author | tron |
Mon, 06 Mar 2006 20:55:24 +0000 | |
changeset 3154 | a8fffb204d0e |
parent 3153 | 301c1d71122b |
child 3157 | 40de8616c04c |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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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 |