frechet::poly::CgalPoint Class Reference

Detailed Description

a polygon vertex to be used with CGAL::Polygon_2. Derives from CGAL::Point_2 but is convertible to an from QPoint (which is used troughout the rest of the program). Also stores the index of the polygon vertex.

Please note that CGAL uses a coordinate system different from Qt.

• Qt assumes (0,0) on the TOP left of the drawing plane
• CGAL assumes (0,0) on the BOTTOM left of the plane

In most cases this doesn't matter much, but sometimes you have to know this (e.g. when deciding if a polygon is oriented clock-wise or not).

Author

Peter Schäfer

Definition at line 43 of file poly_utils.h.

#include <poly_utils.h>

Inherits Point_2< Kernel >.

Public Types
typedef CGAL::Point_2< Kernel >	super

Public Member Functions
	CgalPoint ()
	empty constructor More...
	CgalPoint (const QPointF &p, int i=-1)
	default constructor from point More...
	CgalPoint (double x, double y, int i=-1)
	default constructor from coordinates. assumes CGAL coordinate plane (0,0 on BOTTOM left). More...
CgalPoint &	operator= (const QPointF &p)
	assignment operator from QPointF More...
	operator QPointF () const
	conversion operator to QPointF More...

Public Attributes
int	i
	index of polygon vertex (-1 if not available) More...
bool	erase
	used by PolgonUtilities::simplify to mark vertexes for deletion More...

Member Typedef Documentation

super

typedef CGAL::Point_2<Kernel> frechet::poly::CgalPoint::super

Definition at line 46 of file poly_utils.h.

Constructor & Destructor Documentation

CgalPoint() [1/3]

CgalPoint::CgalPoint

(

)

empty constructor

Definition at line 313 of file poly_utils.cpp.

CgalPoint() [2/3]

CgalPoint::CgalPoint	(	const QPointF &	p,
		int	i = -1
	)

default constructor from point

Parameters

p	point in the plane. assumes Qt coordinate plane (0,0 on TOP left)
i	index of polygon vertex (optional)

Definition at line 317 of file poly_utils.cpp.

CgalPoint() [3/3]

CgalPoint::CgalPoint	(	double	x,
		double	y,
		int	i = -1
	)

default constructor from coordinates. assumes CGAL coordinate plane (0,0 on BOTTOM left).

Parameters

x	x-coordinate of point
y	y-coordinate of point
i	index of polygon vertex (optional)

Definition at line 321 of file poly_utils.cpp.

Member Function Documentation

operator QPointF()

CgalPoint::operator QPointF

(

)

const

conversion operator to QPointF

Definition at line 332 of file poly_utils.cpp.

operator=()

CgalPoint & CgalPoint::operator=

(

const QPointF &

p

)

assignment operator from QPointF

Parameters

p

a point

Returns

reference to this object, after assignment

Definition at line 325 of file poly_utils.cpp.

Member Data Documentation

erase

bool frechet::poly::CgalPoint::erase

mutable

used by PolgonUtilities::simplify to mark vertexes for deletion

Definition at line 50 of file poly_utils.h.

i

int frechet::poly::CgalPoint::i

index of polygon vertex (-1 if not available)

Definition at line 48 of file poly_utils.h.

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The documentation for this class was generated from the following files:

• include/frechet/poly/poly_utils.h
• src/frechet/poly/poly_utils.cpp