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
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.