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<DIV><FONT size=2 face=Arial>Hi Steve,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>You may find it simpler to check for an interrupt
after rendering each frame. There has been some discussion on this recently in
the list.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>HTH</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>John.</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=stevec@renci.org href="mailto:stevec@renci.org">Steve Chall</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=jerome.velut@gmail.com
href="mailto:jerome.velut@gmail.com">'Jérôme'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=vtkusers@vtk.org
href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, October 29, 2009 5:31
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [vtkusers] Starting an
animation with a keypress,terminating with another keypress</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt">Jérôme,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt">Yes, precisely: I need to create
a new thread to do the animation, and interrupt that thread on the appropriate
keypress. Googling “vtk thread” now.
Thanks.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt">-Steve<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN
style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
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face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center SIZE=3 width="100%">
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN
style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT
size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> Jérôme
[mailto:jerome.velut@gmail.com] <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, October 29, 2009 12:47
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Steve
Chall<BR><B><SPAN style="FONT-WEIGHT: bold">Cc:</SPAN></B> <A
href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</A><BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [vtkusers] Starting an
animation with a keypress, terminating with another
keypress</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><FONT size=3
face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Hi, <BR>I think that the
source of your problem is that when you press 'a', you enter an infinite loop
from your main thread. You should call your Animate() function from another
thread. I remember that VTK has built-in thread manager classes. It could be a
solution.<BR><BR>Hope that helps.<BR>Jerome<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt">2009/10/29 Steve Chall <<A
href="mailto:stevec@renci.org">stevec@renci.org</A>><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt">Dear fellow VTK enthusiasts:<BR>I'd like to trigger an
animation from a keypress event, and then stop the<BR>animation with the same
keypress event. I've subclassed<BR>vtkInteractorStyleTrackballCamera
with an OnKeyPress() method that looks a<BR>lot like what's included below.
When the user presses a
key,<BR>myInteractorStyleTrackballCamera::OnKeyPress() is invoked, which (for
the<BR>selected key, say 'a') toggles myObject's isAnimating Boolean flag.
If<BR>after toggling the flag is true, I want to start an animation
loop. If<BR>after toggling it's false, I want to stop that same loop.
But once I start<BR>the loop I can't penetrate with another 'a' keypress
(or anything else other<BR>than a <Ctrl-C>) to change the flag back to
false and thus stop the loop.<BR>How can I interrupt the "while (isAnimating)"
loop once it starts?<BR><BR>(I've also subclassed vtkRenderWindowInteractor
because its Start() function<BR>seems like a place for interrupts, but I don't
know what to do with it.)<BR><BR>Thanks for any help you may be able to
provide.<BR><BR>-Steve Chall<BR> Senior Research Software
Developer<BR> Renaissance Computing Institute<BR> Phone:
919-515-0051<BR> Email: <A
href="mailto:stevec@renci.org">stevec@renci.org</A><BR><BR>// Pseudo C++
source code segments
follow:<BR><BR>...<BR>myClass::Animate()<BR>{<BR> while
(isAnimating)<BR> {<BR>
this->RenderNextFrame();<BR> }<BR>}<BR>...<BR><BR>myClass
*myObject = new myClass;<BR><BR>...<BR>void
myInteractorStyleTrackballCamera::OnKeyPress()<BR>{<BR> switch
(this->Interactor->GetKeyCode())<BR> {<BR> case
'a':<BR> case 'A':<BR> if (myObject)<BR>
{<BR> myObject->isAnimating =
!(myObject->isAnimating);<BR><BR> if
(myObject->isAnimating)<BR> {<BR>
myObject->Animate();<BR>
}<BR>/* This is sort of what I'd like to do:<BR>
else<BR> {<BR>
myObject->StopAnimating();<BR> }<BR>
}<BR>*/<BR> break;<BR><BR>
default:<BR>
break;<BR> }<BR><BR> vtkInteractorStyleTrackballCamera::OnKeyPress();<BR>}<BR><BR><BR><BR><BR>_______________________________________________<BR>Powered
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV>
<P>
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