GEOS 3.13.1
geos::operation::buffer::MaximalEdgeRing Class Reference

A ring of DirectedEdges which may contain nodes of degree > 2. More...

#include <MaximalEdgeRing.h>

Inheritance diagram for geos::operation::buffer::MaximalEdgeRing:
geos::geomgraph::EdgeRing

Public Member Functions

 MaximalEdgeRing (geomgraph::DirectedEdge *start, const geom::GeometryFactory *geometryFactory)
geomgraph::DirectedEdgegetNext (geomgraph::DirectedEdge *de) override
void setEdgeRing (geomgraph::DirectedEdge *de, geomgraph::EdgeRing *er) override
std::vector< MinimalEdgeRing * > * buildMinimalRings ()
 This function returns a newly allocated vector of pointers to newly allocated MinimalEdgeRing objects.
void buildMinimalRings (std::vector< MinimalEdgeRing * > &minEdgeRings)
 This function pushes pointers to newly allocated MinimalEdgeRing objects to the provided vector.
void buildMinimalRings (std::vector< EdgeRing * > &minEdgeRings)
void linkDirectedEdgesForMinimalEdgeRings ()
 For all nodes in this EdgeRing, link the DirectedEdges at the node to form minimalEdgeRings.
Public Member Functions inherited from geos::geomgraph::EdgeRing
 EdgeRing (DirectedEdge *newStart, const geom::GeometryFactory *newGeometryFactory)
bool isIsolated ()
bool isHole ()
geom::LinearRinggetLinearRing ()
LabelgetLabel ()
bool isShell ()
EdgeRinggetShell ()
void setShell (EdgeRing *newShell)
void addHole (EdgeRing *edgeRing)
std::unique_ptr< geom::PolygontoPolygon (const geom::GeometryFactory *geometryFactory)
void computeRing ()
std::vector< DirectedEdge * > & getEdges ()
int getMaxNodeDegree ()
void setInResult ()
bool containsPoint (const geom::Coordinate &p)
void testInvariant () const

Additional Inherited Members

Protected Member Functions inherited from geos::geomgraph::EdgeRing
void computePoints (DirectedEdge *newStart)
void mergeLabel (const Label &deLabel)
void mergeLabel (const Label &deLabel, uint8_t geomIndex)
 Merge the RHS label from a DirectedEdge into the label for this EdgeRing.
void addPoints (Edge *edge, bool isForward, bool isFirstEdge)
Protected Attributes inherited from geos::geomgraph::EdgeRing
DirectedEdgestartDe
const geom::GeometryFactorygeometryFactory
std::vector< std::unique_ptr< EdgeRing > > holes
 a list of EdgeRings which are holes in this EdgeRing

Detailed Description

A ring of DirectedEdges which may contain nodes of degree > 2.

A MaximalEdgeRing may represent two different spatial entities:

  • a single polygon possibly containing inversions (if the ring is oriented CW)
  • a single hole possibly containing exversions (if the ring is oriented CCW)

If the MaximalEdgeRing represents a polygon, the interior of the polygon is strongly connected.

These are the form of rings used to define polygons under some spatial data models. However, under the OGC SFS model, MinimalEdgeRings are required. A MaximalEdgeRing can be converted to a list of MinimalEdgeRings using the buildMinimalRings() method.

See also
com.vividsolutions.jts.operation.overlay.MinimalEdgeRing

Member Function Documentation

◆ buildMinimalRings()

std::vector< MinimalEdgeRing * > * geos::operation::buffer::MaximalEdgeRing::buildMinimalRings ( )

This function returns a newly allocated vector of pointers to newly allocated MinimalEdgeRing objects.

Deprecated
pass the vector yourself instead

Referenced by buildMinimalRings().

◆ getNext()

geomgraph::DirectedEdge * geos::operation::buffer::MaximalEdgeRing::getNext ( geomgraph::DirectedEdge * de)
overridevirtual

◆ setEdgeRing()

void geos::operation::buffer::MaximalEdgeRing::setEdgeRing ( geomgraph::DirectedEdge * de,
geomgraph::EdgeRing * er )
overridevirtual

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