waypoint_cmd.cpp

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/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */
 
#include "stdafx.h"
 
#include "command_func.h"
#include "landscape.h"
#include "bridge_map.h"
#include "town.h"
#include "waypoint_base.h"
#include "pathfinder/yapf/yapf_cache.h"
#include "strings_func.h"
#include "viewport_func.h"
#include "viewport_kdtree.h"
#include "window_func.h"
#include "date_func.h"
#include "vehicle_func.h"
#include "string_func.h"
#include "company_func.h"
#include "newgrf_station.h"
#include "company_base.h"
#include "water.h"
#include "company_gui.h"
#include "waypoint_cmd.h"
#include "landscape_cmd.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
void Waypoint::UpdateVirtCoord()
{
  Point pt = RemapCoords2(TileX(this->xy) * TILE_SIZE, TileY(this->xy) * TILE_SIZE);
  if (this->sign.kdtree_valid) _viewport_sign_kdtree.Remove(ViewportSignKdtreeItem::MakeWaypoint(this->index));
 
  SetDParam(0, this->index);
  this->sign.UpdatePosition(pt.x, pt.y - 32 * ZOOM_LVL_BASE, STR_VIEWPORT_WAYPOINT);
 
  _viewport_sign_kdtree.Insert(ViewportSignKdtreeItem::MakeWaypoint(this->index));
 
  /* Recenter viewport */
  InvalidateWindowData(WC_WAYPOINT_VIEW, this->index);
}
 
void Waypoint::MoveSign(TileIndex new_xy)
{
  if (this->xy == new_xy) return;
 
  this->BaseStation::MoveSign(new_xy);
}
 
static Waypoint *FindDeletedWaypointCloseTo(TileIndex tile, StringID str, CompanyID cid)
{
  Waypoint *best = nullptr;
  uint thres = 8;
 
  for (Waypoint *wp : Waypoint::Iterate()) {
    if (!wp->IsInUse() && wp->string_id == str && wp->owner == cid) {
      uint cur_dist = DistanceManhattan(tile, wp->xy);
 
      if (cur_dist < thres) {
        thres = cur_dist;
        best = wp;
      }
    }
  }
 
  return best;
}
 
Axis GetAxisForNewWaypoint(TileIndex tile)
{
  /* The axis for rail waypoints is easy. */
  if (IsRailWaypointTile(tile)) return GetRailStationAxis(tile);
 
  /* Non-plain rail type, no valid axis for waypoints. */
  if (!IsTileType(tile, MP_RAILWAY) || GetRailTileType(tile) != RAIL_TILE_NORMAL) return INVALID_AXIS;
 
  switch (GetTrackBits(tile)) {
    case TRACK_BIT_X: return AXIS_X;
    case TRACK_BIT_Y: return AXIS_Y;
    default:          return INVALID_AXIS;
  }
}
 
extern CommandCost ClearTile_Station(TileIndex tile, DoCommandFlag flags);
 
static CommandCost IsValidTileForWaypoint(TileIndex tile, Axis axis, StationID *waypoint)
{
  /* if waypoint is set, then we have special handling to allow building on top of already existing waypoints.
   * so waypoint points to INVALID_STATION if we can build on any waypoint.
   * Or it points to a waypoint if we're only allowed to build on exactly that waypoint. */
  if (waypoint != nullptr && IsTileType(tile, MP_STATION)) {
    if (!IsRailWaypoint(tile)) {
      return ClearTile_Station(tile, DC_AUTO); // get error message
    } else {
      StationID wp = GetStationIndex(tile);
      if (*waypoint == INVALID_STATION) {
        *waypoint = wp;
      } else if (*waypoint != wp) {
        return_cmd_error(STR_ERROR_WAYPOINT_ADJOINS_MORE_THAN_ONE_EXISTING);
      }
    }
  }
 
  if (GetAxisForNewWaypoint(tile) != axis) return_cmd_error(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK);
 
  Owner owner = GetTileOwner(tile);
  CommandCost ret = CheckOwnership(owner);
  if (ret.Succeeded()) ret = EnsureNoVehicleOnGround(tile);
  if (ret.Failed()) return ret;
 
  Slope tileh = GetTileSlope(tile);
  if (tileh != SLOPE_FLAT &&
      (!_settings_game.construction.build_on_slopes || IsSteepSlope(tileh) || !(tileh & (0x3 << axis)) || !(tileh & ~(0x3 << axis)))) {
    return_cmd_error(STR_ERROR_FLAT_LAND_REQUIRED);
  }
 
  if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
 
  return CommandCost();
}
 
extern void GetStationLayout(byte *layout, uint numtracks, uint plat_len, const StationSpec *statspec);
extern CommandCost FindJoiningWaypoint(StationID existing_station, StationID station_to_join, bool adjacent, TileArea ta, Waypoint **wp);
extern CommandCost CanExpandRailStation(const BaseStation *st, TileArea &new_ta, Axis axis);
 
CommandCost CmdBuildRailWaypoint(DoCommandFlag flags, TileIndex start_tile, Axis axis, byte width, byte height, StationClassID spec_class, byte spec_index, StationID station_to_join, bool adjacent)
{
  if (!IsValidAxis(axis)) return CMD_ERROR;
  /* Check if the given station class is valid */
  if (spec_class != STAT_CLASS_WAYP) return CMD_ERROR;
  if (spec_index >= StationClass::Get(spec_class)->GetSpecCount()) return CMD_ERROR;
 
  /* The number of parts to build */
  byte count = axis == AXIS_X ? height : width;
 
  if ((axis == AXIS_X ? width : height) != 1) return CMD_ERROR;
  if (count == 0 || count > _settings_game.station.station_spread) return CMD_ERROR;
 
  bool reuse = (station_to_join != NEW_STATION);
  if (!reuse) station_to_join = INVALID_STATION;
  bool distant_join = (station_to_join != INVALID_STATION);
 
  if (distant_join && (!_settings_game.station.distant_join_stations || !Waypoint::IsValidID(station_to_join))) return CMD_ERROR;
 
  /* Make sure the area below consists of clear tiles. (OR tiles belonging to a certain rail station) */
  StationID est = INVALID_STATION;
 
  /* Check whether the tiles we're building on are valid rail or not. */
  TileIndexDiff offset = TileOffsByDiagDir(AxisToDiagDir(OtherAxis(axis)));
  for (int i = 0; i < count; i++) {
    TileIndex tile = start_tile + i * offset;
    CommandCost ret = IsValidTileForWaypoint(tile, axis, &est);
    if (ret.Failed()) return ret;
  }
 
  Waypoint *wp = nullptr;
  TileArea new_location(start_tile, width, height);
  CommandCost ret = FindJoiningWaypoint(est, station_to_join, adjacent, new_location, &wp);
  if (ret.Failed()) return ret;
 
  /* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
  TileIndex center_tile = start_tile + (count / 2) * offset;
  if (wp == nullptr && reuse) wp = FindDeletedWaypointCloseTo(center_tile, STR_SV_STNAME_WAYPOINT, _current_company);
 
  if (wp != nullptr) {
    /* Reuse an existing waypoint. */
    if (wp->owner != _current_company) return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_WAYPOINT);
 
    /* check if we want to expand an already existing waypoint? */
    if (wp->train_station.tile != INVALID_TILE) {
      CommandCost ret = CanExpandRailStation(wp, new_location, axis);
      if (ret.Failed()) return ret;
    }
 
    CommandCost ret = wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TEST);
    if (ret.Failed()) return ret;
  } else {
    /* allocate and initialize new waypoint */
    if (!Waypoint::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);
  }
 
  if (flags & DC_EXEC) {
    if (wp == nullptr) {
      wp = new Waypoint(start_tile);
    } else if (!wp->IsInUse()) {
      /* Move existing (recently deleted) waypoint to the new location */
      wp->xy = start_tile;
    }
    wp->owner = GetTileOwner(start_tile);
 
    wp->rect.BeforeAddRect(start_tile, width, height, StationRect::ADD_TRY);
 
    wp->delete_ctr = 0;
    wp->facilities |= FACIL_TRAIN;
    wp->build_date = _date;
    wp->string_id = STR_SV_STNAME_WAYPOINT;
    wp->train_station = new_location;
 
    if (wp->town == nullptr) MakeDefaultName(wp);
 
    wp->UpdateVirtCoord();
 
    const StationSpec *spec = StationClass::Get(spec_class)->GetSpec(spec_index);
    byte *layout_ptr = AllocaM(byte, count);
    if (spec == nullptr) {
      /* The layout must be 0 for the 'normal' waypoints by design. */
      memset(layout_ptr, 0, count);
    } else {
      /* But for NewGRF waypoints we like to have their style. */
      GetStationLayout(layout_ptr, count, 1, spec);
    }
    byte map_spec_index = AllocateSpecToStation(spec, wp, true);
 
    Company *c = Company::Get(wp->owner);
    for (int i = 0; i < count; i++) {
      TileIndex tile = start_tile + i * offset;
      byte old_specindex = HasStationTileRail(tile) ? GetCustomStationSpecIndex(tile) : 0;
      if (!HasStationTileRail(tile)) c->infrastructure.station++;
      bool reserved = IsTileType(tile, MP_RAILWAY) ?
          HasBit(GetRailReservationTrackBits(tile), AxisToTrack(axis)) :
          HasStationReservation(tile);
      MakeRailWaypoint(tile, wp->owner, wp->index, axis, layout_ptr[i], GetRailType(tile));
      SetCustomStationSpecIndex(tile, map_spec_index);
      SetRailStationReservation(tile, reserved);
      MarkTileDirtyByTile(tile);
 
      DeallocateSpecFromStation(wp, old_specindex);
      YapfNotifyTrackLayoutChange(tile, AxisToTrack(axis));
    }
    DirtyCompanyInfrastructureWindows(wp->owner);
  }
 
  return CommandCost(EXPENSES_CONSTRUCTION, count * _price[PR_BUILD_WAYPOINT_RAIL]);
}
 
CommandCost CmdBuildBuoy(DoCommandFlag flags, TileIndex tile)
{
  if (tile == 0 || !HasTileWaterGround(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
  if (IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
 
  if (!IsTileFlat(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
 
  /* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
  Waypoint *wp = FindDeletedWaypointCloseTo(tile, STR_SV_STNAME_BUOY, OWNER_NONE);
  if (wp == nullptr && !Waypoint::CanAllocateItem()) return_cmd_error(STR_ERROR_TOO_MANY_STATIONS_LOADING);
 
  CommandCost cost(EXPENSES_CONSTRUCTION, _price[PR_BUILD_WAYPOINT_BUOY]);
  if (!IsWaterTile(tile)) {
    CommandCost ret = Command<CMD_LANDSCAPE_CLEAR>::Do(flags | DC_AUTO, tile);
    if (ret.Failed()) return ret;
    cost.AddCost(ret);
  }
 
  if (flags & DC_EXEC) {
    if (wp == nullptr) {
      wp = new Waypoint(tile);
    } else {
      /* Move existing (recently deleted) buoy to the new location */
      wp->xy = tile;
      InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
    }
    wp->rect.BeforeAddTile(tile, StationRect::ADD_TRY);
 
    wp->string_id = STR_SV_STNAME_BUOY;
 
    wp->facilities |= FACIL_DOCK;
    wp->owner = OWNER_NONE;
 
    wp->build_date = _date;
 
    if (wp->town == nullptr) MakeDefaultName(wp);
 
    MakeBuoy(tile, wp->index, GetWaterClass(tile));
    CheckForDockingTile(tile);
    MarkTileDirtyByTile(tile);
 
    wp->UpdateVirtCoord();
    InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
  }
 
  return cost;
}
 
CommandCost RemoveBuoy(TileIndex tile, DoCommandFlag flags)
{
  /* XXX: strange stuff, allow clearing as invalid company when clearing landscape */
  if (!Company::IsValidID(_current_company) && !(flags & DC_BANKRUPT)) return_cmd_error(INVALID_STRING_ID);
 
  Waypoint *wp = Waypoint::GetByTile(tile);
 
  if (HasStationInUse(wp->index, false, _current_company)) return_cmd_error(STR_ERROR_BUOY_IS_IN_USE);
  /* remove the buoy if there is a ship on tile when company goes bankrupt... */
  if (!(flags & DC_BANKRUPT)) {
    CommandCost ret = EnsureNoVehicleOnGround(tile);
    if (ret.Failed()) return ret;
  }
 
  if (flags & DC_EXEC) {
    wp->facilities &= ~FACIL_DOCK;
 
    InvalidateWindowData(WC_WAYPOINT_VIEW, wp->index);
 
    /* We have to set the water tile's state to the same state as before the
     * buoy was placed. Otherwise one could plant a buoy on a canal edge,
     * remove it and flood the land (if the canal edge is at level 0) */
    MakeWaterKeepingClass(tile, GetTileOwner(tile));
 
    wp->rect.AfterRemoveTile(wp, tile);
 
    wp->UpdateVirtCoord();
    wp->delete_ctr = 0;
  }
 
  return CommandCost(EXPENSES_CONSTRUCTION, _price[PR_CLEAR_WAYPOINT_BUOY]);
}
 
static bool IsUniqueWaypointName(const std::string &name)
{
  for (const Waypoint *wp : Waypoint::Iterate()) {
    if (!wp->name.empty() && wp->name == name) return false;
  }
 
  return true;
}
 
CommandCost CmdRenameWaypoint(DoCommandFlag flags, StationID waypoint_id, const std::string &text)
{
  Waypoint *wp = Waypoint::GetIfValid(waypoint_id);
  if (wp == nullptr) return CMD_ERROR;
 
  if (wp->owner != OWNER_NONE) {
    CommandCost ret = CheckOwnership(wp->owner);
    if (ret.Failed()) return ret;
  }
 
  bool reset = text.empty();
 
  if (!reset) {
    if (Utf8StringLength(text) >= MAX_LENGTH_STATION_NAME_CHARS) return CMD_ERROR;
    if (!IsUniqueWaypointName(text)) return_cmd_error(STR_ERROR_NAME_MUST_BE_UNIQUE);
  }
 
  if (flags & DC_EXEC) {
    if (reset) {
      wp->name.clear();
    } else {
      wp->name = text;
    }
 
    wp->UpdateVirtCoord();
  }
  return CommandCost();
}