org.h2gis.functions.spatial.mesh

Class FullConvexHull

java.lang.Object

org.h2gis.functions.spatial.mesh.FullConvexHull

public class FullConvexHull
extends Object

Computes the convex hull of a Geometry. The convex hull is the smallest convex Geometry that contains all the points in the input Geometry.

Uses the Graham Scan algorithm. For the workaround of Poly2Tri the convex hull must not be simplified

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
FullConvexHull(org.locationtech.jts.geom.Coordinate[] pts, org.locationtech.jts.geom.GeometryFactory geomFactory) Create a new convex hull construction for the input Coordinate array.
FullConvexHull(org.locationtech.jts.geom.Geometry geometry) Create a new convex hull construction for the input Geometry.

Method Summary

Modifier and Type	Method and Description
org.locationtech.jts.geom.Geometry	getConvexHull() Returns a Geometry that represents the convex hull of the input geometry.
protected org.locationtech.jts.geom.Coordinate[]	toCoordinateArray(Stack stack) An alternative to Stack.toArray, which is not present in earlier versions of Java.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FullConvexHull

public FullConvexHull(org.locationtech.jts.geom.Geometry geometry)

Create a new convex hull construction for the input Geometry.

Parameters:

geometry -

FullConvexHull

public FullConvexHull(org.locationtech.jts.geom.Coordinate[] pts,
                      org.locationtech.jts.geom.GeometryFactory geomFactory)

Create a new convex hull construction for the input Coordinate array.

Method Detail

getConvexHull

public org.locationtech.jts.geom.Geometry getConvexHull()

Returns a Geometry that represents the convex hull of the input geometry. The returned geometry contains the minimal number of points needed to represent the convex hull. In particular, no more than two consecutive points will be collinear.

Returns:

if the convex hull contains 3 or more points, a Polygon; 2 points, a LineString; 1 point, a Point; 0 points, an empty GeometryCollection.

toCoordinateArray

protected org.locationtech.jts.geom.Coordinate[] toCoordinateArray(Stack stack)

An alternative to Stack.toArray, which is not present in earlier versions of Java.

Parameters:

stack -