elrail.cpp

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00001 /* $Id: elrail.cpp 19056 2010-02-07 22:22:54Z peter1138 $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00056 #include "stdafx.h"
00057 #include "station_map.h"
00058 #include "viewport_func.h"
00059 #include "landscape.h"
00060 #include "train.h"
00061 #include "rail_gui.h"
00062 #include "tunnelbridge_map.h"
00063 #include "tunnelbridge.h"
00064 #include "elrail_func.h"
00065 #include "engine_base.h"
00066 #include "company_base.h"
00067 #include "rail.h"
00068 #include "newgrf_railtype.h"
00069 
00070 #include "table/sprites.h"
00071 #include "table/elrail_data.h"
00072 
00073 static inline TLG GetTLG(TileIndex t)
00074 {
00075   return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
00076 }
00077 
00084 static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
00085 {
00086   switch (GetTileType(t)) {
00087     case MP_RAILWAY:
00088       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00089       switch (GetRailTileType(t)) {
00090         case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
00091           return GetTrackBits(t);
00092         default:
00093           return TRACK_BIT_NONE;
00094       }
00095       break;
00096 
00097     case MP_TUNNELBRIDGE:
00098       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00099       if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
00100         *override = 1 << GetTunnelBridgeDirection(t);
00101       }
00102       return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
00103 
00104     case MP_ROAD:
00105       if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
00106       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00107       return GetCrossingRailBits(t);
00108 
00109     case MP_STATION:
00110       if (!HasStationRail(t)) return TRACK_BIT_NONE;
00111       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00112       if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;
00113       return TrackToTrackBits(GetRailStationTrack(t));
00114 
00115     default:
00116       return TRACK_BIT_NONE;
00117   }
00118 }
00119 
00123 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
00124 {
00125   if (!IsPlainRailTile(t)) return tracks;
00126 
00127   TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
00128   for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
00129     /* If the neighbor tile is either not electrified or has no tracks that can be reached
00130      * from this tile, mark all trackdirs that can be reached from the neighbour tile
00131      * as needing no catenary. */
00132     RailType rt = GetTileRailType(TileAddByDiagDir(t, d));
00133     if (rt == INVALID_RAILTYPE || !HasCatenary(rt) || (TrackStatusToTrackBits(GetTileTrackStatus(TileAddByDiagDir(t, d), TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE) {
00134       neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
00135     }
00136   }
00137 
00138   /* If the tracks from either a diagonal crossing or don't overlap, both
00139    * trackdirs have to be marked to mask the corresponding track bit. Else
00140    * one marked trackdir is enough the mask the track bit. */
00141   TrackBits mask;
00142   if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
00143     /* If the tracks form either a diagonal crossing or don't overlap, both
00144      * trackdirs have to be marked to mask the corresponding track bit. */
00145     mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00146     /* If that results in no masked tracks and it is not a diagonal crossing,
00147      * require only one marked trackdir to mask. */
00148     if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00149   } else {
00150     /* Require only one marked trackdir to mask the track. */
00151     mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00152     /* If that results in an empty set, require both trackdirs for diagonal track. */
00153     if ((tracks & mask) == TRACK_BIT_NONE) {
00154       if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
00155       if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
00156       /* If that still is not enough, require both trackdirs for any track. */
00157       if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00158     }
00159   }
00160 
00161   /* Mask the tracks only if at least one track bit would remain. */
00162   return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
00163 }
00164 
00168 static inline SpriteID GetWireBase(TileIndex tile)
00169 {
00170   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
00171   SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES);
00172   return wires == 0 ? SPR_WIRE_BASE : wires;
00173 }
00174 
00178 static inline SpriteID GetPylonBase(TileIndex tile)
00179 {
00180   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
00181   SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS);
00182   return pylons == 0 ? SPR_PYLON_BASE : pylons;
00183 }
00184 
00189 static void AdjustTileh(TileIndex tile, Slope *tileh)
00190 {
00191   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00192     if (IsTunnel(tile)) {
00193       *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
00194     } else if (*tileh != SLOPE_FLAT) {
00195       *tileh = SLOPE_FLAT;
00196     } else {
00197       *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
00198     }
00199   }
00200 }
00201 
00209 static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
00210 {
00211   /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
00212    * PCPs are always on a tile edge.
00213    *
00214    * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
00215    * So we have to move it inside the tile, because if the neighboured tile has a foundation,
00216    * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopeZ().
00217    *
00218    * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
00219    * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
00220    * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
00221    *
00222    * Also note that the result of GetSlopeZ() is very special on bridge-ramps.
00223    */
00224 
00225   byte z = GetSlopeZ(TileX(tile) * TILE_SIZE + min(x_pcp_offsets[PCPpos], TILE_SIZE - 1), TileY(tile) * TILE_SIZE + min(y_pcp_offsets[PCPpos], TILE_SIZE - 1));
00226   return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
00227 }
00228 
00236 void DrawCatenaryOnTunnel(const TileInfo *ti)
00237 {
00238   /* xmin, ymin, xmax + 1, ymax + 1 of BB */
00239   static const int _tunnel_wire_BB[4][4] = {
00240     { 0, 1, 16, 15 }, // NE
00241     { 1, 0, 15, 16 }, // SE
00242     { 0, 1, 16, 15 }, // SW
00243     { 1, 0, 15, 16 }, // NW
00244   };
00245 
00246   DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
00247 
00248   SpriteID wire_base = GetWireBase(ti->tile);
00249 
00250   const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
00251   const int *BB_data = _tunnel_wire_BB[dir];
00252   AddSortableSpriteToDraw(
00253     wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00254     BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
00255     GetTileZ(ti->tile) + sss->z_offset,
00256     IsTransparencySet(TO_CATENARY),
00257     BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
00258   );
00259 }
00260 
00264 static void DrawCatenaryRailway(const TileInfo *ti)
00265 {
00266   /* Pylons are placed on a tile edge, so we need to take into account
00267    * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
00268    * current tile (home tile) while [1] holds the neighbour */
00269   TrackBits trackconfig[TS_END];
00270   TrackBits wireconfig[TS_END];
00271   bool isflat[TS_END];
00272   /* Note that ti->tileh has already been adjusted for Foundations */
00273   Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
00274 
00275   /* Half tile slopes coincide only with horizontal/vertical track.
00276    * Faking a flat slope results in the correct sprites on positions. */
00277   if (IsHalftileSlope(tileh[TS_HOME])) tileh[TS_HOME] = SLOPE_FLAT;
00278 
00279   TLG tlg = GetTLG(ti->tile);
00280   byte PCPstatus = 0;
00281   byte OverridePCP = 0;
00282   byte PPPpreferred[DIAGDIR_END];
00283   byte PPPallowed[DIAGDIR_END];
00284 
00285   /* Find which rail bits are present, and select the override points.
00286    * We don't draw a pylon:
00287    * 1) INSIDE a tunnel (we wouldn't see it anyway)
00288    * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
00289    *    because that one is drawn on the bridge. Exception is for length 0 bridges
00290    *    which have no middle tiles */
00291   trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
00292   wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
00293   /* If a track bit is present that is not in the main direction, the track is level */
00294   isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00295 
00296   AdjustTileh(ti->tile, &tileh[TS_HOME]);
00297 
00298   SpriteID pylon_base = GetPylonBase(ti->tile);
00299 
00300   for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
00301     TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
00302     Foundation foundation = FOUNDATION_NONE;
00303     byte elevation = GetPCPElevation(ti->tile, i);
00304 
00305     /* Here's one of the main headaches. GetTileSlope does not correct for possibly
00306      * existing foundataions, so we do have to do that manually later on.*/
00307     tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL);
00308     trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
00309     wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
00310     if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00311 
00312     /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
00313      * we have to draw all pillars on the current tile. */
00314     if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00315 
00316     isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00317 
00318     PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
00319     PPPallowed[i] = AllowedPPPonPCP[i];
00320 
00321     /* We cycle through all the existing tracks at a PCP and see what
00322      * PPPs we want to have, or may not have at all */
00323     for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
00324       /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
00325       if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
00326           IsBridgeTile(neighbour) &&
00327           GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
00328         continue;
00329       }
00330 
00331       /* We check whether the track in question (k) is present in the tile
00332        * (TrackSourceTile) */
00333       DiagDirection PCPpos = i;
00334       if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00335         /* track found, if track is in the neighbour tile, adjust the number
00336          * of the PCP for preferred/allowed determination*/
00337         PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
00338         SetBit(PCPstatus, i); // This PCP is in use
00339         PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00340       }
00341 
00342       if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00343         PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00344       }
00345     }
00346 
00347     /* Deactivate all PPPs if PCP is not used */
00348     if (!HasBit(PCPstatus, i)) {
00349       PPPpreferred[i] = 0;
00350       PPPallowed[i] = 0;
00351     }
00352 
00353     /* A station is always "flat", so adjust the tileh accordingly */
00354     if (IsTileType(neighbour, MP_STATION)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00355 
00356     /* Read the foundataions if they are present, and adjust the tileh */
00357     if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
00358     if (IsBridgeTile(neighbour)) {
00359       foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
00360     }
00361 
00362     ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
00363 
00364     /* Half tile slopes coincide only with horizontal/vertical track.
00365      * Faking a flat slope results in the correct sprites on positions. */
00366     if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00367 
00368     AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
00369 
00370     /* If we have a straight (and level) track, we want a pylon only every 2 tiles
00371      * Delete the PCP if this is the case.
00372      * Level means that the slope is the same, or the track is flat */
00373     if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
00374       for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
00375         if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
00376       }
00377     }
00378 
00379     /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
00380      * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
00381      * anything. Note that the preferred PPPs still contain the end-of-line markers.
00382      * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
00383     if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
00384 
00385     if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {
00386       Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
00387       uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00388 
00389       if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&
00390           (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
00391         SetBit(OverridePCP, i);
00392       }
00393     }
00394 
00395     if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i)) {
00396       for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
00397         byte temp = PPPorder[i][GetTLG(ti->tile)][k];
00398 
00399         if (HasBit(PPPallowed[i], temp)) {
00400           uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
00401           uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
00402 
00403           /* Don't build the pylon if it would be outside the tile */
00404           if (!HasBit(OwnedPPPonPCP[i], temp)) {
00405             /* We have a neighour that will draw it, bail out */
00406             if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
00407             continue; // No neighbour, go looking for a better position
00408           }
00409 
00410           AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
00411             elevation, IsTransparencySet(TO_CATENARY), -1, -1);
00412 
00413           break; // We already have drawn a pylon, bail out
00414         }
00415       }
00416     }
00417   }
00418 
00419   /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
00420   if (IsTunnelTile(ti->tile)) return;
00421 
00422   /* Don't draw a wire under a low bridge */
00423   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
00424     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00425 
00426     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
00427   }
00428 
00429   SpriteID wire_base = GetWireBase(ti->tile);
00430 
00431   /* Drawing of pylons is finished, now draw the wires */
00432   for (Track t = TRACK_BEGIN; t < TRACK_END; t++) {
00433     if (HasBit(wireconfig[TS_HOME], t)) {
00434       byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
00435         (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
00436 
00437       const SortableSpriteStruct *sss;
00438       int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
00439 
00440       assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
00441       assert(!IsSteepSlope(tileh[TS_HOME]));
00442       sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
00443 
00444       /*
00445        * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
00446        * Therefore it is safe to use GetSlopeZ() for the elevation.
00447        * Also note, that the result of GetSlopeZ() is very special for bridge-ramps.
00448        */
00449       AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00450         sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
00451         IsTransparencySet(TO_CATENARY));
00452     }
00453   }
00454 }
00455 
00456 void DrawCatenaryOnBridge(const TileInfo *ti)
00457 {
00458   TileIndex end = GetSouthernBridgeEnd(ti->tile);
00459   TileIndex start = GetOtherBridgeEnd(end);
00460 
00461   uint length = GetTunnelBridgeLength(start, end);
00462   uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
00463   uint height;
00464 
00465   const SortableSpriteStruct *sss;
00466   Axis axis = GetBridgeAxis(ti->tile);
00467   TLG tlg = GetTLG(ti->tile);
00468 
00469   CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
00470 
00471   if ((length % 2) && num == length) {
00472     /* Draw the "short" wire on the southern end of the bridge
00473      * only needed if the length of the bridge is odd */
00474     sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
00475   } else {
00476     /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
00477     sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
00478   }
00479 
00480   height = GetBridgeHeight(end);
00481 
00482   SpriteID wire_base = GetWireBase(start);
00483 
00484   AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00485     sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
00486     IsTransparencySet(TO_CATENARY)
00487   );
00488 
00489   SpriteID pylon_base = GetPylonBase(start);
00490 
00491   /* Finished with wires, draw pylons
00492    * every other tile needs a pylon on the northern end */
00493   if (num % 2) {
00494     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
00495     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
00496     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
00497     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
00498     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
00499     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
00500   }
00501 
00502   /* need a pylon on the southern end of the bridge */
00503   if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
00504     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
00505     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
00506     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
00507     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
00508     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
00509     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
00510   }
00511 }
00512 
00513 void DrawCatenary(const TileInfo *ti)
00514 {
00515   switch (GetTileType(ti->tile)) {
00516     case MP_RAILWAY:
00517       if (IsRailDepot(ti->tile)) {
00518         const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
00519 
00520         SpriteID wire_base = GetWireBase(ti->tile);
00521 
00522         /* This wire is not visible with the default depot sprites */
00523         AddSortableSpriteToDraw(
00524           wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00525           sss->x_size, sss->y_size, sss->z_size,
00526           GetTileMaxZ(ti->tile) + sss->z_offset,
00527           IsTransparencySet(TO_CATENARY)
00528         );
00529         return;
00530       }
00531       break;
00532 
00533     case MP_TUNNELBRIDGE:
00534     case MP_ROAD:
00535     case MP_STATION:
00536       break;
00537 
00538     default: return;
00539   }
00540   DrawCatenaryRailway(ti);
00541 }
00542 
00543 bool SettingsDisableElrail(int32 p1)
00544 {
00545   Company *c;
00546   Train *t;
00547   bool disable = (p1 != 0);
00548 
00549   /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
00550   const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
00551   const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
00552 
00553   /* walk through all train engines */
00554   Engine *e;
00555   FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
00556     RailVehicleInfo *rv_info = &e->u.rail;
00557     /* if it is an electric rail engine and its railtype is the wrong one */
00558     if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
00559       /* change it to the proper one */
00560       rv_info->railtype = new_railtype;
00561     }
00562   }
00563 
00564   /* when disabling elrails, make sure that all existing trains can run on
00565    *  normal rail too */
00566   if (disable) {
00567     FOR_ALL_TRAINS(t) {
00568       if (t->railtype == RAILTYPE_ELECTRIC) {
00569         /* this railroad vehicle is now compatible only with elrail,
00570          *  so add there also normal rail compatibility */
00571         t->compatible_railtypes |= RAILTYPES_RAIL;
00572         t->railtype = RAILTYPE_RAIL;
00573         SetBit(t->flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
00574       }
00575     }
00576   }
00577 
00578   /* Fix the total power and acceleration for trains */
00579   FOR_ALL_TRAINS(t) {
00580     /* power and acceleration is cached only for front engines */
00581     if (t->IsFrontEngine()) {
00582       t->PowerChanged();
00583       t->UpdateAcceleration();
00584     }
00585   }
00586 
00587   FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
00588 
00589   /* This resets the _last_built_railtype, which will be invalid for electric
00590    * rails. It may have unintended consequences if that function is ever
00591    * extended, though. */
00592   ReinitGuiAfterToggleElrail(disable);
00593   return true;
00594 }

Generated on Wed Mar 3 23:32:21 2010 for OpenTTD by  doxygen 1.6.1