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.
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 * 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/>.
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 */
 
#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