author | tron |
Sat, 22 Jul 2006 08:59:52 +0000 | |
changeset 4158 | a8f7265a6fd0 |
parent 3953 | db302c2d1a2a |
child 4666 | 850b5b6e4bac |
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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static inline Direction ReverseDir(Direction d) |
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{ |
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return (Direction)(4 ^ d); |
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} |
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typedef enum DirDiff { |
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DIRDIFF_SAME = 0, |
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DIRDIFF_45RIGHT = 1, |
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DIRDIFF_90RIGHT = 2, |
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DIRDIFF_REVERSE = 4, |
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DIRDIFF_90LEFT = 6, |
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DIRDIFF_45LEFT = 7 |
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} DirDiff; |
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static inline DirDiff DirDifference(Direction d0, Direction d1) |
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{ |
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return (DirDiff)((d0 + 8 - d1) % 8); |
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} |
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static inline DirDiff ChangeDirDiff(DirDiff d, DirDiff delta) |
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{ |
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return (DirDiff)((d + delta) % 8); |
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} |
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static inline Direction ChangeDir(Direction d, DirDiff delta) |
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{ |
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return (Direction)((d + delta) % 8); |
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} |
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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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typedef enum DiagDirDiff { |
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DIAGDIRDIFF_SAME = 0, |
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DIAGDIRDIFF_90RIGHT = 1, |
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DIAGDIRDIFF_REVERSE = 2, |
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DIAGDIRDIFF_90LEFT = 3 |
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} DiagDirDiff; |
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static inline DiagDirection ChangeDiagDir(DiagDirection d, DiagDirDiff delta) |
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{ |
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return (DiagDirection)((d + delta) % 4); |
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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_END |
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} Axis; |
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static inline Axis OtherAxis(Axis a) |
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return (Axis)(a ^ 1); |
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} |
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static inline Axis DiagDirToAxis(DiagDirection d) |
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return (Axis)(d & 1); |
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} |
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/* |
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* Converts an Axis to a DiagDirection |
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* Points always in the positive direction, i.e. S[EW] |
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*/ |
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static inline DiagDirection AxisToDiagDir(Axis a) |
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{ |
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return (DiagDirection)(2 - a); |
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} |
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/** |
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* Convert an axis and a flag for north/south into a DiagDirection |
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* @param ns north -> 0, south -> 1 |
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*/ |
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static inline DiagDirection XYNSToDiagDir(Axis xy, uint ns) |
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{ |
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return (DiagDirection)(xy * 3 ^ ns * 2); |
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} |
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static inline bool IsValidDiagDirection(DiagDirection d) |
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{ |
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return d < DIAGDIR_END; |
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} |
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static inline bool IsValidDirection(Direction d) |
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{ |
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return d < DIR_END; |
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} |
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|
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static inline bool IsValidAxis(Axis d) |
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{ |
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return d < AXIS_END; |
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} |
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#endif |