[vtkusers] JSlider + Medical

[Jeff Lee]

Ziad Rahhal wrote:

>HI all,
>
>Can anybody tell me why the slider in the attached
>code is slow? I mean it doesn't move smoothly.
>  
>
because you are actually recalculating the isosurface whenever the 
slider state changes.  you could try
 if (!_slider.getValueIsAdjusting()) {
  skinExtractor.SetValue(0, slider.getValue());
  renWin.repaint();
}
and that will perform the calculation when you let go of the slider (not 
calculating the intermediate values).  Ideally you want the isosurfacing 
to be interactive, but it isn't, which is why your slider doesn't move 
smoothly.  There are other "smoke and mirrors" techniques you can use to 
feign responsiveness.  A better solution than the above would be to 
start a timer whenever the slider is moved.  The timer action would get 
restarted if the slider moves, but if the user stops moving it would 
actually do the isosurface extraction.
-J

>Thank you in advance,
>
>Ziad
>
>
>	
>		
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