ImageSlice

VTKExamples/Cxx/Images/ImageSlice


Code

ImageSlice.cxx

#include <vtkVersion.h>
#include <vtkImageData.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageMapper.h>
#include <vtkImageResliceMapper.h>
#include <vtkImageSlice.h>

static void CreateColorImage(vtkImageData*);

int main(int, char *[])
{
  vtkSmartPointer<vtkImageData> colorImage = vtkSmartPointer<vtkImageData>::New();
  CreateColorImage(colorImage);

  vtkSmartPointer<vtkImageResliceMapper> imageResliceMapper = vtkSmartPointer<vtkImageResliceMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  imageResliceMapper->SetInputConnection(colorImage->GetProducerPort());
#else
  imageResliceMapper->SetInputData(colorImage);
#endif

  vtkSmartPointer<vtkImageSlice> imageSlice = vtkSmartPointer<vtkImageSlice>::New();
  imageSlice->SetMapper(imageResliceMapper);

  // Setup renderers
  vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
  renderer->AddViewProp(imageSlice);
  renderer->ResetCamera();

  // Setup render window
  vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(300, 300);
  renderWindow->AddRenderer(renderer);

  // Setup render window interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();

  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();

  renderWindowInteractor->SetInteractorStyle(style);

  // Render and start interaction
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindowInteractor->Initialize();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

void CreateColorImage(vtkImageData* image)
{
  image->SetDimensions(10, 10, 1);
#if VTK_MAJOR_VERSION <= 5
  image->SetScalarTypeToUnsignedChar();
  image->SetNumberOfScalarComponents(3);
  image->AllocateScalars();
#else
  image->AllocateScalars(VTK_UNSIGNED_CHAR,3);
#endif
  for(unsigned int x = 0; x < 10; x++)
  {
    for(unsigned int y = 0; y < 10; y++)
    {
      unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
      pixel[0] = 255;
      pixel[1] = 0;
      pixel[2] = 255;
    }
  }
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ImageSlice)

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

add_executable(ImageSlice MACOSX_BUNDLE ImageSlice.cxx )

target_link_libraries(ImageSlice ${VTK_LIBRARIES})

Download and Build ImageSlice

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

cd ImageSlice/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:

./ImageSlice

WINDOWS USERS

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