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author | truelight <truelight@openttd.org> | 2007-07-23 16:30:59 +0000 |
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committer | truelight <truelight@openttd.org> | 2007-07-23 16:30:59 +0000 |
commit | 4c1912f8810936024c87f2e6077745a00ed99a91 (patch) | |
tree | bbe3689612df3f52fdcbf335e2f0c6bcb05a0a50 /src | |
parent | 2f0448ddbaa0e2527b25051c6daf5972f79e2f14 (diff) | |
download | openttd-4c1912f8810936024c87f2e6077745a00ed99a91.tar.xz |
(svn r10661) -Documentation: documented slope.h (Progman)
Diffstat (limited to 'src')
-rw-r--r-- | src/slope.h | 72 |
1 files changed, 50 insertions, 22 deletions
diff --git a/src/slope.h b/src/slope.h index 13f106ee1..f3bb3435f 100644 --- a/src/slope.h +++ b/src/slope.h @@ -1,39 +1,67 @@ /* $Id$ */ -/** @file slope.h */ +/** @file slope.h Definitions of a slope. + * This file defines the enumeration and helper functions for handling + * the slope info of a tile. + */ #ifndef SLOPE_H #define SLOPE_H +/** + * Enumeration for the slope-type. + * + * This enumeration use the chars N,E,S,W corresponding the + * direction north, east, south and west. The top corner of a tile + * is the north-part of the tile. The whole slope is encoded with + * 5 bits, 4 bits for each corner and 1 bit for a steep-flag. + */ enum Slope { - SLOPE_FLAT = 0x00, - SLOPE_W = 0x01, - SLOPE_S = 0x02, - SLOPE_E = 0x04, - SLOPE_N = 0x08, - SLOPE_STEEP = 0x10, - SLOPE_NW = SLOPE_N | SLOPE_W, - SLOPE_SW = SLOPE_S | SLOPE_W, - SLOPE_SE = SLOPE_S | SLOPE_E, - SLOPE_NE = SLOPE_N | SLOPE_E, - SLOPE_EW = SLOPE_E | SLOPE_W, - SLOPE_NS = SLOPE_N | SLOPE_S, - SLOPE_ELEVATED = SLOPE_N | SLOPE_E | SLOPE_S | SLOPE_W, - SLOPE_NWS = SLOPE_N | SLOPE_W | SLOPE_S, - SLOPE_WSE = SLOPE_W | SLOPE_S | SLOPE_E, - SLOPE_SEN = SLOPE_S | SLOPE_E | SLOPE_N, - SLOPE_ENW = SLOPE_E | SLOPE_N | SLOPE_W, - SLOPE_STEEP_W = SLOPE_STEEP | SLOPE_NWS, - SLOPE_STEEP_S = SLOPE_STEEP | SLOPE_WSE, - SLOPE_STEEP_E = SLOPE_STEEP | SLOPE_SEN, - SLOPE_STEEP_N = SLOPE_STEEP | SLOPE_ENW + SLOPE_FLAT = 0x00, ///< a flat tile + SLOPE_W = 0x01, ///< the west corner of the tile is raised + SLOPE_S = 0x02, ///< the south corner of the tile is raised + SLOPE_E = 0x04, ///< the east corner of the tile is raised + SLOPE_N = 0x08, ///< the north corner of the tile is raised + SLOPE_STEEP = 0x10, ///< indicates the slope is steep + SLOPE_NW = SLOPE_N | SLOPE_W, ///< north and west corner are raised + SLOPE_SW = SLOPE_S | SLOPE_W, ///< south and west corner are raised + SLOPE_SE = SLOPE_S | SLOPE_E, ///< south and east corner are raised + SLOPE_NE = SLOPE_N | SLOPE_E, ///< north and east corner are raised + SLOPE_EW = SLOPE_E | SLOPE_W, ///< east and west corner are raised + SLOPE_NS = SLOPE_N | SLOPE_S, ///< north and south corner are raised + SLOPE_ELEVATED = SLOPE_N | SLOPE_E | SLOPE_S | SLOPE_W, ///< all corner are raised, similar to SLOPE_FLAT + SLOPE_NWS = SLOPE_N | SLOPE_W | SLOPE_S, ///< north, west and south corner are raised + SLOPE_WSE = SLOPE_W | SLOPE_S | SLOPE_E, ///< west, south and east corner are raised + SLOPE_SEN = SLOPE_S | SLOPE_E | SLOPE_N, ///< south, east and north corner are raised + SLOPE_ENW = SLOPE_E | SLOPE_N | SLOPE_W, ///< east, north and west corner are raised + SLOPE_STEEP_W = SLOPE_STEEP | SLOPE_NWS, ///< a steep slope falling to east (from west) + SLOPE_STEEP_S = SLOPE_STEEP | SLOPE_WSE, ///< a steep slope falling to north (from south) + SLOPE_STEEP_E = SLOPE_STEEP | SLOPE_SEN, ///< a steep slope falling to west (from east) + SLOPE_STEEP_N = SLOPE_STEEP | SLOPE_ENW ///< a steep slope falling to south (from north) }; +/** + * Checks if a slope is steep. + * + * @param s The given #Slope. + * @return True if the slope is steep, else false. + */ static inline bool IsSteepSlope(Slope s) { return (s & SLOPE_STEEP) != 0; } +/** + * Return the complement of a slope. + * + * This method returns the complement of a slope. The complement of a + * slope is a slope with raised corner which aren't raised in the given + * slope. + * + * @pre The slope must not be steep. + * @param s The #Slope to get the complement. + * @return a complement Slope of the given slope. + */ static inline Slope ComplementSlope(Slope s) { assert(!IsSteepSlope(s)); |