(svn r18674) -Feature (FS#3459): Configurable slope steepness for trains from 0% to 10%, default is 3% as before (mostly by Terkhen)

src/lang/english.txt

@@ -1082,6 +1082,7 @@ STR_CONFIG_SETTING_MAMMOTHTRAINS                                :{LTBLUE}Enable
 STR_CONFIG_SETTING_TRAIN_ACCELERATION_MODEL                     :{LTBLUE}Train acceleration model: {ORANGE}{STRING1}
 STR_CONFIG_SETTING_TRAIN_ACCELERATION_MODEL_ORIGINAL            :Original
 STR_CONFIG_SETTING_TRAIN_ACCELERATION_MODEL_REALISTIC           :Realistic
+STR_CONFIG_SETTING_TRAIN_SLOPE_STEEPNESS                        :{LTBLUE}Slope steepness for trains {ORANGE}{STRING1}%
 STR_CONFIG_SETTING_FORBID_90_DEG                                :{LTBLUE}Forbid trains and ships to make 90 deg turns: {ORANGE}{STRING1} {LTBLUE} (not with OPF)
 STR_CONFIG_SETTING_JOINSTATIONS                                 :{LTBLUE}Join train stations built next to each other: {ORANGE}{STRING1}
 STR_CONFIG_SETTING_DISTANT_JOIN_STATIONS                        :{LTBLUE}Allow to join stations not directly adjacent: {ORANGE}{STRING1}

src/saveload/saveload.cpp

@@ -47,7 +47,7 @@
 
 #include "saveload_internal.h"
 
-extern const uint16 SAVEGAME_VERSION = 132;
+extern const uint16 SAVEGAME_VERSION = 133;
 
 SavegameType _savegame_type; ///< type of savegame we are loading
 

src/settings_gui.cpp

@@ -1427,6 +1427,7 @@ static SettingsPage _settings_vehicles_servicing_page = {_settings_vehicles_serv
 
 static SettingEntry _settings_vehicles_trains[] = {
 	SettingEntry("vehicle.train_acceleration_model"),
+	SettingEntry("vehicle.train_slope_steepness"),
 	SettingEntry("vehicle.mammoth_trains"),
 	SettingEntry("gui.lost_train_warn"),
 	SettingEntry("vehicle.wagon_speed_limits"),

src/settings_type.h

@@ -307,6 +307,7 @@ struct OrderSettings {
 struct VehicleSettings {
 	bool   mammoth_trains;                   ///< allow very long trains
 	uint8  train_acceleration_model;         ///< realistic acceleration for trains
+	uint8  train_slope_steepness;            ///< Steepness of hills for trains when using realistic acceleration
 	bool   wagon_speed_limits;               ///< enable wagon speed limits
 	bool   disable_elrails;                  ///< when true, the elrails are disabled
 	UnitID max_trains;                       ///< max trains in game per company

src/table/settings.h

@@ -372,6 +372,7 @@ const SettingDesc _settings[] = {
 	 SDT_CONDVAR(GameSettings, economy.found_town,                   SLE_UINT8,128, SL_MAX_VERSION, 0,MS,TF_FORBIDDEN,TF_BEGIN,TF_END - 1, 1, STR_CONFIG_SETTING_TOWN_FOUNDING, TownFoundingChanged),
 
 	     SDT_VAR(GameSettings, vehicle.train_acceleration_model,     SLE_UINT8,                     0,MS,     0,     0,       1, 1, STR_CONFIG_SETTING_TRAIN_ACCELERATION_MODEL, TrainAccelerationModelChanged),
+	 SDT_CONDVAR(GameSettings, vehicle.train_slope_steepness,        SLE_UINT8,133, SL_MAX_VERSION, 0, 0,     3,     0,      10, 1, STR_CONFIG_SETTING_TRAIN_SLOPE_STEEPNESS,  NULL),
 	    SDT_BOOL(GameSettings, pf.forbid_90_deg,                                                    0, 0, false,                    STR_CONFIG_SETTING_FORBID_90_DEG,          NULL),
 	    SDT_BOOL(GameSettings, vehicle.mammoth_trains,                                              0,NN,  true,                    STR_CONFIG_SETTING_MAMMOTHTRAINS,          NULL),
 	    SDT_BOOL(GameSettings, order.gotodepot,                                                     0, 0,  true,                    STR_CONFIG_SETTING_GOTODEPOT,              NULL),

src/train_cmd.cpp

@@ -523,9 +523,9 @@ static int GetTrainAcceleration(Train *v, bool mode)
 		if (u->track == TRACK_BIT_DEPOT) max_speed = min(max_speed, 61);
 
 		if (HasBit(u->flags, VRF_GOINGUP)) {
-			incl += u->tcache.cached_veh_weight * 60; // 3% slope, quite a bit actually
+			incl += u->tcache.cached_veh_weight * 20 * _settings_game.vehicle.train_slope_steepness;
 		} else if (HasBit(u->flags, VRF_GOINGDOWN)) {
-			incl -= u->tcache.cached_veh_weight * 60;
+			incl -= u->tcache.cached_veh_weight * 20 * _settings_game.vehicle.train_slope_steepness;
 		}
 	}