File: widelands_geometry.cc

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/*
 * Copyright (C) 2006-2015 by the Widelands Development Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include "logic/widelands_geometry.h"

namespace Widelands {

Coords::Coords() {
}

Coords::Coords(const int16_t nx, const int16_t ny) : x(nx), y(ny) {
}

bool Coords::operator==(const Coords& other) const {
	return x == other.x && y == other.y;
}

bool Coords::operator!=(const Coords& other) const {
	return !(*this == other);
}

Coords::operator bool() const {
	return *this != null();
}

void Coords::reorigin(Coords new_origin, const Extent& extent) {
	if (*this) {
		if (y < new_origin.y)
			y += extent.h;
		y -= new_origin.y;
		if ((y & 1) && (new_origin.y & 1) && ++new_origin.x == extent.w)
			new_origin.x = 0;
		if (x < new_origin.x)
			x += extent.w;
		x -= new_origin.x;
	}
}

// static
Coords Coords::null() {
	return Coords(-1, -1);
}

// Hash coordinates to use them as keys in a container
uint32_t Coords::hash() const {
	return x << 16 | y;
}

// Unhash coordinates so they can be gotten from a container
Coords Coords::unhash(uint32_t hash) {
	Coords coords;
	coords.x = hash >> 16;  // is cast needed here???
	coords.y = hash;
	return coords;
}

}  // namespace Widelands