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## CGAL::Qt_widget_get_polygon<Polygon>

### Definition

An object of type Qt_widget_get_polygon<Polygon> creates a CGAL polygon. A new vertex is inserted every time the left mouse button is pressed. The polygon is returned on a right click. You can use the Escape key if you want to remove your last entered point in the polygon. The use of Qt_widget_get_polygon<Polygon> requires that the mouse tracking is enabled for widgets attaching it.

#include <CGAL/IO/Qt_widget_get_polygon.h>

### Parameters

The full template declaration of Qt_widget_get_polygon states one parameter:

template < | class Polygon >
class Qt_widget_get_polygon;

Polygon should be a CGAL Polygon, or should provide the following types:

### Types

typedef Polygon::Point_2
| Point_2;
typedef Polygon::Segment_2
| Segment2;
typedef Polygon::Edge_const_iterator
| ECI;
typedef Polygon::Vertex_iterator
| VI;
typedef Polygon::FT
| FT;

### Inherits From

Qt_widget_tool

### Creation

Qt_widget_get_polygon<Polygon> getpoly ( | 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_simple_polygon<Polygon>

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The CGAL Project . Tue, December 21, 2004 .