[vtkusers] trying to use vtk with java

[Frederic Kleinermann]

Hi,

I am trying to use vtk with java. So far, I cannot make a simple example
using VTK working with java. I have managed to compile the library vtk
under java. I have managed to compile vtkPanel.java. Now I have tried to
run a simple example :


import vtk.*;

public class TestVTK {
	
      public static void main ( String args[] )
       {
 	 			
           vtkPanel panel = new vtkPanel();
 		 	 		 	
           vtkConeSource cone=new vtkConeSource();
           cone.SetResolution(8);
           vtkPolyDataMapper coneMapper=new vtkPolyDataMapper();
           coneMapper.SetInput(cone.GetOutput());
           vtkActor coneActor=new vtkActor();
           coneActor.SetMapper(coneMapper);
           panel.setActor(coneActor);
 		 	
        } 
}

When I type the command : java TestVTK , it complains saying :


Exception in thread "main" java.lang.NullPointerException:
	at vtkPanel.getWindowID(vtkPanel.java:59)
	at vtkPanel.getWindowInfo(vtkPanel.java:83)
	at vtkPanel.Render(vtkPanel.java:115)
	at vtkPanel.setActor(vtkPanel.java:32)
	at TestVTK.main(TestVTK.java:18)


it seems that the problem comes from the following three lines in
vtkPanel.java :


  Win32DrawingSurface wds =
  (Win32DrawingSurface)surfaceInfo.getSurface();
  int hWnd = wds.getHWnd();

I have also tried to run it from an applet like this :

import vtk.*;
import java.applet.Applet;
import java.awt.Graphics;

public class TestVTK extends Applet{
	
      public static void main ( String args[] )
       {
 	 			
           vtkPanel panel = new vtkPanel();
 		 	 		 	
           vtkConeSource cone=new vtkConeSource();
           cone.SetResolution(8);
           vtkPolyDataMapper coneMapper=new vtkPolyDataMapper();
           coneMapper.SetInput(cone.GetOutput());
           vtkActor coneActor=new vtkActor();
           coneActor.SetMapper(coneMapper);
           panel.setActor(coneActor);
 		 	
        } 
}

using the command 

apletviewer TestVTK


The problem is that the appletviewer appears. But there is no cone which
is rendered.

I wonder if someone had a similar problem. Since I am not very
experienced with java, I will be very interested to know how to solve
that problem.


Thanks.
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