when I click on the minimap button
        GeoBounds = new LocationRect(topLeft, bottomRight);

        Uri = new Uri(mediaFileName);
    }

    public new object Clone()
    {
        var provider = new SchematicProvider(_viewModel);
        InheritCurrentSource(provider);
        InheritParameters(provider);
        return provider;
    }

    protected override void Dispose(bool disposing)
    {
        _viewModel = null;
        base.Dispose(disposing);
    }
}

My view model looks like this:

public class SchematicViewModel
{
    private readonly string _imageName;

    public SchematicViewModel(string imageName)
    {
        _imageName = imageName;
    }

    public string GetMediaFileName()
    {
        return _imageName;
    }
}

And the code behind looks like this:

public MainWindow()
{
    InitializeComponent();
    RadMap1.SpatialReference = new EPSG900913Projection();
    RadMap1.Provider = new SchematicProvider(new SchematicViewModel("C:\\temp\\image.png"));
    // image is 8000 wide by 6000 high and I want to position the map center on the image center
    RadMap1.Center = new Location(3000, 4000);
}

 

If I don't set the GoeBounds in the provider then I can't zoom and pan as expected. If I do set the GeoBounds then when I click the minimap button the app crashes with the following exception:

System.ArgumentException
  HResult=0x80070057
  Message=Width and Height must be non-negative.
  Source=WindowsBase
  StackTrace:
   at System.Windows.Size..ctor(Double width, Double height)
   at Telerik.Windows.Controls.Map.SpatialReference.GetSizeInKilometers(Location basePoint, Size size)
   at Telerik.Windows.Controls.Map.LocationRect.CalculateGeographicalSize()
   at Telerik.Windows.Controls.Map.TilesVisualizationLayer.CalculateRegion()
   at Telerik.Windows.Controls.Map.TilesVisualizationLayer.OnMapChanged(RadMap oldMap, RadMap newMap)
   at Telerik.Windows.Controls.Map.InformationLayer.InformationLayerLoaded(Object sender, RoutedEventArgs e)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
   at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
   at MS.Internal.LoadedOrUnloadedOperation.DoWork()
   at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at ProvidersUriImageProvider.App.Main()

 

What am I doing wrong?

Thanks

Pete

 

 

 

[Peter]

I'm not sure it's related, but with this configuration I get occasional crashes of my application with the following exception. I've not seen this crash when using Bing map provider. None of my application code seems to be in this call stack:

at Telerik.Windows.Controls.Map.MapCanvas.GetPoint(Location location)
at Telerik.Windows.Controls.Map.TilesVisualizationLayer.GetPixelSize(LocationRect rect)
at Telerik.Windows.Controls.Map.TilesVisualizationLayer.SetElementSize(TilePresenter presenter)
at Telerik.Windows.Controls.Map.TilesVisualizationLayer.MultiscaleImage_MotionFinished(Object sender, RoutedEventArgs e)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at CNL.IPSecurityCenter.WindowsClient.App.Main()

[Vladimir Stoyanov]

Hello Peter,

Thank you for the provided snippets. 

I was able to reproduce the mini map exception only when the SpatialReference of the mini map was not the same as the one of the RadMap. Can you make sure that this is not the case on your end?

Please, find a sample project attached, which I created based on the code snippets. It correctly opens the mini map on my end.

I hope that the attached project will help you in proceeding forward with your requirements.

Regards,
Vladimir Stoyanov
Progress Telerik

[Peter]

Hi Vladimir,

Thanks for the response. It seems to have solved the issue I was having. It would perhaps have been better if the minimap displayed using the built-in minimap button had it's spatial reference synchronised to the main map but I'm being picky.

Regards,
Pete