GEOS
3.8.0dev

Checks that a geomgraph::GeometryGraph representing an area (a Polygon or MultiPolygon ) is consistent with the OGCSFS semantics for area geometries. More...
#include <ConsistentAreaTester.h>
Public Member Functions  
ConsistentAreaTester (geomgraph::GeometryGraph *newGeomGraph)  
geom::Coordinate &  getInvalidPoint () 
bool  isNodeConsistentArea () 
Check all nodes to see if their labels are consistent with area topology. More...  
bool  hasDuplicateRings () 
Checks that a geomgraph::GeometryGraph representing an area (a Polygon or MultiPolygon ) is consistent with the OGCSFS semantics for area geometries.
Checks include:
If an inconsistency if found the location of the problem is recorded. Checks that a geomgraph::GeometryGraph representing an area (a geom::Polygon or geom::MultiPolygon) has consistent semantics for area geometries. This check is required for any reasonable polygonal model (including the OGCSFS model, as well as models which allow ring selfintersection at single points)
Checks include:
If an inconsistency is found the location of the problem is recorded and is available to the caller.
geos::operation::valid::ConsistentAreaTester::ConsistentAreaTester  (  geomgraph::GeometryGraph *  newGeomGraph  ) 
Creates a new tester for consistent areas.
geomGraph  the topology graph of the area geometry. Caller keeps responsibility for its deletion 
geom::Coordinate& geos::operation::valid::ConsistentAreaTester::getInvalidPoint  (  ) 
null
if none was found bool geos::operation::valid::ConsistentAreaTester::hasDuplicateRings  (  ) 
Checks for two duplicate rings in an area. Duplicate rings are rings that are topologically equal (that is, which have the same sequence of points up to point order). If the area is topologically consistent (determined by calling the isNodeConsistentArea
, duplicate rings can be found by checking for EdgeBundles which contain more than one geomgraph::EdgeEnd. (This is because topologically consistent areas cannot have two rings sharing the same line segment, unless the rings are equal). The start point of one of the equal rings will be placed in invalidPoint.
bool geos::operation::valid::ConsistentAreaTester::isNodeConsistentArea  (  ) 
Check all nodes to see if their labels are consistent with area topology.
true
if this area has a consistent node labelling