author | rubidium |
Tue, 25 Dec 2007 23:42:52 +0000 | |
changeset 8138 | dbfdc08fa6b9 |
parent 8113 | 31b7784db761 |
child 8236 | 8a5dd0b42e47 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file road_func.h Functions related to roads. */ |
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#ifndef ROAD_FUNC_H |
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#define ROAD_FUNC_H |
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#include "core/bitmath_func.hpp" |
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#include "road_type.h" |
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#include "direction_func.h" |
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/** |
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* Whether the given roadtype is valid. |
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* @param rt the roadtype to check for validness |
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* @return true if and only if valid |
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*/ |
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static inline bool IsValidRoadType(RoadType rt) |
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{ |
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return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM; |
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} |
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/** |
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* Are the given bits pointing to valid roadtypes? |
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* @param rts the roadtypes to check for validness |
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* @return true if and only if valid |
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*/ |
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static inline bool AreValidRoadTypes(RoadTypes rts) |
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{ |
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return HasBit(rts, ROADTYPE_ROAD) || HasBit(rts, ROADTYPE_TRAM); |
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} |
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/** |
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* Maps a RoadType to the corresponding RoadTypes value |
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* |
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* @param rt the roadtype to get the roadtypes from |
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* @return the roadtypes with the given roadtype |
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*/ |
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static inline RoadTypes RoadTypeToRoadTypes(RoadType rt) |
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{ |
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return (RoadTypes)(1 << rt); |
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} |
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/** |
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* Returns the RoadTypes which are not present in the given RoadTypes |
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* |
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* This function returns the complement of a given RoadTypes. |
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* |
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* @param r The given RoadTypes |
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* @return The complement of the given RoadTypes |
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* @note The unused value ROADTYPES_HWAY will be used, too. |
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*/ |
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static inline RoadTypes ComplementRoadTypes(RoadTypes r) |
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{ |
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return (RoadTypes)(ROADTYPES_ALL ^ r); |
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} |
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/** |
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* Calculate the complement of a RoadBits value |
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* |
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* Simply flips all bits in the RoadBits value to get the complement |
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* of the RoadBits. |
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* |
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* @param r The given RoadBits value |
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* @return the complement |
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*/ |
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static inline RoadBits ComplementRoadBits(RoadBits r) |
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{ |
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return (RoadBits)(ROAD_ALL ^ r); |
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} |
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/** |
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* Calculate the mirrored RoadBits |
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* |
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* Simply move the bits to their new position. |
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* |
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* @param r The given RoadBits value |
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* @return the mirrored |
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*/ |
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static inline RoadBits MirrorRoadBits(RoadBits r) |
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{ |
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return (RoadBits)(GB(r, 0, 2) << 2 | GB(r, 2, 2)); |
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} |
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/** |
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* Calculate rotated RoadBits |
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* |
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* Move the Roadbits clockwise til they are in their final position. |
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* |
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* @param r The given RoadBits value |
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* @param rot The given Rotation angle |
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* @return the rotated |
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*/ |
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static inline RoadBits RotateRoadBits(RoadBits r, DiagDirDiff rot) |
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{ |
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for (; rot > (DiagDirDiff)0; rot--){ |
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r = (RoadBits)(GB(r, 0, 1) << 3 | GB(r, 1, 3)); |
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} |
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return r; |
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} |
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/** |
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* Create the road-part which belongs to the given DiagDirection |
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* |
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* This function returns a RoadBits value which belongs to |
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* the given DiagDirection. |
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* |
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* @param d The DiagDirection |
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* @return The result RoadBits which the selected road-part set |
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*/ |
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static inline RoadBits DiagDirToRoadBits(DiagDirection d) |
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{ |
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return (RoadBits)(ROAD_NW << (3 ^ d)); |
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} |
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#endif /* ROAD_FUNC_H */ |