public class Polygonizer extends Object
Geometry
s which contain linework that
represents the edges of a planar graph.
All types of Geometry are accepted as input;
the constituent linework is extracted as the edges to be polygonized.
The processed edges must be correctly noded; that is, they must only meet
at their endpoints. Polygonization will accept incorrectly noded input
but will not form polygons from nonnoded edges,
and reports them as errors.
The Polygonizer reports the follow kinds of errors:
Dangles
 edges which have one or both ends which are not incident on another edge endpoint
Cut Edges
 edges which are connected at both ends but which do not form part of polygon
Invalid Ring Lines
 edges which form rings which are invalid
(e.g. the component lines contain a selfintersection)
Polygonizer(boolean)
constructor allows
extracting only polygons which form a valid polygonal result.
The set of extracted polygons is guaranteed to be edgedisjoint.
This is useful where it is known that the input lines form a
valid polygonal geometry (which may include holes or nested polygons).Constructor and Description 

Polygonizer()
Creates a polygonizer that extracts all polygons.

Polygonizer(boolean extractOnlyPolygonal)
Creates a polygonizer, specifying whether a valid polygonal geometry must be created.

Modifier and Type  Method and Description 

void 
add(Collection geomList)
Adds a collection of geometries to the edges to be polygonized.

void 
add(Geometry g)
Add a
Geometry to the edges to be polygonized. 
Collection 
getCutEdges()
Gets the list of cut edges found during polygonization.

Collection 
getDangles()
Gets the list of dangling lines found during polygonization.

Geometry 
getGeometry()
Gets a geometry representing the polygons formed by the polygonization.

Collection 
getInvalidRingLines()
Gets the list of lines forming invalid rings found during polygonization.

Collection 
getPolygons()
Gets the list of polygons formed by the polygonization.

void 
setCheckRingsValid(boolean isCheckingRingsValid)
Allows disabling the valid ring checking,
to optimize situations where invalid rings are not expected.

public Polygonizer()
public Polygonizer(boolean extractOnlyPolygonal)
true
then areas may be discarded in order to
ensure that the extracted geometry is a valid polygonal geometry.extractOnlyPolygonal
 true if a valid polygonal geometry should be extractedpublic void add(Collection geomList)
geomList
 a list of Geometry
s with linework to be polygonizedpublic void add(Geometry g)
Geometry
to the edges to be polygonized.
May be called multiple times.
Any dimension of Geometry may be added;
the constituent linework will be extracted and usedg
 a Geometry
with linework to be polygonizedpublic void setCheckRingsValid(boolean isCheckingRingsValid)
The default is true
.
isCheckingRingsValid
 true if generated rings should be checked for validitypublic Collection getPolygons()
Polygon
spublic Geometry getGeometry()
Polygonal
geometry.public Collection getDangles()
LineString
s which are danglespublic Collection getCutEdges()
LineString
s which are cut edgespublic Collection getInvalidRingLines()
LineString
s which form invalid ringsCopyright © 2020. All rights reserved.