62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
/* $Id$ */
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#ifndef DIRECTION_H
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#define DIRECTION_H
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/* Direction as commonly used in v->direction, 8 way. */
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typedef enum Direction {
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DIR_N = 0,
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DIR_NE = 1, /* Northeast, upper right on your monitor */
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DIR_E = 2,
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DIR_SE = 3,
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DIR_S = 4,
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DIR_SW = 5,
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DIR_W = 6,
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DIR_NW = 7,
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DIR_END,
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INVALID_DIR = 0xFF,
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} Direction;
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/* Direction commonly used as the direction of entering and leaving tiles, 4-way */
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typedef enum DiagDirection {
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DIAGDIR_NE = 0, /* Northeast, upper right on your monitor */
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DIAGDIR_SE = 1,
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DIAGDIR_SW = 2,
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DIAGDIR_NW = 3,
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DIAGDIR_END,
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INVALID_DIAGDIR = 0xFF,
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} DiagDirection;
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static inline DiagDirection ReverseDiagDir(DiagDirection d)
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{
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return (DiagDirection)(2 ^ d);
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}
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static inline DiagDirection DirToDiagDir(Direction dir)
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{
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return (DiagDirection)(dir >> 1);
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}
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static inline Direction DiagDirToDir(DiagDirection dir)
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{
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return (Direction)(dir * 2 + 1);
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}
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/* the 2 axis */
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typedef enum Axis {
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AXIS_X = 0,
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AXIS_Y = 1
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} Axis;
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static inline Axis DiagDirToAxis(DiagDirection d)
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{
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return (Axis)(d & 1);
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}
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#endif
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