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/* $Id$ */
/*
* 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/>.
*/
/** @file ai_map.hpp Everything to query and manipulate map metadata. */
#ifndef AI_MAP_HPP
#define AI_MAP_HPP
#include "ai_object.hpp"
#include "../../tile_type.h"
/**
* Class that handles all map related functions.
*/
class AIMap : public AIObject {
public:
static const int TILE_INVALID = (int)INVALID_TILE; ///< Invalid TileIndex.
static const char *GetClassName() { return "AIMap"; }
/**
* Checks whether the given tile is valid.
* @param tile The tile to check.
* @return True is the tile it within the boundaries of the map.
*/
static bool IsValidTile(TileIndex tile);
/**
* Gets the number of tiles in the map.
* @return The size of the map in tiles.
* @post Return value is always positive.
*/
static TileIndex GetMapSize();
/**
* Gets the amount of tiles along the SW and NE border.
* @return The length along the SW and NE borders.
* @post Return value is always positive.
*/
static uint32 GetMapSizeX();
/**
* Gets the amount of tiles along the SE and NW border.
* @return The length along the SE and NW borders.
* @post Return value is always positive.
*/
static uint32 GetMapSizeY();
/**
* Gets the place along the SW/NE border (X-value).
* @param tile The tile to get the X-value of.
* @pre IsValidTile(tile).
* @return The X-value.
* @post Return value is always lower than GetMapSizeX().
*/
static int32 GetTileX(TileIndex tile);
/**
* Gets the place along the SE/NW border (Y-value).
* @param tile The tile to get the Y-value of.
* @pre IsValidTile(tile).
* @return The Y-value.
* @post Return value is always lower than GetMapSizeY().
*/
static int32 GetTileY(TileIndex tile);
/**
* Gets the TileIndex given a x,y-coordinate.
* @param x The X coordinate.
* @param y The Y coordinate.
* @pre x < GetMapSizeX().
* @pre y < GetMapSizeY().
* @return The TileIndex for the given (x,y) coordinate.
*/
static TileIndex GetTileIndex(uint32 x, uint32 y);
/**
* Calculates the Manhattan distance; the difference of
* the X and Y added together.
* @param tile_from The start tile.
* @param tile_to The destination tile.
* @pre IsValidTile(tile_from).
* @pre IsValidTile(tile_to).
* @return The Manhattan distance between the tiles.
*/
static int32 DistanceManhattan(TileIndex tile_from, TileIndex tile_to);
/**
* Calculates the distance between two tiles via 1D calculation.
* This means the distance between X or the distance between Y, depending
* on which one is bigger.
* @param tile_from The start tile.
* @param tile_to The destination tile.
* @pre IsValidTile(tile_from).
* @pre IsValidTile(tile_to).
* @return The maximum distance between the tiles.
*/
static int32 DistanceMax(TileIndex tile_from, TileIndex tile_to);
/**
* The squared distance between the two tiles.
* This is the distance is the length of the shortest straight line
* between both points.
* @param tile_from The start tile.
* @param tile_to The destination tile.
* @pre IsValidTile(tile_from).
* @pre IsValidTile(tile_to).
* @return The squared distance between the tiles.
*/
static int32 DistanceSquare(TileIndex tile_from, TileIndex tile_to);
/**
* Calculates the shortest distance to the edge.
* @param tile From where the distance has to be calculated.
* @pre IsValidTile(tile).
* @return The distances to the closest edge.
*/
static int32 DistanceFromEdge(TileIndex tile);
};
#endif /* AI_MAP_HPP */
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