yapf_costbase.hpp

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00001 /* $Id: yapf_costbase.hpp 23640 2011-12-20 17:57:56Z truebrain $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef YAPF_COSTBASE_HPP
00013 #define YAPF_COSTBASE_HPP
00014 
00016 struct CYapfCostBase {
00023   inline static bool stSlopeCost(TileIndex tile, Trackdir td)
00024   {
00025     if (IsDiagonalTrackdir(td)) {
00026       if (IsBridgeTile(tile)) {
00027         /* it is bridge ramp, check if we are entering the bridge */
00028         if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are leaving it, no penalty
00029         /* we are entering the bridge */
00030         Slope tile_slope = GetTileSlope(tile);
00031         Axis axis = DiagDirToAxis(GetTunnelBridgeDirection(tile));
00032         return !HasBridgeFlatRamp(tile_slope, axis);
00033       } else {
00034         /* not bridge ramp */
00035         if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope
00036         Slope tile_slope = GetTileSlope(tile);
00037         return IsUphillTrackdir(tile_slope, td); // slopes uphill => apply penalty
00038       }
00039     }
00040     return false;
00041   }
00042 };
00043 
00044 #endif /* YAPF_COSTBASE_HPP */