[vtkusers] vtkChartXY: How to catch mouse click events, user interaction? (VTK 5.8.0)

[Natalie]

Hi Julien,

thanks a lot for your explanation. For sure, I will need specific point
selection in the future. But to start with,  I just want a right mouse
double click (if possible, if not a single click might be OK) giving a
specific action. As you said there are multiple ways of doing, which one
would you think is best? I think a double click is not really detected yet,
right?

1. I tried with AddObserver, but there was no action.
2. I subclassed vtkContextInteractorStyle to change the action and I
subcalssed vtkContextView to change the constructor as I said in my last
post. It compiles fine, but I get a runtime crash in the line
view->GetInteractor()->Start();
Here view is the subclassed vtkContextView. It crashes in the
 "vtkContextInteractorStyle::ProcessSceneEvents" method coming from
  "vtkWin32RenderWindowInteractor::Start()" in the message loop.
So far I did not find the cause. 
What is wrong???

Thanks a lot for your help! 
Natalie



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