elrail.cpp

Go to the documentation of this file.
00001 /* $Id: elrail.cpp 17347 2009-09-01 13:28:15Z rubidium $ */
00002 
00049 #include "stdafx.h"
00050 #include "openttd.h"
00051 #include "station_map.h"
00052 #include "viewport_func.h"
00053 #include "landscape.h"
00054 #include "train.h"
00055 #include "rail_gui.h"
00056 #include "tunnelbridge_map.h"
00057 #include "vehicle_func.h"
00058 #include "tunnelbridge.h"
00059 #include "elrail_func.h"
00060 #include "engine_base.h"
00061 
00062 #include "table/sprites.h"
00063 #include "table/elrail_data.h"
00064 
00065 static inline TLG GetTLG(TileIndex t)
00066 {
00067   return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
00068 }
00069 
00076 static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
00077 {
00078   switch (GetTileType(t)) {
00079     case MP_RAILWAY:
00080       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00081       switch (GetRailTileType(t)) {
00082         case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
00083           return GetTrackBits(t);
00084         case RAIL_TILE_WAYPOINT:
00085           return GetRailWaypointBits(t);
00086         default:
00087           return TRACK_BIT_NONE;
00088       }
00089       break;
00090 
00091     case MP_TUNNELBRIDGE:
00092       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00093       if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
00094         *override = 1 << GetTunnelBridgeDirection(t);
00095       }
00096       return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
00097 
00098     case MP_ROAD:
00099       if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
00100       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00101       return GetCrossingRailBits(t);
00102 
00103     case MP_STATION:
00104       if (!IsRailwayStation(t)) return TRACK_BIT_NONE;
00105       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00106       if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;
00107       return TrackToTrackBits(GetRailStationTrack(t));
00108 
00109     default:
00110       return TRACK_BIT_NONE;
00111   }
00112 }
00113 
00117 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
00118 {
00119   if (!IsPlainRailTile(t)) return tracks;
00120 
00121   TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
00122   for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
00123     /* If the neighbor tile is either not electrified or has no tracks that can be reached
00124      * from this tile, mark all trackdirs that can be reached from the neighbour tile
00125      * as needing no catenary. */
00126     RailType rt = GetTileRailType(TileAddByDiagDir(t, d));
00127     if (rt == INVALID_RAILTYPE || !HasCatenary(rt) || (TrackStatusToTrackBits(GetTileTrackStatus(TileAddByDiagDir(t, d), TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE) {
00128       neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
00129     }
00130   }
00131 
00132   /* If the tracks from either a diagonal crossing or don't overlap, both
00133    * trackdirs have to be marked to mask the corresponding track bit. Else
00134    * one marked trackdir is enough the mask the track bit. */
00135   TrackBits mask;
00136   if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
00137     /* If the tracks form either a diagonal crossing or don't overlap, both
00138      * trackdirs have to be marked to mask the corresponding track bit. */
00139     mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00140     /* If that results in no masked tracks and it is not a diagonal crossing,
00141      * require only one marked trackdir to mask. */
00142     if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00143   } else {
00144     /* Require only one marked trackdir to mask the track. */
00145     mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00146     /* If that results in an empty set, require both trackdirs for diagonal track. */
00147     if ((tracks & mask) == TRACK_BIT_NONE) {
00148       if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
00149       if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
00150       /* If that still is not enough, require both trackdirs for any track. */
00151       if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00152     }
00153   }
00154 
00155   /* Mask the tracks only if at least one track bit would remain. */
00156   return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
00157 }
00158 
00162 static inline SpriteID GetWireBase(TileIndex tile)
00163 {
00164   return SPR_WIRE_BASE;
00165 }
00166 
00170 static inline SpriteID GetPylonBase(TileIndex tile)
00171 {
00172   return SPR_PYLON_BASE;
00173 }
00174 
00179 static void AdjustTileh(TileIndex tile, Slope *tileh)
00180 {
00181   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00182     if (IsTunnel(tile)) {
00183       *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
00184     } else if (*tileh != SLOPE_FLAT) {
00185       *tileh = SLOPE_FLAT;
00186     } else {
00187       *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
00188     }
00189   }
00190 }
00191 
00199 static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
00200 {
00201   /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
00202    * PCPs are always on a tile edge.
00203    *
00204    * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
00205    * So we have to move it inside the tile, because if the neighboured tile has a foundation,
00206    * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopeZ().
00207    *
00208    * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
00209    * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
00210    * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
00211    *
00212    * Also note that the result of GetSlopeZ() is very special on bridge-ramps.
00213    */
00214 
00215   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));
00216   return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
00217 }
00218 
00226 void DrawCatenaryOnTunnel(const TileInfo *ti)
00227 {
00228   /* xmin, ymin, xmax + 1, ymax + 1 of BB */
00229   static const int _tunnel_wire_BB[4][4] = {
00230     { 0, 1, 16, 15 }, // NE
00231     { 1, 0, 15, 16 }, // SE
00232     { 0, 1, 16, 15 }, // SW
00233     { 1, 0, 15, 16 }, // NW
00234   };
00235 
00236   DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
00237 
00238   SpriteID wire_base = GetWireBase(ti->tile);
00239 
00240   const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
00241   const int *BB_data = _tunnel_wire_BB[dir];
00242   AddSortableSpriteToDraw(
00243     wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00244     BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
00245     GetTileZ(ti->tile) + sss->z_offset,
00246     IsTransparencySet(TO_CATENARY),
00247     BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
00248   );
00249 }
00250 
00254 static void DrawCatenaryRailway(const TileInfo *ti)
00255 {
00256   /* Pylons are placed on a tile edge, so we need to take into account
00257    * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
00258    * current tile (home tile) while [1] holds the neighbour */
00259   TrackBits trackconfig[TS_END];
00260   TrackBits wireconfig[TS_END];
00261   bool isflat[TS_END];
00262   /* Note that ti->tileh has already been adjusted for Foundations */
00263   Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
00264 
00265   /* Half tile slopes coincide only with horizontal/vertical track.
00266    * Faking a flat slope results in the correct sprites on positions. */
00267   if (IsHalftileSlope(tileh[TS_HOME])) tileh[TS_HOME] = SLOPE_FLAT;
00268 
00269   TLG tlg = GetTLG(ti->tile);
00270   byte PCPstatus = 0;
00271   byte OverridePCP = 0;
00272   byte PPPpreferred[DIAGDIR_END];
00273   byte PPPallowed[DIAGDIR_END];
00274 
00275   /* Find which rail bits are present, and select the override points.
00276    * We don't draw a pylon:
00277    * 1) INSIDE a tunnel (we wouldn't see it anyway)
00278    * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
00279    *    because that one is drawn on the bridge. Exception is for length 0 bridges
00280    *    which have no middle tiles */
00281   trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
00282   wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
00283   /* If a track bit is present that is not in the main direction, the track is level */
00284   isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00285 
00286   AdjustTileh(ti->tile, &tileh[TS_HOME]);
00287 
00288   SpriteID pylon_base = GetPylonBase(ti->tile);
00289 
00290   for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
00291     TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
00292     Foundation foundation = FOUNDATION_NONE;
00293     byte elevation = GetPCPElevation(ti->tile, i);
00294 
00295     /* Here's one of the main headaches. GetTileSlope does not correct for possibly
00296      * existing foundataions, so we do have to do that manually later on.*/
00297     tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL);
00298     trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
00299     wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
00300     if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00301 
00302     /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
00303      * we have to draw all pillars on the current tile. */
00304     if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00305 
00306     isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00307 
00308     PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
00309     PPPallowed[i] = AllowedPPPonPCP[i];
00310 
00311     /* We cycle through all the existing tracks at a PCP and see what
00312      * PPPs we want to have, or may not have at all */
00313     for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
00314       /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
00315       if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
00316           IsBridgeTile(neighbour) &&
00317           GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
00318         continue;
00319       }
00320 
00321       /* We check whether the track in question (k) is present in the tile
00322        * (TrackSourceTile) */
00323       DiagDirection PCPpos = i;
00324       if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00325         /* track found, if track is in the neighbour tile, adjust the number
00326          * of the PCP for preferred/allowed determination*/
00327         PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
00328         SetBit(PCPstatus, i); // This PCP is in use
00329         PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00330       }
00331 
00332       if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00333         PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00334       }
00335     }
00336 
00337     /* Deactivate all PPPs if PCP is not used */
00338     if (!HasBit(PCPstatus, i)) {
00339       PPPpreferred[i] = 0;
00340       PPPallowed[i] = 0;
00341     }
00342 
00343     /* A station is always "flat", so adjust the tileh accordingly */
00344     if (IsTileType(neighbour, MP_STATION)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00345 
00346     /* Read the foundataions if they are present, and adjust the tileh */
00347     if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
00348     if (IsBridgeTile(neighbour)) {
00349       foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
00350     }
00351 
00352     ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
00353 
00354     /* Half tile slopes coincide only with horizontal/vertical track.
00355      * Faking a flat slope results in the correct sprites on positions. */
00356     if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00357 
00358     AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
00359 
00360     /* If we have a straight (and level) track, we want a pylon only every 2 tiles
00361      * Delete the PCP if this is the case.
00362      * Level means that the slope is the same, or the track is flat */
00363     if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
00364       for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
00365         if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
00366       }
00367     }
00368 
00369     /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
00370      * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
00371      * anything. Note that the preferred PPPs still contain the end-of-line markers.
00372      * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
00373     if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
00374 
00375     if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {
00376       Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
00377       uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00378 
00379       if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&
00380           (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
00381         SetBit(OverridePCP, i);
00382       }
00383     }
00384 
00385     if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i)) {
00386       for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
00387         byte temp = PPPorder[i][GetTLG(ti->tile)][k];
00388 
00389         if (HasBit(PPPallowed[i], temp)) {
00390           uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
00391           uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
00392 
00393           /* Don't build the pylon if it would be outside the tile */
00394           if (!HasBit(OwnedPPPonPCP[i], temp)) {
00395             /* We have a neighour that will draw it, bail out */
00396             if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
00397             continue; // No neighbour, go looking for a better position
00398           }
00399 
00400           AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
00401             elevation, IsTransparencySet(TO_CATENARY), -1, -1);
00402 
00403           break; // We already have drawn a pylon, bail out
00404         }
00405       }
00406     }
00407   }
00408 
00409   /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
00410   if (IsTunnelTile(ti->tile)) return;
00411 
00412   /* Don't draw a wire under a low bridge */
00413   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
00414     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00415 
00416     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
00417   }
00418 
00419   SpriteID wire_base = GetWireBase(ti->tile);
00420 
00421   /* Drawing of pylons is finished, now draw the wires */
00422   for (Track t = TRACK_BEGIN; t < TRACK_END; t++) {
00423     if (HasBit(wireconfig[TS_HOME], t)) {
00424       byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
00425         (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
00426 
00427       const SortableSpriteStruct *sss;
00428       int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
00429 
00430       assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
00431       assert(!IsSteepSlope(tileh[TS_HOME]));
00432       sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
00433 
00434       /*
00435        * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
00436        * Therefore it is safe to use GetSlopeZ() for the elevation.
00437        * Also note, that the result of GetSlopeZ() is very special for bridge-ramps.
00438        */
00439       AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00440         sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
00441         IsTransparencySet(TO_CATENARY));
00442     }
00443   }
00444 }
00445 
00446 void DrawCatenaryOnBridge(const TileInfo *ti)
00447 {
00448   TileIndex end = GetSouthernBridgeEnd(ti->tile);
00449   TileIndex start = GetOtherBridgeEnd(end);
00450 
00451   uint length = GetTunnelBridgeLength(start, end);
00452   uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
00453   uint height;
00454 
00455   const SortableSpriteStruct *sss;
00456   Axis axis = GetBridgeAxis(ti->tile);
00457   TLG tlg = GetTLG(ti->tile);
00458 
00459   CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
00460 
00461   if ((length % 2) && num == length) {
00462     /* Draw the "short" wire on the southern end of the bridge
00463      * only needed if the length of the bridge is odd */
00464     sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
00465   } else {
00466     /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
00467     sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
00468   }
00469 
00470   height = GetBridgeHeight(end);
00471 
00472   SpriteID wire_base = GetWireBase(start);
00473 
00474   AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00475     sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
00476     IsTransparencySet(TO_CATENARY)
00477   );
00478 
00479   SpriteID pylon_base = GetPylonBase(start);
00480 
00481   /* Finished with wires, draw pylons
00482    * every other tile needs a pylon on the northern end */
00483   if (num % 2) {
00484     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
00485     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
00486     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
00487     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
00488     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
00489     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
00490   }
00491 
00492   /* need a pylon on the southern end of the bridge */
00493   if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
00494     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
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 
00503 void DrawCatenary(const TileInfo *ti)
00504 {
00505   switch (GetTileType(ti->tile)) {
00506     case MP_RAILWAY:
00507       if (IsRailDepot(ti->tile)) {
00508         const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
00509 
00510         SpriteID wire_base = GetWireBase(ti->tile);
00511 
00512         /* This wire is not visible with the default depot sprites */
00513         AddSortableSpriteToDraw(
00514           wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00515           sss->x_size, sss->y_size, sss->z_size,
00516           GetTileMaxZ(ti->tile) + sss->z_offset,
00517           IsTransparencySet(TO_CATENARY)
00518         );
00519         return;
00520       }
00521       break;
00522 
00523     case MP_TUNNELBRIDGE:
00524     case MP_ROAD:
00525     case MP_STATION:
00526       break;
00527 
00528     default: return;
00529   }
00530   DrawCatenaryRailway(ti);
00531 }
00532 
00533 bool SettingsDisableElrail(int32 p1)
00534 {
00535   Vehicle *v;
00536   Company *c;
00537   bool disable = (p1 != 0);
00538 
00539   /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
00540   const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
00541   const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
00542 
00543   /* walk through all train engines */
00544   Engine *e;
00545   FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
00546     RailVehicleInfo *rv_info = &e->u.rail;
00547     /* if it is an electric rail engine and its railtype is the wrong one */
00548     if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
00549       /* change it to the proper one */
00550       rv_info->railtype = new_railtype;
00551     }
00552   }
00553 
00554   /* when disabling elrails, make sure that all existing trains can run on
00555    *  normal rail too */
00556   if (disable) {
00557     FOR_ALL_VEHICLES(v) {
00558       if (v->type == VEH_TRAIN && v->u.rail.railtype == RAILTYPE_ELECTRIC) {
00559         /* this railroad vehicle is now compatible only with elrail,
00560          *  so add there also normal rail compatibility */
00561         v->u.rail.compatible_railtypes |= RAILTYPES_RAIL;
00562         v->u.rail.railtype = RAILTYPE_RAIL;
00563         SetBit(v->u.rail.flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
00564       }
00565     }
00566   }
00567 
00568   /* Fix the total power and acceleration for trains */
00569   FOR_ALL_VEHICLES(v) {
00570     /* power and acceleration is cached only for front engines */
00571     if (v->type == VEH_TRAIN && IsFrontEngine(v)) {
00572       TrainPowerChanged(v);
00573       UpdateTrainAcceleration(v);
00574     }
00575   }
00576 
00577   FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
00578 
00579   /* This resets the _last_built_railtype, which will be invalid for electric
00580    * rails. It may have unintended consequences if that function is ever
00581    * extended, though. */
00582   ReinitGuiAfterToggleElrail(disable);
00583   return true;
00584 }

Generated on Thu Oct 1 11:03:13 2009 for OpenTTD by  doxygen 1.5.6