/**
* Clean up unnecessary RoadBits of a planed tile.
* @param tile current tile
* @param org_rb planed RoadBits
* @return optimised RoadBits
*/
RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
{
if (!IsValidTile(tile)) return ROAD_NONE;
for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
/* Get the Roadbit pointing to the neighbor_tile */
const RoadBits target_rb = DiagDirToRoadBits(dir);
/* If the roadbit is in the current plan */
if (org_rb & target_rb) {
bool connective = false;
const RoadBits mirrored_rb = MirrorRoadBits(target_rb);
if (IsValidTile(neighbor_tile)) {
switch (GetTileType(neighbor_tile)) {
/* Always connective ones */
case MP_CLEAR: case MP_TREES:
connective = true;
break;
/* The conditionally connective ones */
case MP_TUNNELBRIDGE:
case MP_STATION:
case MP_ROAD:
if (IsNormalRoadTile(neighbor_tile)) {
/* Always connective */
connective = true;
} else {
const RoadBits neighbor_rb = GetAnyRoadBits(neighbor_tile, ROADTYPE_ROAD) | GetAnyRoadBits(neighbor_tile, ROADTYPE_TRAM);
/* Accept only connective tiles */
connective = (neighbor_rb & mirrored_rb) != ROAD_NONE;
}
break;
case MP_RAILWAY:
connective = IsPossibleCrossing(neighbor_tile, DiagDirToAxis(dir));
break;
case MP_WATER:
/* Check for real water tile */
connective = !IsWater(neighbor_tile);
break;
/* The definitely not connective ones */
default: break;
}
}
/* If the neighbor tile is inconnective, remove the planed road connection to it */
if (!connective) org_rb ^= target_rb;
}
}
return org_rb;
}
/**
* If required, connects a new structure to an existing road or tram by building the missing roadbit.
* @param tile Tile containing the structure to connect.
* @param direction Direction to check.
*/
void ConnectRoadToStructure(TileIndex tile, DiagDirection direction)
{
tile += TileOffsByDiagDir(direction);
/* if there is a roadpiece just outside of the station entrance, build a connecting route */
if (IsNormalRoadTile(tile)) {
if (GetRoadBits(tile, _cur_roadtype) != ROAD_NONE) {
DoCommandP(tile, _cur_roadtype << 4 | DiagDirToRoadBits(ReverseDiagDir(direction)), 0, CMD_BUILD_ROAD);
}
}
}
/** Tests if a tile is a road tile with a single tramtrack (tram can reverse) */
static DiagDirection GetSingleTramBit(TileIndex tile)
{
if (IsNormalRoadTile(tile)) {
RoadBits rb = GetRoadBits(tile, ROADTYPE_TRAM);
switch (rb) {
case ROAD_NW: return DIAGDIR_NW;
case ROAD_SW: return DIAGDIR_SW;
case ROAD_SE: return DIAGDIR_SE;
case ROAD_NE: return DIAGDIR_NE;
default: break;
}
}
return INVALID_DIAGDIR;
}
/** Tests if a tile is a road tile with a single tramtrack (tram can reverse) */
FORCEINLINE DiagDirection GetSingleTramBit(TileIndex tile)
{
assert(IsTram()); // this function shouldn't be called in other cases
if (IsNormalRoadTile(tile)) {
RoadBits rb = GetRoadBits(tile, ROADTYPE_TRAM);
switch (rb) {
case ROAD_NW: return DIAGDIR_NW;
case ROAD_SW: return DIAGDIR_SW;
case ROAD_SE: return DIAGDIR_SE;
case ROAD_NE: return DIAGDIR_NE;
default: break;
}
}
return INVALID_DIAGDIR;
}
/* static */ bool ScriptRoad::AreRoadTilesConnected(TileIndex t1, TileIndex t2)
{
if (!::IsValidTile(t1)) return false;
if (!::IsValidTile(t2)) return false;
if (!IsRoadTypeAvailable(GetCurrentRoadType())) return false;
/* Tiles not neighbouring */
if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
RoadBits r1 = ::GetAnyRoadBits(t1, ScriptObject::GetRoadType());
RoadBits r2 = ::GetAnyRoadBits(t2, ScriptObject::GetRoadType());
uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
uint dir_2 = 2 ^ dir_1;
DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
}