diff options
Diffstat (limited to 'elrail.c')
| -rw-r--r-- | elrail.c | 132 |
1 files changed, 66 insertions, 66 deletions
@@ -1,49 +1,49 @@ /* $Id$ */ /** @file elrail.c - This file deals with displaying wires and pylons for electric railways. -<h2>Basics</h2> - -<h3>Tile Types</h3> - -We have two different types of tiles in the drawing code: -Normal Railway Tiles (NRTs) which can have more than one track on it, and -Special Railways tiles (SRTs) which have only one track (like crossings, depots -stations, etc). - -<h3>Location Categories</h3> - -All tiles are categorized into three location groups (TLG): -Group 0: Tiles with both an even X coordinate and an even Y coordinate -Group 1: Tiles with an even X and an odd Y coordinate -Group 2: Tiles with an odd X and an even Y coordinate -Group 3: Tiles with both an odd X and Y coordnate. - -<h3>Pylon Points</h3> -<h4>Control Points</h4> -A Pylon Control Point (PCP) is a position where a wire (or rather two) -is mounted onto a pylon. -Each NRT does contain 4 PCPs which are bitmapped to a byte -variable and are represented by the DiagDirection enum - -Each track ends on two PCPs and thus requires one pylon on each end. However, -there is one exception: Straight-and-level tracks only have one pylon every -other tile. - -Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs -are merged using an OR operation (i. e. if one tile needs a PCP at the postion -in question, both tiles get it). - -<h4>Position Points</h4> -A Pylon Position Point (PPP) is a position where a pylon is located on the -ground. Each PCP owns 8 in (45 degree steps) PPPs that are located around -it. PPPs are represented using the Direction enum. Each track bit has PPPs -that are impossible (because the pylon would be situated on the track) and -some that are preferred (because the pylon would be rectangular to the track). - -<img src="../../elrail_tile.png"> -<img src="../../elrail_track.png"> - - */ + * This file deals with displaying wires and pylons for electric railways. + * <h2>Basics</h2> + * + * <h3>Tile Types</h3> + * + * We have two different types of tiles in the drawing code: + * Normal Railway Tiles (NRTs) which can have more than one track on it, and + * Special Railways tiles (SRTs) which have only one track (like crossings, depots + * stations, etc). + * + * <h3>Location Categories</h3> + * + * All tiles are categorized into three location groups (TLG): + * Group 0: Tiles with both an even X coordinate and an even Y coordinate + * Group 1: Tiles with an even X and an odd Y coordinate + * Group 2: Tiles with an odd X and an even Y coordinate + * Group 3: Tiles with both an odd X and Y coordnate. + * + * <h3>Pylon Points</h3> + * <h4>Control Points</h4> + * A Pylon Control Point (PCP) is a position where a wire (or rather two) + * is mounted onto a pylon. + * Each NRT does contain 4 PCPs which are bitmapped to a byte + * variable and are represented by the DiagDirection enum + * + * Each track ends on two PCPs and thus requires one pylon on each end. However, + * there is one exception: Straight-and-level tracks only have one pylon every + * other tile. + * + * Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs + * are merged using an OR operation (i. e. if one tile needs a PCP at the postion + * in question, both tiles get it). + * + * <h4>Position Points</h4> + * A Pylon Position Point (PPP) is a position where a pylon is located on the + * ground. Each PCP owns 8 in (45 degree steps) PPPs that are located around + * it. PPPs are represented using the Direction enum. Each track bit has PPPs + * that are impossible (because the pylon would be situated on the track) and + * some that are preferred (because the pylon would be rectangular to the track). + * + * <img src="../../elrail_tile.png"> + * <img src="../../elrail_track.png"> + * + */ #include "stdafx.h" #include "openttd.h" @@ -68,8 +68,8 @@ static inline TLG GetTLG(TileIndex t) } /** Finds which Rail Bits are present on a given tile. For bridge tiles, - * returns track bits under the bridge - */ + * returns track bits under the bridge + */ static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override) { switch (GetTileType(t)) { @@ -123,9 +123,9 @@ static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override) } /** Corrects the tileh for certain tile types. Returns an effective tileh for the track on the tile. - * @param tile The tile to analyse - * @param *tileh the tileh - */ + * @param tile The tile to analyse + * @param *tileh the tileh + */ static void AdjustTileh(TileIndex tile, Slope *tileh) { if (IsTileType(tile, MP_TUNNELBRIDGE)) { @@ -150,13 +150,13 @@ static void AdjustTileh(TileIndex tile, Slope *tileh) } /** Draws wires and, if required, pylons on a given tile - * @param ti The Tileinfo to draw the tile for - */ + * @param ti The Tileinfo to draw the tile for + */ static void DrawCatenaryRailway(const TileInfo *ti) { /* Pylons are placed on a tile edge, so we need to take into account - the track configuration of 2 adjacent tiles. trackconfig[0] stores the - current tile (home tile) while [1] holds the neighbour */ + * the track configuration of 2 adjacent tiles. trackconfig[0] stores the + * current tile (home tile) while [1] holds the neighbour */ TrackBits trackconfig[TS_END]; bool isflat[TS_END]; /* Note that ti->tileh has already been adjusted for Foundations */ @@ -171,11 +171,11 @@ static void DrawCatenaryRailway(const TileInfo *ti) Track t; /* Find which rail bits are present, and select the override points. - We don't draw a pylon: - 1) INSIDE a tunnel (we wouldn't see it anyway) - 2) on the "far" end of a bridge head (the one that connects to bridge middle), - because that one is drawn on the bridge. Exception is for length 0 bridges - which have no middle tiles */ + * We don't draw a pylon: + * 1) INSIDE a tunnel (we wouldn't see it anyway) + * 2) on the "far" end of a bridge head (the one that connects to bridge middle), + * because that one is drawn on the bridge. Exception is for length 0 bridges + * which have no middle tiles */ trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP); /* If a track bit is present that is not in the main direction, the track is level */ isflat[TS_HOME] = trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT); @@ -188,7 +188,7 @@ static void DrawCatenaryRailway(const TileInfo *ti) int k; /* Here's one of the main headaches. GetTileSlope does not correct for possibly - existing foundataions, so we do have to do that manually later on.*/ + * existing foundataions, so we do have to do that manually later on.*/ tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL); trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL); if (IsTunnelTile(neighbour) && i != GetTunnelDirection(neighbour)) trackconfig[TS_NEIGHBOUR] = 0; @@ -198,7 +198,7 @@ static void DrawCatenaryRailway(const TileInfo *ti) PPPallowed[i] = AllowedPPPonPCP[i]; /* We cycle through all the existing tracks at a PCP and see what - PPPs we want to have, or may not have at all */ + * PPPs we want to have, or may not have at all */ for (k = 0; k < NUM_TRACKS_AT_PCP; k++) { /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */ if (TrackSourceTile[i][k] == TS_NEIGHBOUR && @@ -208,10 +208,10 @@ static void DrawCatenaryRailway(const TileInfo *ti) } /* We check whether the track in question (k) is present in the tile - (TrackSourceTile) */ + * (TrackSourceTile) */ if (HASBIT(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) { /* track found, if track is in the neighbour tile, adjust the number - of the PCP for preferred/allowed determination*/ + * of the PCP for preferred/allowed determination*/ DiagDirection PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i); SETBIT(PCPstatus, i); /* This PCP is in use */ @@ -244,7 +244,7 @@ static void DrawCatenaryRailway(const TileInfo *ti) AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]); /* If we have a straight (and level) track, we want a pylon only every 2 tiles - Delete the PCP if this is the case. */ + * Delete the PCP if this is the case. */ /* Level means that the slope is the same, or the track is flat */ if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) { for (k = 0; k < NUM_IGNORE_GROUPS; k++) @@ -252,9 +252,9 @@ static void DrawCatenaryRailway(const TileInfo *ti) } /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist. - In that case, we try the any of the allowed ones. if they don't exist either, don't draw - anything. Note that the preferred PPPs still contain the end-of-line markers. - Remove those (simply by ANDing with allowed, since these markers are never allowed) */ + * In that case, we try the any of the allowed ones. if they don't exist either, don't draw + * anything. Note that the preferred PPPs still contain the end-of-line markers. + * Remove those (simply by ANDing with allowed, since these markers are never allowed) */ if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i]; if (PPPallowed[i] != 0 && HASBIT(PCPstatus, i) && !HASBIT(OverridePCP, i)) { |