# ColorTransferFunction

VTKExamples/Cxx/Utilities/ColorTransferFunction

### Description

This example demonstrates how to map the values (0.0 to 10.0) to the colors (red to green).

### Code

ColorTransferFunction.cxx

    #include <vtkSmartPointer.h>
    #include <vtkColorTransferFunction.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkColorTransferFunction> colorTransferFunction =
        vtkSmartPointer<vtkColorTransferFunction>::New();

      colorTransferFunction->AddRGBPoint(0.0, 1, 0, 0);
      colorTransferFunction->AddRGBPoint(10.0, 0, 1, 0);

      double color[3];
      colorTransferFunction->GetColor(1.0, color);
      std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

      colorTransferFunction->GetColor(5.0, color);
      std::cout << color[0] << " " << color[1] << " " << color[2] << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ColorTransferFunction)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(ColorTransferFunction MACOSX_BUNDLE ColorTransferFunction.cxx )

    target_link_libraries(ColorTransferFunction ${VTK_LIBRARIES})

### Download and Build ColorTransferFunction

Click here to download ColorTransferFunction and its CMakeLists.txt file. Once the tarball ColorTransferFunction.tar has been downloaded and extracted,

    cd ColorTransferFunction/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./ColorTransferFunction

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.