EdgeKey.h
/**********************************************************************
*
* 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
class GEOS_DLL EdgeKey {
using Coordinate = geos::geom::Coordinate;
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
geos::geom::Coordinate
Coordinate is the lightweight class used to store coordinates.
Definition Coordinate.h:217
geos::operation::overlayng::Edge
Definition operation/overlayng/Edge.h:55
geos::operation
Provides classes for implementing operations on geometries.
Definition CleanCoverage.h:34
geos
Basic namespace for all GEOS functionalities.
Definition geos.h:38