How to change/highlight elements?

[leuyvo]

Hello,

I'm using XbimWindowsUI to build Winform 3D View from ifc file. Now I want to highlight some elements, I wonder is it possible and how to do it?

(Similiar to this: http://docs.xbim.net/XbimWebUI/tutorial-5_Colourful_building.html)

Thank you.

[andyward]

There's no particular sample docs for this apart from how Xbim Xplorer does it. Note that most of the implementation is in the re-usable Xbim.Presentation library (in DrawingControl.xaml)

I'd take a look at https://github.com/xBimTeam/XbimWindowsUI/blob/87e33a9f61469caa7a8a8af81a33eb7a97e8f943/Xbim.Presentation/DrawingControl3D.xaml.cs#L958

... and work your way up from there.

Note this also supports multiple selection.

[SpacePurr]

Hello.

DrawingControl3D have protected method HighlighSelected. Create your own DrawingControl3D and new method with protected method HighlighSelected

public class MyDrawingControl3D : DrawingControl3D
{
     public void HighlightS(IPersistEntity ent)
     {
         HighlighSelected(ent);
     }   

     private XbimRect3D _viewBounds
     {
         get
         {
             return ModelPositions.ViewSpaceBounds;
         }
     }

     public void Zoom()
     {
         if (SelectedEntity == null || Highlighted.Content == null || Highlighted.Content.Bounds.IsEmpty)
             return;
         var r3D = Highlighted.Content.Bounds;
         MyZoomTo(r3D);
     }

     private void MyZoomTo(Rect3D r3D)
     {
         if (r3D.IsEmpty)
             return;
         var bounds = new Rect3D(
             _viewBounds.X, _viewBounds.Y, _viewBounds.Z,
             _viewBounds.SizeX, _viewBounds.SizeY, _viewBounds.SizeZ
             );

         if (r3D.IsEmpty)
             return;
         var actualZoomBounds = r3D.Contains(bounds) ? bounds : r3D;
         Viewport.ZoomExtents(actualZoomBounds, 500);
     }
}

Now, call this in your viewmodel

DrawingControl.Dispatcher.Invoke(() =>
                {      
                    DrawingControl.Selection = SelectedEntities;
                    DrawingControl.HighlightS(SelectedEntities.First());
                    DrawingControl.ModelOpacity = 0.1;
                    Thread.Sleep(100);
                    DrawingControl.Zoom();
                });

where DrawingControl is your object of type MyDrawingControl3D, SelectedEntities is your EntityCollection.

I'm still new, but it works for me. GoodLuck :)

[AllanCrow]

I have adopted the above code by SapcePurr and then manipulated it by introducing a DataGrid. Each row of the DataGrid has a bunch of objects (mixed properties) behind it. I can get the model to highlight multiple objects (selected from the DataGrid) but when it is more than a few dozen it becomes painfully slow and even throws up a memory problem.

Any ideas on how to speed it up or a different approach to 'grouping' the objects so they can be highlighted at once? Am willing to consider feeding the grouping components model from say MySql