Change: Add configurable curve penalty for ships.

src/pathfinder/yapf/yapf_ship.cpp

@@ -169,6 +169,21 @@ protected:
 	}
 
 public:
+	inline int CurveCost(Trackdir td1, Trackdir td2)
+	{
+		assert(IsValidTrackdir(td1));
+		assert(IsValidTrackdir(td2));
+
+		if (HasTrackdir(TrackdirCrossesTrackdirs(td1), td2)) {
+			/* 90-deg curve penalty */
+			return Yapf().PfGetSettings().ship_curve90_penalty;
+		} else if (td2 != NextTrackdir(td1)) {
+			/* 45-deg curve penalty */
+			return Yapf().PfGetSettings().ship_curve45_penalty;
+		}
+		return 0;
+	}
+
 	/**
 	 * Called by YAPF to calculate the cost from the origin to the given node.
 	 *  Calculates only the cost of given node, adds it to the parent node cost
@@ -179,10 +194,7 @@ public:
 		/* base tile cost depending on distance */
 		int c = IsDiagonalTrackdir(n.GetTrackdir()) ? YAPF_TILE_LENGTH : YAPF_TILE_CORNER_LENGTH;
 		/* additional penalty for curves */
-		if (n.GetTrackdir() != NextTrackdir(n.m_parent->GetTrackdir())) {
+		c += CurveCost(n.m_parent->GetTrackdir(), n.GetTrackdir());
-			/* new trackdir does not match the next one when going straight */
-			c += YAPF_TILE_LENGTH;
-		}
 
 		/* Skipped tile cost for aqueducts. */
 		c += YAPF_TILE_LENGTH * tf->m_tiles_skipped;

src/saveload/saveload.h

@@ -292,6 +292,7 @@ enum SaveLoadVersion : uint16 {
 	SLV_SHIPS_STOP_IN_LOCKS,                ///< 206  PR#7150 Ship/lock movement changes.
 	SLV_FIX_CARGO_MONITOR,                  ///< 207  PR#7175 v1.9  Cargo monitor data packing fix to support 64 cargotypes.
 	SLV_TOWN_CARGOGEN,                      ///< 208  PR#6965 New algorithms for town building cargo generation.
+	SLV_SHIP_CURVE_PENALTY,                 ///< 209  PR#7289 Configurable ship curve penalties.
 
 	SL_MAX_VERSION,                         ///< Highest possible saveload version
 };

src/settings_type.h

@@ -418,6 +418,8 @@ struct YAPFSettings {
 	uint32 rail_longer_platform_per_tile_penalty;  ///< penalty for longer  station platform than train (per tile)
 	uint32 rail_shorter_platform_penalty;          ///< penalty for shorter station platform than train
 	uint32 rail_shorter_platform_per_tile_penalty; ///< penalty for shorter station platform than train (per tile)
+	uint32 ship_curve45_penalty;                   ///< penalty for 45-deg curve for ships
+	uint32 ship_curve90_penalty;                   ///< penalty for 90-deg curve for ships
 };
 
 /** Settings related to all pathfinders. */

src/table/settings.ini

@@ -2163,6 +2163,26 @@ min      = 0
 max      = 1000000
 cat      = SC_EXPERT
 
+[SDT_VAR]
+base     = GameSettings
+var      = pf.yapf.ship_curve45_penalty
+type     = SLE_UINT
+from     = SLV_SHIP_CURVE_PENALTY
+def      = 1 * YAPF_TILE_LENGTH
+min      = 0
+max      = 1000000
+cat      = SC_EXPERT
+
+[SDT_VAR]
+base     = GameSettings
+var      = pf.yapf.ship_curve90_penalty
+type     = SLE_UINT
+from     = SLV_SHIP_CURVE_PENALTY
+def      = 6 * YAPF_TILE_LENGTH
+min      = 0
+max      = 1000000
+cat      = SC_EXPERT
+
 ##
 [SDT_VAR]
 base     = GameSettings