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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 tile_map.cpp Global tile accessors. */

#include "stdafx.h"
#include "openttd.h"
#include "tile_map.h"
#include "core/math_func.hpp"

Slope GetTileSlope(TileIndex tile, uint *h)
{
	uint a;
	uint b;
	uint c;
	uint d;
	uint min;
	uint r;

	assert(tile < MapSize());

	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
		if (h != NULL) *h = 0;
		return SLOPE_FLAT;
	}

	min = a = TileHeight(tile);
	b = TileHeight(tile + TileDiffXY(1, 0));
	if (min > b) min = b;
	c = TileHeight(tile + TileDiffXY(0, 1));
	if (min > c) min = c;
	d = TileHeight(tile + TileDiffXY(1, 1));
	if (min > d) min = d;

	r = SLOPE_FLAT;
	if ((a -= min) != 0) r += (--a << 4) + SLOPE_N;
	if ((c -= min) != 0) r += (--c << 4) + SLOPE_E;
	if ((d -= min) != 0) r += (--d << 4) + SLOPE_S;
	if ((b -= min) != 0) r += (--b << 4) + SLOPE_W;

	if (h != NULL) *h = min * TILE_HEIGHT;

	return (Slope)r;
}

uint GetTileZ(TileIndex tile)
{
	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) return 0;

	uint h = TileHeight(tile);
	h = min(h, TileHeight(tile + TileDiffXY(1, 0)));
	h = min(h, TileHeight(tile + TileDiffXY(0, 1)));
	h = min(h, TileHeight(tile + TileDiffXY(1, 1)));

	return h * TILE_HEIGHT;
}


uint GetTileMaxZ(TileIndex t)
{
	if (TileX(t) == MapMaxX() || TileY(t) == MapMaxY()) return 0;

	uint h = TileHeight(t);
	h = max(h, TileHeight(t + TileDiffXY(1, 0)));
	h = max(h, TileHeight(t + TileDiffXY(0, 1)));
	h = max(h, TileHeight(t + TileDiffXY(1, 1)));

	return h * TILE_HEIGHT;
}