# DataBounds

VTKExamples/Cxx/PolyData/DataBounds

### Description

This examples gets the bounds of a dataset. Note that Update() must be applied to create the output of the filter.

### Code

DataBounds.cxx

    #include <vtkSphereSource.h>
    #include <vtkSmartPointer.h>
    #include <vtkPolyData.h>
    #include <vtkXMLPolyDataReader.h>

    int main(int argc, char *argv[])
    {
      vtkSmartPointer<vtkPolyData> polyData =
        vtkSmartPointer<vtkPolyData>::New();

      if (argc > 1)
      {
        vtkSmartPointer<vtkXMLPolyDataReader> reader =
          vtkSmartPointer<vtkXMLPolyDataReader>::New();
        reader->SetFileName ( argv[1] );
        reader->Update();
        polyData = reader->GetOutput();
      }
      else
      {
        vtkSmartPointer<vtkSphereSource> modelSource =
          vtkSmartPointer<vtkSphereSource>::New();
        modelSource->Update();
        polyData = modelSource->GetOutput();
      }

      double bounds[6];
      polyData->GetBounds(bounds);

      std::cout  << "xmin: " << bounds[0] << " "
                 << "xmax: " << bounds[1] << std::endl
                 << "ymin: " << bounds[2] << " "
                 << "ymax: " << bounds[3] << std::endl
                 << "zmin: " << bounds[4] << " "
                 << "zmax: " << bounds[5] << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(DataBounds)

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

### Download and Build DataBounds

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

    cd DataBounds/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:

    ./DataBounds

WINDOWS USERS

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