CornerAnnotation

VTKExamples/Cxx/Visualization/CornerAnnotation

Other Languages

See (Java)

Question

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Code

CornerAnnotation.cxx

#include <vtkSmartPointer.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkTextProperty.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkCornerAnnotation.h>

int main( int, char *[] )
{
  vtkSmartPointer<vtkSphereSource> sphereSource = 
      vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  vtkSmartPointer<vtkPolyDataMapper> mapper = 
      vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection( sphereSource->GetOutputPort() );

  vtkSmartPointer<vtkActor> actor = 
      vtkSmartPointer<vtkActor>::New();
  actor->SetMapper( mapper );

  // Visualize
  vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer( renderer );

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow( renderWindow );
  renderer->AddActor( actor );

   // Annotate the image with window/level and mouse over pixel information
  vtkSmartPointer<vtkCornerAnnotation> cornerAnnotation = 
      vtkSmartPointer<vtkCornerAnnotation>::New();
  cornerAnnotation->SetLinearFontScaleFactor( 2 );
  cornerAnnotation->SetNonlinearFontScaleFactor( 1 );
  cornerAnnotation->SetMaximumFontSize( 20 );
  cornerAnnotation->SetText( 0, "lower left" );
  cornerAnnotation->SetText( 1, "lower right" );
  cornerAnnotation->SetText( 2, "upper left" );
  cornerAnnotation->SetText( 3, "upper right" );
  cornerAnnotation->GetTextProperty()->SetColor( 1, 0, 0 );

  renderer->AddViewProp( cornerAnnotation );

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(CornerAnnotation)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingAnnotation
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping CornerAnnotation: ${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(CornerAnnotation MACOSX_BUNDLE CornerAnnotation.cxx )
  target_link_libraries(CornerAnnotation PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(CornerAnnotation MACOSX_BUNDLE CornerAnnotation.cxx )
  target_link_libraries(CornerAnnotation PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS CornerAnnotation
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build CornerAnnotation

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

cd CornerAnnotation/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:

./CornerAnnotation

WINDOWS USERS

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