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/* $Id$ */
/** @file direction.h */
#ifndef DIRECTION_H
#define DIRECTION_H
#include "helpers.hpp"
/* Direction as commonly used in v->direction, 8 way. */
enum Direction {
DIR_BEGIN = 0,
DIR_N = 0,
DIR_NE = 1, ///< Northeast, upper right on your monitor
DIR_E = 2,
DIR_SE = 3,
DIR_S = 4,
DIR_SW = 5,
DIR_W = 6,
DIR_NW = 7,
DIR_END,
INVALID_DIR = 0xFF,
};
/** Define basic enum properties */
template <> struct EnumPropsT<Direction> : MakeEnumPropsT<Direction, byte, DIR_BEGIN, DIR_END, INVALID_DIR> {};
typedef TinyEnumT<Direction> DirectionByte;
static inline Direction ReverseDir(Direction d)
{
return (Direction)(4 ^ d);
}
enum DirDiff {
DIRDIFF_SAME = 0,
DIRDIFF_45RIGHT = 1,
DIRDIFF_90RIGHT = 2,
DIRDIFF_REVERSE = 4,
DIRDIFF_90LEFT = 6,
DIRDIFF_45LEFT = 7
};
static inline DirDiff DirDifference(Direction d0, Direction d1)
{
return (DirDiff)((d0 + 8 - d1) % 8);
}
static inline DirDiff ChangeDirDiff(DirDiff d, DirDiff delta)
{
return (DirDiff)((d + delta) % 8);
}
static inline Direction ChangeDir(Direction d, DirDiff delta)
{
return (Direction)((d + delta) % 8);
}
/* Direction commonly used as the direction of entering and leaving tiles, 4-way */
enum DiagDirection {
DIAGDIR_BEGIN = 0,
DIAGDIR_NE = 0, ///< Northeast, upper right on your monitor
DIAGDIR_SE = 1,
DIAGDIR_SW = 2,
DIAGDIR_NW = 3,
DIAGDIR_END,
INVALID_DIAGDIR = 0xFF,
};
DECLARE_POSTFIX_INCREMENT(DiagDirection);
/** Define basic enum properties */
template <> struct EnumPropsT<DiagDirection> : MakeEnumPropsT<DiagDirection, byte, DIAGDIR_BEGIN, DIAGDIR_END, INVALID_DIAGDIR> {};
typedef TinyEnumT<DiagDirection> DiagDirectionByte;
static inline DiagDirection ReverseDiagDir(DiagDirection d)
{
return (DiagDirection)(2 ^ d);
}
enum DiagDirDiff {
DIAGDIRDIFF_SAME = 0,
DIAGDIRDIFF_90RIGHT = 1,
DIAGDIRDIFF_REVERSE = 2,
DIAGDIRDIFF_90LEFT = 3
};
static inline DiagDirection ChangeDiagDir(DiagDirection d, DiagDirDiff delta)
{
return (DiagDirection)((d + delta) % 4);
}
static inline DiagDirection DirToDiagDir(Direction dir)
{
return (DiagDirection)(dir >> 1);
}
static inline Direction DiagDirToDir(DiagDirection dir)
{
return (Direction)(dir * 2 + 1);
}
/* the 2 axis */
enum Axis {
AXIS_X = 0,
AXIS_Y = 1,
AXIS_END
};
static inline Axis OtherAxis(Axis a)
{
return (Axis)(a ^ 1);
}
static inline Axis DiagDirToAxis(DiagDirection d)
{
return (Axis)(d & 1);
}
/*
* Converts an Axis to a DiagDirection
* Points always in the positive direction, i.e. S[EW]
*/
static inline DiagDirection AxisToDiagDir(Axis a)
{
return (DiagDirection)(2 - a);
}
/**
* Convert an axis and a flag for north/south into a DiagDirection
* @param ns north -> 0, south -> 1
*/
static inline DiagDirection XYNSToDiagDir(Axis xy, uint ns)
{
return (DiagDirection)(xy * 3 ^ ns * 2);
}
static inline bool IsValidDiagDirection(DiagDirection d)
{
return d < DIAGDIR_END;
}
static inline bool IsValidDirection(Direction d)
{
return d < DIR_END;
}
static inline bool IsValidAxis(Axis d)
{
return d < AXIS_END;
}
#endif /* DIRECTION_H */
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