(svn r26885) -Feature-ish: user interface for limiting the maximum height of a map

8 files changed, 92 insertions, 23 deletions

diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index 55235fb35..649ad55ff 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -84,9 +84,9 @@ static const NWidgetPart _nested_generate_landscape_widgets[] = {
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_LAND_GENERATOR, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TERRAIN_TYPE, STR_NULL), SetFill(1, 1),
+					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_VARIETY, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_SEA_LAKES, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
-					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_VARIETY, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BORDER_TYPE, STR_NULL), SetFill(1, 1),
 				EndContainer(),
 				/* Widgets at the right of the labels. */
@@ -100,34 +100,41 @@ static const NWidgetPart _nested_generate_landscape_widgets[] = {
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_LANDSCAPE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TERRAIN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
+					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_VARIETY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_WATER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
-					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_VARIETY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_BORDERS_RANDOM), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 				EndContainer(),
 			EndContainer(),
 			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
 				NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
 					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
-						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
+						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
+						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SMOOTHNESS, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
 					EndContainer(),
 					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
-						/* Starting date. */
+						/* Max. heightlevel. */
 						NWidget(NWID_HORIZONTAL),
-							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
-							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
-							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
+							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
 						EndContainer(),
 						/* Snow line. */
 						NWidget(NWID_HORIZONTAL),
 							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
-							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
 							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
 						EndContainer(),
+						/* Starting date. */
+						NWidget(NWID_HORIZONTAL),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
+							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
+						EndContainer(),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_SMOOTHNESS_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
@@ -194,11 +201,11 @@ static const NWidgetPart _nested_heightmap_load_widgets[] = {
 			NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_NAME, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAPSIZE, STR_NULL), SetFill(1, 1),
+				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_ROTATION, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
-				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_ROTATION, STR_NULL), SetFill(1, 1),
 			EndContainer(),
 			/* Widgets at the right of the labels. */
 			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
@@ -211,31 +218,37 @@ static const NWidgetPart _nested_heightmap_load_widgets[] = {
 							NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BY, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(1, 1),
 							NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_Y_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL), SetFill(1, 0),
 						EndContainer(),
+						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
-						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					EndContainer(),
 					NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
 							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE_LABEL, STR_NULL), SetFill(1, 1),
-								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
+								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
+								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 							EndContainer(),
 							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 								NWidget(WWT_TEXT, COLOUR_ORANGE, WID_GL_HEIGHTMAP_SIZE_TEXT), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE, STR_NULL), SetFill(1, 0),
 								NWidget(NWID_HORIZONTAL),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
+									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
+								EndContainer(),
+								NWidget(NWID_HORIZONTAL),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
+									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
+								EndContainer(),
+								NWidget(NWID_HORIZONTAL),
 									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
 									NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
 									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
 								EndContainer(),
-								NWidget(NWID_HORIZONTAL),
-									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
-									NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
-									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
-								EndContainer(),
 							EndContainer(),
 						EndContainer(),
 						NWidget(NWID_SPACER), SetFill(1, 1),
@@ -324,10 +337,11 @@ struct GenerateLandscapeWindow : public Window {
 	virtual void SetStringParameters(int widget) const
 	{
 		switch (widget) {
-			case WID_GL_START_DATE_TEXT:     SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1)); break;
-			case WID_GL_MAPSIZE_X_PULLDOWN:  SetDParam(0, 1 << _settings_newgame.game_creation.map_x); break;
-			case WID_GL_MAPSIZE_Y_PULLDOWN:  SetDParam(0, 1 << _settings_newgame.game_creation.map_y); break;
-			case WID_GL_SNOW_LEVEL_TEXT:     SetDParam(0, _settings_newgame.game_creation.snow_line_height); break;
+			case WID_GL_START_DATE_TEXT:      SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1)); break;
+			case WID_GL_MAPSIZE_X_PULLDOWN:   SetDParam(0, 1 << _settings_newgame.game_creation.map_x); break;
+			case WID_GL_MAPSIZE_Y_PULLDOWN:   SetDParam(0, 1 << _settings_newgame.game_creation.map_y); break;
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT: SetDParam(0, _settings_newgame.construction.max_heightlevel); break;
+			case WID_GL_SNOW_LEVEL_TEXT:      SetDParam(0, _settings_newgame.game_creation.snow_line_height); break;
 
 			case WID_GL_TOWN_PULLDOWN:
 				if (_game_mode == GM_EDITOR) {
@@ -413,6 +427,8 @@ struct GenerateLandscapeWindow : public Window {
 		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_TEXT, _settings_newgame.game_creation.landscape != LT_ARCTIC);
 
 		/* Update availability of decreasing / increasing start date and snow level */
+		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_DOWN, _settings_newgame.construction.max_heightlevel <= MIN_MAX_HEIGHTLEVEL);
+		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_UP, _settings_newgame.construction.max_heightlevel >= MAX_MAX_HEIGHTLEVEL);
 		this->SetWidgetDisabledState(WID_GL_START_DATE_DOWN, _settings_newgame.game_creation.starting_year <= MIN_YEAR);
 		this->SetWidgetDisabledState(WID_GL_START_DATE_UP,   _settings_newgame.game_creation.starting_year >= MAX_YEAR);
 		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_DOWN, _settings_newgame.game_creation.snow_line_height <= MIN_SNOWLINE_HEIGHT || _settings_newgame.game_creation.landscape != LT_ARCTIC);
@@ -430,6 +446,11 @@ struct GenerateLandscapeWindow : public Window {
 	{
 		const StringID *strs = NULL;
 		switch (widget) {
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
+				SetDParam(0, MAX_TILE_HEIGHT);
+				*size = GetStringBoundingBox(STR_JUST_INT);
+				break;
+
 			case WID_GL_START_DATE_TEXT:
 				SetDParam(0, ConvertYMDToDate(MAX_YEAR, 0, 1));
 				*size = maxdim(*size, GetStringBoundingBox(STR_BLACK_DATE_LONG));
@@ -562,6 +583,25 @@ struct GenerateLandscapeWindow : public Window {
 				break;
 			}
 
+			case WID_GL_MAX_HEIGHTLEVEL_DOWN:
+			case WID_GL_MAX_HEIGHTLEVEL_UP: // Height level buttons
+				/* Don't allow too fast scrolling */
+				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
+					this->HandleButtonClick(widget);
+
+					_settings_newgame.construction.max_heightlevel = Clamp(_settings_newgame.construction.max_heightlevel + widget - WID_GL_MAX_HEIGHTLEVEL_TEXT, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
+					this->InvalidateData();
+				}
+				_left_button_clicked = false;
+				break;
+
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT: // Height level text
+				this->widget_id = WID_GL_MAX_HEIGHTLEVEL_TEXT;
+				SetDParam(0, _settings_newgame.construction.max_heightlevel);
+				ShowQueryString(STR_JUST_INT, STR_MAPGEN_MAX_HEIGHTLEVEL_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ENABLE_DEFAULT);
+				break;
+
+
 			case WID_GL_START_DATE_DOWN:
 			case WID_GL_START_DATE_UP: // Year buttons
 				/* Don't allow too fast scrolling */
@@ -666,7 +706,7 @@ struct GenerateLandscapeWindow : public Window {
 
 	virtual void OnTimeout()
 	{
-		static const int raise_widgets[] = {WID_GL_START_DATE_DOWN, WID_GL_START_DATE_UP, WID_GL_SNOW_LEVEL_UP, WID_GL_SNOW_LEVEL_DOWN, WIDGET_LIST_END};
+		static const int raise_widgets[] = {WID_GL_MAX_HEIGHTLEVEL_DOWN, WID_GL_MAX_HEIGHTLEVEL_UP, WID_GL_START_DATE_DOWN, WID_GL_START_DATE_UP, WID_GL_SNOW_LEVEL_UP, WID_GL_SNOW_LEVEL_DOWN, WIDGET_LIST_END};
 		for (const int *widget = raise_widgets; *widget != WIDGET_LIST_END; widget++) {
 			if (this->IsWidgetLowered(*widget)) {
 				this->RaiseWidget(*widget);
@@ -735,6 +775,7 @@ struct GenerateLandscapeWindow : public Window {
 		} else {
 			/* An empty string means revert to the default */
 			switch (this->widget_id) {
+				case WID_GL_MAX_HEIGHTLEVEL_TEXT: value = DEF_MAX_HEIGHTLEVEL; break;
 				case WID_GL_START_DATE_TEXT: value = DEF_START_YEAR; break;
 				case WID_GL_SNOW_LEVEL_TEXT: value = DEF_SNOWLINE_HEIGHT; break;
 				case WID_GL_TOWN_PULLDOWN:   value = 1; break;
@@ -744,6 +785,11 @@ struct GenerateLandscapeWindow : public Window {
 		}
 
 		switch (this->widget_id) {
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
+				this->SetWidgetDirty(WID_GL_MAX_HEIGHTLEVEL_TEXT);
+				_settings_newgame.construction.max_heightlevel = Clamp(value, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
+				break;
+
 			case WID_GL_START_DATE_TEXT:
 				this->SetWidgetDirty(WID_GL_START_DATE_TEXT);
 				_settings_newgame.game_creation.starting_year = Clamp(value, MIN_YEAR, MAX_YEAR);
diff --git a/src/lang/english.txt b/src/lang/english.txt
index e095edfe1..a1b57d1c3 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -1158,6 +1158,9 @@ STR_CONFIG_SETTING_DISASTERS_HELPTEXT                           :Toggle disaster
 STR_CONFIG_SETTING_CITY_APPROVAL                                :Town council's attitude towards area restructuring: {STRING2}
 STR_CONFIG_SETTING_CITY_APPROVAL_HELPTEXT                       :Choose how much noise and environmental damage by companies affect their town rating and further construction actions in their area
 
+STR_CONFIG_SETTING_MAX_HEIGHTLEVEL                              :Maximum map height: {STRING2}
+STR_CONFIG_SETTING_MAX_HEIGHTLEVEL_HELPTEXT                     :Set the maximum allowed height for mountains on the map
+STR_CONFIG_SETTING_TOO_HIGH_MOUNTAIN                            :{WHITE}You can't set the maximum map height to this value. At least one mountain on the map is higher
 STR_CONFIG_SETTING_AUTOSLOPE                                    :Allow landscaping under buildings, tracks, etc.: {STRING2}
 STR_CONFIG_SETTING_AUTOSLOPE_HELPTEXT                           :Allow landscaping under buildings and tracks without removing them
 STR_CONFIG_SETTING_CATCHMENT                                    :Allow more realistically sized catchment areas: {STRING2}
@@ -1788,6 +1791,8 @@ STR_CHEAT_CHANGE_COMPANY                                        :{LTBLUE}Playing
 STR_CHEAT_EXTRA_DYNAMITE                                        :{LTBLUE}Magic bulldozer (remove industries, unmovable objects): {ORANGE}{STRING1}
 STR_CHEAT_CROSSINGTUNNELS                                       :{LTBLUE}Tunnels may cross each other: {ORANGE}{STRING1}
 STR_CHEAT_NO_JETCRASH                                           :{LTBLUE}Jetplanes will not crash (frequently) on small airports: {ORANGE}{STRING}
+STR_CHEAT_EDIT_MAX_HL                                           :{LTBLUE}Edit the maximum map height: {ORANGE}{NUM}
+STR_CHEAT_EDIT_MAX_HL_QUERY_CAPT                                :{WHITE}Edit the maximum height of mountains on the map
 STR_CHEAT_SWITCH_CLIMATE_TEMPERATE_LANDSCAPE                    :Temperate landscape
 STR_CHEAT_SWITCH_CLIMATE_SUB_ARCTIC_LANDSCAPE                   :Sub-arctic landscape
 STR_CHEAT_SWITCH_CLIMATE_SUB_TROPICAL_LANDSCAPE                 :Sub-tropical landscape
@@ -2713,6 +2718,9 @@ STR_MAPGEN_BY                                                   :{BLACK}*
 STR_MAPGEN_NUMBER_OF_TOWNS                                      :{BLACK}No. of towns:
 STR_MAPGEN_DATE                                                 :{BLACK}Date:
 STR_MAPGEN_NUMBER_OF_INDUSTRIES                                 :{BLACK}No. of industries:
+STR_MAPGEN_MAX_HEIGHTLEVEL                                      :{BLACK}Maximum map height:
+STR_MAPGEN_MAX_HEIGHTLEVEL_UP                                   :{BLACK}Increase the maximum height of mountains on the map by one
+STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN                                 :{BLACK}Decrease the maximum height of mountains on the map by one
 STR_MAPGEN_SNOW_LINE_HEIGHT                                     :{BLACK}Snow line height:
 STR_MAPGEN_SNOW_LINE_UP                                         :{BLACK}Move the snow line height one up
 STR_MAPGEN_SNOW_LINE_DOWN                                       :{BLACK}Move the snow line height one down
@@ -2742,6 +2750,7 @@ STR_MAPGEN_HEIGHTMAP_NAME                                       :{BLACK}Heightma
 STR_MAPGEN_HEIGHTMAP_SIZE_LABEL                                 :{BLACK}Size:
 STR_MAPGEN_HEIGHTMAP_SIZE                                       :{ORANGE}{NUM} x {NUM}
 
+STR_MAPGEN_MAX_HEIGHTLEVEL_QUERY_CAPT                           :{WHITE}Change maximum map height
 STR_MAPGEN_SNOW_LINE_QUERY_CAPT                                 :{WHITE}Change snow line height
 STR_MAPGEN_START_DATE_QUERY_CAPT                                :{WHITE}Change starting year
 
diff --git a/src/script/api/game/game_window.hpp.sq b/src/script/api/game/game_window.hpp.sq
index 084dd77e2..80b43c08b 100644
--- a/src/script/api/game/game_window.hpp.sq
+++ b/src/script/api/game/game_window.hpp.sq
@@ -461,6 +461,9 @@ void SQGSWindow_Register(Squirrel *engine)
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_TOWN_PULLDOWN,                      "WID_GL_TOWN_PULLDOWN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_INDUSTRY_PULLDOWN,                  "WID_GL_INDUSTRY_PULLDOWN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_GENERATE_BUTTON,                    "WID_GL_GENERATE_BUTTON");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_MAX_HEIGHTLEVEL_DOWN,               "WID_GL_MAX_HEIGHTLEVEL_DOWN");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_MAX_HEIGHTLEVEL_TEXT,               "WID_GL_MAX_HEIGHTLEVEL_TEXT");
+	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_MAX_HEIGHTLEVEL_UP,                 "WID_GL_MAX_HEIGHTLEVEL_UP");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_START_DATE_DOWN,                    "WID_GL_START_DATE_DOWN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_START_DATE_TEXT,                    "WID_GL_START_DATE_TEXT");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_GL_START_DATE_UP,                      "WID_GL_START_DATE_UP");
diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
index 099d90fb2..f9d659108 100644
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -1293,6 +1293,10 @@ public:
 
 		WID_GL_GENERATE_BUTTON                       = ::WID_GL_GENERATE_BUTTON,                       ///< 'Generate' button.
 
+		WID_GL_MAX_HEIGHTLEVEL_DOWN                  = ::WID_GL_MAX_HEIGHTLEVEL_DOWN,                  ///< Decrease max. heightlevel
+		WID_GL_MAX_HEIGHTLEVEL_TEXT                  = ::WID_GL_MAX_HEIGHTLEVEL_TEXT,                  ///< Max. heightlevel
+		WID_GL_MAX_HEIGHTLEVEL_UP                    = ::WID_GL_MAX_HEIGHTLEVEL_UP,                    ///< Increase max. heightlevel
+
 		WID_GL_START_DATE_DOWN                       = ::WID_GL_START_DATE_DOWN,                       ///< Decrease start year.
 		WID_GL_START_DATE_TEXT                       = ::WID_GL_START_DATE_TEXT,                       ///< Start year.
 		WID_GL_START_DATE_UP                         = ::WID_GL_START_DATE_UP,                         ///< Increase start year.
diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index bd8eb91ca..799edf73d 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -1499,6 +1499,7 @@ static SettingsContainer &GetSettingsTree()
 			SettingsPage *construction = interface->Add(new SettingsPage(STR_CONFIG_SETTING_INTERFACE_CONSTRUCTION));
 			{
 				construction->Add(new SettingEntry("gui.link_terraform_toolbar"));
+				construction->Add(new SettingEntry("construction.max_heightlevel"));
 				construction->Add(new SettingEntry("gui.enable_signal_gui"));
 				construction->Add(new SettingEntry("gui.persistent_buildingtools"));
 				construction->Add(new SettingEntry("gui.quick_goto"));
diff --git a/src/table/settings.ini b/src/table/settings.ini
index a2d6841fd..ad59eb30a 100644
--- a/src/table/settings.ini
+++ b/src/table/settings.ini
@@ -387,6 +387,8 @@ def      = DEF_MAX_HEIGHTLEVEL
 min      = MIN_MAX_HEIGHTLEVEL
 max      = MAX_MAX_HEIGHTLEVEL
 interval = 1
+str      = STR_CONFIG_SETTING_MAX_HEIGHTLEVEL
+strhelp  = STR_CONFIG_SETTING_MAX_HEIGHTLEVEL_HELPTEXT
 strval   = STR_JUST_INT
 cat      = SC_BASIC
 
diff --git a/src/terraform_cmd.cpp b/src/terraform_cmd.cpp
index 82554d43e..2d36a101e 100644
--- a/src/terraform_cmd.cpp
+++ b/src/terraform_cmd.cpp
@@ -106,7 +106,7 @@ static CommandCost TerraformTileHeight(TerraformerState *ts, TileIndex tile, int
 
 	/* Check range of destination height */
 	if (height < 0) return_cmd_error(STR_ERROR_ALREADY_AT_SEA_LEVEL);
-	if (height > (int)MAX_TILE_HEIGHT) return_cmd_error(STR_ERROR_TOO_HIGH);
+	if (height > _settings_game.construction.max_heightlevel) return_cmd_error(STR_ERROR_TOO_HIGH);
 
 	/*
 	 * Check if the terraforming has any effect.
@@ -360,7 +360,7 @@ CommandCost CmdLevelLand(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 	}
 
 	/* Check range of destination height */
-	if (h > MAX_TILE_HEIGHT) return_cmd_error((oldh == 0) ? STR_ERROR_ALREADY_AT_SEA_LEVEL : STR_ERROR_TOO_HIGH);
+	if (h > _settings_game.construction.max_heightlevel) return_cmd_error((oldh == 0) ? STR_ERROR_ALREADY_AT_SEA_LEVEL : STR_ERROR_TOO_HIGH);
 
 	Money money = GetAvailableMoneyForCommand();
 	CommandCost cost(EXPENSES_CONSTRUCTION);
diff --git a/src/widgets/genworld_widget.h b/src/widgets/genworld_widget.h
index 2048851ff..877efbb92 100644
--- a/src/widgets/genworld_widget.h
+++ b/src/widgets/genworld_widget.h
@@ -27,6 +27,10 @@ enum GenerateLandscapeWidgets {
 
 	WID_GL_GENERATE_BUTTON,             ///< 'Generate' button.
 
+	WID_GL_MAX_HEIGHTLEVEL_DOWN,        ///< Decrease max. heightlevel
+	WID_GL_MAX_HEIGHTLEVEL_TEXT,        ///< Max. heightlevel
+	WID_GL_MAX_HEIGHTLEVEL_UP,          ///< Increase max. heightlevel
+
 	WID_GL_START_DATE_DOWN,             ///< Decrease start year.
 	WID_GL_START_DATE_TEXT,             ///< Start year.
 	WID_GL_START_DATE_UP,               ///< Increase start year.