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belugas

(svn r13226) -Feature: Allow to have more than only two airports per town. The number of airports is now controlled by the noise each of them generates, the distance from town's center and how tolerant the town is.
Initial concept : TTDPatch (moreairpots), Initial code : Pasky
Thanks to BigBB (help coding), Smatz Skidd13 and frosch for bugcatches and advices

/* $Id$ */

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

#ifndef LANDSCAPE_H
#define LANDSCAPE_H

#include "core/geometry_type.hpp"
#include "tile_cmd.h"
#include "slope_type.h"
#include "direction_type.h"

enum {
	SNOW_LINE_MONTHS = 12,
	SNOW_LINE_DAYS   = 32,
};

struct SnowLine {
	byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS];
	byte highest_value;
};

bool IsSnowLineSet(void);
void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
byte GetSnowLine(void);
byte HighestSnowLine(void);
void ClearSnowLine(void);

uint GetPartialZ(int x, int y, Slope corners);
uint GetSlopeZ(int x, int y);
void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
int GetSlopeZInCorner(Slope tileh, Corner corner);
Slope GetFoundationSlope(TileIndex tile, uint* z);

static inline Point RemapCoords(int x, int y, int z)
{
	Point pt;
	pt.x = (y - x) * 2;
	pt.y = y + x - z;
	return pt;
}

static inline Point RemapCoords2(int x, int y)
{
	return RemapCoords(x, y, GetSlopeZ(x, y));
}

uint ApplyFoundationToSlope(Foundation f, Slope *s);
void DrawFoundation(TileInfo *ti, Foundation f);

void DoClearSquare(TileIndex tile);
void RunTileLoop();

void InitializeLandscape();
void GenerateLandscape(byte mode);

TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng);

#endif /* LANDSCAPE_H */