From 3ec35e4e8d6ae37b53fa8d0c74cfe8d8de822e1b Mon Sep 17 00:00:00 2001 From: rubidium Date: Fri, 24 Jul 2009 17:05:17 +0000 Subject: (svn r16942) -Codechange: document CanExpandRailStation and remove the 'magic' array of numbers for a named struct --- src/station_cmd.cpp | 69 +++++++++++++++++++++++++---------------------------- 1 file changed, 33 insertions(+), 36 deletions(-) (limited to 'src') diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp index 4df28f410..e893330ff 100644 --- a/src/station_cmd.cpp +++ b/src/station_cmd.cpp @@ -720,21 +720,24 @@ CommandCost CheckFlatLandBelow(TileIndex tile, uint w, uint h, DoCommandFlag fla return cost; } -static bool CanExpandRailroadStation(const Station *st, uint *fin, Axis axis) +/** + * Check whether we can expand the rail part of the given station. + * @param st the station to expand + * @param cur_ta the current (and if all is fine new) tile area of the rail part of the station + * @param axis the axis of the newly build rail + * @return true if we are allowed to extend + */ +static bool CanExpandRailStation(const Station *st, TileArea &cur_ta, Axis axis) { - uint curw = st->trainst_w; - uint curh = st->trainst_h; - TileIndex tile = fin[0]; - uint w = fin[1]; - uint h = fin[2]; + TileArea new_ta = cur_ta; if (_settings_game.station.nonuniform_stations) { /* determine new size of train station region.. */ - int x = min(TileX(st->train_tile), TileX(tile)); - int y = min(TileY(st->train_tile), TileY(tile)); - curw = max(TileX(st->train_tile) + curw, TileX(tile) + w) - x; - curh = max(TileY(st->train_tile) + curh, TileY(tile) + h) - y; - tile = TileXY(x, y); + int x = min(TileX(st->train_tile), TileX(cur_ta.tile)); + int y = min(TileY(st->train_tile), TileY(cur_ta.tile)); + new_ta.w = max(TileX(st->train_tile) + new_ta.w, TileX(cur_ta.tile) + cur_ta.w) - x; + new_ta.h = max(TileY(st->train_tile) + new_ta.h, TileY(cur_ta.tile) + cur_ta.h) - y; + new_ta.tile = TileXY(x, y); } else { /* do not allow modifying non-uniform stations, * the uniform-stations code wouldn't handle it well */ @@ -752,36 +755,33 @@ static bool CanExpandRailroadStation(const Station *st, uint *fin, Axis axis) } /* check if the new station adjoins the old station in either direction */ - if (curw == w && st->train_tile == tile + TileDiffXY(0, h)) { + if (new_ta.w == cur_ta.w && st->train_tile == cur_ta.tile + TileDiffXY(0, cur_ta.h)) { /* above */ - curh += h; - } else if (curw == w && st->train_tile == tile - TileDiffXY(0, curh)) { + new_ta.h += cur_ta.h; + } else if (new_ta.w == cur_ta.w && st->train_tile == cur_ta.tile - TileDiffXY(0, new_ta.h)) { /* below */ - tile -= TileDiffXY(0, curh); - curh += h; - } else if (curh == h && st->train_tile == tile + TileDiffXY(w, 0)) { + new_ta.tile -= TileDiffXY(0, new_ta.h); + new_ta.h += cur_ta.h; + } else if (new_ta.h == cur_ta.h && st->train_tile == cur_ta.tile + TileDiffXY(cur_ta.w, 0)) { /* to the left */ - curw += w; - } else if (curh == h && st->train_tile == tile - TileDiffXY(curw, 0)) { + new_ta.w += cur_ta.w; + } else if (new_ta.h == cur_ta.h && st->train_tile == cur_ta.tile - TileDiffXY(new_ta.w, 0)) { /* to the right */ - tile -= TileDiffXY(curw, 0); - curw += w; + new_ta.tile -= TileDiffXY(new_ta.w, 0); + new_ta.w += cur_ta.w; } else { _error_message = STR_NONUNIFORM_STATIONS_DISALLOWED; return false; } } /* make sure the final size is not too big. */ - if (curw > _settings_game.station.station_spread || curh > _settings_game.station.station_spread) { + if (new_ta.w > _settings_game.station.station_spread || new_ta.h > _settings_game.station.station_spread) { _error_message = STR_ERROR_STATION_TOO_SPREAD_OUT; return false; } - /* now tile contains the new value for st->train_tile - * curw, curh contain the new value for width and height */ - fin[0] = tile; - fin[1] = curw; - fin[2] = curh; + /* Update the current values with the new. */ + cur_ta = new_ta; return true; } @@ -872,10 +872,7 @@ CommandCost CmdBuildRailroadStation(TileIndex tile_org, DoCommandFlag flags, uin if (h_org > _settings_game.station.station_spread || w_org > _settings_game.station.station_spread) return CMD_ERROR; /* these values are those that will be stored in train_tile and station_platforms */ - uint finalvalues[3]; - finalvalues[0] = tile_org; - finalvalues[1] = w_org; - finalvalues[2] = h_org; + TileArea new_location = { tile_org, w_org, h_org }; /* Make sure the area below consists of clear tiles. (OR tiles belonging to a certain rail station) */ StationID est = INVALID_STATION; @@ -929,7 +926,7 @@ CommandCost CmdBuildRailroadStation(TileIndex tile_org, DoCommandFlag flags, uin /* check if we want to expanding an already existing station? */ if (!_settings_game.station.join_stations) return_cmd_error(STR_ERROR_TOO_CLOSE_TO_ANOTHER_RAILROAD); - if (!CanExpandRailroadStation(st, finalvalues, axis)) + if (!CanExpandRailStation(st, new_location, axis)) return CMD_ERROR; } @@ -985,11 +982,11 @@ CommandCost CmdBuildRailroadStation(TileIndex tile_org, DoCommandFlag flags, uin ret = CheckFlatLandBelow(tile_org, w_org, h_org, flags, 5 << axis, _settings_game.station.nonuniform_stations ? &est : NULL); if (CmdFailed(ret)) return ret; - st->train_tile = finalvalues[0]; - st->AddFacility(FACIL_TRAIN, finalvalues[0]); + st->train_tile = new_location.tile; + st->AddFacility(FACIL_TRAIN, new_location.tile); - st->trainst_w = finalvalues[1]; - st->trainst_h = finalvalues[2]; + st->trainst_w = new_location.w; + st->trainst_h = new_location.h; st->rect.BeforeAddRect(tile_org, w_org, h_org, StationRect::ADD_TRY); -- cgit v1.2.3-70-g09d2