Similar using class "vtkImageTracerWidget implementation for free" circle, how to implement rules with graphics such as ellipse, rectangle to circle take interest area, should use what kind of, a great god solve

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VtkInteractorStyleRubberBandPick vtkAreaPicker can realize rectangular box to choose, elliptical, I recently are trying to find, to beg,

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Hello, I want to ask next have specific example? With these two functions?