[vtkusers] vtkProgrammableSource example written in C++ or Java

[da5y at k2.dion.ne.jp]

Hello Jarek and vtk users

The sample source was useful for me.
Thank you for your attention.

I make my test code using vtkProgrammableSource by drawing upon
your example.

In my code, an outputdata is vtkStructuredPoints so 
i extract output from GetStructuredPointsOutput.

Here is a core of my test code:

    static class SphereSrc extends vtkProgrammableSource
    {
        void run()
        {
          vtkStructuredPoints source = GetStructuredPointsOutput();
          source.SetDimensions(26,26,26);
          source.SetOrigin(-0.5,-0.5,-0.5);
          float sp = 1.0F/25.0F;
          source.SetSpacing(sp, sp, sp);

          vtkFloatArray scalars = new vtkFloatArray();
          scalars.SetNumberOfComponents(1);
          scalars.SetNumberOfTuples(26*26*26);
          for (int k=0; k<26; k++)
          {
             double z = -0.5 + k*sp;
             int kOffset = k * 26 * 26;
             for (int j=0; j<26; j++) 
             {
                 double y = -0.5 + j*sp;
                 int jOffset = j * 26;
                 for (int i=0; i<26; i++) 
                 {
                   double x = -0.5 + i*sp;
                   double s = x*x + y*y + z*z - (0.4*0.4); //(x^2 +y^2 +z^2) - R^2 // 
                   int offset = i + jOffset + kOffset;
                   scalars.SetComponent(offset,0,s);
                }
             }
          }
           source.GetPointData().SetScalars(scalars);
        }
    }

(I attempt the whole java source file for reference.)

My question is that: When I run my class, the vtkContourFilter warns and
displays "No Data is input" , then Nothing is diplayed on the window.
I guess the reason is that the setting of vtkStructuredPoints go wrong.

I want to know the how to set the data to StructuredPoints.
Does anybody know it?

Thanks in advance
----------------------
Yoshihiko

> Yoshihiko:
> 
> Here is an example in Java. vtkProgrammableSource is used to generate
> points on a cylinder. The pipeline is created in setupPipeline() method,
> the first four lines maybe of most interest to you, output is extracted
> from the source, in this case, with GetPolyDataOutput(). Here is the
> definition of the source from the example (see attached file for the
> rest):
> 
>     static class MyDataSource extends vtkProgrammableSource {
>         void run() {
>             // Get reference to output data
>             vtkPolyData output = GetPolyDataOutput();
>             // Create data points on a cylinder
>             vtkPoints points = new vtkPoints();
>             for (double z = 10D; z < (double) 100; z += 10) {
>                 for (double t = 0.0D;
>                      t < 6.2831853071795862D;
>                      t += 0.062831853071795868D) {
>                     double x = (double) 25 * Math.sin(t);
>                     double y = (double) 30 * Math.cos(t);
>                     points.InsertNextPoint(x, y, z);
>                 }
>             }
>             // Set output data
>             output.SetPoints(points);
>         }
>     }
> 
> Jarek
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