private void OnPreviewLeftMouseDown(object sender, MouseButtonEventArgs e)
{
Point mouseScreenPoint = e.GetPosition(mapControl).ToMapsui();
var draggingFeature = GetFeaturesAtScreenPoint(mouseScreenPoint).OfType <DraggingFeature>().FirstOrDefault();
if (draggingFeature == null && insertionPreviewFeature != null)
{
int insertedIndex = insertionPreviewFeature.Index;
Point insertedVertex = insertionPreviewFeature.Vertex;
draggingFeature = InsertVertex(insertedIndex, insertedVertex);
draggingLayer.TryRemove(insertionPreviewFeature);
insertionPreviewFeature = null;
}
if (draggingFeature != null)
{
// Preventing map panning
e.Handled = true;
this.draggingFeature = draggingFeature;
Point mouseWorldPoint = ScreenPointToGlobal(mouseScreenPoint);
draggingOffset = mouseWorldPoint - draggingFeature.Vertex;
return;
}
}
private DraggingFeature InsertVertex(int index, Point vertex)
{
DraggingFeature draggingFeature;
editedObject.Vertices.Insert(index, vertex);
draggingFeature = new DraggingFeature(editedObject, vertex);
draggingLayer.Add(draggingFeature);
draggingLayer.Refresh();
return(draggingFeature);
}
private void OnPreviewLeftMouseUp(object sender, MouseButtonEventArgs e)
{
draggingFeature = null;
}