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/* $Id$ */

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/** @file map_type.h Types related to maps. */

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#ifndef MAP_TYPE_H

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#define MAP_TYPE_H

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/**

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 * Data that is stored per tile. Also used TileExtended for this.

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 * Look at docs/landscape.html for the exact meaning of the members.

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 */

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struct Tile {

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	byte   type_height; ///< The type (bits 4..7) and height of the northern corner

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	byte   m1;          ///< Primarily used for ownership information

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	uint16 m2;          ///< Primarily used for indices to towns, industries and stations

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	byte   m3;          ///< General purpose

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	byte   m4;          ///< General purpose

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	byte   m5;          ///< General purpose

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	byte   m6;          ///< Primarily used for bridges and rainforest/desert

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};

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/**

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 * Data that is stored per tile. Also used Tile for this.

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 * Look at docs/landscape.html for the exact meaning of the members.

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 */

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struct TileExtended {

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	byte m7; ///< Primarily used for newgrf support

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};

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/**

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 * An offset value between to tiles.

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 *

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 * This value is used fro the difference between

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 * to tiles. It can be added to a tileindex to get

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 * the resulting tileindex of the start tile applied

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 * with this saved difference.

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 *

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 * @see TileDiffXY(int, int)

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 */

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typedef int32 TileIndexDiff;

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/**

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 * A pair-construct of a TileIndexDiff.

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 *

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 * This can be used to save the difference between to

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 * tiles as a pair of x and y value.

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 */

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struct TileIndexDiffC {

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	int16 x;        ///< The x value of the coordinate

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	int16 y;        ///< The y value of the coordinate

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};

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/**

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 * Approximation of the length of a straight track, relative to a diagonal

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 * track (ie the size of a tile side).

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 *

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 * #defined instead of const so it can

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 * stay integer. (no runtime float operations) Is this needed?

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 * Watch out! There are _no_ brackets around here, to prevent intermediate

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 * rounding! Be careful when using this!

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 * This value should be sqrt(2)/2 ~ 0.7071

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 */

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#define STRAIGHT_TRACK_LENGTH 7071/10000

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#endif /* MAP_TYPE_H */