[vtkusers] No redraw of vtkCanvas

[Thomas Obenaus]

Thomas Obenaus wrote:
> Hi all vtk users,
>
> I'm currently using VTK 5.2 over Java. I have an annoying problem with 
> the redrawing-mechanism of the vtkCanvas. In my application I have 4 
> vtkPanels, each holds one vtkCanvas. Every time a canvas has lost the 
> focus and then gets partially overlaped by a JMenu or JMenuItem the 
> content of the canvas won't be redrawn.  To trac down the problem I 
> have inserted a System.err.println("rendering"); in the Render-method 
> of the vtkPanel right before the rw.Render()-call. Using this 
> modification the rw.Render()-method is called as expected (every time 
> the JMenu overlaps the canvas/ panel) but the content of the canvas is 
> not repainted anyway.
>
> I have attached two screenshots to demonstrate the problem.
>
> I Hope someone can help me. Thanks in advance.
>
> Regards,
> Thomas.
>
> ------------------------------------------------------------------------

Ok I have found the solution.
Using the parameters -Dsun.java2d.ddoffscreen=false 
-Dsun.java2d.gdiblit=false to configure the JVM eliminates the problem.

Thomas.