# ArrayLookup

VTKExamples/Cxx/Utilities/ArrayLookup

### Code

ArrayLookup.cxx

    #include <vtkSmartPointer.h>
    #include <vtkFloatArray.h>
    #include <vtkIdList.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkFloatArray> distances =
        vtkSmartPointer<vtkFloatArray>::New();
      distances->SetNumberOfComponents(1);
      distances->SetName("Distances");

      distances->InsertNextValue(5);
      distances->InsertNextValue(15);
      distances->InsertNextValue(15);
      distances->InsertNextValue(25);
      distances->InsertNextValue(15);

      // Get first location
      vtkIdType result = distances->LookupValue(15);
      std::cout << "result: " << result << std::endl;

      // Get all locations
      vtkSmartPointer<vtkIdList> idList =
        vtkSmartPointer<vtkIdList>::New();
      distances->LookupValue(15, idList);
      std::cout << "found at: " << std::endl;
      for(vtkIdType i = 0; i < idList->GetNumberOfIds(); i++)
      {
        std::cout << idList->GetId(i) << " ";
      }

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ArrayLookup)

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

    add_executable(ArrayLookup MACOSX_BUNDLE ArrayLookup.cxx )

    target_link_libraries(ArrayLookup ${VTK_LIBRARIES})

### Download and Build ArrayLookup

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

    cd ArrayLookup/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:

    ./ArrayLookup

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.