VTK/Examples/Cxx/IO/PNGWriter

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PNGWriter.cxx

#include <vtkImageData.h>
#include <vtkPNGWriter.h>
#include <vtkSmartPointer.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageCast.h>

int main(int argc, char *argv[])
{
  std::string outputFilename;
  if( argc > 1)
    {
    outputFilename = argv[1];
    }
  else
    {
    outputFilename = "output.png";
    }

  int extent[6] = {0, 99, 0, 99, 0, 0};
  vtkSmartPointer<vtkImageCanvasSource2D> imageSource =
    vtkSmartPointer<vtkImageCanvasSource2D>::New();
  imageSource->SetExtent(extent);
  imageSource->SetScalarTypeToUnsignedChar();
  imageSource->SetNumberOfScalarComponents(3);
  imageSource->SetDrawColor(127, 45, 255);
  imageSource->FillBox(0, 99, 0, 99);
  imageSource->SetDrawColor(255,255,255);
  imageSource->FillBox(40, 70, 20, 50);
  imageSource->Update();

  vtkSmartPointer<vtkImageCast> castFilter =
    vtkSmartPointer<vtkImageCast>::New();
  castFilter->SetOutputScalarTypeToUnsignedChar ();
  castFilter->SetInputConnection(imageSource->GetOutputPort());
  castFilter->Update();

  vtkSmartPointer<vtkPNGWriter> writer =
    vtkSmartPointer<vtkPNGWriter>::New();
  writer->SetFileName(outputFilename.c_str());
  writer->SetInputConnection(castFilter->GetOutputPort());
  writer->Write();

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(PNGWriter)

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

add_executable(PNGWriter MACOSX_BUNDLE PNGWriter.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(PNGWriter ${VTK_LIBRARIES})
else()
  target_link_libraries(PNGWriter vtkHybrid vtkWidgets)
endif()

Download and Build PNGWriter

Click here to download PNGWriter. and its CMakeLists.txt file.

Once the tarball PNGWriter.tar has been downloaded and extracted,

cd PNGWriter/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:

./PNGWriter

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