1

/* $Id$ */

     2

     3

/** @file autoslope.h Functions related to autoslope. */

     4

     5

#ifndef AUTOSLOPE_H

     6

#define AUTOSLOPE_H

     7

     8

#include "settings_type.h"

     9

#include "player_func.h"

    10

#include "depot_func.h"

    11

    12

/**

    13

 * Autoslope check for tiles with an entrance on an edge.

    14

 * E.g. depots and non-drive-through-road-stops.

    15

 *

    16

 * The test succeeds if the slope is not steep and at least one corner of the entrance edge is on the TileMaxZ() level.

    17

 *

    18

 * @note The test does not check if autoslope is enabled at all.

    19

 *

    20

 * @param tile The tile.

    21

 * @param z_new New TileZ.

    22

 * @param tileh_new New TileSlope.

    23

 * @param entrance Entrance edge.

    24

 * @return true iff terraforming is allowed.

    25

 */

    26

static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, uint z_new, Slope tileh_new, DiagDirection entrance)

    27

{

    28

	if (IsSteepSlope(tileh_new) || (GetTileMaxZ(tile) != z_new + GetSlopeMaxZ(tileh_new))) return false;

    29

	return ((tileh_new == SLOPE_FLAT) || CanBuildDepotByTileh(entrance, tileh_new));

    30

}

    31

    32

/**

    33

 * Tests if autoslope is enabled for _current_player.

    34

 *

    35

 * Autoslope is disabled for town/industry construction and old ai players.

    36

 *

    37

 * @return true iff autoslope is enabled.

    38

 */

    39

static inline bool AutoslopeEnabled()

    40

{

    41

	return (_settings_game.construction.autoslope &&

    42

	        ((IsValidPlayerID(_current_player) && !_is_old_ai_player) ||

    43

	         (_current_player == OWNER_NONE && _game_mode == GM_EDITOR)));

    44

}

    45

    46

#endif /* AUTOSLOPE_H */