com.vividsolutions.jts.operation.valid
Class ConsistentAreaTester
java.lang.Object
com.vividsolutions.jts.operation.valid.ConsistentAreaTester
public class ConsistentAreaTester
extends java.lang.Object
Checks that a
GeometryGraph
representing an area
(a
Polygon
or
MultiPolygon
)
is consistent with the SFS semantics for area geometries.
Checks include:
- testing for rings which self-intersect (both properly
and at nodes)
- testing for duplicate rings
If an inconsistency if found the location of the problem
is recorded.
ConsistentAreaTester
public ConsistentAreaTester(GeometryGraph geomGraph)
getInvalidPoint
public Coordinate getInvalidPoint()
- the intersection point, or
null
if none was found
hasDuplicateRings
public boolean 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 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.
- true if this area Geometry is topologically consistent but has two duplicate rings
isNodeConsistentArea
public boolean isNodeConsistentArea()