waypoint_cmd.cpp

00001 /* $Id: waypoint_cmd.cpp 15903 2009-03-30 23:15:05Z rubidium $ */
00002 
00005 #include "stdafx.h"
00006 
00007 #include "command_func.h"
00008 #include "landscape.h"
00009 #include "economy_func.h"
00010 #include "bridge_map.h"
00011 #include "town.h"
00012 #include "waypoint.h"
00013 #include "yapf/yapf.h"
00014 #include "strings_func.h"
00015 #include "gfx_func.h"
00016 #include "functions.h"
00017 #include "window_func.h"
00018 #include "date_func.h"
00019 #include "vehicle_func.h"
00020 #include "string_func.h"
00021 #include "company_func.h"
00022 #include "newgrf_station.h"
00023 #include "viewport_func.h"
00024 #include "train.h"
00025 
00026 #include "table/strings.h"
00027 
00031 void UpdateWaypointSign(Waypoint *wp)
00032 {
00033   Point pt = RemapCoords2(TileX(wp->xy) * TILE_SIZE, TileY(wp->xy) * TILE_SIZE);
00034   SetDParam(0, wp->index);
00035   UpdateViewportSignPos(&wp->sign, pt.x, pt.y - 0x20, STR_WAYPOINT_VIEWPORT);
00036 }
00037 
00041 void RedrawWaypointSign(const Waypoint *wp)
00042 {
00043   MarkAllViewportsDirty(
00044     wp->sign.left - 6,
00045     wp->sign.top,
00046     wp->sign.left + (wp->sign.width_1 << 2) + 12,
00047     wp->sign.top + 48);
00048 }
00049 
00054 static void MakeDefaultWaypointName(Waypoint *wp)
00055 {
00056   uint32 used = 0; // bitmap of used waypoint numbers, sliding window with 'next' as base
00057   uint32 next = 0; // first waypoint number in the bitmap
00058   WaypointID idx = 0; // index where we will stop
00059 
00060   wp->town_index = ClosestTownFromTile(wp->xy, UINT_MAX)->index;
00061 
00062   /* Find first unused waypoint number belonging to this town. This can never fail,
00063    * as long as there can be at most 65535 waypoints in total.
00064    *
00065    * This does 'n * m' search, but with 32bit 'used' bitmap, it needs at most 'n * (1 + ceil(m / 32))'
00066    * steps (n - number of waypoints in pool, m - number of waypoints near this town).
00067    * Usually, it needs only 'n' steps.
00068    *
00069    * If it wasn't using 'used' and 'idx', it would just search for increasing 'next',
00070    * but this way it is faster */
00071 
00072   WaypointID cid = 0; // current index, goes to GetWaypointPoolSize()-1, then wraps to 0
00073   do {
00074     Waypoint *lwp = GetWaypoint(cid);
00075 
00076     /* check only valid waypoints... */
00077     if (lwp->IsValid() && wp != lwp) {
00078       /* only waypoints with 'generic' name within the same city */
00079       if (lwp->name == NULL && lwp->town_index == wp->town_index) {
00080         /* if lwp->town_cn < next, uint will overflow to '+inf' */
00081         uint i = (uint)lwp->town_cn - next;
00082 
00083         if (i < 32) {
00084           SetBit(used, i); // update bitmap
00085           if (i == 0) {
00086             /* shift bitmap while the lowest bit is '1';
00087              * increase the base of the bitmap too */
00088             do {
00089               used >>= 1;
00090               next++;
00091             } while (HasBit(used, 0));
00092             /* when we are at 'idx' again at end of the loop and
00093              * 'next' hasn't changed, then no waypoint had town_cn == next,
00094              * so we can safely use it */
00095             idx = cid;
00096           }
00097         }
00098       }
00099     }
00100 
00101     cid++;
00102     if (cid == GetWaypointPoolSize()) cid = 0; // wrap to zero...
00103   } while (cid != idx);
00104 
00105   wp->town_cn = (uint16)next; // set index...
00106   wp->name = NULL; // ... and use generic name
00107 }
00108 
00113 static Waypoint *FindDeletedWaypointCloseTo(TileIndex tile)
00114 {
00115   Waypoint *wp, *best = NULL;
00116   uint thres = 8;
00117 
00118   FOR_ALL_WAYPOINTS(wp) {
00119     if (wp->deleted && wp->owner == _current_company) {
00120       uint cur_dist = DistanceManhattan(tile, wp->xy);
00121 
00122       if (cur_dist < thres) {
00123         thres = cur_dist;
00124         best = wp;
00125       }
00126     }
00127   }
00128 
00129   return best;
00130 }
00131 
00142 CommandCost CmdBuildTrainWaypoint(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00143 {
00144   Waypoint *wp;
00145   Slope tileh;
00146   Axis axis;
00147 
00148   /* if custom gfx are used, make sure it is within bounds */
00149   if (p1 >= GetNumCustomStations(STAT_CLASS_WAYP)) return CMD_ERROR;
00150 
00151   if (!IsTileType(tile, MP_RAILWAY) ||
00152       GetRailTileType(tile) != RAIL_TILE_NORMAL || (
00153         (axis = AXIS_X, GetTrackBits(tile) != TRACK_BIT_X) &&
00154         (axis = AXIS_Y, GetTrackBits(tile) != TRACK_BIT_Y)
00155       )) {
00156     return_cmd_error(STR_1005_NO_SUITABLE_RAILROAD_TRACK);
00157   }
00158 
00159   Owner owner = GetTileOwner(tile);
00160   if (!CheckOwnership(owner)) return CMD_ERROR;
00161   if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
00162 
00163   tileh = GetTileSlope(tile, NULL);
00164   if (tileh != SLOPE_FLAT &&
00165       (!_settings_game.construction.build_on_slopes || IsSteepSlope(tileh) || !(tileh & (0x3 << axis)) || !(tileh & ~(0x3 << axis)))) {
00166     return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
00167   }
00168 
00169   if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
00170 
00171   /* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
00172   wp = FindDeletedWaypointCloseTo(tile);
00173   if (wp == NULL && !Waypoint::CanAllocateItem()) return CMD_ERROR;
00174 
00175   if (flags & DC_EXEC) {
00176     if (wp == NULL) {
00177       wp = new Waypoint(tile);
00178 
00179       wp->town_index = INVALID_TOWN;
00180       wp->name = NULL;
00181       wp->town_cn = 0;
00182     } else {
00183       /* Move existing (recently deleted) waypoint to the new location */
00184 
00185       /* First we update the destination for all vehicles that
00186        * have the old waypoint in their orders. */
00187       Vehicle *v;
00188       FOR_ALL_VEHICLES(v) {
00189         if (v->type == VEH_TRAIN &&
00190             v->First() == v &&
00191             v->current_order.IsType(OT_GOTO_WAYPOINT) &&
00192             v->dest_tile == wp->xy) {
00193           v->dest_tile = tile;
00194         }
00195       }
00196 
00197       RedrawWaypointSign(wp);
00198       wp->xy = tile;
00199       InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
00200     }
00201     wp->owner = owner;
00202 
00203     const StationSpec *statspec;
00204 
00205     bool reserved = HasBit(GetTrackReservation(tile), AxisToTrack(axis));
00206     MakeRailWaypoint(tile, owner, axis, GetRailType(tile), wp->index);
00207     SetDepotWaypointReservation(tile, reserved);
00208     MarkTileDirtyByTile(tile);
00209 
00210     statspec = GetCustomStationSpec(STAT_CLASS_WAYP, p1);
00211 
00212     if (statspec != NULL) {
00213       wp->stat_id = p1;
00214       wp->grfid = statspec->grffile->grfid;
00215       wp->localidx = statspec->localidx;
00216     } else {
00217       /* Specified custom graphics do not exist, so use default. */
00218       wp->stat_id = 0;
00219       wp->grfid = 0;
00220       wp->localidx = 0;
00221     }
00222 
00223     wp->deleted = 0;
00224     wp->build_date = _date;
00225 
00226     if (wp->town_index == INVALID_TOWN) MakeDefaultWaypointName(wp);
00227 
00228     UpdateWaypointSign(wp);
00229     RedrawWaypointSign(wp);
00230     YapfNotifyTrackLayoutChange(tile, AxisToTrack(axis));
00231   }
00232 
00233   return CommandCost(EXPENSES_CONSTRUCTION, _price.build_train_depot);
00234 }
00235 
00243 CommandCost RemoveTrainWaypoint(TileIndex tile, DoCommandFlag flags, bool justremove)
00244 {
00245   Waypoint *wp;
00246 
00247   /* Make sure it's a waypoint */
00248   if (!IsRailWaypointTile(tile) ||
00249       (!CheckTileOwnership(tile) && _current_company != OWNER_WATER) ||
00250       !EnsureNoVehicleOnGround(tile)) {
00251     return CMD_ERROR;
00252   }
00253 
00254   if (flags & DC_EXEC) {
00255     Track track = GetRailWaypointTrack(tile);
00256     wp = GetWaypointByTile(tile);
00257 
00258     wp->deleted = 30; // let it live for this many days before we do the actual deletion.
00259     RedrawWaypointSign(wp);
00260 
00261     Vehicle *v = NULL;
00262     if (justremove) {
00263       TrackBits tracks = GetRailWaypointBits(tile);
00264       bool reserved = GetDepotWaypointReservation(tile);
00265       MakeRailNormal(tile, wp->owner, tracks, GetRailType(tile));
00266       if (reserved) SetTrackReservation(tile, tracks);
00267       MarkTileDirtyByTile(tile);
00268     } else {
00269       if (GetDepotWaypointReservation(tile)) {
00270         v = GetTrainForReservation(tile, track);
00271         if (v != NULL) FreeTrainTrackReservation(v);
00272       }
00273       DoClearSquare(tile);
00274       AddTrackToSignalBuffer(tile, track, wp->owner);
00275     }
00276     YapfNotifyTrackLayoutChange(tile, track);
00277     if (v != NULL) TryPathReserve(v, true);
00278   }
00279 
00280   return CommandCost(EXPENSES_CONSTRUCTION, _price.remove_train_depot);
00281 }
00282 
00291 CommandCost CmdRemoveTrainWaypoint(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00292 {
00293   return RemoveTrainWaypoint(tile, flags, true);
00294 }
00295 
00296 static bool IsUniqueWaypointName(const char *name)
00297 {
00298   const Waypoint *wp;
00299 
00300   FOR_ALL_WAYPOINTS(wp) {
00301     if (wp->name != NULL && strcmp(wp->name, name) == 0) return false;
00302   }
00303 
00304   return true;
00305 }
00306 
00315 CommandCost CmdRenameWaypoint(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00316 {
00317   if (!IsValidWaypointID(p1)) return CMD_ERROR;
00318 
00319   Waypoint *wp = GetWaypoint(p1);
00320   if (!CheckOwnership(wp->owner)) return CMD_ERROR;
00321 
00322   bool reset = StrEmpty(text);
00323 
00324   if (!reset) {
00325     if (strlen(text) >= MAX_LENGTH_WAYPOINT_NAME_BYTES) return CMD_ERROR;
00326     if (!IsUniqueWaypointName(text)) return_cmd_error(STR_NAME_MUST_BE_UNIQUE);
00327   }
00328 
00329   if (flags & DC_EXEC) {
00330     free(wp->name);
00331 
00332     if (reset) {
00333       MakeDefaultWaypointName(wp); // sets wp->name = NULL
00334     } else {
00335       wp->name = strdup(text);
00336     }
00337 
00338     UpdateWaypointSign(wp);
00339     MarkWholeScreenDirty();
00340   }
00341   return CommandCost();
00342 }

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