# ColorLookupTable

VTKExamples/Cxx/Utilities/ColorLookupTable

### Description

This example shows how to create a table of colors that map from a continuous range of values.

### Code

ColorLookupTable.cxx

    #include <vtkSmartPointer.h>
    #include <vtkLookupTable.h>

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

      lookupTable->SetTableRange(0.0, 10.0);
      // If you don't want to use the whole color range, you can use
      // SetValueRange, SetHueRange, and SetSaturationRange
      lookupTable->Build();

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

      lookupTable->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(ColorLookupTable)

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

    add_executable(ColorLookupTable MACOSX_BUNDLE ColorLookupTable.cxx)

    target_link_libraries(ColorLookupTable ${VTK_LIBRARIES})

### Download and Build ColorLookupTable

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

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

    cd ColorLookupTable/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:

    ./ColorLookupTable

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.