src/waypoint_cmd.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file waypoint_cmd.cpp %Command Handling for waypoints. */
  11
  12 #include "stdafx.h"
  13
  14 #include "cmd_helper.h"
  15 #include "command_func.h"
  16 #include "landscape.h"
  17 #include "bridge_map.h"
  18 #include "town.h"
  19 #include "waypoint_base.h"
  20 #include "pathfinder/yapf/yapf_cache.h"
  21 #include "strings_func.h"
  22 #include "viewport_func.h"
  23 #include "window_func.h"
  24 #include "date_func.h"
  25 #include "vehicle_func.h"
  26 #include "string_func.h"
  27 #include "company_func.h"
  28 #include "newgrf_station.h"
  29 #include "company_base.h"
  30 #include "water.h"
  31 #include "company_gui.h"
  32
  33 #include "table/strings.h"
  34
  35 #include "safeguards.h"
  36
  37 /**
  38  * Update the virtual coords needed to draw the waypoint sign.
  39  */
  40 void Waypoint::UpdateVirtCoord()
  41 {
  42         Point pt = RemapCoords2(TileX(this->xy) * TILE_SIZE, TileY(this->xy) * TILE_SIZE);
  43         SetDParam(0, this->index);
  44         this->sign.UpdatePosition(pt.x, pt.y - 32 * ZOOM_LVL_BASE, STR_VIEWPORT_WAYPOINT);
  45         /* Recenter viewport */
  46         InvalidateWindowData(WC_WAYPOINT_VIEW, this->index);
  47 }
  48
  49 /**
  50  * Find a deleted waypoint close to a tile.
  51  * @param tile to search from
  52  * @param str  the string to get the 'type' of
  53  * @param cid previous owner of the waypoint
  54  * @return the deleted nearby waypoint
  55  */
  56 static Waypoint *FindDeletedWaypointCloseTo(TileIndex tile, StringID str, CompanyID cid)
  57 {
  58         Waypoint *wp, *best = nullptr;
  59         uint thres = 8;
  60
  61         FOR_ALL_WAYPOINTS(wp) {
  62                 if (!wp->IsInUse() && wp->string_id == str && wp->owner == cid) {
  63                         uint cur_dist = DistanceManhattan(tile, wp->xy);
  64
  65                         if (cur_dist < thres) {
  66                                 thres = cur_dist;
  67                                 best = wp;
  68                         }
  69                 }
  70         }
  71
  72         return best;
  73 }
  74
  75 /**
  76  * Get the axis for a new waypoint. This means that if it is a valid
  77  * tile to build a waypoint on it returns a valid Axis, otherwise an
  78  * invalid one.
  79  * @param tile the tile to look at.
  80  * @return the axis for the to-be-build waypoint.
  81  */
  82 Axis GetAxisForNewWaypoint(TileIndex tile)
  83 {
  84         /* The axis for rail waypoints is easy. */
  85         if (IsRailWaypointTile(tile)) return GetRailStationAxis(tile);
  86
  87         /* Non-plain rail type, no valid axis for waypoints. */
  88         if (!IsTileType(tile, MP_RAILWAY) || GetRailTileType(tile) != RAIL_TILE_NORMAL) return INVALID_AXIS;
  89
  90         switch (GetTrackBits(tile)) {
  91                 case TRACK_BIT_X: return AXIS_X;
  92                 case TRACK_BIT_Y: return AXIS_Y;
  93                 default:          return INVALID_AXIS;
  94         }
  95 }
  96
  97 extern CommandCost ClearTile_Station(TileIndex tile, DoCommandFlag flags);
  98
  99 /**
 100  * Check whether the given tile is suitable for a waypoint.
 101  * @param tile the tile to check for suitability
 102  * @param axis the axis of the waypoint
 103  * @param waypoint Waypoint the waypoint to check for is already joined to. If we find another waypoint it can join to it will throw an error.
 104  */
 105 static CommandCost IsValidTileForWaypoint(TileIndex tile, Axis axis, StationID *waypoint)
 106 {
 107         /* if waypoint is set, then we have special handling to allow building on top of already existing waypoints.
 108          * so waypoint points to INVALID_STATION if we can build on any waypoint.
 109          * Or it points to a waypoint if we're only allowed to build on exactly that waypoint. */
 110         if (waypoint != nullptr && IsTileType(tile, MP_STATION)) {
 111                 if (!IsRailWaypoint(tile)) {
 112                         return ClearTile_Station(tile, DC_AUTO); // get error message
 113                 } else {
 114                         StationID wp = GetStationIndex(tile);
 115                         if (*waypoint == INVALID_STATION) {
 116                                 *waypoint = wp;
 117                         } else if (*waypoint != wp) {
 118                                 return CommandError(STR_ERROR_WAYPOINT_ADJOINS_MORE_THAN_ONE_EXISTING);
 119                         }
 120                 }
 121         }
 122
 123         if (GetAxisForNewWaypoint(tile) != axis) return CommandError(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
 124
 125         Owner owner = GetTileOwner(tile);
 126         CommandCost ret = CheckOwnership(owner);
 127         if (ret.Succeeded()) ret = EnsureNoVehicleOnGround(tile);
 128         if (ret.Failed()) return ret;
 129
 130         Slope tileh = GetTileSlope(tile);
 131         if (tileh != SLOPE_FLAT &&
 132                         (!_settings_game.construction.build_on_slopes || IsSteepSlope(tileh) || !(tileh & (0x3 << axis)) || !(tileh & ~(0x3 << axis)))) {
 133                 return CommandError(STR_ERROR_FLAT_LAND_REQUIRED);
 134         }
 135
 136         if (IsBridgeAbove(tile)) return CommandError(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
 137
 138         return CommandCost();
 139 }
 140
 141 extern void GetStationLayout(byte *layout, int numtracks, int plat_len, const StationSpec *statspec);
 142 extern CommandCost FindJoiningWaypoint(StationID existing_station, StationID station_to_join, bool adjacent, TileArea ta, Waypoint **wp);
 143 extern CommandCost CanExpandRailStation(const BaseStation *st, TileArea &new_ta, Axis axis);
 144
 145 /**
 146  * Convert existing rail to waypoint. Eg build a waypoint station over
 147  * piece of rail
 148  * @param start_tile northern most tile where waypoint will be built
 149  * @param flags type of operation
 150  * @param p1 various bitstuffed elements
 151  * - p1 = (bit  4)    - orientation (Axis)
 152  * - p1 = (bit  8-15) - width of waypoint
 153  * - p1 = (bit 16-23) - height of waypoint
 154  * - p1 = (bit 24)    - allow waypoints directly adjacent to other waypoints.
 155  * @param p2 various bitstuffed elements
 156  * - p2 = (bit  0- 7) - custom station class
 157  * - p2 = (bit  8-15) - custom station id
 158  * @param text unused
 159  * @return the cost of this operation or an error
 160  */
 161 CommandCost CmdBuildRailWaypoint(TileIndex start_tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 162 {
 163         /* Unpack parameters */
 164         Axis axis      = Extract<Axis, 4, 1>(p1);
 165         byte width     = GB(p1,  8, 8);
 166         byte height    = GB(p1, 16, 8);
 167         bool adjacent  = HasBit(p1, 24);
 168
 169         StationClassID spec_class = Extract<StationClassID, 0, 8>(p2);
 170         byte spec_index           = GB(p2, 8, 8);
 171         StationID station_to_join = GB(p2, 16, 16);
 172
 173         /* Check if the given station class is valid */
 174         if (spec_class != STAT_CLASS_WAYP) return CommandError();
 175         if (spec_index >= StationClass::Get(spec_class)->GetSpecCount()) return CommandError();
 176
 177         /* The number of parts to build */
 178         byte count = axis == AXIS_X ? height : width;
 179
 180         if ((axis == AXIS_X ? width : height) != 1) return CommandError();
 181         if (count == 0 || count > _settings_game.station.station_spread) return CommandError();
 182
 183         bool reuse = (station_to_join != NEW_STATION);
 184         if (!reuse) station_to_join = INVALID_STATION;
 185         bool distant_join = (station_to_join != INVALID_STATION);
 186
 187         if (distant_join && (!_settings_game.station.distant_join_stations || !Waypoint::IsValidID(station_to_join))) return CommandError();
 188
 189         /* Make sure the area below consists of clear tiles. (OR tiles belonging to a certain rail station) */
 190         StationID est = INVALID_STATION;
 191
 192         /* Check whether the tiles we're building on are valid rail or not. */
 193         TileIndexDiff offset = TileOffsByDiagDir(AxisToDiagDir(OtherAxis(axis)));
 194         for (int i = 0; i < count; i++) {
 195                 TileIndex tile = start_tile + i * offset;
 196                 CommandCost ret = IsValidTileForWaypoint(tile, axis, &est);
 197                 if (ret.Failed()) return ret;
 198         }
 199
 200         Waypoint *wp = nullptr;
 201         TileArea new_location(TileArea(start_tile, width, height));
 202         CommandCost ret = FindJoiningWaypoint(est, station_to_join, adjacent, new_location, &wp);
 203         if (ret.Failed()) return ret;
 204
 205         /* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
 206         TileIndex center_tile = start_tile + (count / 2) * offset;
 207         if (wp == nullptr && reuse) wp = FindDeletedWaypointCloseTo(center_tile, STR_SV_STNAME_WAYPOINT, _current_company);
 208
 209         if (wp != nullptr) {
 210                 /* Reuse an existing waypoint. */
 211                 if (wp->owner != _current_company) return CommandError(STR_ERROR_TOO_CLOSE_TO_ANOTHER_WAYPOINT);
 212
 213                 /* check if we want to expand an already existing waypoint? */
 214                 if (wp->train_station.tile != INVALID_TILE) {
 215                         CommandCost ret = CanExpandRailStation(wp, new_location, axis);
 216                         if (ret.Failed()) return ret;
 217                 }
 218
 219                 CommandCost ret = wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TEST);
 220                 if (ret.Failed()) return ret;
 221         } else {
 222                 /* allocate and initialize new waypoint */
 223                 if (!Waypoint::CanAllocateItem()) return CommandError(STR_ERROR_TOO_MANY_STATIONS_LOADING);
 224         }
 225
 226         if (flags & DC_EXEC) {
 227                 if (wp == nullptr) {
 228                         wp = new Waypoint(start_tile);
 229                 } else if (!wp->IsInUse()) {
 230                         /* Move existing (recently deleted) waypoint to the new location */
 231                         wp->xy = start_tile;
 232                 }
 233                 wp->owner = GetTileOwner(start_tile);
 234
 235                 wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TRY);
 236
 237                 wp->delete_ctr = 0;
 238                 wp->facilities |= FACIL_TRAIN;
 239                 wp->build_date = _date;
 240                 wp->string_id = STR_SV_STNAME_WAYPOINT;
 241                 wp->train_station = new_location;
 242
 243                 if (wp->town == nullptr) MakeDefaultName(wp);
 244
 245                 wp->UpdateVirtCoord();
 246
 247                 const StationSpec *spec = StationClass::Get(spec_class)->GetSpec(spec_index);
 248                 byte *layout_ptr = AllocaM(byte, count);
 249                 if (spec == nullptr) {
 250                         /* The layout must be 0 for the 'normal' waypoints by design. */
 251                         memset(layout_ptr, 0, count);
 252                 } else {
 253                         /* But for NewGRF waypoints we like to have their style. */
 254                         GetStationLayout(layout_ptr, count, 1, spec);
 255                 }
 256                 byte map_spec_index = AllocateSpecToStation(spec, wp, true);
 257
 258                 Company *c = Company::Get(wp->owner);
 259                 for (int i = 0; i < count; i++) {
 260                         TileIndex tile = start_tile + i * offset;
 261                         byte old_specindex = HasStationTileRail(tile) ? GetCustomStationSpecIndex(tile) : 0;
 262                         if (!HasStationTileRail(tile)) c->infrastructure.station++;
 263                         bool reserved = IsTileType(tile, MP_RAILWAY) ?
 264                                         HasBit(GetRailReservationTrackBits(tile), AxisToTrack(axis)) :
 265                                         HasStationReservation(tile);
 266                         MakeRailWaypoint(tile, wp->owner, wp->index, axis, layout_ptr[i], GetRailType(tile));
 267                         SetCustomStationSpecIndex(tile, map_spec_index);
 268                         SetRailStationReservation(tile, reserved);
 269                         MarkTileDirtyByTile(tile, ZOOM_LVL_DRAW_MAP);
 270
 271                         DeallocateSpecFromStation(wp, old_specindex);
 272                         YapfNotifyTrackLayoutChange(tile, AxisToTrack(axis));
 273                 }
 274                 DirtyCompanyInfrastructureWindows(wp->owner);
 275         }
 276
 277         return CommandCost(EXPENSES_CONSTRUCTION, count * _price[PR_BUILD_WAYPOINT_RAIL]);
 278 }
 279
 280 /**
 281  * Build a buoy.
 282  * @param tile tile where to place the buoy
 283  * @param flags operation to perform
 284  * @param p1 unused
 285  * @param p2 unused
 286  * @param text unused
 287  * @return the cost of this operation or an error
 288  */
 289 CommandCost CmdBuildBuoy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 290 {
 291         if (tile == 0 || !HasTileWaterGround(tile)) return CommandError(STR_ERROR_SITE_UNSUITABLE);
 292         if (IsBridgeAbove(tile)) return CommandError(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
 293
 294         if (!IsTileFlat(tile)) return CommandError(STR_ERROR_SITE_UNSUITABLE);
 295
 296         /* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
 297         Waypoint *wp = FindDeletedWaypointCloseTo(tile, STR_SV_STNAME_BUOY, OWNER_NONE);
 298         if (wp == nullptr && !Waypoint::CanAllocateItem()) return CommandError(STR_ERROR_TOO_MANY_STATIONS_LOADING);
 299
 300         CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_WAYPOINT_BUOY]);
 301         if (!IsWaterTile(tile)) {
 302                 CommandCost ret = DoCommand(tile, 0, 0, flags | DC_AUTO, CMD_LANDSCAPE_CLEAR);
 303                 if (ret.Failed()) return ret;
 304                 cost.AddCost(ret);
 305         }
 306
 307         if (flags & DC_EXEC) {
 308                 if (wp == nullptr) {
 309                         wp = new Waypoint(tile);
 310                 } else {
 311                         /* Move existing (recently deleted) buoy to the new location */
 312                         wp->xy = tile;
 313                         InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
 314                 }
 315                 wp->rect.BeforeAddTile(tile, StationRect::ADD_TRY);
 316
 317                 wp->string_id = STR_SV_STNAME_BUOY;
 318
 319                 wp->facilities |= FACIL_DOCK;
 320                 wp->owner = OWNER_NONE;
 321
 322                 wp->build_date = _date;
 323
 324                 if (wp->town == nullptr) MakeDefaultName(wp);
 325
 326                 MakeBuoy(tile, wp->index, GetWaterClass(tile));
 327                 MarkTileDirtyByTile(tile);
 328
 329                 wp->UpdateVirtCoord();
 330                 InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
 331         }
 332
 333         return cost;
 334 }
 335
 336 /**
 337  * Remove a buoy
 338  * @param tile TileIndex been queried
 339  * @param flags operation to perform
 340  * @pre IsBuoyTile(tile)
 341  * @return cost or failure of operation
 342  */
 343 CommandCost RemoveBuoy(TileIndex tile, DoCommandFlag flags)
 344 {
 345         /* XXX: strange stuff, allow clearing as invalid company when clearing landscape */
 346         if (!Company::IsValidID(_current_company) && !(flags & DC_BANKRUPT)) return CommandError(INVALID_STRING_ID);
 347
 348         Waypoint *wp = Waypoint::GetByTile(tile);
 349
 350         if (HasStationInUse(wp->index, false, _current_company)) return CommandError(STR_ERROR_BUOY_IS_IN_USE);
 351         /* remove the buoy if there is a ship on tile when company goes bankrupt... */
 352         if (!(flags & DC_BANKRUPT)) {
 353                 CommandCost ret = EnsureNoVehicleOnGround(tile);
 354                 if (ret.Failed()) return ret;
 355         }
 356
 357         if (flags & DC_EXEC) {
 358                 wp->facilities &= ~FACIL_DOCK;
 359
 360                 InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
 361
 362                 /* We have to set the water tile's state to the same state as before the
 363                  * buoy was placed. Otherwise one could plant a buoy on a canal edge,
 364                  * remove it and flood the land (if the canal edge is at level 0) */
 365                 MakeWaterKeepingClass(tile, GetTileOwner(tile));
 366
 367                 wp->rect.AfterRemoveTile(wp, tile);
 368
 369                 wp->UpdateVirtCoord();
 370                 wp->delete_ctr = 0;
 371         }
 372
 373         return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_WAYPOINT_BUOY]);
 374 }
 375
 376 /**
 377  * Check whether the name is unique amongst the waypoints.
 378  * @param name The name to check.
 379  * @return True iff the name is unique.
 380  */
 381 static bool IsUniqueWaypointName(const char *name)
 382 {
 383         const Waypoint *wp;
 384
 385         FOR_ALL_WAYPOINTS(wp) {
 386                 if (wp->name != nullptr && strcmp(wp->name, name) == 0) return false;
 387         }
 388
 389         return true;
 390 }
 391
 392 /**
 393  * Rename a waypoint.
 394  * @param tile unused
 395  * @param flags type of operation
 396  * @param p1 id of waypoint
 397  * @param p2 unused
 398  * @param text the new name or an empty string when resetting to the default
 399  * @return the cost of this operation or an error
 400  */
 401 CommandCost CmdRenameWaypoint(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 402 {
 403         Waypoint *wp = Waypoint::GetIfValid(p1);
 404         if (wp == nullptr) return CommandError();
 405
 406         if (wp->owner != OWNER_NONE) {
 407                 CommandCost ret = CheckOwnership(wp->owner);
 408                 if (ret.Failed()) return ret;
 409         }
 410
 411         bool reset = StrEmpty(text);
 412
 413         if (!reset) {
 414                 if (Utf8StringLength(text) >= MAX_LENGTH_STATION_NAME_CHARS) return CommandError();
 415                 if (!IsUniqueWaypointName(text)) return CommandError(STR_ERROR_NAME_MUST_BE_UNIQUE);
 416         }
 417
 418         if (flags & DC_EXEC) {
 419                 free(wp->name);
 420                 wp->name = reset ? nullptr : stredup(text);
 421
 422                 wp->UpdateVirtCoord();
 423         }
 424         return CommandCost();
 425 }