+
−/* $Id$ */
+
−
+
−/** @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;
+
−}