Package org.locationtech.jts.algorithm
Class MinimumDiameter
- java.lang.Object
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- org.locationtech.jts.algorithm.MinimumDiameter
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public class MinimumDiameter extends java.lang.Object
Computes the minimum diameter of aGeometry
. The minimum diameter is defined to be the width of the smallest band that contains the geometry, where a band is a strip of the plane defined by two parallel lines. This can be thought of as the smallest hole that the geometry can be moved through, with a single rotation.The first step in the algorithm is computing the convex hull of the Geometry. If the input Geometry is known to be convex, a hint can be supplied to avoid this computation.
This class can also be used to compute:
- a line segment representing the minimum diameter
- the supporting line segment of the minimum diameter
- the minimum enclosing rectangle of the input geometry. The rectangle has width equal to the minimum diameter, and has one side parallel to the supporting segment. In degenerate cases the minimum enclosing geometry may be a LineString or a Point.
- Version:
- 1.7
- See Also:
ConvexHull
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Constructor Summary
Constructors Constructor Description MinimumDiameter(Geometry inputGeom)
Compute a minimum diameter for a givenGeometry
.MinimumDiameter(Geometry inputGeom, boolean isConvex)
Compute a minimum diameter for a giverGeometry
, with a hint if the Geometry is convex (e.g.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description LineString
getDiameter()
Gets aLineString
which is a minimum diameterdouble
getLength()
Gets the length of the minimum diameter of the input Geometrystatic Geometry
getMinimumDiameter(Geometry geom)
Gets the length of the minimum diameter enclosing a geometryGeometry
getMinimumRectangle()
Gets the minimum rectangularPolygon
which encloses the input geometry.static Geometry
getMinimumRectangle(Geometry geom)
Gets the minimum rectangularPolygon
which encloses the input geometry.LineString
getSupportingSegment()
Gets the segment forming the base of the minimum diameterCoordinate
getWidthCoordinate()
Gets theCoordinate
forming one end of the minimum diameter
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Constructor Detail
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MinimumDiameter
public MinimumDiameter(Geometry inputGeom)
Compute a minimum diameter for a givenGeometry
.- Parameters:
inputGeom
- a Geometry
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MinimumDiameter
public MinimumDiameter(Geometry inputGeom, boolean isConvex)
Compute a minimum diameter for a giverGeometry
, with a hint if the Geometry is convex (e.g. a convex Polygon or LinearRing, or a two-point LineString, or a Point).- Parameters:
inputGeom
- a Geometry which is convexisConvex
-true
if the input geometry is convex
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Method Detail
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getMinimumRectangle
public static Geometry getMinimumRectangle(Geometry geom)
Gets the minimum rectangularPolygon
which encloses the input geometry. The rectangle has width equal to the minimum diameter, and a longer length. If the convex hull of the input is degenerate (a line or point) aLineString
orPoint
is returned.The minimum rectangle can be used as an extremely generalized representation for the given geometry.
- Parameters:
geom
- the geometry- Returns:
- the minimum rectangle enclosing the geometry
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getMinimumDiameter
public static Geometry getMinimumDiameter(Geometry geom)
Gets the length of the minimum diameter enclosing a geometry- Parameters:
geom
- the geometry- Returns:
- the length of the minimum diameter of the geometry
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getLength
public double getLength()
Gets the length of the minimum diameter of the input Geometry- Returns:
- the length of the minimum diameter
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getWidthCoordinate
public Coordinate getWidthCoordinate()
Gets theCoordinate
forming one end of the minimum diameter- Returns:
- a coordinate forming one end of the minimum diameter
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getSupportingSegment
public LineString getSupportingSegment()
Gets the segment forming the base of the minimum diameter- Returns:
- the segment forming the base of the minimum diameter
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getDiameter
public LineString getDiameter()
Gets aLineString
which is a minimum diameter- Returns:
- a
LineString
which is a minimum diameter
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getMinimumRectangle
public Geometry getMinimumRectangle()
Gets the minimum rectangularPolygon
which encloses the input geometry. The rectangle has width equal to the minimum diameter, and a longer length. If the convex hull of the input is degenerate (a line or point) aLineString
orPoint
is returned.The minimum rectangle can be used as an extremely generalized representation for the given geometry.
- Returns:
- the minimum rectangle enclosing the input (or a line or point if degenerate)
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