Function GetAxisForNewRailWaypoint

src/waypoint_cmd.cpp:106–119

* Get the axis for a new rail waypoint. This means that if it is a valid * tile to build a waypoint on it returns a valid Axis, otherwise an * invalid one. * @param tile the tile to look at. * @return the axis for the to-be-build waypoint. */

 * @return the axis for the to-be-build waypoint.
 */
Axis GetAxisForNewRailWaypoint(TileIndex tile)
{
	/* The axis for rail waypoints is easy. */
	if (IsRailWaypointTile(tile)) return GetRailStationAxis(tile);

	/* Non-plain rail type, no valid axis for waypoints. */
	if (!IsTileType(tile, MP_RAILWAY) || GetRailTileType(tile) != RailTileType::Normal) return INVALID_AXIS;

	switch (GetTrackBits(tile)) {
		case TRACK_BIT_X: return AXIS_X;
		case TRACK_BIT_Y: return AXIS_Y;
		default:          return INVALID_AXIS;
	}
}

/**
 * Get the axis for a new road waypoint. This means that if it is a valid