VTK/Examples/Cxx/Images/Interpolation

#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>
#include <vtkImageProperty.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);
  imageSlice->GetProperty()->SetInterpolationTypeToNearest();
 
  // 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->SetNumberOfScalarComponents(3);
  image->SetScalarTypeToUnsignedChar();
  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;
      }
    }
}