[vtkusers] Swing Based vtkPanel

[Jeff Lee]

It works fine for me - on win2000, SunOS, linux.  I have never heard of 
this problem before on win2k systems.  What are your details - os, vtk 
version, etc...  I added the lock/unlock mechanism to allow native code 
to call render/makeCurrent/other calls which affect the drawing surface.
-Jeff

anast.jm at pg.com wrote:

>Satheesh....I'm not even getting that far with SimpleVTK......the window and
>button display okay but even if I do nothing the app crashes in 1 sec...just too
>new to figure this out on my own...john
>
>An unexpected exception has been detected in native code outside the VM.
>Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x77f67616
>Function name=RtlLeaveCriticalSection
>Library=C:\WINNT\System32\ntdll.dll
>
>Current Java thread:
>        at vtkPanel.UnLock(Native Method)
>        at vtkPanel.Render(vtkpanel.java:82)
>        at vtkPanel.paint(vtkpanel.java:90)
>        at sun.awt.RepaintArea.paint(Unknown Source)
>        at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
>        at java.awt.Component.dispatchEventImpl(Unknown Source)
>        at java.awt.Component.dispatchEvent(Unknown Source)
>        at java.awt.EventQueue.dispatchEvent(Unknown Source)
>        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
>
>        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
>        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
>        at java.awt.EventDispatchThread.run(Unknown Source)
>
>
>                                                                
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>
>From: Satheesh Maheswaran <s.maheswaran at eastman.ucl.ac.uk>@public.kitware.com on
>03/05/2002 03:23 PM GMT
>                                                                                                          
>                                 Satheesh Maheswaran           To:   "Gopalakrishnan, Gowri"              
> <s.maheswaran at eastman.ucl.ac.uk>@public.kitware.com        <Gowri.Gopalakrishnan at inteq.com>              
>                                                               Cc:   "'da5y-ngmn at asahi-net.or.jp'"        
>                                                            <da5y-ngmn at asahi-net.or.jp>,                  
>         Sent by:  vtkusers-admin at public.kitware.com        vtkusers at public.kitware.com (bcc: John        
>                                 03/05/2002 10:23 AM        Anast-JM/PGI)                                 
>                                                       Subject:      Re: [vtkusers] Swing Based vtkPanel  
>                                                                                                          
>                                                                                                          
>
>
>
>
>hello users
>
>I am trying to get vtkPanel.java work with SimpleVTK.java given with VTK. Its in
>vtk/wrapping/java
>
>All works, and the panel gets displayed with cone and an exit button.  Here awt
>and swing
>components are mixed, and the vtkPanel.java extends Canvas, which I think is
>awt.
>
>So when i run it and try to interact with it, all key events work and the exit
>button work,
>but when trying the mouse events. like zooming, it crashes :)
>
>has anyone come across the same problem !!! or may be even a solution for the
>problem !!
>
>satheesh
>
>"Gopalakrishnan, Gowri" wrote:
>
>>If you look in the sun's web site on JNI (java native interface) and the
>>native code for vtkPanel.java you will see that they are quite identical.
>>It used to be that you could grab drawing surface information and the window
>>handle only from canvas (it is a undocumented codes in jdk). But I have come
>>across something similar in Swing. In vtk 3.2 it is done using canvas, but
>>in vtk4.0 I do not know. You cannot use anything else other than canvas (now
>>a swing component - I forgot which )to get this information from sun's jdk.
>>
>>Also with your swing problem - even if you got it to work now you might end
>>up with strange behaviours in swing components when they are put on the awt
>>component. Event handling especially can be troublesome. If you have not
>>done too much dev. already it is a good/wise idea to change to completely
>>swing. Mixing awt and swing leads to frustration.
>>
>>Gowri
>>
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