69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
/* $Id$ */
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/** @file tile_map.cpp Global tile accessors. */
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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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}
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