elrail.cpp

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00001 /* $Id$ */
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 
00057 #include "stdafx.h"
00058 #include "station_map.h"
00059 #include "viewport_func.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 "company_base.h"
00066 #include "newgrf_railtype.h"
00067 
00068 #include "table/elrail_data.h"
00069 
00075 static inline TLG GetTLG(TileIndex t)
00076 {
00077   return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));
00078 }
00079 
00086 static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)
00087 {
00088   switch (GetTileType(t)) {
00089     case MP_RAILWAY:
00090       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00091       switch (GetRailTileType(t)) {
00092         case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:
00093           return GetTrackBits(t);
00094         default:
00095           return TRACK_BIT_NONE;
00096       }
00097       break;
00098 
00099     case MP_TUNNELBRIDGE:
00100       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00101       if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {
00102         *override = 1 << GetTunnelBridgeDirection(t);
00103       }
00104       return DiagDirToDiagTrackBits(GetTunnelBridgeDirection(t));
00105 
00106     case MP_ROAD:
00107       if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;
00108       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00109       return GetCrossingRailBits(t);
00110 
00111     case MP_STATION:
00112       if (!HasStationRail(t)) return TRACK_BIT_NONE;
00113       if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;
00114       if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;
00115       return TrackToTrackBits(GetRailStationTrack(t));
00116 
00117     default:
00118       return TRACK_BIT_NONE;
00119   }
00120 }
00121 
00125 static TrackBits MaskWireBits(TileIndex t, TrackBits tracks)
00126 {
00127   if (!IsPlainRailTile(t)) return tracks;
00128 
00129   TrackdirBits neighbour_tdb = TRACKDIR_BIT_NONE;
00130   for (DiagDirection d = DIAGDIR_BEGIN; d < DIAGDIR_END; d++) {
00131     /* If the neighbor tile is either not electrified or has no tracks that can be reached
00132      * from this tile, mark all trackdirs that can be reached from the neighbour tile
00133      * as needing no catenary. */
00134     RailType rt = GetTileRailType(TileAddByDiagDir(t, d));
00135     if (rt == INVALID_RAILTYPE || !HasCatenary(rt) || (TrackStatusToTrackBits(GetTileTrackStatus(TileAddByDiagDir(t, d), TRANSPORT_RAIL, 0)) & DiagdirReachesTracks(d)) == TRACK_BIT_NONE) {
00136       neighbour_tdb |= DiagdirReachesTrackdirs(ReverseDiagDir(d));
00137     }
00138   }
00139 
00140   /* If the tracks from either a diagonal crossing or don't overlap, both
00141    * trackdirs have to be marked to mask the corresponding track bit. Else
00142    * one marked trackdir is enough the mask the track bit. */
00143   TrackBits mask;
00144   if (tracks == TRACK_BIT_CROSS || !TracksOverlap(tracks)) {
00145     /* If the tracks form either a diagonal crossing or don't overlap, both
00146      * trackdirs have to be marked to mask the corresponding track bit. */
00147     mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00148     /* If that results in no masked tracks and it is not a diagonal crossing,
00149      * require only one marked trackdir to mask. */
00150     if (tracks != TRACK_BIT_CROSS && (mask & TRACK_BIT_MASK) == TRACK_BIT_MASK) mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00151   } else {
00152     /* Require only one marked trackdir to mask the track. */
00153     mask = ~TrackdirBitsToTrackBits(neighbour_tdb);
00154     /* If that results in an empty set, require both trackdirs for diagonal track. */
00155     if ((tracks & mask) == TRACK_BIT_NONE) {
00156       if ((neighbour_tdb & TRACKDIR_BIT_X_NE) == 0 || (neighbour_tdb & TRACKDIR_BIT_X_SW) == 0) mask |= TRACK_BIT_X;
00157       if ((neighbour_tdb & TRACKDIR_BIT_Y_NW) == 0 || (neighbour_tdb & TRACKDIR_BIT_Y_SE) == 0) mask |= TRACK_BIT_Y;
00158       /* If that still is not enough, require both trackdirs for any track. */
00159       if ((tracks & mask) == TRACK_BIT_NONE) mask = ~(TrackBits)((neighbour_tdb & (neighbour_tdb >> 8)) & TRACK_BIT_MASK);
00160     }
00161   }
00162 
00163   /* Mask the tracks only if at least one track bit would remain. */
00164   return (tracks & mask) != TRACK_BIT_NONE ? tracks & mask : tracks;
00165 }
00166 
00170 static inline SpriteID GetWireBase(TileIndex tile, TileContext context = TCX_NORMAL)
00171 {
00172   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
00173   SpriteID wires = GetCustomRailSprite(rti, tile, RTSG_WIRES, context);
00174   return wires == 0 ? SPR_WIRE_BASE : wires;
00175 }
00176 
00180 static inline SpriteID GetPylonBase(TileIndex tile, TileContext context = TCX_NORMAL)
00181 {
00182   const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(tile));
00183   SpriteID pylons = GetCustomRailSprite(rti, tile, RTSG_PYLONS, context);
00184   return pylons == 0 ? SPR_PYLON_BASE : pylons;
00185 }
00186 
00192 static void AdjustTileh(TileIndex tile, Slope *tileh)
00193 {
00194   if (IsTileType(tile, MP_TUNNELBRIDGE)) {
00195     if (IsTunnel(tile)) {
00196       *tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon
00197     } else if (*tileh != SLOPE_FLAT) {
00198       *tileh = SLOPE_FLAT;
00199     } else {
00200       *tileh = InclinedSlope(GetTunnelBridgeDirection(tile));
00201     }
00202   }
00203 }
00204 
00212 static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)
00213 {
00214   /* The elevation of the "pylon"-sprite should be the elevation at the PCP.
00215    * PCPs are always on a tile edge.
00216    *
00217    * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.
00218    * So we have to move it inside the tile, because if the neighboured tile has a foundation,
00219    * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopeZ().
00220    *
00221    * When we move the position inside the tile, we will get a wrong elevation if we have a slope.
00222    * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).
00223    * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.
00224    *
00225    * Also note that the result of GetSlopeZ() is very special on bridge-ramps.
00226    */
00227 
00228   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));
00229   return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);
00230 }
00231 
00239 void DrawCatenaryOnTunnel(const TileInfo *ti)
00240 {
00241   /* xmin, ymin, xmax + 1, ymax + 1 of BB */
00242   static const int _tunnel_wire_BB[4][4] = {
00243     { 0, 1, 16, 15 }, // NE
00244     { 1, 0, 15, 16 }, // SE
00245     { 0, 1, 16, 15 }, // SW
00246     { 1, 0, 15, 16 }, // NW
00247   };
00248 
00249   DiagDirection dir = GetTunnelBridgeDirection(ti->tile);
00250 
00251   SpriteID wire_base = GetWireBase(ti->tile);
00252 
00253   const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];
00254   const int *BB_data = _tunnel_wire_BB[dir];
00255   AddSortableSpriteToDraw(
00256     wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00257     BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,
00258     GetTileZ(ti->tile) + sss->z_offset,
00259     IsTransparencySet(TO_CATENARY),
00260     BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset
00261   );
00262 }
00263 
00268 static void DrawCatenaryRailway(const TileInfo *ti)
00269 {
00270   /* Pylons are placed on a tile edge, so we need to take into account
00271    * the track configuration of 2 adjacent tiles. trackconfig[0] stores the
00272    * current tile (home tile) while [1] holds the neighbour */
00273   TrackBits trackconfig[TS_END];
00274   TrackBits wireconfig[TS_END];
00275   bool isflat[TS_END];
00276   /* Note that ti->tileh has already been adjusted for Foundations */
00277   Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };
00278 
00279   /* Half tile slopes coincide only with horizontal/vertical track.
00280    * Faking a flat slope results in the correct sprites on positions. */
00281   Corner halftile_corner = CORNER_INVALID;
00282   if (IsHalftileSlope(tileh[TS_HOME])) {
00283     halftile_corner = GetHalftileSlopeCorner(tileh[TS_HOME]);
00284     tileh[TS_HOME] = SLOPE_FLAT;
00285   }
00286 
00287   TLG tlg = GetTLG(ti->tile);
00288   byte PCPstatus = 0;
00289   byte OverridePCP = 0;
00290   byte PPPpreferred[DIAGDIR_END];
00291   byte PPPallowed[DIAGDIR_END];
00292 
00293   /* Find which rail bits are present, and select the override points.
00294    * We don't draw a pylon:
00295    * 1) INSIDE a tunnel (we wouldn't see it anyway)
00296    * 2) on the "far" end of a bridge head (the one that connects to bridge middle),
00297    *    because that one is drawn on the bridge. Exception is for length 0 bridges
00298    *    which have no middle tiles */
00299   trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);
00300   wireconfig[TS_HOME] = MaskWireBits(ti->tile, trackconfig[TS_HOME]);
00301   /* If a track bit is present that is not in the main direction, the track is level */
00302   isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00303 
00304   AdjustTileh(ti->tile, &tileh[TS_HOME]);
00305 
00306   SpriteID pylon_normal = GetPylonBase(ti->tile);
00307   SpriteID pylon_halftile = (halftile_corner != CORNER_INVALID) ? GetPylonBase(ti->tile, TCX_UPPER_HALFTILE) : pylon_normal;
00308 
00309   for (DiagDirection i = DIAGDIR_BEGIN; i < DIAGDIR_END; i++) {
00310     static const uint edge_corners[] = {
00311       1 << CORNER_N | 1 << CORNER_E, // DIAGDIR_NE
00312       1 << CORNER_S | 1 << CORNER_E, // DIAGDIR_SE
00313       1 << CORNER_S | 1 << CORNER_W, // DIAGDIR_SW
00314       1 << CORNER_N | 1 << CORNER_W, // DIAGDIR_NW
00315     };
00316     SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
00317     TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
00318     byte elevation = GetPCPElevation(ti->tile, i);
00319 
00320     /* Here's one of the main headaches. GetTileSlope does not correct for possibly
00321      * existing foundataions, so we do have to do that manually later on.*/
00322     tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL);
00323     trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);
00324     wireconfig[TS_NEIGHBOUR] = MaskWireBits(neighbour, trackconfig[TS_NEIGHBOUR]);
00325     if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00326 
00327     /* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),
00328      * we have to draw all pillars on the current tile. */
00329     if (elevation != GetPCPElevation(neighbour, ReverseDiagDir(i))) wireconfig[TS_NEIGHBOUR] = trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;
00330 
00331     isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);
00332 
00333     PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)
00334     PPPallowed[i] = AllowedPPPonPCP[i];
00335 
00336     /* We cycle through all the existing tracks at a PCP and see what
00337      * PPPs we want to have, or may not have at all */
00338     for (uint k = 0; k < NUM_TRACKS_AT_PCP; k++) {
00339       /* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */
00340       if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&
00341           IsBridgeTile(neighbour) &&
00342           GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {
00343         continue;
00344       }
00345 
00346       /* We check whether the track in question (k) is present in the tile
00347        * (TrackSourceTile) */
00348       DiagDirection PCPpos = i;
00349       if (HasBit(wireconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00350         /* track found, if track is in the neighbour tile, adjust the number
00351          * of the PCP for preferred/allowed determination*/
00352         PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);
00353         SetBit(PCPstatus, i); // This PCP is in use
00354         PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00355       }
00356 
00357       if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {
00358         PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];
00359       }
00360     }
00361 
00362     /* Deactivate all PPPs if PCP is not used */
00363     if (!HasBit(PCPstatus, i)) {
00364       PPPpreferred[i] = 0;
00365       PPPallowed[i] = 0;
00366     }
00367 
00368     Foundation foundation = FOUNDATION_NONE;
00369 
00370     /* Station and road crossings are always "flat", so adjust the tileh accordingly */
00371     if (IsTileType(neighbour, MP_STATION) || IsTileType(neighbour, MP_ROAD)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00372 
00373     /* Read the foundataions if they are present, and adjust the tileh */
00374     if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);
00375     if (IsBridgeTile(neighbour)) {
00376       foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));
00377     }
00378 
00379     ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);
00380 
00381     /* Half tile slopes coincide only with horizontal/vertical track.
00382      * Faking a flat slope results in the correct sprites on positions. */
00383     if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;
00384 
00385     AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);
00386 
00387     /* If we have a straight (and level) track, we want a pylon only every 2 tiles
00388      * Delete the PCP if this is the case.
00389      * Level means that the slope is the same, or the track is flat */
00390     if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {
00391       for (uint k = 0; k < NUM_IGNORE_GROUPS; k++) {
00392         if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);
00393       }
00394     }
00395 
00396     /* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.
00397      * In that case, we try the any of the allowed ones. if they don't exist either, don't draw
00398      * anything. Note that the preferred PPPs still contain the end-of-line markers.
00399      * Remove those (simply by ANDing with allowed, since these markers are never allowed) */
00400     if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];
00401 
00402     if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {
00403       Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
00404       uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00405 
00406       if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&
00407           (i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
00408         SetBit(OverridePCP, i);
00409       }
00410     }
00411 
00412     if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i)) {
00413       for (Direction k = DIR_BEGIN; k < DIR_END; k++) {
00414         byte temp = PPPorder[i][GetTLG(ti->tile)][k];
00415 
00416         if (HasBit(PPPallowed[i], temp)) {
00417           uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];
00418           uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];
00419 
00420           /* Don't build the pylon if it would be outside the tile */
00421           if (!HasBit(OwnedPPPonPCP[i], temp)) {
00422             /* We have a neighour that will draw it, bail out */
00423             if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE) break;
00424             continue; // No neighbour, go looking for a better position
00425           }
00426 
00427           AddSortableSpriteToDraw(pylon_base + pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,
00428             elevation, IsTransparencySet(TO_CATENARY), -1, -1);
00429 
00430           break; // We already have drawn a pylon, bail out
00431         }
00432       }
00433     }
00434   }
00435 
00436   /* The wire above the tunnel is drawn together with the tunnel-roof (see DrawCatenaryOnTunnel()) */
00437   if (IsTunnelTile(ti->tile)) return;
00438 
00439   /* Don't draw a wire under a low bridge */
00440   if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {
00441     uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
00442 
00443     if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
00444   }
00445 
00446   SpriteID wire_normal = GetWireBase(ti->tile);
00447   SpriteID wire_halftile = (halftile_corner != CORNER_INVALID) ? GetWireBase(ti->tile, TCX_UPPER_HALFTILE) : wire_normal;
00448   Track halftile_track;
00449   switch (halftile_corner) {
00450     case CORNER_W: halftile_track = TRACK_LEFT; break;
00451     case CORNER_S: halftile_track = TRACK_LOWER; break;
00452     case CORNER_E: halftile_track = TRACK_RIGHT; break;
00453     case CORNER_N: halftile_track = TRACK_UPPER; break;
00454     default:       halftile_track = INVALID_TRACK; break;
00455   }
00456 
00457   /* Drawing of pylons is finished, now draw the wires */
00458   Track t;
00459   FOR_EACH_SET_TRACK(t, wireconfig[TS_HOME]) {
00460     SpriteID wire_base = (t == halftile_track) ? wire_halftile : wire_normal;
00461     byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +
00462       (HasBit(PCPstatus, PCPpositions[t][1]) << 1);
00463 
00464     const SortableSpriteStruct *sss;
00465     int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; // tileh for the slopes, 0 otherwise
00466 
00467     assert(PCPconfig != 0); // We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that)
00468     assert(!IsSteepSlope(tileh[TS_HOME]));
00469     sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
00470 
00471     /*
00472      * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.
00473      * Therefore it is safe to use GetSlopeZ() for the elevation.
00474      * Also note that the result of GetSlopeZ() is very special for bridge-ramps.
00475      */
00476     AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00477       sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,
00478       IsTransparencySet(TO_CATENARY));
00479   }
00480 }
00481 
00489 void DrawCatenaryOnBridge(const TileInfo *ti)
00490 {
00491   TileIndex end = GetSouthernBridgeEnd(ti->tile);
00492   TileIndex start = GetOtherBridgeEnd(end);
00493 
00494   uint length = GetTunnelBridgeLength(start, end);
00495   uint num = GetTunnelBridgeLength(ti->tile, start) + 1;
00496   uint height;
00497 
00498   const SortableSpriteStruct *sss;
00499   Axis axis = GetBridgeAxis(ti->tile);
00500   TLG tlg = GetTLG(ti->tile);
00501 
00502   CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);
00503 
00504   if ((length % 2) && num == length) {
00505     /* Draw the "short" wire on the southern end of the bridge
00506      * only needed if the length of the bridge is odd */
00507     sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];
00508   } else {
00509     /* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */
00510     sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];
00511   }
00512 
00513   height = GetBridgeHeight(end);
00514 
00515   SpriteID wire_base = GetWireBase(end, TCX_ON_BRIDGE);
00516 
00517   AddSortableSpriteToDraw(wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00518     sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,
00519     IsTransparencySet(TO_CATENARY)
00520   );
00521 
00522   SpriteID pylon_base = GetPylonBase(end, TCX_ON_BRIDGE);
00523 
00524   /* Finished with wires, draw pylons
00525    * every other tile needs a pylon on the northern end */
00526   if (num % 2) {
00527     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);
00528     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
00529     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
00530     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
00531     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
00532     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
00533   }
00534 
00535   /* need a pylon on the southern end of the bridge */
00536   if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {
00537     DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);
00538     Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);
00539     if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);
00540     uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];
00541     uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];
00542     AddSortableSpriteToDraw(pylon_base + pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);
00543   }
00544 }
00545 
00551 void DrawCatenary(const TileInfo *ti)
00552 {
00553   switch (GetTileType(ti->tile)) {
00554     case MP_RAILWAY:
00555       if (IsRailDepot(ti->tile)) {
00556         const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
00557 
00558         SpriteID wire_base = GetWireBase(ti->tile);
00559 
00560         /* This wire is not visible with the default depot sprites */
00561         AddSortableSpriteToDraw(
00562           wire_base + sss->image_offset, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
00563           sss->x_size, sss->y_size, sss->z_size,
00564           GetTileMaxZ(ti->tile) + sss->z_offset,
00565           IsTransparencySet(TO_CATENARY)
00566         );
00567         return;
00568       }
00569       break;
00570 
00571     case MP_TUNNELBRIDGE:
00572     case MP_ROAD:
00573     case MP_STATION:
00574       break;
00575 
00576     default: return;
00577   }
00578   DrawCatenaryRailway(ti);
00579 }
00580 
00581 bool SettingsDisableElrail(int32 p1)
00582 {
00583   Company *c;
00584   Train *t;
00585   bool disable = (p1 != 0);
00586 
00587   /* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
00588   const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
00589   const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;
00590 
00591   /* walk through all train engines */
00592   Engine *e;
00593   FOR_ALL_ENGINES_OF_TYPE(e, VEH_TRAIN) {
00594     RailVehicleInfo *rv_info = &e->u.rail;
00595     /* if it is an electric rail engine and its railtype is the wrong one */
00596     if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {
00597       /* change it to the proper one */
00598       rv_info->railtype = new_railtype;
00599     }
00600   }
00601 
00602   /* when disabling elrails, make sure that all existing trains can run on
00603    *  normal rail too */
00604   if (disable) {
00605     FOR_ALL_TRAINS(t) {
00606       if (t->railtype == RAILTYPE_ELECTRIC) {
00607         /* this railroad vehicle is now compatible only with elrail,
00608          *  so add there also normal rail compatibility */
00609         t->compatible_railtypes |= RAILTYPES_RAIL;
00610         t->railtype = RAILTYPE_RAIL;
00611         SetBit(t->flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL);
00612       }
00613     }
00614   }
00615 
00616   /* Fix the total power and acceleration for trains */
00617   FOR_ALL_TRAINS(t) {
00618     /* power and acceleration is cached only for front engines */
00619     if (t->IsFrontEngine()) {
00620       t->ConsistChanged(true);
00621     }
00622   }
00623 
00624   FOR_ALL_COMPANIES(c) c->avail_railtypes = GetCompanyRailtypes(c->index);
00625 
00626   /* This resets the _last_built_railtype, which will be invalid for electric
00627    * rails. It may have unintended consequences if that function is ever
00628    * extended, though. */
00629   ReinitGuiAfterToggleElrail(disable);
00630   return true;
00631 }

Generated on Fri Jun 3 05:18:50 2011 for OpenTTD by  doxygen 1.6.1