[vtkusers] How to draw a vtkBorderWidget object by mouse clicking the points

[Liu_tj]

Hi,


Usually when we use the vtkBorderWidget, we will set the two point postions. Now I want to generate the vtkBorderWidget when mouse selects the point on the rendering window, how to do that?

I call AddObserver() for vtkCommand::StartInteractionEvent and it doesn't work. This event will be triggered when the borderwidget is selected. But now for me, the widget is not generated yet. 



Thanks
Liu Peng
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