From 276055a5743d205004a89d318e6b783c4e051619 Mon Sep 17 00:00:00 2001 From: tron Date: Sun, 25 Jun 2006 18:58:45 +0000 Subject: (svn r5365) -Fix: It was possible to dig into a tunnel if certain rail combinations were ontop of it (Hopefully this time it works for real) --- clear_cmd.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'clear_cmd.c') diff --git a/clear_cmd.c b/clear_cmd.c index 62331b73c..7cb068b6c 100644 --- a/clear_cmd.c +++ b/clear_cmd.c @@ -101,10 +101,13 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode) 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 }; + Slope tileh; + uint z; + // 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. - Slope tileh = GetTileSlope(tile, NULL); + tileh = GetTileSlope(tile, &z); if (tileh == unsafe_slope[mode] || tileh == ComplementSlope(unsafe_slope[mode])) { _terraform_err_tile = tile; @@ -115,6 +118,18 @@ 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) == safe_track[mode]) { + /* If terraforming downwards prevent damaging a potential tunnel below. + * This check is only necessary for flat tiles, because if the tile is + * non-flat, then the corner opposing the rail is raised. Only this corner + * can be lowered and this is a safe action + */ + if (tileh == SLOPE_FLAT && + ts->direction == -1 && + IsTunnelInWay(tile, z - TILE_HEIGHT)) { + _terraform_err_tile = tile; + _error_message = STR_1002_EXCAVATION_WOULD_DAMAGE; + return -1; + } return 0; } } -- cgit v1.2.3-54-g00ecf