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ReadPNM

vtk-examples/Cxx/IO/ReadPNM


Other languages

See (Java), (CSharp)

Question

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Code

ReadPNM.cxx

#include <vtkNew.h>
#include <vtkImageViewer2.h>
#include <vtkPNMReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>


int main(int argc, char* argv[])
{
  vtkNew<vtkNamedColors> colors;

  // Verify input arguments
  if (argc != 2)
  {
    std::cout << "Usage: " << argv[0] << " Filename(.pnm) e.g Gourds.pnm"
              << std::endl;
    return EXIT_FAILURE;
  }

  // Read the image
  vtkNew<vtkPNMReader> reader;
  reader->SetFileName(argv[1]);

  // Visualize
  vtkNew<vtkImageViewer2> imageViewer;
  imageViewer->SetInputConnection(reader->GetOutputPort());
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  imageViewer->SetupInteractor(renderWindowInteractor);
  imageViewer->Render();
  imageViewer->GetRenderer()->ResetCamera();
  imageViewer->GetRenderer()->SetBackground(
      colors->GetColor3d("SlateGray").GetData());
  imageViewer->GetRenderWindow()->SetWindowName("ReadPNM");
  imageViewer->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ReadPNM)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkIOImage
  vtkInteractionImage
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping ReadPNM: ${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(ReadPNM MACOSX_BUNDLE ReadPNM.cxx )
  target_link_libraries(ReadPNM PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ReadPNM MACOSX_BUNDLE ReadPNM.cxx )
  target_link_libraries(ReadPNM PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ReadPNM
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ReadPNM

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

cd ReadPNM/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:

./ReadPNM

WINDOWS USERS

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