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Home / Developer Corner / Forums / Usage issues / Question about the neutral point and local context

Question about the neutral point and local context

Question about the neutral point and local context
Shu-Fang Fan 2012/10/18 19:44
I'm new to OpenCASCADE.
What I want to do is quite simple.

1. I read a IGES file and put the everything in one shape

IGESControl_Reader reader;     
Standard_Integer Status=reader.ReadFile(filepathname);
          return Status;

     TopoDS_Shape aShape = reader.OneShape();

2. I display the objects in the viewer (in neutral point).

3. In order to select an edge, I followed the method showed in the MFC example.
     Standard_Integer local_context = myAISContext->OpenLocalContext(TRUE, TRUE, TRUE, TRUE);

4. I select an edge, and make a copy then display it.
     Handle(AIS_InteractiveContext) pAIS = GetDocument()->GetAISContext();
     if (pAIS->NbSelected()>0) //should be 1 if only one edge selected.
          BRepBuilderAPI_Copy copy_api;
          for (pAIS->InitSelected(); pAIS->MoreSelected();pAIS->NextSelected())
               TopoDS_Shape copied_shape = copy_api.Shape();
Handle(AIS_Shape) ais_shape = new AIS_Shape(copy_shape);

5. After I close the Local context (for the edge selection filter), the new shape is gone.

I know the new copied edge is in the Local context. How can I keep it into the neutral point?

Any suggestion will be appreciated!
Hans 2012/10/22 23:49
Don't know if this is the right way, there might be a better one. But this works for me: CloseAllContexts before Display(ais_shape) and your new Shape will be displayed after your 5. Step.

Shu-Fang Fan 2012/11/15 23:16
Thank you reply Hans.

I figured out the similiar way like what you suggested
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