MicropolisEngine/src/position.h

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/* position.h
 *
 * Micropolis, Unix Version.  This game was released for the Unix platform
 * in or about 1990 and has been modified for inclusion in the One Laptop
 * Per Child program.  Copyright (C) 1989 - 2007 Electronic Arts Inc.  If
 * you need assistance with this program, you may contact:
 *   http://wiki.laptop.org/go/Micropolis  or email  micropolis@laptop.org.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 *             ADDITIONAL TERMS per GNU GPL Section 7
 *
 * No trademark or publicity rights are granted.  This license does NOT
 * give you any right, title or interest in the trademark SimCity or any
 * other Electronic Arts trademark.  You may not distribute any
 * modification of this program using the trademark SimCity or claim any
 * affliation or association with Electronic Arts Inc. or its employees.
 *
 * Any propagation or conveyance of this program must include this
 * copyright notice and these terms.
 *
 * If you convey this program (or any modifications of it) and assume
 * contractual liability for the program to recipients of it, you agree
 * to indemnify Electronic Arts for any liability that those contractual
 * assumptions impose on Electronic Arts.
 *
 * You may not misrepresent the origins of this program; modified
 * versions of the program must be marked as such and not identified as
 * the original program.
 *
 * This disclaimer supplements the one included in the General Public
 * License.  TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, THIS
 * PROGRAM IS PROVIDED TO YOU "AS IS," WITH ALL FAULTS, WITHOUT WARRANTY
 * OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK.  THE ENTIRE RISK OF
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 * JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF OR LIMITATIONS ON IMPLIED
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 * CONSUMER, SO SOME OR ALL OF THE ABOVE EXCLUSIONS AND LIMITATIONS MAY
 * NOT APPLY TO YOU.
 */

#ifndef H_POSITION
#define H_POSITION

enum Direction2 {
    DIR2_INVALID,    
    DIR2_NORTH,      
    DIR2_NORTH_EAST, 
    DIR2_EAST,       
    DIR2_SOUTH_EAST, 
    DIR2_SOUTH,      
    DIR2_SOUTH_WEST, 
    DIR2_WEST,       
    DIR2_NORTH_WEST, 

    DIR2_BEGIN = DIR2_NORTH,        
    DIR2_END = DIR2_NORTH_WEST + 1, 
};

static inline Direction2 increment45(Direction2 dir, int count = 1)
{
    return (Direction2)(dir + count);
}


static inline Direction2 increment90(Direction2 dir)
{
    return increment45(dir, 2);
}

static inline Direction2 rotate45(Direction2 dir, int count = 1)
{
    return (Direction2)(((dir - DIR2_NORTH + count) & 7) + DIR2_NORTH);
}

static inline Direction2 rotate90(Direction2 dir)
{
    return rotate45(dir, 2);
}

static inline Direction2 rotate180(Direction2 dir)
{
    return rotate45(dir, 4);
}


class Position {

public:

    Position();
    Position(int x, int y);
    Position(const Position &pos);
    Position(const Position &pos, Direction2 dir);
    Position(const Position &pos, int dx, int dy);
    Position &operator=(const Position &pos);

    bool move(Direction2 dir);
    inline bool testBounds();

    int posX; 
    int posY; 
};


inline bool Position::testBounds()
{
    return (this->posX >= 0 && this->posX < WORLD_W
                && this->posY >= 0 && this->posY < WORLD_H);
}

inline bool operator<(const Position &pos1, const Position &pos2)
{
    if (pos1.posX != pos2.posX) return pos1.posX < pos2.posX;
    return pos1.posY < pos2.posY;
}

#endif

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