59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/* $Id$ */
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#include "stdafx.h"
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#include "tile.h"
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/** Converts the heights of 4 corners into a tileh, and returns the minimum height of the tile
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* @param n,w,e,s the four corners
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* @param h uint pointer to write the height to
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* @return the tileh
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*/
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uint GetTileh(uint n, uint w, uint e, uint s, uint *h)
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{
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uint min = n;
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uint r;
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if (min >= w) min = w;
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if (min >= e) min = e;
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if (min >= s) min = s;
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r = 0;
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if ((n -= min) != 0) r += (--n << 4) + 8;
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if ((e -= min) != 0) r += (--e << 4) + 4;
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if ((s -= min) != 0) r += (--s << 4) + 2;
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if ((w -= min) != 0) r += (--w << 4) + 1;
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if (h != NULL) *h = min * TILE_HEIGHT;
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return r;
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}
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uint 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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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 0;
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}
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a = TileHeight(tile);
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b = TileHeight(tile + TileDiffXY(1, 0));
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c = TileHeight(tile + TileDiffXY(0, 1));
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d = TileHeight(tile + TileDiffXY(1, 1));
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return GetTileh(a, b, c, d, h);
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}
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uint GetTileZ(TileIndex tile)
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{
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uint h;
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GetTileSlope(tile, &h);
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return h;
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}
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