VTK/Examples/Cxx/GeometricObjects/Circle

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VTK Examples Baseline Filters TestCircle.png

A circle is simply the limiting case of a regular polygon. We use vtkRegularPolygonSource with a large number of Sides to approximate a circle.

Circle.cxx

#include <vtkRegularPolygonSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
 
int main(int , char *[])
{
  // Create a circle
  vtkSmartPointer<vtkRegularPolygonSource> polygonSource =
    vtkSmartPointer<vtkRegularPolygonSource>::New();
 
  //polygonSource->GeneratePolygonOff();
  polygonSource->SetNumberOfSides(50);
  polygonSource->SetRadius(5);
  polygonSource->SetCenter(0,0,0);
  polygonSource->Update();
 
  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(polygonSource->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
 
  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);
  renderer->SetBackground(.3,.3,.5); // Background color purple
 
  renderWindow->Render();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(Circle)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
if (APPLE)
  add_executable(Circle MACOSX_BUNDLE Circle.cxx)
else()
  add_executable(Circle Circle.cxx)
endif()
 
if(VTK_LIBRARIES)
  target_link_libraries(Circle ${VTK_LIBRARIES})
else()
  target_link_libraries(Circle vtkHybrid )
endif()
Retrieved from "http://www.vtk.org/Wiki/VTK/Examples/Cxx/GeometricObjects/Circle"
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