Compute the boundary for a Geometry. More...

#include <BoundaryVisitor.h>

Inheritance diagram for SFCGAL::algorithm::BoundaryVisitor:

Public Member Functions
void	visit (const Point &g) override
	Visit a Point geometry to compute its boundary. More...

void	visit (const LineString &g) override
	Visit a LineString geometry to compute its boundary. More...

void	visit (const Polygon &g) override
	Visit a Polygon geometry to compute its boundary. More...

void	visit (const Triangle &g) override
	Visit a Triangle geometry to compute its boundary. More...

void	visit (const Solid &g) override
	Visit a Solid geometry to compute its boundary. More...

void	visit (const MultiPoint &g) override
	Visit a MultiPoint geometry to compute its boundary. More...

void	visit (const MultiLineString &g) override
	Visit a MultiLineString geometry to compute its boundary. More...

void	visit (const MultiPolygon &g) override
	Visit a MultiPolygon geometry to compute its boundary. More...

void	visit (const MultiSolid &g) override
	Visit a MultiSolid geometry to compute its boundary. More...

void	visit (const GeometryCollection &g) override
	Visit a GeometryCollection to compute its boundary. More...

void	visit (const PolyhedralSurface &g) override
	Visit a PolyhedralSurface geometry to compute its boundary. More...

void	visit (const TriangulatedSurface &g) override
	Visit a TriangulatedSurface geometry to compute its boundary. More...

void	visit (const NURBSCurve &g) override
	Process NURBSCurve for boundary calculation. More...

Geometry *	releaseBoundary ()
	get the boundary More...

Public Member Functions inherited from SFCGAL::ConstGeometryVisitor
virtual	~ConstGeometryVisitor ()
	Default destructor for ConstGeometryVisitor. More...

virtual void	visit (const Geometry &geometry)
	Apply this visitor to a generic const Geometry reference. More...

Protected Member Functions
void	getBoundaryFromLineStrings (const graph::GeometryGraph &g)
	get the boundary vertices for a set of LineString in a GeometryGraph More...

void	getBoundaryFromPolygons (const graph::GeometryGraph &g)
	get the boundary edges for a set of Polygons in a GeometryGraph More...

Detailed Description

Compute the boundary for a Geometry.

boundary( Point ) : GEOMETRYCOLLECTION EMPTY boundary( LineString ) : either GEOMETRYCOLLECTION EMPTY is the LineString is closed, or MULTIPOINT(2) boundary( Polygon ) : LINESTRING | MULTILINESTRING (polygon rings) boundary( Triangle ) : either GEOMETRYCOLLECTION EMPTY is the LineString is closed, or MULTIPOINT(2)

boundary( MultiPoint ) : GEOMETRYCOLLECTION EMPTY boundary( MultiLineString ) : either GEOMETRYCOLLECTION EMPTY or single occurance points

Warning: GeometryCollection are not supported in the general case

@ŧodo Solid

Todo:

MultiPolygon, PolyhedralSurface, TriangulatedSurface (same graph algorithm, edges without parallel or opposite)

MultiSolid : faced elimination

Todo:: GeometryCollection : complex for heterogeneous collection (not supported in GEOS)

Member Function Documentation

void SFCGAL::algorithm::BoundaryVisitor::getBoundaryFromLineStrings ( const graph::GeometryGraph & g )

protected

get the boundary vertices for a set of LineString in a GeometryGraph

Parameters

g	The GeometryGraph containing LineStrings

void SFCGAL::algorithm::BoundaryVisitor::getBoundaryFromPolygons ( const graph::GeometryGraph & g )

protected

get the boundary edges for a set of Polygons in a GeometryGraph

Parameters

g	The GeometryGraph containing Polygons

Warning: not optimal (edges could be counted using complex< vertex_descriptor >)

Todo:: merge resulting edges

auto SFCGAL::algorithm::BoundaryVisitor::releaseBoundary ( )

get the boundary

Releases and returns the visitor's current boundary geometry.

If the visitor holds an internal boundary, ownership of that Geometry is transferred to the caller and the visitor no longer retains it. If no internal boundary exists, a newly allocated empty GeometryCollection is returned.

Returns: Geometry* Pointer to a non-null Geometry instance owned by the caller. The caller is responsible for deleting the returned object.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const Point & g )

overridevirtual

Visit a Point geometry to compute its boundary.

Parameters

g	The Point geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const LineString & g )

overridevirtual

Visit a LineString geometry to compute its boundary.

Parameters

g	The LineString geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const Polygon & g )

overridevirtual

Visit a Polygon geometry to compute its boundary.

Parameters

g	The Polygon geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const Triangle & g )

overridevirtual

Visit a Triangle geometry to compute its boundary.

Parameters

g	The Triangle geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const Solid & g )

overridevirtual

Visit a Solid geometry to compute its boundary.

Parameters

g	The Solid geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const MultiPoint & g )

overridevirtual

Visit a MultiPoint geometry to compute its boundary.

Parameters

g	The MultiPoint geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const MultiLineString & g )

overridevirtual

Visit a MultiLineString geometry to compute its boundary.

Parameters

g	The MultiLineString geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const MultiPolygon & g )

overridevirtual

Visit a MultiPolygon geometry to compute its boundary.

Parameters

g	The MultiPolygon geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const MultiSolid & g )

overridevirtual

Visit a MultiSolid geometry to compute its boundary.

Parameters

g	The MultiSolid geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const GeometryCollection & g )

overridevirtual

Visit a GeometryCollection to compute its boundary.

Parameters

g	The GeometryCollection to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const PolyhedralSurface & g )

overridevirtual

Visit a PolyhedralSurface geometry to compute its boundary.

Parameters

g	The PolyhedralSurface geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const TriangulatedSurface & g )

overridevirtual

Visit a TriangulatedSurface geometry to compute its boundary.

Parameters

g	The TriangulatedSurface geometry to visit

Implements SFCGAL::ConstGeometryVisitor.

void SFCGAL::algorithm::BoundaryVisitor::visit ( const NURBSCurve & g )

overridevirtual

Process NURBSCurve for boundary calculation.

Compute and set the boundary for a NURBSCurve.

Parameters

g	The NURBSCurve geometry to process

If the curve is empty or its start and end coordinates are identical, the visitor clears the internal boundary. Otherwise the boundary is set to a MultiPoint containing copies of the curve's start and end points.

Reimplemented from SFCGAL::ConstGeometryVisitor.

Public Member Functions

Protected Member Functions

Detailed Description

Member Function Documentation