PNGReader

VTKExamples/Cxx/IO/PNGReader


Description

This example demonstrates how to read a PNG image file.

Code

PNGReader.cxx

#include <vtkSmartPointer.h>
#include <vtkImageViewer2.h>
#include <vtkPNGReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int argc, char* argv[])
{
  // Verify input arguments
  if ( argc < 2 )
  {
    std::cout << "Usage: " << argv[0]
              << " Filename(.png)" << std::endl;
    return EXIT_FAILURE;
  }

  // Read the image
  vtkSmartPointer<vtkPNGReader> reader =
    vtkSmartPointer<vtkPNGReader>::New();
  reader->SetFileName(argv[1]);

  // Visualize
  vtkSmartPointer<vtkImageViewer2> imageViewer =
    vtkSmartPointer<vtkImageViewer2>::New();
  imageViewer->SetInputConnection(reader->GetOutputPort());
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  imageViewer->SetupInteractor(renderWindowInteractor);
  imageViewer->Render();
  imageViewer->GetRenderer()->ResetCamera();
  imageViewer->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(PNGReader)

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

add_executable(PNGReader MACOSX_BUNDLE PNGReader.cxx )

target_link_libraries(PNGReader ${VTK_LIBRARIES})

Download and Build PNGReader

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

cd PNGReader/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:

./PNGReader

WINDOWS USERS

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