public static AreaBaseShape[] SubtractAreas(IEnumerable <Feature> features)
{
AreaBaseShape[] polygons = features.Select(f => f.MakeValidUsingSqlTypes().GetShape())
.OfType <AreaBaseShape>()
.Select(s => s.ToPolygonOrMultiPolygon()).ToArray();
for (int i = 0; i < polygons.Length; i++)
{
AreaBaseShape firstLoopShape = polygons[i];
for (int j = i + 1; j < polygons.Length; j++)
{
AreaBaseShape secondLoopShape = polygons[j];
var tempSharp = firstLoopShape.GetDifference(secondLoopShape);
if (tempSharp != null)
{
firstLoopShape = tempSharp;
}
}
if (firstLoopShape != null)
{
polygons[i] = firstLoopShape;
}
}
return(polygons);
}
private void trackOverlay_TrackEnded(object sender, TrackEndedTrackInteractiveOverlayEventArgs e)
{
//Gets the shape from the tracked polygon. The tracked shapes can be found in the TrackShapeLayer of the TrackOverlay.
AreaBaseShape areaBaseShape = (AreaBaseShape)winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape();
//Gets the features of the counties that are completely within the tracked polygon.
LayerOverlay layerOverlay = (LayerOverlay)winformsMap1.Overlays["LayerOverlay"];
ShapeFileFeatureLayer shapeFileFeatureLayer = (ShapeFileFeatureLayer)layerOverlay.Layers["CountiesLayer"];
Collection <Feature> features = shapeFileFeatureLayer.QueryTools.GetFeaturesWithin(areaBaseShape, ReturningColumnsType.NoColumns);
//Adds the shape of the selected counties features to AreaBaseShape collection to perform the Union.
Collection <AreaBaseShape> areaBaseShapes = new Collection <AreaBaseShape>();
foreach (Feature feature in features)
{
areaBaseShapes.Add((AreaBaseShape)feature.GetShape());
}
MultipolygonShape unionMultipolygonShape = MultipolygonShape.Union(areaBaseShapes);
//Gets the MultiPolygonShape with the inner ring(s) being the result of the Union of the selected shapes.
MultipolygonShape resultMultiPolygonShape = areaBaseShape.GetDifference(unionMultipolygonShape);
//Adds the result to the InMemoryFeatureLayer for display on the map.
LayerOverlay dynamicOverlay = (LayerOverlay)winformsMap1.Overlays["DynamicOverlay"];
InMemoryFeatureLayer inMemoryFeatureLayer = (InMemoryFeatureLayer)dynamicOverlay.Layers["DynamicLayer"];
inMemoryFeatureLayer.InternalFeatures.Clear();
inMemoryFeatureLayer.InternalFeatures.Add(new Feature(resultMultiPolygonShape));
//We clear the tracked shape so that it does not show on the map.
winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();
winformsMap1.Refresh(winformsMap1.Overlays["DynamicOverlay"]);
}
private void btnDifference_Click(object sender, RoutedEventArgs e)
{
InMemoryFeatureLayer inMemoryLayer = (InMemoryFeatureLayer)mapView.FindFeatureLayer("InMemoryFeatureLayer");
if (inMemoryLayer.InternalFeatures.Count > 1)
{
AreaBaseShape sourceShape = (AreaBaseShape)inMemoryLayer.InternalFeatures["AreaShape2"].GetShape();
AreaBaseShape targetShape = (AreaBaseShape)inMemoryLayer.InternalFeatures["AreaShape1"].GetShape();
AreaBaseShape resultShape = sourceShape.GetDifference(targetShape);
inMemoryLayer.InternalFeatures.Clear();
inMemoryLayer.InternalFeatures.Add("ResultFeature", new Feature(resultShape.GetWellKnownBinary(), "ResultFeature"));
inMemoryLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.FillBrush = new GeoSolidBrush(GeoColor.FromArgb(100, GeoColors.Blue));
mapView.Overlays["InmemoryOverlay"].Refresh();
}
}
private void DifferenceButtonClick(object sender, EventArgs e)
{
LayerOverlay inMemoryOverlay = (LayerOverlay)androidMap.Overlays["InMemoryOverlay"];
InMemoryFeatureLayer inMemoryLayer = (InMemoryFeatureLayer)inMemoryOverlay.Layers["InMemoryFeatureLayer"];
if (inMemoryLayer.InternalFeatures.Count > 1)
{
AreaBaseShape sourceShape = (AreaBaseShape)inMemoryLayer.InternalFeatures["AreaShape2"].GetShape();
AreaBaseShape targetShape = (AreaBaseShape)inMemoryLayer.InternalFeatures["AreaShape1"].GetShape();
AreaBaseShape resultShape = sourceShape.GetDifference(targetShape);
inMemoryLayer.InternalFeatures.Clear();
inMemoryLayer.InternalFeatures.Add("ResultFeature", new Feature(resultShape.GetWellKnownBinary(), "ResultFeature"));
inMemoryLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.FillSolidBrush.Color = GeoColor.FromArgb(100, GeoColor.StandardColors.Blue);
androidMap.Overlays["InMemoryOverlay"].Refresh();
}
}