[vtkusers] How to use "IsTypeOf "?

[N Smethurst]

If you think you should have a specific type of object but your code isn't 
doing what you think it should, you could sprinkle code like

std::cout << "Class name = " << m_Picker->GetClassName() << std::endl;

whereever it would be useful to see if your object is what you think it is.  
Try something like

if (m_Picker->GetCellId()>=0)
     {
          std::cout << "Class name = " << m_Picker->GetClassName() 
                    << std::endl;

          if (m_Picker->IsTypeOf("vtkTriangle")==1)
               str.Format(_T("Triangle ID = %d"),m_Picker->GetCellId());
          if (m_Picker->IsTypeOf("vtkLine")==1) 
               str.Format(_T("Line ID = %d"),m_Picker->GetCellId());
          AfxMessageBox(str);
     }

then you can easily debug your code.

Are you sure you want to inherit from vtkInteractorStyleUser? I was under the 
impression that this class was specifically designed for passing it function 
pointers instead of needing to subclass.

For sending messages around, maybe you could create a class derived from 
vtkCommand?

Nic