[vtkusers] Re: timer example

[Dominik Szczerba]

Hi Goodwin,
So where is a vtkHover widget in your codelet? It is pretty much what I had myself
 - with an exception of Initialize() first not being called at all, then being called in a wrong place
(before setRenderWindow). Then there was a typo in my code, using a vtkRenderer in place
of RenderInteractor. So 3 words, not one as I stated. You guys saved me out of quite some
frustration.
Thanks a lot,
Dominik

On Thursday 09 November 2006 18:28, Goodwin Lawlor wrote:
> Dominik Szczerba wrote:
> > According to the docu, the vtkHoverWidget is used to invoke an event when 
> > hovering in a render window. Do you propose to use a zero threshold to 
> > simulate an idle function? That sounds like an overkill for what I need. Iren 
> > allows for timers, is there really no way to regularly trigger arbitrary 
> > commands just like iren->AddObserver(vtkCommand::MouseMoveEvent, myCommand) 
> > does on a mouse movement?
> 
> Hi Dominik,
> 
> I meant vtkHoverWidget is the only that uses a repeating timer at the 
> moment. Here a (slightly buggy) but quick tcl example to illustrate:
> 
> package require vtk
> wm withdraw .
> 
> set val 10
> 
> vtkTextActor txt
>    txt SetInput $val
>    txt SetMinimumSize 100 100
>    txt ScaledTextOn
> 
> vtkRenderer ren
>    ren AddActor txt
> 
> vtkRenderWindow renwin
>    renwin AddRenderer ren
> 
> vtkRenderWindowInteractor iren
>    iren SetRenderWindow renwin
>    iren Initialize
> 
>    iren CreateRepeatingTimer 1000
>    iren AddObserver TimerEvent {if {$val == 0} exit}
>    iren AddObserver TimerEvent {txt SetInput [incr val -1]; txt 
> Modified; renwin Render}
> 
> hth
> 
> Goodwin
> 
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-- 
Dominik Szczerba, Ph.D.
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi
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