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## CGAL::Qt_widget_get_circle<T>

### Definition

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>

### Parameters

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:

### 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_layer

### Creation

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.

Next: Qt_widget_get_iso_rectangle<T>

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The CGAL Project . Tue, December 21, 2004 .