// Handle selection events in the transformation picker.
private void TransformationsPicker_TransformationSelected(object sender, TransformationSelectionEventArgs e)
{
// Get the selected transform from the event arguments. Return if none is selected.
DatumTransformation selectedTransform = e.Transformation;
if (selectedTransform == null)
{
return;
}
try
{
// Project the original point using the selected transform.
MapPoint projectedPoint = (MapPoint)GeometryEngine.Project(_originalPoint, _myMapView.SpatialReference, selectedTransform);
// Update the projected graphic (if it already exists), create it otherwise.
if (_projectedPointGraphic != null)
{
_projectedPointGraphic.Geometry = projectedPoint;
}
else
{
// Create a symbol to represent the projected point (a cross to ensure both markers are visible).
SimpleMarkerSymbol projectedPointMarker = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Cross, Color.Red, 15);
// Create the point graphic and add it to the overlay.
_projectedPointGraphic = new Graphic(projectedPoint, projectedPointMarker);
_pointsOverlay.Graphics.Add(_projectedPointGraphic);
}
_messagesTextView.Text = "Projected point using transform: " + selectedTransform.Name;
}
catch (ArcGISRuntimeException ex)
{
// Exception if a transformation is missing grid files.
_messagesTextView.Text = "Error using selected transformation: " + ex.Message;
// Remove the projected point graphic (if it exists).
if (_projectedPointGraphic != null && _pointsOverlay.Graphics.Contains(_projectedPointGraphic))
{
_pointsOverlay.Graphics.Remove(_projectedPointGraphic);
_projectedPointGraphic = null;
}
}
}
/// <summary>
/// Will calculate a
/// </summary>
/// <param name="inX"></param>
/// <param name="inY"></param>
/// <returns></returns>
public MapPoint CalculateGeographicCoordinate(int easting, int northing, SpatialReference inSR, SpatialReference outSR)
{
//Variables
MapPoint geoPoint = new MapPoint(0, 0, outSR);
//Transform
if (easting != 0.0 && northing != 0.0)
{
if (outSR != null)
{
DatumTransformation datumTransfo = null;
if ((outSR.Wkid > 26900 && outSR.Wkid < 27000))
{
outSR = new Esri.ArcGISRuntime.Geometry.SpatialReference(4617);
}
else
{
datumTransfo = TransformationCatalog.GetTransformation(inSR, outSR);
}
MapPoint proPoint = new MapPoint(easting, northing, inSR);
//Validate if transformation is needed.
if (datumTransfo != null)
{
geoPoint = (MapPoint)Esri.ArcGISRuntime.Geometry.GeometryEngine.Project(proPoint, outSR, datumTransfo);
}
else
{
geoPoint = (MapPoint)Esri.ArcGISRuntime.Geometry.GeometryEngine.Project(proPoint, outSR);
}
}
}
return(geoPoint);
}
// Function to get suitable datum transformations for the specified input and output spatial references.
private void GetSuitableTransformations(SpatialReference inSpatialRef, SpatialReference outSpatialRef,
bool considerExtent)
{
// Get suitable transformations. Use the current extent to evaluate suitability, if requested.
IReadOnlyList <DatumTransformation> transformations;
if (considerExtent)
{
Envelope currentExtent =
MyMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry).TargetGeometry as Envelope;
transformations =
TransformationCatalog.GetTransformationsBySuitability(inSpatialRef, outSpatialRef, currentExtent);
}
else
{
transformations = TransformationCatalog.GetTransformationsBySuitability(inSpatialRef, outSpatialRef);
}
// Get the default transformation for the specified input and output spatial reference.
DatumTransformation defaultTransform = TransformationCatalog.GetTransformation(inSpatialRef, outSpatialRef);
List <DatumTransformationListBoxItem> transformationItems = new List <DatumTransformationListBoxItem>();
// Wrap the transformations in a class that includes a boolean to indicate if it's the default transformation.
foreach (DatumTransformation transform in transformations)
{
DatumTransformationListBoxItem item = new DatumTransformationListBoxItem(transform)
{
IsDefault = (transform.Name == defaultTransform.Name)
};
transformationItems.Add(item);
}
// Set the transformation list property that the list box binds to.
SuitableTransformationsList = transformationItems;
}
// Constructor that takes the DatumTransformation object to wrap.
public DatumTransformationListBoxItem(DatumTransformation transformation)
{
TransformationObject = transformation;
}
public TransformationSelectionEventArgs(DatumTransformation transformation)
{
Transformation = transformation;
}
// Constructor that takes the datum transformations list to display.
public TransformationsPickerModel(IReadOnlyList <DatumTransformation> transformationList, DatumTransformation defaultTransform)
{
_datumTransformations = transformationList;
_defaultTransformation = defaultTransform;
}
