rubidium@8079: /* $Id$ */
rubidium@8079: 
rubidium@10429: /** @file autoslope.h Functions related to autoslope. */
rubidium@8079: 
rubidium@8079: #ifndef AUTOSLOPE_H
rubidium@8079: #define AUTOSLOPE_H
rubidium@8079: 
rubidium@8707: #include "settings_type.h"
rubidium@8750: #include "player_func.h"
rubidium@10222: #include "depot_func.h"
rubidium@8079: 
rubidium@8079: /**
rubidium@8079:  * Autoslope check for tiles with an entrance on an edge.
rubidium@8079:  * E.g. depots and non-drive-through-road-stops.
rubidium@8079:  *
rubidium@8079:  * The test succeeds if the slope is not steep and at least one corner of the entrance edge is on the TileMaxZ() level.
rubidium@8079:  *
rubidium@8079:  * @note The test does not check if autoslope is enabled at all.
rubidium@8079:  *
rubidium@8079:  * @param tile The tile.
rubidium@8079:  * @param z_new New TileZ.
rubidium@8079:  * @param tileh_new New TileSlope.
rubidium@8079:  * @param entrance Entrance edge.
rubidium@8079:  * @return true iff terraforming is allowed.
rubidium@8079:  */
rubidium@8079: static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, uint z_new, Slope tileh_new, DiagDirection entrance)
rubidium@8079: {
rubidium@8079: 	if (IsSteepSlope(tileh_new) || (GetTileMaxZ(tile) != z_new + GetSlopeMaxZ(tileh_new))) return false;
rubidium@8079: 	return ((tileh_new == SLOPE_FLAT) || CanBuildDepotByTileh(entrance, tileh_new));
rubidium@8079: }
rubidium@8079: 
rubidium@8079: /**
rubidium@8079:  * Tests if autoslope is enabled for _current_player.
rubidium@8079:  *
rubidium@8079:  * Autoslope is disabled for town/industry construction and old ai players.
rubidium@8079:  *
rubidium@8079:  * @return true iff autoslope is enabled.
rubidium@8079:  */
rubidium@8079: static inline bool AutoslopeEnabled()
rubidium@8079: {
rubidium@10775: 	return (_settings_game.construction.autoslope &&
rubidium@11161: 	        ((IsValidPlayerID(_current_player) && !_is_old_ai_player) ||
rubidium@8136: 	         (_current_player == OWNER_NONE && _game_mode == GM_EDITOR)));
rubidium@8079: }
rubidium@8079: 
rubidium@8079: #endif /* AUTOSLOPE_H */