109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
|
/**********************************************************************
|
||
|
|
*
|
||
|
|
* GEOS - Geometry Engine Open Source
|
||
|
|
* http://geos.osgeo.org
|
||
|
|
*
|
||
|
|
* Copyright (C) 2005-2011 Refractions Research Inc.
|
||
|
|
* Copyright (C) 2001-2002 Vivid Solutions 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: algorithm/PointLocator.java 95fbe34b (JTS-1.15.2-SNAPSHOT)
|
||
|
|
*
|
||
|
|
**********************************************************************/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <geos/export.h>
|
||
|
|
#include <geos/geom/Location.h> // for inlines
|
||
|
|
|
||
|
|
// Forward declarations
|
||
|
|
namespace geos {
|
||
|
|
namespace geom {
|
||
|
|
class CoordinateXY;
|
||
|
|
class Geometry;
|
||
|
|
class LinearRing;
|
||
|
|
class LineString;
|
||
|
|
class Polygon;
|
||
|
|
class Point;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace geos {
|
||
|
|
namespace algorithm { // geos::algorithm
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \class PointLocator
|
||
|
|
*
|
||
|
|
* \brief
|
||
|
|
* Computes the topological relationship (Location)
|
||
|
|
* of a single point to a Geometry.
|
||
|
|
*
|
||
|
|
* The algorithm obeys the SFS boundaryDetermination rule to correctly determine
|
||
|
|
* whether the point lies on the boundary or not.
|
||
|
|
*
|
||
|
|
* Notes:
|
||
|
|
* - instances of this class are not reentrant.
|
||
|
|
* - LinearRing objects do not enclose any area
|
||
|
|
* (points inside the ring are still in the EXTERIOR of the ring.)
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
class GEOS_DLL PointLocator {
|
||
|
|
public:
|
||
|
|
PointLocator() {}
|
||
|
|
~PointLocator() {}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Computes the topological relationship (Location) of a single point
|
||
|
|
* to a Geometry. It handles both single-element and multi-element Geometries.
|
||
|
|
* The algorithm for multi-part Geometriestakes into account the SFS
|
||
|
|
* Boundary Determination rule.
|
||
|
|
*
|
||
|
|
* @return the Location of the point relative to the input Geometry
|
||
|
|
*/
|
||
|
|
geom::Location locate(const geom::CoordinateXY& p, const geom::Geometry* geom);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convenience method to test a point for intersection with
|
||
|
|
* a Geometry
|
||
|
|
*
|
||
|
|
* @param p the coordinate to test
|
||
|
|
* @param geom the Geometry to test
|
||
|
|
* @return <code>true</code> if the point is in the interior or boundary of the Geometry
|
||
|
|
*/
|
||
|
|
bool
|
||
|
|
intersects(const geom::CoordinateXY& p, const geom::Geometry* geom)
|
||
|
|
{
|
||
|
|
return locate(p, geom) != geom::Location::EXTERIOR;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
bool isIn; // true if the point lies in or on any Geometry element
|
||
|
|
|
||
|
|
int numBoundaries; // the number of sub-elements whose boundaries the point lies in
|
||
|
|
|
||
|
|
void computeLocation(const geom::CoordinateXY& p, const geom::Geometry* geom);
|
||
|
|
|
||
|
|
void updateLocationInfo(geom::Location loc);
|
||
|
|
|
||
|
|
geom::Location locate(const geom::CoordinateXY& p, const geom::Point* pt);
|
||
|
|
|
||
|
|
geom::Location locate(const geom::CoordinateXY& p, const geom::LineString* l);
|
||
|
|
|
||
|
|
geom::Location locateInPolygonRing(const geom::CoordinateXY& p, const geom::LinearRing* ring);
|
||
|
|
|
||
|
|
geom::Location locate(const geom::CoordinateXY& p, const geom::Polygon* poly);
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace geos::algorithm
|
||
|
|
} // namespace geos
|
||
|
|
|
||
|
|
|