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/* $Id$ */

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/** @file landscape.h Functions related to OTTD's landscape. */

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#ifndef LANDSCAPE_H

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#define LANDSCAPE_H

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#include "core/geometry_type.hpp"

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#include "tile_cmd.h"

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#include "slope_type.h"

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#include "direction_type.h"

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enum {

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	SNOW_LINE_MONTHS = 12, ///< Number of months in the snow line table.

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	SNOW_LINE_DAYS   = 32, ///< Number of days in each month in the snow line table.

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};

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/** Structure describing the height of the snow line each day of the year

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 * @ingroup SnowLineGroup */

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struct SnowLine {

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	byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]; ///< Height of the snow line each day of the year

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	byte highest_value; ///< Highest snow line of the year

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};

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bool IsSnowLineSet(void);

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void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);

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byte GetSnowLine(void);

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byte HighestSnowLine(void);

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void ClearSnowLine(void);

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uint GetPartialZ(int x, int y, Slope corners);

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uint GetSlopeZ(int x, int y);

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void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);

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int GetSlopeZInCorner(Slope tileh, Corner corner);

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Slope GetFoundationSlope(TileIndex tile, uint* z);

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static inline Point RemapCoords(int x, int y, int z)

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{

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	Point pt;

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	pt.x = (y - x) * 2;

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	pt.y = y + x - z;

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	return pt;

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}

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static inline Point RemapCoords2(int x, int y)

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{

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	return RemapCoords(x, y, GetSlopeZ(x, y));

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}

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uint ApplyFoundationToSlope(Foundation f, Slope *s);

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void DrawFoundation(TileInfo *ti, Foundation f);

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void DoClearSquare(TileIndex tile);

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void RunTileLoop();

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void InitializeLandscape();

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void GenerateLandscape(byte mode);

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TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng);

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#endif /* LANDSCAPE_H */