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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks, John. You’re right, there
has been discussion on this in the list, and not just recently.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> John Platt
[mailto:jcplatt@dsl.pipex.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, October 29, 2009
2:27 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Steve Chall; 'Jérôme'<br>
<b><span style='font-weight:bold'>Cc:</span></b> vtkusers@vtk.org<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:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Steve,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family: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.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>HTH</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>John.</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 3.0pt;
margin-left:3.0pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:stevec@renci.org" title="stevec@renci.org">Steve Chall</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jerome.velut@gmail.com" title="jerome.velut@gmail.com">'Jérôme'</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Cc:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:vtkusers@vtk.org" title="vtkusers@vtk.org">vtkusers@vtk.org</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Thursday, October
29, 2009 5:31 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re: [vtkusers]
Starting an animation with a keypress,terminating with another keypress<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Jérôme,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>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-size:10.0pt;
font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> 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:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>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:
12.0pt'>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:
12.0pt'>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>
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