ITK/Examples/SimpleOperations/SetPixels: Difference between revisions

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<div class="floatcenter">[[File:ITK_Examples_Baseline_SimpleOperations_TestSetPixels.png]]</div>
{{warning|1=The media wiki content on this page is no longer maintained.  The examples presented on the https://itk.org/Wiki/*  pages likely require ITK version 4.13 or earlier releases.  In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.
This example demonstrates how to set the value of individual pixels in an image.
}}


==SetPixels.cxx==
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
<source lang="cpp">
#include "itkImage.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkVersion.h"
#include "vtkImageViewer.h"
#include "vtkImageMapper3D.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
 
int main(int, char *[])
{
  typedef itk::Image< unsigned char, 2 >  ImageType;
 
  ImageType::RegionType region;
  ImageType::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  ImageType::SizeType size;
  size[0] = 200;
  size[1] = 300;
 
  region.SetSize(size);
  region.SetIndex(start);
 
  ImageType::Pointer image = ImageType::New();
  image->SetRegions(region);
  image->Allocate();
 
  // Set pixels in a square to one value
  for(unsigned int r = 20; r < 80; r++)
  {
      for(unsigned int c = 30; c < 100; c++)
      {
          ImageType::IndexType pixelIndex;
          pixelIndex[0] = r;
          pixelIndex[1] = c;
 
          image->SetPixel(pixelIndex, 255);
      }
  }
 
  // Set pixels in a different square to a different value
  for(unsigned int r = 100; r < 130; r++)
  {
      for(unsigned int c = 115; c < 160; c++)
      {
          ImageType::IndexType pixelIndex;
          pixelIndex[0] = r;
          pixelIndex[1] = c;
 
          image->SetPixel(pixelIndex, 125);
      }
  }
 
  typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
  ConnectorType::Pointer connector = ConnectorType::New();
  connector->SetInput(image);
 
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
  actor->SetInput(connector->GetOutput());
#else
  connector->Update(); 
  actor->GetMapper()->SetInputData(connector->GetOutput());
#endif
 
  // Visualize
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);
 
  renderer->AddActor(actor);
 
  renderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}
</source>
 
{{ITKVTKCMakeLists|{{SUBPAGENAME}}}}

Latest revision as of 20:30, 30 May 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.

[ITK Sphinx Examples]