/* static */ uint ScriptRail::GetRailTracks(TileIndex tile)
{
if (!IsRailTile(tile)) return RAILTRACK_INVALID;
if (IsRailStationTile(tile) || IsRailWaypointTile(tile)) return ::TrackToTrackBits(::GetRailStationTrack(tile));
if (IsLevelCrossingTile(tile)) return ::GetCrossingRailBits(tile);
if (IsRailDepotTile(tile)) return ::TRACK_BIT_NONE;
return ::GetTrackBits(tile);
}
/* static */ bool AIRail::BuildRailWaypoint(TileIndex tile)
{
EnforcePrecondition(false, ::IsValidTile(tile));
EnforcePrecondition(false, IsRailTile(tile));
EnforcePrecondition(false, GetRailTracks(tile) == RAILTRACK_NE_SW || GetRailTracks(tile) == RAILTRACK_NW_SE);
EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
return AIObject::DoCommand(tile, GetCurrentRailType() | (GetRailTracks(tile) == RAILTRACK_NE_SW ? AXIS_X : AXIS_Y) << 4 | 1 << 8 | 1 << 16, STAT_CLASS_WAYP | INVALID_STATION << 16, CMD_BUILD_RAIL_WAYPOINT);
}
/* static */ bool ScriptRail::AreTilesConnected(TileIndex from, TileIndex tile, TileIndex to)
{
if (!IsRailTile(tile)) return false;
if (from == to || ScriptMap::DistanceManhattan(from, tile) != 1 || ScriptMap::DistanceManhattan(tile, to) != 1) return false;
if (to < from) ::Swap(from, to);
if (tile - from == 1) {
if (to - tile == 1) return (GetRailTracks(tile) & RAILTRACK_NE_SW) != 0;
if (to - tile == ::MapSizeX()) return (GetRailTracks(tile) & RAILTRACK_NE_SE) != 0;
} else if (tile - from == ::MapSizeX()) {
if (tile - to == 1) return (GetRailTracks(tile) & RAILTRACK_NW_NE) != 0;
if (to - tile == 1) return (GetRailTracks(tile) & RAILTRACK_NW_SW) != 0;
if (to - tile == ::MapSizeX()) return (GetRailTracks(tile) & RAILTRACK_NW_SE) != 0;
} else {
return (GetRailTracks(tile) & RAILTRACK_SW_SE) != 0;
}
NOT_REACHED();
}