[vtkusers] interaction problem after timer added

[David Gobbi]

Hi Gary,

I downloaded your program and confirmed your findings: if the timer
is running, then the trackball-mode rotation does not stop when the
mouse stops.

This definitely looks like a bug in VTK itself, so I don't think there
is any way for you to fix it inside your program.

Can you report it on the VTK bugtracker? (http://www.vtk.org/Bug)

 - David


On Thu, Jan 21, 2016 at 8:29 AM, gary_jia <jialei.gary at gmail.com> wrote:

> Hi everyone,
>     When I use the vtkInteractorStyleTrackballCamera, the object movement
> will stop when the mouse freezes ( with mouse button still down). After I
> added a timer, the object keep moving even when the mouse stop moving. Only
> after I release the mouse button, the movement stops.
>    Could you help to tell me how to stop the movement immediately after the
> mouse stop even with any mouse button still down when with a timer running?
>
> Thank you!
>
>   my code:
>
> #!/usr/bin/env python
> import vtk
>
> class vtkTimerCallback():
>     def __init__(self):
>         self.timer_count = 0
>
>     def execute(self,obj,event):
>         print(self.timer_count)
>         self.timer_count += 1
>
> src = vtk.vtkCubeSource()
>
> mapper = vtk.vtkPolyDataMapper()
> mapper.SetInputConnection(src.GetOutputPort())
>
> actor = vtk.vtkActor()
> actor.SetMapper(mapper)
>
> main_render = vtk.vtkRenderer()
> main_render.AddActor(actor)
>
> renWin = vtk.vtkRenderWindow()
> renWin.AddRenderer(main_render)
>
> iren = vtk.vtkRenderWindowInteractor()
> iren.SetRenderWindow(renWin)
> iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
> iren.Initialize()
>
> cb = vtkTimerCallback()
> cb.actor = actor
> iren.AddObserver('TimerEvent', cb.execute)
> timerId = iren.CreateRepeatingTimer(50);
> iren.Start()
>
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