/* -*- C++ -*-
 * Copyright ©2004 Hugo Mills <hugo@carfax.org.uk>
 *
 * This software is distributed under the terms of the GNU GPL v3
 * For more information on the GPL, see the file COPYING or 
 * visit http://www.gnu.org/
 *
 * This software is distributed without warranty
 */

#ifndef CROSSING_H
#define CROSSING_H

#include "direction.h"
#include "coordinate.h"

class Crossing
{
public:
	Crossing() : _pos(-1, -1), _d(), _isc(true) { }
	Crossing(int x, int y, Direction d)
		: _pos(x, y), _d(d), _isc(false) { }
	Crossing(int x, int y)
		: _pos(x, y), _d(0), _isc(true) { }
	Crossing(const iCoordinate& c)
		: _pos(c), _d(0), _isc(true) { }
	Crossing(const iCoordinate& c, Direction d)
		: _pos(c), _d(d), _isc(false) { }

	iCoordinate start(void) const { return _pos; }
	iCoordinate end(void) const;
	const iCoordinate& pos(void) const { return _pos; }

	Crossing opp(void) const;

	bool operator==(const Crossing& c) const;

	bool _isc;
	iCoordinate _pos;
	Direction _d;
};

std::ostream& operator<<(std::ostream& o, const Crossing& c);

class Diff
{
public:
	Diff(int x, int y, int d)
		: _pos(x, y), _d(d), _isc(false) { }
	Diff(int x, int y)
		: _pos(x, y), _d(0), _isc(true) { }

	bool isc(void) const { return _isc; }
	int x(void) const { return _pos.x; }
	int y(void) const { return _pos.y; }
	iCoordinate pos(void) const { return _pos; }
	Direction d(void) const { return _d; }

private:
	bool _isc;
	iCoordinate _pos;
	Direction _d;
};

Crossing operator+(const Crossing& c, const Diff& d);

#endif