src/tile_map.cpp
author convert-repo
Mon, 07 Apr 2008 16:21:55 +0000
changeset 10076 dfd70e42c4ae
parent 8844 b4f9ff470b85
child 10429 1b99254f9607
permissions -rw-r--r--
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/* $Id$ */
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/** @file tile_map.cpp */
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#include "stdafx.h"
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#include "openttd.h"
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#include "tile_map.h"
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#include "core/math_func.hpp"
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Slope GetTileSlope(TileIndex tile, uint *h)
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{
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	uint a;
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	uint b;
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	uint c;
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	uint d;
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	uint min;
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	uint r;
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	assert(tile < MapSize());
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	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
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		if (h != NULL) *h = 0;
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		return SLOPE_FLAT;
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	}
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	min = a = TileHeight(tile);
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	b = TileHeight(tile + TileDiffXY(1, 0));
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	if (min > b) min = b;
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	c = TileHeight(tile + TileDiffXY(0, 1));
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	if (min > c) min = c;
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	d = TileHeight(tile + TileDiffXY(1, 1));
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	if (min > d) min = d;
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	r = SLOPE_FLAT;
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	if ((a -= min) != 0) r += (--a << 4) + SLOPE_N;
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	if ((c -= min) != 0) r += (--c << 4) + SLOPE_E;
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	if ((d -= min) != 0) r += (--d << 4) + SLOPE_S;
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	if ((b -= min) != 0) r += (--b << 4) + SLOPE_W;
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	if (h != NULL) *h = min * TILE_HEIGHT;
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	return (Slope)r;
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}
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uint GetTileZ(TileIndex tile)
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{
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	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) return 0;
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	uint h = TileHeight(tile);
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	h = min(h, TileHeight(tile + TileDiffXY(1, 0)));
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	h = min(h, TileHeight(tile + TileDiffXY(0, 1)));
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	h = min(h, TileHeight(tile + TileDiffXY(1, 1)));
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	return h * TILE_HEIGHT;
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}
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uint GetTileMaxZ(TileIndex t)
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{
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	if (TileX(t) == MapMaxX() || TileY(t) == MapMaxY()) return 0;
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	uint h = TileHeight(t);
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	h = max(h, TileHeight(t + TileDiffXY(1, 0)));
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	h = max(h, TileHeight(t + TileDiffXY(0, 1)));
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	h = max(h, TileHeight(t + TileDiffXY(1, 1)));
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	return h * TILE_HEIGHT;
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}