# 2DArray

VTKExamples/Cxx/Utilities/2DArray

### Description

This example creates a 5x5 2D array and sets the (4,4) (zero based indexing, of course) entry to 5.0. Then it outputs this value to demonstrate accessing.

### Code

2DArray.cxx

    #include <vtkSmartPointer.h>
    #include <vtkDenseArray.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkDenseArray<double> > array =
        vtkSmartPointer<vtkDenseArray<double> >::New();

      array->Resize(5,5);

      array->SetValue(4,4, 5.0);

      std::cout << array->GetValue(4,4) << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(2DArray)

    find_package(VTK COMPONENTS
      vtkCommonCore QUIET)
    if (NOT VTK_FOUND)
      message("Skipping 2DArray: ${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(2DArray MACOSX_BUNDLE 2DArray.cxx )
      target_link_libraries(2DArray PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(2DArray MACOSX_BUNDLE 2DArray.cxx )
      target_link_libraries(2DArray PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS 2DArray
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build 2DArray

Click here to download 2DArray and its CMakeLists.txt file. Once the tarball 2DArray.tar has been downloaded and extracted,

    cd 2DArray/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:

    ./2DArray

WINDOWS USERS

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