/usr/include/geos/operation/distance/DistanceOp.h is in libgeos-dev 3.2.2-3ubuntu1.
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* $Id: DistanceOp.h 2560 2009-06-08 10:29:54Z strk $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* Copyright (C) 2006 Refractions Research Inc.
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU Lesser General Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
*
* Last port: operation/distance/DistanceOp.java rev 1.21 (JTS-1.10)
*
**********************************************************************/
#ifndef GEOS_OP_DISTANCE_DISTANCEOP_H
#define GEOS_OP_DISTANCE_DISTANCEOP_H
#include <geos/export.h>
#include <geos/algorithm/PointLocator.h> // for composition
#include <vector>
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
class Polygon;
class LineString;
class Point;
class Geometry;
class CoordinateSequence;
}
namespace operation {
namespace distance {
class GeometryLocation;
}
}
}
namespace geos {
namespace operation { // geos::operation
namespace distance { // geos::operation::distance
/**
* \brief
* Find two points on two {@link Geometry}s which lie
* within a given distance, or else are the nearest points
* on the geometries (in which case this also
* provides the distance between the geometries).
*
* The distance computation also finds a pair of points in the
* input geometries which have the minimum distance between them.
* If a point lies in the interior of a line segment,
* the coordinate computed is a close
* approximation to the exact point.
*
* The algorithms used are straightforward O(n^2)
* comparisons. This worst-case performance could be improved on
* by using Voronoi techniques or spatial indexes.
*
*/
class GEOS_DLL DistanceOp {
public:
/**
* \brief
* Compute the distance between the nearest points of two geometries.
*
* @param g0 a {@link Geometry}
* @param g1 another {@link Geometry}
* @return the distance between the geometries
*/
static double distance(const geom::Geometry& g0,
const geom::Geometry& g1);
/// @deprecated, use the version taking references
static double distance(const geom::Geometry *g0,
const geom::Geometry *g1);
/**
* \brief
* Test whether two geometries lie within a given distance of
* each other.
*
* @param g0 a {@link Geometry}
* @param g1 another {@link Geometry}
* @param distance the distance to test
* @return true if g0.distance(g1) <= distance
*/
static bool isWithinDistance(const geom::Geometry& g0,
const geom::Geometry& g1,
double distance);
/**
* Compute the the nearest points of two geometries.
*
* The points are presented in the same order as the input Geometries.
*
* @param g0 a {@link Geometry}
* @param g1 another {@link Geometry}
*
* @return the nearest points in the geometries, ownership to caller.
* A NULL return means one of the geometries is empty.
*
*/
static geom::CoordinateSequence* nearestPoints(
const geom::Geometry *g0,
const geom::Geometry *g1);
/**
* Compute the the closest points of two geometries.
*
* The points are presented in the same order as the input Geometries.
*
* @param g0 a {@link Geometry}
* @param g1 another {@link Geometry}
*
* @return the closest points in the geometries, ownership to caller.
* A NULL return means one of the geometries is empty.
*
* @deprecated renamed to nearestPoints
*/
static geom::CoordinateSequence* closestPoints(
const geom::Geometry *g0,
const geom::Geometry *g1);
/// @deprecated use the one taking references
DistanceOp(const geom::Geometry *g0, const geom::Geometry *g1);
/**
* \brief
* Constructs a DistanceOp that computes the distance and
* nearest points between the two specified geometries.
*
* @param g0 a Geometry
* @param g1 a Geometry
*/
DistanceOp(const geom::Geometry& g0, const geom::Geometry& g1);
/**
* \brief
* Constructs a DistanceOp that computes the distance and nearest
* points between the two specified geometries.
*
* @param g0 a Geometry
* @param g1 a Geometry
* @param terminateDistance the distance on which to terminate
* the search
*/
DistanceOp(const geom::Geometry& g0, const geom::Geometry& g1,
double terminateDistance);
~DistanceOp();
/**
* Report the distance between the closest points on the input geometries.
*
* @return the distance between the geometries
*/
double distance();
/**
* Report the coordinates of the closest points in the input geometries.
* The points are presented in the same order as the input Geometries.
*
* @return a pair of {@link Coordinate}s of the closest points
* as a newly allocated object (ownership to caller)
*
* @deprecated renamed to nearestPoints
*/
geom::CoordinateSequence* closestPoints();
/**
* Report the coordinates of the nearest points in the input geometries.
* The points are presented in the same order as the input Geometries.
*
* @return a pair of {@link Coordinate}s of the nearest points
* as a newly allocated object (ownership to caller)
*
*/
geom::CoordinateSequence* nearestPoints();
private:
/**
* Report the locations of the closest points in the input geometries.
* The locations are presented in the same order as the input
* Geometries.
*
* @return a pair of {@link GeometryLocation}s for the closest points.
* Ownership of returned object is left to this instance and
* it's reference will be alive for the whole lifetime of it.
*
* NOTE: this is public in JTS, but we aim at API reduction here...
*
*/
std::vector<GeometryLocation*>* nearestLocations();
// input (TODO: use two references instead..)
std::vector<geom::Geometry const*> geom;
double terminateDistance;
// working
algorithm::PointLocator ptLocator;
// TODO: use auto_ptr
std::vector<GeometryLocation*> *minDistanceLocation;
double minDistance;
// memory management
std::vector<geom::Coordinate *> newCoords;
void updateMinDistance(std::vector<GeometryLocation*>& locGeom,
bool flip);
void computeMinDistance();
void computeContainmentDistance();
void computeInside(std::vector<GeometryLocation*> *locs,
const std::vector<const geom::Polygon*>& polys,
std::vector<GeometryLocation*> *locPtPoly);
void computeInside(GeometryLocation *ptLoc,
const geom::Polygon *poly,
std::vector<GeometryLocation*> *locPtPoly);
/**
* Computes distance between facets (lines and points)
* of input geometries.
*/
void computeFacetDistance();
void computeMinDistanceLines(
const std::vector<const geom::LineString*>& lines0,
const std::vector<const geom::LineString*>& lines1,
std::vector<GeometryLocation*>& locGeom);
void computeMinDistancePoints(
const std::vector<const geom::Point*>& points0,
const std::vector<const geom::Point*>& points1,
std::vector<GeometryLocation*>& locGeom);
void computeMinDistanceLinesPoints(
const std::vector<const geom::LineString*>& lines0,
const std::vector<const geom::Point*>& points1,
std::vector<GeometryLocation*>& locGeom);
void computeMinDistance(const geom::LineString *line0,
const geom::LineString *line1,
std::vector<GeometryLocation*>& locGeom);
void computeMinDistance(const geom::LineString *line,
const geom::Point *pt,
std::vector<GeometryLocation*>& locGeom);
};
} // namespace geos::operation::distance
} // namespace geos::operation
} // namespace geos
#endif // GEOS_OP_DISTANCE_DISTANCEOP_H
/**********************************************************************
* $Log$
* Revision 1.1 2006/03/21 17:55:01 strk
* opDistance.h header split
*
**********************************************************************/
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