114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
|
/**********************************************************************
|
||
|
|
*
|
||
|
|
* GEOS - Geometry Engine Open Source
|
||
|
|
* http://geos.osgeo.org
|
||
|
|
*
|
||
|
|
* Copyright (C) 2009 Sandro Santilli <strk@kbt.io>
|
||
|
|
*
|
||
|
|
* 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: noding/OrientedCoordinateArray.java rev. 1.1 (JTS-1.9)
|
||
|
|
*
|
||
|
|
**********************************************************************/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <geos/export.h>
|
||
|
|
|
||
|
|
#include <cstddef>
|
||
|
|
|
||
|
|
// Forward declarations
|
||
|
|
namespace geos {
|
||
|
|
namespace geom {
|
||
|
|
class CoordinateSequence;
|
||
|
|
}
|
||
|
|
namespace noding {
|
||
|
|
//class SegmentString;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace geos {
|
||
|
|
namespace noding { // geos.noding
|
||
|
|
|
||
|
|
/** \brief
|
||
|
|
* Allows comparing {@link geom::CoordinateSequence}s
|
||
|
|
* in an orientation-independent way.
|
||
|
|
*/
|
||
|
|
class GEOS_DLL OrientedCoordinateArray {
|
||
|
|
public:
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a new {@link OrientedCoordinateArray}
|
||
|
|
* for the given {@link geom::CoordinateSequence}.
|
||
|
|
*
|
||
|
|
* @param p_pts the coordinates to orient
|
||
|
|
*/
|
||
|
|
OrientedCoordinateArray(const geom::CoordinateSequence& p_pts)
|
||
|
|
:
|
||
|
|
pts(&p_pts),
|
||
|
|
orientationVar(orientation(p_pts))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
/** \brief
|
||
|
|
* Compares two {@link OrientedCoordinateArray}s for their
|
||
|
|
* relative order
|
||
|
|
*
|
||
|
|
* @return -1 this one is smaller
|
||
|
|
* @return 0 the two objects are equal
|
||
|
|
* @return 1 this one is greater
|
||
|
|
*
|
||
|
|
* In JTS, this is used automatically by ordered lists.
|
||
|
|
* In C++, operator< would be used instead....
|
||
|
|
*/
|
||
|
|
int compareTo(const OrientedCoordinateArray& o1) const;
|
||
|
|
|
||
|
|
bool operator==(const OrientedCoordinateArray& other) const;
|
||
|
|
|
||
|
|
struct GEOS_DLL HashCode {
|
||
|
|
std::size_t operator()(const OrientedCoordinateArray & oca) const;
|
||
|
|
};
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
static int compareOriented(const geom::CoordinateSequence& pts1,
|
||
|
|
bool orientation1,
|
||
|
|
const geom::CoordinateSequence& pts2,
|
||
|
|
bool orientation2);
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Computes the canonical orientation for a coordinate array.
|
||
|
|
*
|
||
|
|
* @param pts the array to test
|
||
|
|
* @return <code>true</code> if the points are oriented forwards
|
||
|
|
* @return <code>false</code> if the points are oriented in reverse
|
||
|
|
*/
|
||
|
|
static bool orientation(const geom::CoordinateSequence& pts);
|
||
|
|
|
||
|
|
/// Externally owned
|
||
|
|
const geom::CoordinateSequence* pts;
|
||
|
|
|
||
|
|
bool orientationVar;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/// Strict weak ordering operator for OrientedCoordinateArray
|
||
|
|
///
|
||
|
|
/// This is the C++ equivalent of JTS's compareTo
|
||
|
|
inline bool
|
||
|
|
operator< (const OrientedCoordinateArray& oca1,
|
||
|
|
const OrientedCoordinateArray& oca2)
|
||
|
|
{
|
||
|
|
return oca1.compareTo(oca2) < 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace geos.noding
|
||
|
|
} // namespace geos
|
||
|
|
|