ImageNoiseSource

VTKExamples/Cxx/Images/ImageNoiseSource


Question

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Code

ImageNoiseSource.cxx

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageNoiseSource.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkNamedColors.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  // Create an image of noise
  vtkSmartPointer<vtkImageNoiseSource> noiseSource = 
    vtkSmartPointer<vtkImageNoiseSource>::New();
  noiseSource->SetWholeExtent(0, 200, 0, 200, 0, 0);
  noiseSource->SetMinimum(0.0);
  noiseSource->SetMaximum(255.0);

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

  // Create an actor
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
  actor->GetMapper()->SetInputConnection(castFilter->GetOutputPort());

  // Setup renderer
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderer->AddActor(actor);
  renderer->ResetCamera();
  renderer->SetBackground(colors->GetColor3d("Wheat").GetData());

  // Setup render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  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);

  renderWindow->Render();
  renderWindowInteractor->Start();
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ImageNoiseSource)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkImagingCore
  vtkImagingSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping ImageNoiseSource: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(ImageNoiseSource MACOSX_BUNDLE ImageNoiseSource.cxx )
  target_link_libraries(ImageNoiseSource PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ImageNoiseSource MACOSX_BUNDLE ImageNoiseSource.cxx )
  target_link_libraries(ImageNoiseSource PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ImageNoiseSource
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build ImageNoiseSource

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

cd ImageNoiseSource/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:

./ImageNoiseSource

WINDOWS USERS

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