1

/* $Id$ */

     2

     3

#ifndef DIRECTION_H

     4

#define DIRECTION_H

     5

     6

/* Direction as commonly used in v->direction, 8 way. */

     7

typedef enum Direction {

     8

	DIR_N   = 0,

     9

	DIR_NE  = 1,      /* Northeast, upper right on your monitor */

    10

	DIR_E   = 2,

    11

	DIR_SE  = 3,

    12

	DIR_S   = 4,

    13

	DIR_SW  = 5,

    14

	DIR_W   = 6,

    15

	DIR_NW  = 7,

    16

	DIR_END,

    17

	INVALID_DIR = 0xFF,

    18

} Direction;

    19

    20

    21

/* Direction commonly used as the direction of entering and leaving tiles, 4-way */

    22

typedef enum DiagDirection {

    23

	DIAGDIR_NE  = 0,      /* Northeast, upper right on your monitor */

    24

	DIAGDIR_SE  = 1,

    25

	DIAGDIR_SW  = 2,

    26

	DIAGDIR_NW  = 3,

    27

	DIAGDIR_END,

    28

	INVALID_DIAGDIR = 0xFF,

    29

} DiagDirection;

    30

    31

static inline DiagDirection ReverseDiagDir(DiagDirection d)

    32

{

    33

	return 2 ^ d;

    34

}

    35

    36

    37

static inline DiagDirection DirToDiagdir(Direction dir)

    38

{

    39

	return (DiagDirection)(dir >> 1);

    40

}

    41

    42

    43

/* the 2 axis */

    44

typedef enum Axis {

    45

	AXIS_X = 0,

    46

	AXIS_Y = 1

    47

} Axis;

    48

    49

#endif