# GetLinearPointId

VTKExamples/Cxx/StructuredData/GetLinearPointId

### Code

GetLinearPointId.cxx

    #include <vtkSmartPointer.h>
    #include <vtkStructuredData.h>
    #include <vtkStructuredGrid.h>

    int main(int, char *[])
    {
      // Create a grid
      vtkSmartPointer<vtkStructuredGrid> structuredGrid =
        vtkSmartPointer<vtkStructuredGrid>::New();

      // Set the dimensions of the grid
      {
        int dims[3] = {5,10,1};
        structuredGrid->SetDimensions(dims);
      }

      // Retrieve the dimensions of the grid
      int dimensions[3];
      structuredGrid->GetDimensions(dimensions);

      {
      int queryPoint[3] = {4, 0, 0};
      vtkIdType pointId = vtkStructuredData::ComputePointId(dimensions, queryPoint);

      std::cout << "PointId: " << pointId << std::endl; // Outputs '4'
      }

      {
      int queryPoint[3] = {0, 1, 0};
      vtkIdType pointId = vtkStructuredData::ComputePointId(dimensions, queryPoint);

      std::cout << "PointId: " << pointId << std::endl; // Outputs '5'
      }
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(GetLinearPointId)

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

    add_executable(GetLinearPointId MACOSX_BUNDLE GetLinearPointId.cxx )

    target_link_libraries(GetLinearPointId ${VTK_LIBRARIES})

### Download and Build GetLinearPointId

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

    cd GetLinearPointId/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:

    ./GetLinearPointId

WINDOWS USERS

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