# ArrayRange

VTKExamples/Cxx/Utilities/ArrayRange

### Code

ArrayRange.cxx

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

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

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

      // Get min and max
      double range[2];
      distances->GetRange(range);
      std::cout << "range = " << range[0] << " " << range[1] << std::endl;
      }

      /////////////// Ints //////////////
      {
      vtkSmartPointer<vtkIntArray> ints =
        vtkSmartPointer<vtkIntArray>::New();
      ints->SetNumberOfComponents(1);
      ints->SetName("Ints");

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

      // Get min and max
      int valuesRange[2];
      ints->GetValueRange(valuesRange); // Note this is not GetRange()!
      std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1] << std::endl;
      }

      /////////// Range with negative values ///////////
      {
      vtkSmartPointer<vtkIntArray> ints =
        vtkSmartPointer<vtkIntArray>::New();
      ints->SetNumberOfComponents(1);
      ints->SetName("Ints");

      ints->InsertNextValue(-50);
      ints->InsertNextValue(15);
      ints->InsertNextValue(25);

      // Get min and max
      int valuesRange[2];
      ints->GetValueRange(valuesRange); // Note this is not GetRange()!
      std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1] << std::endl;
      }

      /////////// Magnitude range ///////////
      {
      vtkSmartPointer<vtkIntArray> ints =
        vtkSmartPointer<vtkIntArray>::New();
      ints->SetNumberOfComponents(1);
      ints->SetName("Ints");

      ints->InsertNextValue(-50);
      ints->InsertNextValue(15);
      ints->InsertNextValue(25);

      // Get min and max
      int valuesRange[2];
      ints->GetValueRange(valuesRange, -1);
      std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1] << std::endl;
      }
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ArrayRange)

    find_package(VTK COMPONENTS
      vtkCommonCore QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ArrayRange: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(ArrayRange MACOSX_BUNDLE ArrayRange.cxx )
      target_link_libraries(ArrayRange PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ArrayRange MACOSX_BUNDLE ArrayRange.cxx )
      target_link_libraries(ArrayRange PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ArrayRange
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ArrayRange

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

    cd ArrayRange/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:

    ./ArrayRange

WINDOWS USERS

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