/**
* Callback to start placing a bridge.
* @param tile Start tile of the bridge.
*/
static void PlaceRoad_Bridge(TileIndex tile, Window *w)
{
if (IsBridgeTile(tile)) {
TileIndex other_tile = GetOtherTunnelBridgeEnd(tile);
Point pt = {0, 0};
w->OnPlaceMouseUp(VPM_X_OR_Y, DDSP_BUILD_BRIDGE, pt, other_tile, tile);
} else {
VpStartPlaceSizing(tile, VPM_X_OR_Y, DDSP_BUILD_BRIDGE);
}
}
static typename TileIndexT<Tgeneric>::T GetBridgeEnd(typename TileIndexT<Tgeneric>::T tile, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDiagDir<Tgeneric>(dir, MapOf(tile));
dir = ReverseDiagDir(dir);
do {
tile += delta;
} while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir);
return tile;
}
/**
* Finds the end of a bridge in the specified direction starting at a middle tile
* @param tile the bridge tile to find the bridge ramp for
* @param dir the direction to search in
*/
static TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDiagDir(dir);
dir = ReverseDiagDir(dir);
do {
tile += delta;
} while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir);
return tile;
}
/**
* Does the given track direction on the given tile yeild an uphill penalty?
* @param tile The tile to check.
* @param td The track direction to check.
* @return True if there's a slope, otherwise false.
*/
FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)
{
if (IsDiagonalTrackdir(td)) {
if (IsBridgeTile(tile)) {
/* it is bridge ramp, check if we are entering the bridge */
if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are leaving it, no penalty
/* we are entering the bridge */
Slope tile_slope = GetTileSlope(tile, NULL);
Axis axis = DiagDirToAxis(GetTunnelBridgeDirection(tile));
return !HasBridgeFlatRamp(tile_slope, axis);
} else {
/* not bridge ramp */
if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope
Slope tile_slope = GetTileSlope(tile, NULL);
return IsUphillTrackdir(tile_slope, td); // slopes uphill => apply penalty
}
}
return false;
}
typename TileIndexT<Tgeneric>::T GetOtherBridgeEnd(typename TileIndexT<Tgeneric>::T tile)
{
assert(IsBridgeTile(tile));
return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
}
/**
* Starting at one bridge end finds the other bridge end
* @param t the bridge ramp tile to find the other bridge ramp for
*/
TileIndex GetOtherBridgeEnd(TileIndex tile)
{
assert(IsBridgeTile(tile));
return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
}
