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-rw-r--r--clear_cmd.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/clear_cmd.c b/clear_cmd.c
index 19b475124..62331b73c 100644
--- a/clear_cmd.c
+++ b/clear_cmd.c
@@ -94,20 +94,19 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
assert(tile < MapSize());
- if ((r=TerraformAllowTileProcess(ts, tile)) <= 0)
- return r;
+ r = TerraformAllowTileProcess(ts, tile);
+ if (r <= 0) return r;
if (IsTileType(tile, MP_RAILWAY)) {
- static const TrackBits _railway_modes[] = { TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER, TRACK_BIT_RIGHT };
- static const byte _railway_dangslopes[4] = {0xd, 0xe, 7, 0xb};
- static const byte _railway_dangslopes2[4] = {0x2, 0x1, 0x8, 0x4};
+ static const TrackBits safe_track[] = { TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER, TRACK_BIT_RIGHT };
+ static const Slope unsafe_slope[] = { SLOPE_S, SLOPE_W, SLOPE_N, SLOPE_E };
// Nothing could be built at the steep slope - this avoids a bug
// when you have a single diagonal track in one corner on a
// basement and then you raise/lower the other corner.
- int tileh = GetTileSlope(tile, NULL) & 0xF;
- if (tileh == _railway_dangslopes[mode] ||
- tileh == _railway_dangslopes2[mode]) {
+ Slope tileh = GetTileSlope(tile, NULL);
+ if (tileh == unsafe_slope[mode] ||
+ tileh == ComplementSlope(unsafe_slope[mode])) {
_terraform_err_tile = tile;
_error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
return -1;
@@ -115,7 +114,7 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
// If we have a single diagonal track there, the other side of
// tile can be terraformed.
- if (IsPlainRailTile(tile) && GetTrackBits(tile) == _railway_modes[mode]) {
+ if (IsPlainRailTile(tile) && GetTrackBits(tile) == safe_track[mode]) {
return 0;
}
}