// 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); // Create a list of transformations. List <DatumTransformation> transformsList = new List <DatumTransformation>(); foreach (DatumTransformation transformation in transformations) { transformsList.Add(transformation); } // Create an adapter for showing the spinner list. TransformationsAdapter transformationsAdapter = new TransformationsAdapter(this, transformsList); transformationsAdapter.DefaultTransformation = defaultTransform; // Apply the adapter to the spinner. _transformationsPicker.Adapter = transformationsAdapter; }
private void TransformationsPicker_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e) { // Get the selected transform from the spinner. Return if none is selected. TransformationsAdapter adapter = _transformationsPicker.Adapter as TransformationsAdapter; DatumTransformation selectedTransform = adapter[e.Position]; 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; } } }