A visitor that flips polygon rings so that exterior rings are in a counter-clockwise direction and interior rings in a clockwise direction. More...

#include <ring_flip_visitor.h>

Inheritance diagram for gis::Ring_flip_visitor:

[legend]

Public Member Functions
	Ring_flip_visitor (double semi_major, double semi_minor)
	Construct a new ring flip visitor. More...

bool	invalid () const
	Check if anything wrong has been detected, either an invalid ellipsoid or a ring with an unknown direction. More...

bool	visit_enter (Polygon *py) override

bool	visit_enter (Multipolygon *py) override

bool	visit_enter (Multipoint *) override

bool	visit_enter (Multilinestring *) override

bool	visit_enter (Geometry *) override
	Enters a compound geometry. More...

bool	visit_enter (Curve *c) override

bool	visit_enter (Linestring *ls) override

bool	visit_enter (Linearring *lr) override

bool	visit_enter (Surface *s) override

bool	visit_enter (Polygon *py) override

bool	visit_enter (Geometrycollection *gc) override

bool	visit_enter (Multipoint *mpt) override

bool	visit_enter (Multicurve *mc) override

bool	visit_enter (Multilinestring *mls) override

bool	visit_enter (Multisurface *ms) override

bool	visit_enter (Multipolygon *mpy) override

Public Member Functions inherited from gis::Nop_visitor
bool	visit (Geometry *) override
	Visits a geometry. More...

bool	visit (Point *pt) override

bool	visit (Curve *c) override

bool	visit (Linestring *ls) override

bool	visit (Linearring *lr) override

bool	visit (Surface *s) override

bool	visit (Polygon *py) override

bool	visit (Geometrycollection *gc) override

bool	visit (Multipoint *mpt) override

bool	visit (Multicurve *mc) override

bool	visit (Multilinestring *mls) override

bool	visit (Multisurface *ms) override

bool	visit (Multipolygon *mpy) override

bool	visit_leave (Geometry *) override
	Leaves a compound geometry. More...

bool	visit_leave (Curve *c) override

bool	visit_leave (Linestring *ls) override

bool	visit_leave (Linearring *lr) override

bool	visit_leave (Surface *s) override

bool	visit_leave (Polygon *py) override

bool	visit_leave (Geometrycollection *gc) override

bool	visit_leave (Multipoint *mpt) override

bool	visit_leave (Multicurve *mc) override

bool	visit_leave (Multilinestring *mls) override

bool	visit_leave (Multisurface *ms) override

bool	visit_leave (Multipolygon *mpy) override

Public Member Functions inherited from gis::Geometry_visitor
	Geometry_visitor ()=default

virtual	~Geometry_visitor ()=default

Private Attributes
std::unique_ptr< boost::geometry::strategy::area::geographic<> >	m_geographic_strategy
	Strategy used for geographic SRSs. More...

bool	m_invalid
	Whether the geometry is invalid. More...

Detailed Description

A visitor that flips polygon rings so that exterior rings are in a counter-clockwise direction and interior rings in a clockwise direction.

Invalid polygon rings are not guaranteed to be flipped to the correct direction.

Constructor & Destructor Documentation

◆ Ring_flip_visitor()

gis::Ring_flip_visitor::Ring_flip_visitor	(	double	semi_major,
		double	semi_minor
	)

inline

Construct a new ring flip visitor.

Parameters

[in]	semi_major	The semi-major axis of the ellipsoid.
[in]	semi_minor	The semi-minor axis of the ellipsoid.

Member Function Documentation

◆ invalid()

bool gis::Ring_flip_visitor::invalid ( ) const

inline

Check if anything wrong has been detected, either an invalid ellipsoid or a ring with an unknown direction.

Polygon rings which direction can't be determined are invalid. This is the only way this visitor detects invalid rings. Other invalid rings, e.g., rings crossing themselves, are not necessarily detected.

Return values

true	Invalid SRS ellipsoid or invalid polygon ring.
false	No invalid rings detected, but the geometry may still be invalid.

◆ visit_enter() [1/16]

bool gis::Nop_visitor::visit_enter ( Curve * c )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [2/16]

bool gis::Nop_visitor::visit_enter ( Geometry * g )

inlineoverridevirtual

Enters a compound geometry.

This is called on entry to a compound geometry, i.e., all geometries except points.

Parameters

g	The geometry to visit.

Return values

true	Don't descend into children.
false	Descend into children.

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [3/16]

bool gis::Nop_visitor::visit_enter ( Geometrycollection * gc )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [4/16]

bool gis::Nop_visitor::visit_enter ( Linearring * lr )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [5/16]

bool gis::Nop_visitor::visit_enter ( Linestring * ls )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [6/16]

bool gis::Nop_visitor::visit_enter ( Multicurve * mc )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [7/16]

bool gis::Ring_flip_visitor::visit_enter ( Multilinestring * )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [8/16]

bool gis::Nop_visitor::visit_enter ( Multilinestring * mls )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [9/16]

bool gis::Ring_flip_visitor::visit_enter ( Multipoint * )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [10/16]

bool gis::Nop_visitor::visit_enter ( Multipoint * mpt )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [11/16]

bool gis::Nop_visitor::visit_enter ( Multipolygon * mpy )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [12/16]

bool gis::Ring_flip_visitor::visit_enter ( Multipolygon * py )

overridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [13/16]

bool gis::Nop_visitor::visit_enter ( Multisurface * ms )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [14/16]

bool gis::Nop_visitor::visit_enter ( Polygon * py )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [15/16]

bool gis::Ring_flip_visitor::visit_enter ( Polygon * py )

overridevirtual

Reimplemented from gis::Nop_visitor.

◆ visit_enter() [16/16]

bool gis::Nop_visitor::visit_enter ( Surface * s )

inlineoverridevirtual

Reimplemented from gis::Nop_visitor.

Member Data Documentation

◆ m_geographic_strategy

std::unique_ptr<boost::geometry::strategy::area::geographic<> > gis::Ring_flip_visitor::m_geographic_strategy

private

Strategy used for geographic SRSs.

◆ m_invalid

bool gis::Ring_flip_visitor::m_invalid

private

Whether the geometry is invalid.

That happens either if the ellipsoid of a geographic SRS is invalid or if we encounter a ring with unknown direction.

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

sql/gis/ring_flip_visitor.h
sql/gis/ring_flip_visitor.cc

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Ring_flip_visitor()

Member Function Documentation

◆ invalid()

◆ visit_enter() [1/16]

◆ visit_enter() [2/16]

◆ visit_enter() [3/16]

◆ visit_enter() [4/16]

◆ visit_enter() [5/16]

◆ visit_enter() [6/16]

◆ visit_enter() [7/16]

◆ visit_enter() [8/16]

◆ visit_enter() [9/16]

◆ visit_enter() [10/16]

◆ visit_enter() [11/16]

◆ visit_enter() [12/16]

◆ visit_enter() [13/16]

◆ visit_enter() [14/16]

◆ visit_enter() [15/16]

◆ visit_enter() [16/16]

Member Data Documentation

◆ m_geographic_strategy

◆ m_invalid