Circle
VTKExamples/Cxx/GeometricObjects/Circle
Description¶
A circle is simply the limiting case of a regular polygon. We use vtkRegularPolygonSource with a large number of Sides to approximate a circle.
Code¶
Circle.cxx
// Classes specific to this example #include <vtkRegularPolygonSource.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> // Generic VTK pipeline elements #include <vtkActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> // Auxiliary class #include <vtkSmartPointer.h> int main(int, char *[]) { // Create a circle vtkSmartPointer<vtkRegularPolygonSource> polygonSource = vtkSmartPointer<vtkRegularPolygonSource>::New(); //polygonSource->GeneratePolygonOff(); // Uncomment this line to generate only the outline of the circle polygonSource->SetNumberOfSides(50); polygonSource->SetRadius(5); polygonSource->SetCenter(0, 0, 0); // 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(); renderer->AddActor(actor); renderer->SetBackground(.3,.3,.5); // Background color purple vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Circle) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Circle MACOSX_BUNDLE Circle.cxx) target_link_libraries(Circle ${VTK_LIBRARIES})
Download and Build Circle¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download Circle and its CMakeLists.txt file. Once the tarball Circle.tar has been downloaded and extracted,
cd Circle/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:
./Circle
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.