121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
/**********************************************************************
|
|
*
|
|
* GEOS - Geometry Engine Open Source
|
|
* http://geos.osgeo.org
|
|
*
|
|
* Copyright (C) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
|
|
*
|
|
* 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.
|
|
*
|
|
**********************************************************************/
|
|
|
|
#pragma once
|
|
|
|
#include <geos/operation/overlayng/OverlayLabel.h>
|
|
#include <geos/operation/overlayng/EdgeKey.h>
|
|
#include <geos/operation/overlayng/Edge.h>
|
|
#include <geos/geom/Coordinate.h>
|
|
#include <geos/export.h>
|
|
|
|
|
|
|
|
namespace geos { // geos.
|
|
namespace operation { // geos.operation
|
|
namespace overlayng { // geos.operation.overlayng
|
|
|
|
|
|
using geos::geom::Coordinate;
|
|
|
|
/**
|
|
* A key for sorting and comparing edges in a noded arrangement.
|
|
* Relies on the fact that in a correctly noded arrangement
|
|
* edges are identical (up to direction)
|
|
* iff they have their first segment in common.
|
|
*
|
|
* @author mdavis
|
|
*
|
|
*/
|
|
class GEOS_DLL EdgeKey {
|
|
|
|
private:
|
|
|
|
// Members
|
|
double p0x;
|
|
double p0y;
|
|
double p1x;
|
|
double p1y;
|
|
|
|
// Methods
|
|
void initPoints(const Edge* edge)
|
|
{
|
|
bool direction = edge->direction();
|
|
if (direction) {
|
|
init(edge->getCoordinate(0),
|
|
edge->getCoordinate(1));
|
|
}
|
|
else {
|
|
std::size_t len = edge->size();
|
|
init(edge->getCoordinate(len - 1),
|
|
edge->getCoordinate(len - 2));
|
|
}
|
|
}
|
|
|
|
void init(const geom::Coordinate& p0, const geom::Coordinate& p1)
|
|
{
|
|
p0x = p0.x;
|
|
p0y = p0.y;
|
|
p1x = p1.x;
|
|
p1y = p1.y;
|
|
}
|
|
|
|
|
|
public:
|
|
|
|
EdgeKey(const Edge* edge)
|
|
{
|
|
initPoints(edge);
|
|
}
|
|
|
|
int compareTo(const EdgeKey* ek) const
|
|
{
|
|
if (p0x < ek->p0x) return -1;
|
|
if (p0x > ek->p0x) return 1;
|
|
if (p0y < ek->p0y) return -1;
|
|
if (p0y > ek->p0y) return 1;
|
|
// first points are equal, compare second
|
|
if (p1x < ek->p1x) return -1;
|
|
if (p1x > ek->p1x) return 1;
|
|
if (p1y < ek->p1y) return -1;
|
|
if (p1y > ek->p1y) return 1;
|
|
return 0;
|
|
}
|
|
|
|
bool equals(const EdgeKey* ek) const
|
|
{
|
|
return p0x == ek->p0x
|
|
&& p0y == ek->p0y
|
|
&& p1x == ek->p1x
|
|
&& p1y == ek->p1y;
|
|
}
|
|
|
|
friend bool operator<(const EdgeKey& ek1, const EdgeKey& ek2)
|
|
{
|
|
return ek1.compareTo(&ek2) < 0;
|
|
};
|
|
|
|
friend bool operator==(const EdgeKey& ek1, const EdgeKey& ek2)
|
|
{
|
|
return ek1.equals(&ek2);
|
|
};
|
|
|
|
};
|
|
|
|
|
|
} // namespace geos.operation.overlayng
|
|
} // namespace geos.operation
|
|
} // namespace geos
|
|
|