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Location: cpp/openttd-patchpack/source/src/direction.h
r7377:722cd70012ed
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(svn r10746) -Codechange: add a generic superclass for almost all pool items so we do not have to duplicate code for each of the pool item classes and use it for the station and roadstop classes.
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/** @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; //typedefing-enumification of Direction
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; //typedefing-enumification of DiagDirection
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 xy axis to convert
* @param ns north -> 0, south -> 1
* @return the desired DiagDirection
*/
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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