public class OverlayOp extends GeometryGraphOperation
Geometry
s. The overlay
can be used to determine any boolean combination of the geometries.Modifier and Type | Field and Description |
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static int |
DIFFERENCE
The code for the Difference overlay operation.
|
static int |
INTERSECTION
The code for the Intersection overlay operation.
|
static int |
SYMDIFFERENCE
The code for the Symmetric Difference overlay operation.
|
static int |
UNION
The code for the Union overlay operation.
|
Constructor and Description |
---|
OverlayOp(Geometry g0,
Geometry g1)
Constructs an instance to compute a single overlay operation
for the given geometries.
|
Modifier and Type | Method and Description |
---|---|
static Geometry |
createEmptyResult(int overlayOpCode,
Geometry a,
Geometry b,
GeometryFactory geomFact)
Creates an empty result geometry of the appropriate dimension,
based on the given overlay operation and the dimensions of the inputs.
|
PlanarGraph |
getGraph()
Gets the graph constructed to compute the overlay.
|
Geometry |
getResultGeometry(int overlayOpCode)
Gets the result of the overlay for a given overlay operation.
|
boolean |
isCoveredByA(Coordinate coord)
Tests if an L edge should be included in the result or not.
|
boolean |
isCoveredByLA(Coordinate coord)
Tests if a point node should be included in the result or not.
|
static boolean |
isResultOfOp(int loc0,
int loc1,
int overlayOpCode)
Tests whether a point with given
Location s
relative to two geometries is contained in
the result of overlaying the geometries using
a given overlay operation. |
static boolean |
isResultOfOp(Label label,
int opCode)
Tests whether a point with a given topological
Label
relative to two geometries is contained in
the result of overlaying the geometries using
a given overlay operation. |
static Geometry |
overlayOp(Geometry geom0,
Geometry geom1,
int opCode)
Computes an overlay operation for
the given geometry arguments.
|
getArgGeometry
public static final int INTERSECTION
public static final int UNION
public static final int DIFFERENCE
public static final int SYMDIFFERENCE
public static Geometry overlayOp(Geometry geom0, Geometry geom1, int opCode)
geom0
- the first geometry argumentgeom1
- the second geometry argumentopCode
- the code for the desired overlay operationTopologyException
- if a robustness problem is encounteredpublic static boolean isResultOfOp(Label label, int opCode)
Label
relative to two geometries is contained in
the result of overlaying the geometries using
a given overlay operation.
The method handles arguments of Location.NONE
correctly
label
- the topological label of the pointopCode
- the code for the overlay operation to testpublic static boolean isResultOfOp(int loc0, int loc1, int overlayOpCode)
Location
s
relative to two geometries is contained in
the result of overlaying the geometries using
a given overlay operation.
The method handles arguments of Location.NONE
correctly
loc0
- the code for the location in the first geometryloc1
- the code for the location in the second geometryoverlayOpCode
- the code for the overlay operation to testpublic Geometry getResultGeometry(int overlayOpCode)
Note: this method can be called once only.
overlayOpCode
- the overlay operation to performTopologyException
- if a robustness problem is encounteredpublic PlanarGraph getGraph()
public boolean isCoveredByLA(Coordinate coord)
coord
- the point coordinatepublic boolean isCoveredByA(Coordinate coord)
coord
- the point coordinatepublic static Geometry createEmptyResult(int overlayOpCode, Geometry a, Geometry b, GeometryFactory geomFact)
The empty result is constructed using the following rules:
INTERSECTION
- result has the dimension of the lowest input dimension
UNION
- result has the dimension of the highest input dimension
DIFFERENCE
- result has the dimension of the left-hand input
SYMDIFFERENCE
- result has the dimension of the highest input dimension
(since the symmetric Difference is the union of the differences).
overlayOpCode
- the code for the overlay operation being performeda
- an input geometryb
- an input geometrygeomFact
- the geometry factory being used for the operationCopyright © 2022. All rights reserved.