General_polygon_2<ArrTraits>

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CGAL::General_polygon_2<ArrTraits>

Definition

The class General_polygon_2<ArrTraits> models the concept GeneralPolygon_2. It represents a simple general-polygon. It is parameterized with the type ArrTraits that models the concept ArrangementDirectionalXMonotoneTraits. The latter is a refinement of the concept ArrangementXMonotoneTraits_2. In addition to the requirements of the concept ArrangementXMonotoneTraits_2, a model of the concept ArrangementDirectionalXMonotoneTraits must support the following functions:

Given an x-monotone curve, construct its opposite curve.
Given an x-monotone curve, compare its two endpoints lexicographically.

This class supports a few convenient operations in addition to the requirements that the concept GeneralPolygon_2 lists.

#include <CGAL/General_polygon_2.h>

Types

General_polygon_2<ArrTraits>::Size
	number of edges size type.

Creation

Operations

Size

polygon.size ()

returns the number of edges of polygon.

Modifiers

void

polygon.clear ()

clears polygon.

void

polygon.reverse_orientation ()

reverses the orientation of the polygon.

Precondition:

is_simple().

Predicates

bool

polygon.is_empty ()

returns true if polygon is empty, and false otherwise.

Orientation

polygon.orientation ()

returns the orientation of polygon.

Precondition:

is_simple().

Is Model for the Concepts

GeneralPolygon_2

Next: Polygon_with_holes_2<Kernel,Container>

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CGAL Open Source Project. Release 4.1. 23 October 2012.