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/* $Id$ */
/** @file road.h */
#ifndef ROAD_H
#define ROAD_H
#include "helpers.hpp"
/**
* The different roadtypes we support
*
* @note currently only ROADTYPE_ROAD and ROADTYPE_TRAM are supported.
*/
enum RoadType {
ROADTYPE_ROAD = 0, ///< Basic road type
ROADTYPE_TRAM = 1, ///< Trams
ROADTYPE_HWAY = 2, ///< Only a placeholder. Not sure what we are going to do with this road type.
ROADTYPE_END, ///< Used for iterations
INVALID_ROADTYPE = 0xFF ///< flag for invalid roadtype
};
DECLARE_POSTFIX_INCREMENT(RoadType);
/**
* The different roadtypes we support, but then a bitmask of them
* @note currently only roadtypes with ROADTYPE_ROAD and ROADTYPE_TRAM are supported.
*/
enum RoadTypes {
ROADTYPES_NONE = 0, ///< No roadtypes
ROADTYPES_ROAD = 1 << ROADTYPE_ROAD, ///< Road
ROADTYPES_TRAM = 1 << ROADTYPE_TRAM, ///< Trams
ROADTYPES_HWAY = 1 << ROADTYPE_HWAY, ///< Highway (or whatever substitute)
ROADTYPES_ROADTRAM = ROADTYPES_ROAD | ROADTYPES_TRAM, ///< Road + trams
ROADTYPES_ROADHWAY = ROADTYPES_ROAD | ROADTYPES_HWAY, ///< Road + highway (or whatever substitute)
ROADTYPES_TRAMHWAY = ROADTYPES_TRAM | ROADTYPES_HWAY, ///< Trams + highway (or whatever substitute)
ROADTYPES_ALL = ROADTYPES_ROAD | ROADTYPES_TRAM | ROADTYPES_HWAY, ///< Road + trams + highway (or whatever substitute)
};
DECLARE_ENUM_AS_BIT_SET(RoadTypes);
/**
* Whether the given roadtype is valid.
* @param rt the roadtype to check for validness
* @return true if and only if valid
*/
static inline bool IsValidRoadType(RoadType rt)
{
return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
}
/**
* Are the given bits pointing to valid roadtypes?
* @param rts the roadtypes to check for validness
* @return true if and only if valid
*/
static inline bool AreValidRoadTypes(RoadTypes rts)
{
return HASBIT(rts, ROADTYPE_ROAD) || HASBIT(rts, ROADTYPE_TRAM);
}
/**
* Maps a RoadType to the corresponding RoadTypes value
*
* @param rt the roadtype to get the roadtypes from
* @return the roadtypes with the given roadtype
*/
static inline RoadTypes RoadTypeToRoadTypes(RoadType rt)
{
return (RoadTypes)(1 << rt);
}
/**
* Returns the RoadTypes which are not present in the given RoadTypes
*
* This function returns the complement of a given RoadTypes.
*
* @param r The given RoadTypes
* @return The complement of the given RoadTypes
* @note The unused value ROADTYPES_HWAY will be used, too.
*/
static inline RoadTypes ComplementRoadTypes(RoadTypes r)
{
return (RoadTypes)(ROADTYPES_ALL ^ r);
}
/**
* Enumeration for the road parts on a tile.
*
* This enumeration defines the possible road parts which
* can be build on a tile.
*/
enum RoadBits {
ROAD_NONE = 0U, ///< No road-part is build
ROAD_NW = 1U, ///< North-west part
ROAD_SW = 2U, ///< South-west part
ROAD_SE = 4U, ///< South-east part
ROAD_NE = 8U, ///< North-east part
ROAD_X = ROAD_SW | ROAD_NE, ///< Full road along the x-axis (south-west + north-east)
ROAD_Y = ROAD_NW | ROAD_SE, ///< Full road along the y-axis (north-west + south-east)
ROAD_ALL = ROAD_X | ROAD_Y ///< Full 4-way crossing
};
DECLARE_ENUM_AS_BIT_SET(RoadBits);
/**
* Calculate the complement of a RoadBits value
*
* Simply flips all bits in the RoadBits value to get the complement
* of the RoadBits.
*
* @param r The given RoadBits value
* @return the complement
*/
static inline RoadBits ComplementRoadBits(RoadBits r)
{
return (RoadBits)(ROAD_ALL ^ r);
}
/**
* Calculate the mirrored RoadBits
*
* Simply move the bits to their new position.
*
* @param r The given RoadBits value
* @return the mirrored
*/
static inline RoadBits MirrorRoadBits(RoadBits r)
{
return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2));
}
/**
* Calculate rotated RoadBits
*
* Move the Roadbits clockwise til they are in their final position.
*
* @param r The given RoadBits value
* @param rot The given Rotation angle
* @return the rotated
*/
static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot)
{
for (; rot > (DiagDirDiff)0; rot--){
r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3));
}
return r;
}
/**
* Create the road-part which belongs to the given DiagDirection
*
* This function returns a RoadBits value which belongs to
* the given DiagDirection.
*
* @param d The DiagDirection
* @return The result RoadBits which the selected road-part set
*/
static inline RoadBits DiagDirToRoadBits(DiagDirection d)
{
return (RoadBits)(ROAD_NW << (3 ^ d));
}
/**
* Return if the tile is a valid tile for a crossing.
*
* @note function is overloaded
* @param tile the curent tile
* @param ax the axis of the road over the rail
* @return true if it is a valid tile
*/
bool IsPossibleCrossing(const TileIndex tile, Axis ax);
/**
* Checks whether the trackdir means that we are reversing.
* @param dir the trackdir to check
* @return true if it is a reversing road trackdir
*/
static inline bool IsReversingRoadTrackdir(Trackdir dir)
{
return (dir & 0x07) >= 6;
}
/**
* Checks whether the given trackdir is a straight road
* @param dir the trackdir to check
* @return true if it is a straight road trackdir
*/
static inline bool IsStraightRoadTrackdir(Trackdir dir)
{
return (dir & 0x06) == 0;
}
/**
* Clean up unneccesary RoadBits of a planed tile.
* @param tile current tile
* @param org_rb planed RoadBits
* @return optimised RoadBits
*/
RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb);
/**
* Is it allowed to remove the given road bits from the given tile?
* @param tile the tile to remove the road from
* @param remove the roadbits that are going to be removed
* @param owner the actual owner of the roadbits of the tile
* @param edge_road are the removed bits from a town?
* @param rt the road type to remove the bits from
* @return true when it is allowed to remove the road bits
*/
bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, bool *edge_road, RoadType rt);
/**
* Draw the catenary for tram road bits
* @param ti information about the tile (position, slope)
* @param tram the roadbits to draw the catenary for
*/
void DrawTramCatenary(TileInfo *ti, RoadBits tram);
#endif /* ROAD_H */
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