/// <summary>
/// Called when the OnToolMouseDown event is handled. Allows the opportunity to perform asynchronous operations corresponding to the event.
/// </summary>
protected override Task HandleMouseDownAsync(MapViewMouseButtonEventArgs e)
{
//Get the instance of the ViewModel
var vm = OverlayEmbeddableControl as EmbeddedControlViewModel;
if (vm == null)
{
return(Task.FromResult(0));
}
//Get the map coordinates from the click point and set the property on the ViewModel.
return(QueuedTask.Run(() =>
{
var mapPoint = ActiveMapView.ClientToMap(e.ClientPoint);
var coords = GeometryEngine.Project(mapPoint, SpatialReferences.WGS84) as MapPoint;
if (coords == null)
{
return;
}
var sb = new StringBuilder();
sb.AppendLine($"X: {coords.X:0.000}");
sb.Append($"Y: {coords.Y:0.000}");
if (coords.HasZ)
{
sb.AppendLine();
sb.Append($"Z: {coords.Z:0.000}");
}
vm.Text = sb.ToString();
}));
}
private Task <Tuple <IDisposable, long> > AddFeatureToOverlay(MapViewMouseEventArgs e)
{
return(QueuedTask.Run(() => {
double llx = e.ClientPoint.X - 3;
double lly = e.ClientPoint.Y - 3;
double urx = e.ClientPoint.X + 3;
double ury = e.ClientPoint.Y + 3;
EnvelopeBuilder envBuilder = new EnvelopeBuilder(ActiveMapView.ClientToMap(new Point(llx, lly)),
ActiveMapView.ClientToMap(new Point(urx, ury)));
MapPoint mp = ActiveMapView.ClientToMap(e.ClientPoint);
var cursor = _trees.Search(new SpatialQueryFilter()
{
FilterGeometry = envBuilder.ToGeometry(), SpatialRelationship = SpatialRelationship.Intersects
});
if (cursor.MoveNext())
{
return new Tuple <IDisposable, long>(
ActiveMapView.AddOverlay(ActiveMapView.ClientToMap(e.ClientPoint),
_overlaySymbol.MakeSymbolReference()),
cursor.Current.GetObjectID());
}
//var select = _trees.Select(new SpatialQueryFilter() {
// FilterGeometry = envBuilder.ToGeometry(),
// SpatialRelationship = SpatialRelationship.Intersects
//});
//if (select.GetCount() > 0) {
// return ActiveMapView.AddOverlay(ActiveMapView.ClientToMap(e.ClientPoint), _overlaySymbol.MakeSymbolReference());
//}
return new Tuple <IDisposable, long>(null, -1);
}));
}
protected override void OnToolMouseMove(MapViewMouseEventArgs e)
{
if (_active)
{
QueuedTask.Run(() =>
{
_counter++;
if (_counter % 10 == 0)
{
MapView.Active.LookAtAsync(ActiveMapView.ClientToMap(e.ClientPoint), new TimeSpan(0, 0, 0, 0, 15));
_counter = 0;
}
});
}
e.Handled = true;
}
protected override void OnToolMouseMove(MapViewMouseEventArgs e)
{
if (_selectedRaster == null)
{
return;
}
// bIsMouseMoveActive is preventing the creation of too many threads via QueuedTask.Run
// especially if imagery is via a remote service
if (bIsMouseMoveActive)
{
return;
}
bIsMouseMoveActive = true;
System.Diagnostics.Debug.WriteLine($@"{DateTime.Now} OnToolMouseMove");
QueuedTask.Run(() =>
{
try
{
// create a pixelblock representing a 3x3 window to hold the raster values
var pixelBlock = _selectedRaster.CreatePixelBlock(3, 3);
// determine the cursor position in mapping coordinates
var clientCoords = new System.Windows.Point(e.ClientPoint.X, e.ClientPoint.Y);
if (clientCoords == null || ActiveMapView == null)
{
return;
}
var mapPointAtCursor = ActiveMapView.ClientToMap(clientCoords);
if (mapPointAtCursor == null)
{
return;
}
// create a container to hold the pixel values
Array pixelArray = new object[pixelBlock.GetWidth(), pixelBlock.GetHeight()];
// reproject the raster envelope to match the map spatial reference
var rasterEnvelope = GeometryEngine.Instance.Project(_selectedRaster.GetExtent(), mapPointAtCursor.SpatialReference);
// if the cursor is within the extent of the raster
if (GeometryEngine.Instance.Contains(rasterEnvelope, mapPointAtCursor))
{
// find the map location expressed in row,column of the raster
var pixelLocationAtRaster = _selectedRaster.MapToPixel(mapPointAtCursor.X, mapPointAtCursor.Y);
// fill the pixelblock with the pointer location
_selectedRaster.Read(pixelLocationAtRaster.Item1, pixelLocationAtRaster.Item2, pixelBlock);
if (_bandindex != -1)
{
// retrieve the actual pixel values from the pixelblock representing the red raster band
pixelArray = pixelBlock.GetPixelData(_bandindex, false);
}
}
else
{
// fill the container with 0s
Array.Clear(pixelArray, 0, pixelArray.Length);
}
// pass the pass the raster values to the view model
RasterValuesPaneViewModel.Current.RasterValues = ConvertArray(pixelArray);
}
finally
{
bIsMouseMoveActive = false;
}
});
}