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# DiscretizableColorTransferFunction

VTKEx/Java/Utilities/DiscretizableColorTransferFunction

### Description

vtkDiscretizableColorTransferFunction object is a cross between a vtkColorTransferFunction and vtkLookupTable selectively combining the functionality of both.

This class is a vtkColorTransferFunction allowing users to specify the RGB control points that control the color transfer function. At the same time, by setting Discretize to 1 (true), one can force the transfer function to only have NumberOfValues discrete colors.

Other languages

See (Cxx)

Question

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### Code

DiscretizableColorTransferFunction.java

    import vtk.vtkNativeLibrary;
    import vtk.vtkDiscretizableColorTransferFunction;

    public class DiscretizableColorTransferFunction
    {
      // -----------------------------------------------------------------
      // Load VTK library and print which library was not properly loaded
      static
      {
        if (!vtkNativeLibrary.LoadAllNativeLibraries())
        {
          for (vtkNativeLibrary lib : vtkNativeLibrary.values())
          {
            if (!lib.IsLoaded())
            {
              System.out.println(lib.GetLibraryName() + " not loaded");
            }
          }
        }
        vtkNativeLibrary.DisableOutputWindow(null);
      }
      // -----------------------------------------------------------------

      public static void main(String args[])
      {
       vtkDiscretizableColorTransferFunction discretizableColorTransferFunction = new vtkDiscretizableColorTransferFunction();
       discretizableColorTransferFunction.DiscretizeOn();
       discretizableColorTransferFunction.SetNumberOfValues(2);

       discretizableColorTransferFunction.AddRGBPoint(0.0, 1, 0, 0);
       discretizableColorTransferFunction.AddRGBPoint(10.0, 0, 1, 0);
       discretizableColorTransferFunction.Build();

       double color[] = new double[3];
       discretizableColorTransferFunction.GetColor(1.0, color);

       System.out.println(color[0] +" " + color[1] + " " + color[2]);

       discretizableColorTransferFunction.GetColor(5.0, color);
       System.out.println(color[0] +" " + color[1] + " " + color[2]);
      }
    }