An object of type Qt_widget_get_circle<T> creates a CGAL circle in this way: one left click on the mouse will be the center of the circle and the second point will be considered at the coordinates where the left mouse button is pressed for the second time, the distance between those 2 representing the radius of the new circle. You can always cancel the creation process by pressing the ESC key. The use of Qt_widget_get_circle<T> requires that the mouse tracking is enabled for widgets attaching it.

#include <CGAL/IO/Qt_widget_get_circle.h>


The full template declaration of Qt_widget_get_circle states one parameter:

template < class T >
class Qt_widget_get_circle;

If T is one of the CGAL kernels you don't need additional types. If not, the parameter T has to provide this types:


typedef T::Point_2 Point_2; This should be a Point type

typedef T::Circle_2 Circle_2; This should be a Circle type

typedef T::FT FT; This should be a Field type

Inherits From



Qt_widget_get_circle<T> getcircle ( const QCursor c=QCursor(Qt::crossCursor), QObject* parent = 0, const char* name = 0);
c is the cursor that this layer will use when is active. parent is the parent widget and name is the name you give to this layer.