author | glx |
Sun, 08 Apr 2007 14:46:55 +0000 | |
branch | noai |
changeset 9574 | 698395509d12 |
parent 5838 | 9c3129cb019b |
child 6743 | cabfaa4a0295 |
child 7819 | 694a7dacd30a |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file tile.cpp */ |
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#include "stdafx.h" |
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#include "tile.h" |
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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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uint h; |
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GetTileSlope(tile, &h); |
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return h; |
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} |
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uint GetTileMaxZ(TileIndex t) |
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{ |
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uint max; |
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uint h; |
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h = TileHeight(t); |
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max = h; |
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h = TileHeight(t + TileDiffXY(1, 0)); |
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if (h > max) max = h; |
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h = TileHeight(t + TileDiffXY(0, 1)); |
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if (h > max) max = h; |
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h = TileHeight(t + TileDiffXY(1, 1)); |
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if (h > max) max = h; |
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return max * 8; |
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} |