mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-16 00:12:51 +00:00
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/* $Id$ */
|
|
|
|
#include "stdafx.h"
|
|
#include "tile.h"
|
|
|
|
/** Converts the heights of 4 corners into a tileh, and returns the minimum height of the tile
|
|
* @param n,w,e,s the four corners
|
|
* @param h uint pointer to write the height to
|
|
* @return the tileh
|
|
*/
|
|
Slope GetTileh(uint n, uint w, uint e, uint s, uint *h)
|
|
{
|
|
uint min = n;
|
|
Slope r;
|
|
|
|
if (min >= w) min = w;
|
|
if (min >= e) min = e;
|
|
if (min >= s) min = s;
|
|
|
|
r = SLOPE_FLAT;
|
|
if ((n -= min) != 0) r += (--n << 4) + SLOPE_N;
|
|
if ((e -= min) != 0) r += (--e << 4) + SLOPE_E;
|
|
if ((s -= min) != 0) r += (--s << 4) + SLOPE_S;
|
|
if ((w -= min) != 0) r += (--w << 4) + SLOPE_W;
|
|
|
|
if (h != NULL) *h = min * TILE_HEIGHT;
|
|
|
|
return r;
|
|
}
|
|
|
|
Slope GetTileSlope(TileIndex tile, uint *h)
|
|
{
|
|
uint a;
|
|
uint b;
|
|
uint c;
|
|
uint d;
|
|
|
|
assert(tile < MapSize());
|
|
|
|
if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
|
|
if (h != NULL) *h = 0;
|
|
return 0;
|
|
}
|
|
|
|
a = TileHeight(tile);
|
|
b = TileHeight(tile + TileDiffXY(1, 0));
|
|
c = TileHeight(tile + TileDiffXY(0, 1));
|
|
d = TileHeight(tile + TileDiffXY(1, 1));
|
|
|
|
return GetTileh(a, b, c, d, h);
|
|
}
|
|
|
|
uint GetTileZ(TileIndex tile)
|
|
{
|
|
uint h;
|
|
GetTileSlope(tile, &h);
|
|
return h;
|
|
}
|