cpp/openttd-patchpack/source Files · src/tile.cpp

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Location: cpp/openttd-patchpack/source/src/tile.cpp

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maedhros

(svn r10114) -Fix: Only load newgrf error messages if the language matches the current
language. Since only one error can be loaded anyway, if the language didn't
match you'd get "Undefined string". Also since we're only loading one language
there's no need to use AddGRFString any more.

/* $Id$ */

/** @file tile.cpp */

#include "stdafx.h"
#include "tile.h"

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)
{
	uint h;
	GetTileSlope(tile, &h);
	return h;
}


uint GetTileMaxZ(TileIndex t)
{
	uint max;
	uint h;

	h = TileHeight(t);
	max = h;
	h = TileHeight(t + TileDiffXY(1, 0));
	if (h > max) max = h;
	h = TileHeight(t + TileDiffXY(0, 1));
	if (h > max) max = h;
	h = TileHeight(t + TileDiffXY(1, 1));
	if (h > max) max = h;
	return max * 8;
}