Allows configuring the height at which rainforests start, which by default was controlled by dividing the map maxheight by 4 in landscape.cpp. Default setting is 8 which matches and should provide default behavior in new map creation.

src/landscape.cpp

@@ -995,7 +995,7 @@ static void CreateDesertOrRainForest()
 {
 	TileIndex update_freq = MapSize() / 4;
 	const TileIndexDiffC *data;
-	uint max_desert_height = CeilDiv(_settings_game.construction.max_heightlevel, 4);
+	uint max_desert_height = _settings_game.game_creation.rainforest_line_height;
 
 	for (TileIndex tile = 0; tile != MapSize(); ++tile) {
 		if ((tile % update_freq) == 0) IncreaseGeneratingWorldProgress(GWP_LANDSCAPE);

src/lang/english.txt

@@ -1447,6 +1447,8 @@ STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE                        :Maximum distanc
 STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE_HELPTEXT               :Limit for how far from the map border oil refineries and oil rigs can be constructed. On island maps this ensures they are near the coast. On maps larger than 256 tiles, this value is scaled up.
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT                              :Snow line height: {STRING2}
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT                     :Control at what height snow starts in sub-arctic landscape. Snow also affects industry generation and town growth requirements
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT                        :Rainforest line height: {STRING}
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT_HELPTEXT               :Control at what height rainforest starts in sub-tropic landscape. Snow also affects industry generation and town growth requirements
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN                         :Roughness of terrain: {STRING2}
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_HELPTEXT                :(TerraGenesis only) Choose the frequency of hills: Smooth landscapes have fewer, more wide-spread hills. Rough landscapes have many hills, which may look repetitive
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_SMOOTH             :Very Smooth

src/lang/english_AU.txt

@@ -1273,6 +1273,8 @@ STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE                        :Maximum distanc
 STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE_HELPTEXT               :Oil refineries are only constructed near the map border, that is at the coast for island maps
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT                              :Snow line height: {STRING}
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT                     :Control at what height snow starts in sub-arctic landscape. Snow also affects industry generation and town growth requirements
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT                        :Rainforest line height: {STRING}
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT_HELPTEXT               :Control at what height rainforest starts in sub-tropic landscape. Snow also affects industry generation and town growth requirements
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN                         :Roughness of terrain: {STRING}
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_HELPTEXT                :(TerraGenesis only) Choose the frequency of hills: Smooth landscapes have fewer, more wide-spread hills. Rough landscapes have many hills, which may look repetitive
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_SMOOTH             :Very Smooth

src/lang/english_US.txt

@@ -1339,6 +1339,8 @@ STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE                        :Maximum distanc
 STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE_HELPTEXT               :Limit for how far from the map border oil refineries and oil rigs can be constructed. On island maps this ensures they are near the coast. On maps larger than 256 tiles, this value is scaled up.
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT                              :Snow line height: {STRING}
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT                     :Control at what height snow starts in sub-arctic landscape. Snow also affects industry generation and town growth requirements
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT                        :Rainforest line height: {STRING}
+STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT_HELPTEXT               :Control at what height rainforest starts in sub-tropic landscape. Snow also affects industry generation and town growth requirements
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN                         :Roughness of terrain: {STRING}
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_HELPTEXT                :(TerraGenesis only) Choose the frequency of hills: Smooth landscapes have fewer, more wide-spread hills. Rough landscapes have many hills, which may look repetitive
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_SMOOTH             :Very Smooth

src/settings_gui.cpp

@@ -1814,6 +1814,7 @@ static SettingsContainer &GetSettingsTree()
 			genworld->Add(new SettingEntry("game_creation.tgen_smoothness"));
 			genworld->Add(new SettingEntry("game_creation.variety"));
 			genworld->Add(new SettingEntry("game_creation.snow_line_height"));
+			genworld->Add(new SettingEntry("game_creation.rainforest_line_height"));
 			genworld->Add(new SettingEntry("game_creation.amount_of_rivers"));
 			genworld->Add(new SettingEntry("game_creation.tree_placer"));
 			genworld->Add(new SettingEntry("vehicle.road_side"));

src/settings_type.h

@@ -361,6 +361,7 @@ struct GameCreationSettings {
 	byte   land_generator;                   ///< the landscape generator
 	byte   oil_refinery_limit;               ///< distance oil refineries allowed from map edge
 	byte   snow_line_height;                 ///< the configured snow line height
+	byte   rainforest_line_height;           ///< the configured rainforest line height
 	byte   tgen_smoothness;                  ///< how rough is the terrain from 0-3
 	byte   tree_placer;                      ///< the tree placer algorithm
 	byte   heightmap_rotation;               ///< rotation director for the heightmap

src/table/settings.ini

@@ -2217,6 +2217,20 @@ strhelp  = STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT
 strval   = STR_JUST_COMMA
 cat      = SC_BASIC
 
+[SDT_VAR]
+base     = GameSettings
+var      = game_creation.rainforest_line_height
+type     = SLE_UINT8
+guiflags = SGF_NO_NETWORK
+def      = 8
+min      = 1
+max      = 255
+interval = 1
+str      = STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT
+strhelp  = STR_CONFIG_SETTING_RAINFORESTLINE_HEIGHT_HELPTEXT
+strval   = STR_JUST_COMMA
+cat      = SC_BASIC
+
 ;;game_creation.desert_amount
 [SDT_NULL]
 length   = 1