[vtkusers] TimerEvents not fired while dragging mouse in vtkRenderWindow

[Ken Martin]

I suspect timer events are fired but something else is consuming them.
Probably in the interactor style. Try adding your timer events with a
higher priority like 10.0 (third argument).

On Mon, Nov 13, 2017 at 3:21 PM, Kolja Petersen <petersenkolja at gmail.com>
wrote:

> Heya,
> I paste some code below, which displays an empty vtkRenderWindow with an
> interactor. The interactor fires a TimerEvent every 100ms as printed by the
> Observer.
> The problem: as long as I press a mouse button in the vtkRenderWindow, the
> TimerEvents stop to be reported, although I need to process data
> periodically in my application as a reaction to those TimerEvents.
>
> Why are no TimerEvents fired while a button is pressed, and how can I
> change this behaviour?
> Thank you
> Kolja
>
> import vtk
>
> class Observer(object):
>   def __init__(self):
>     self.cnt=0
>   def __call__(self,caller,evt):
>     self.cnt+=1
>     print "count %d %s" % (self.cnt,evt)
>
> ren1 = vtk.vtkRenderer()
> ren1.SetBackground(0.1, 0.2, 0.4)
>
> renWin = vtk.vtkRenderWindow()
> renWin.AddRenderer(ren1)
> renWin.SetSize(300, 300)
>
> iren = vtk.vtkRenderWindowInteractor()
> iren.SetRenderWindow(renWin)
>
> style = vtk.vtkInteractorStyleTrackballCamera()
> iren.SetInteractorStyle(style)
>
> iren.Initialize()
> observer=Observer()
> iren.AddObserver(vtk.vtkCommand.TimerEvent,observer)
> iren.AddObserver(vtk.vtkCommand.MouseMoveEvent,observer)
> iren.AddObserver(vtk.vtkCommand.InteractionEvent,observer)
> iren.CreateRepeatingTimer(100)
> iren.Start()
>
>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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