VTK/Examples/Cxx/Visualization/ImageOrder

#include <vtkVersion.h>
#include <vtkImageActor.h>
#include <vtkImageData.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkTransform.h>
 
static void CreateWhiteImage(vtkSmartPointer<vtkImageData> image);
static void CreateRedImage(vtkSmartPointer<vtkImageData> image);
 
int main(int, char* [])
{
  // Image 1
  vtkSmartPointer<vtkImageData> whiteImage =
    vtkSmartPointer<vtkImageData>::New();
  CreateWhiteImage(whiteImage);
 
  vtkSmartPointer<vtkImageActor> whiteImageActor =
    vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
  whiteImageActor->SetInput(whiteImage);
#else
  whiteImageActor->SetInputData(whiteImage);
#endif
 
  // Image 2
  vtkSmartPointer<vtkImageData> redImage =
    vtkSmartPointer<vtkImageData>::New();
  CreateRedImage(redImage);
 
  vtkSmartPointer<vtkImageActor> redImageActor =
    vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
  redImageActor->SetInput(redImage);
#else
  redImageActor->SetInputData(redImage);
#endif
 
  // Visualize
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
 
  // Red image is displayed
  renderer->AddActor(whiteImageActor);
  renderer->AddActor(redImageActor);
 
  // White image is displayed
  //renderer->AddActor(redImageActor);
  //renderer->AddActor(whiteImageActor);
  renderer->ResetCamera();
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  renderWindowInteractor->SetInteractorStyle(style);
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindowInteractor->Initialize();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}
 
void CreateWhiteImage(vtkSmartPointer<vtkImageData> image)
{
  // Create a white 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
 
  int* dims = image->GetDimensions();
 
  for (int y = 0; y < dims[1]; y++)
    {
    for (int x = 0; x < dims[0]; x++)
      {
      unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
      pixel[0] = 255;
      pixel[1] = 255;
      pixel[2] = 255;
      }
    }
}
 
void CreateRedImage(vtkSmartPointer<vtkImageData> image)
{
  // Create a red 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
  int* dims = image->GetDimensions();
 
  for (int y = 0; y < dims[1]; y++)
    {
    for (int x = 0; x < dims[0]; x++)
      {
      unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
      pixel[0] = 255;
      pixel[1] = 0;
      pixel[2] = 0;
      }
    }
}