src/autoslope.h

   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 autoslope.h Functions related to autoslope. */
  11
  12 #ifndef AUTOSLOPE_H
  13 #define AUTOSLOPE_H
  14
  15 #include "company_func.h"
  16 #include "depot_func.h"
  17 #include "tile_map.h"
  18
  19 /**
  20  * Autoslope check for tiles with an entrance on an edge.
  21  * E.g. depots and non-drive-through-road-stops.
  22  *
  23  * The test succeeds if the slope is not steep and at least one corner of the entrance edge is on the TileMaxZ() level.
  24  *
  25  * @note The test does not check if autoslope is enabled at all.
  26  *
  27  * @param tile The tile.
  28  * @param z_new New TileZ.
  29  * @param tileh_new New TileSlope.
  30  * @param entrance Entrance edge.
  31  * @return true iff terraforming is allowed.
  32  */
  33 static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, int z_new, Slope tileh_new, DiagDirection entrance)
  34 {
  35         if (GetTileMaxZ(tile) != z_new + GetSlopeMaxZ(tileh_new)) return false;
  36         return ((tileh_new == SLOPE_FLAT) || CanBuildDepotByTileh(entrance, tileh_new));
  37 }
  38
  39 /**
  40  * Tests if autoslope is enabled for _current_company.
  41  *
  42  * Autoslope is disabled for town/industry construction.
  43  *
  44  * @return true iff autoslope is enabled.
  45  */
  46 static inline bool AutoslopeEnabled()
  47 {
  48         return (_settings_game.construction.autoslope &&
  49                 (_current_company < MAX_COMPANIES ||
  50                  (_current_company == OWNER_NONE && _game_mode == GM_EDITOR)));
  51 }
  52
  53 #endif /* AUTOSLOPE_H */