Add: Option for toggling the airport specific ground tile.

src/airport_cmd.cpp

@@ -1089,6 +1089,45 @@ CommandCost CmdAirportChangeGFX(DoCommandFlag flags, TileIndex start_tile, TileI
 	return CommandCost();
 }
 
+CommandCost CmdAirportToogleGround(DoCommandFlag flags, TileIndex start_tile, TileIndex end_tile, AirType air_type, bool diagonal)
+{
+	CommandCost ret = CheckSettingBuildByTile();
+	if (ret.Failed()) return ret;
+
+	/* Check air type. */
+	if (!ValParamAirType(air_type)) return_cmd_error(STR_ERROR_AIRPORT_INCORRECT_AIRTYPE);
+	if (air_type == AIRTYPE_WATER) return_cmd_error(STR_ERROR_AIRCRAFT_INCOMPATIBLE_AIR_TYPE);
+
+	std::unique_ptr<TileIterator> iter;
+	if (diagonal) {
+		iter = std::make_unique<DiagonalTileIterator>(start_tile, end_tile);
+	} else {
+		iter = std::make_unique<OrthogonalTileIterator>(start_tile, end_tile);
+	}
+
+	for (; *iter != INVALID_TILE; ++(*iter)) {
+		Tile tile = Tile(*iter);
+		if (!IsAirportTile(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
+		if (air_type != GetAirType(tile)) return_cmd_error(STR_ERROR_AIRCRAFT_INCOMPATIBLE_AIR_TYPE);
+
+		if (CheckTileOwnership(tile).Failed()) {
+			/* We don't own it!. */
+			return_cmd_error(STR_ERROR_OWNED_BY);
+		}
+
+		if (flags & DC_EXEC) {
+			if (GetAirportGround(tile) == AIRPORT_AIRTYPE) {
+				SetAirportGroundAndDensity(tile, AIRPORT_GRASS, 0);
+			} else {
+				SetAirportGroundAndDensity(tile, AIRPORT_AIRTYPE, 0);
+			}
+			MarkTileDirtyByTile(tile);
+		}
+	}
+
+	return CommandCost();
+}
+
 CommandCost RemoveAirportTiles(DoCommandFlag flags, TileIndex start_tile, TileIndex end_tile, AirType air_type)
 {
 	if (!IsValidTile(end_tile)) return CMD_ERROR;

src/airport_cmd.h

@@ -24,6 +24,7 @@ CommandCost CmdAddRemoveAirportTiles(DoCommandFlag flags, TileIndex start_tile,
 CommandCost CmdAddRemoveTracksToAirport(DoCommandFlag flags, TileIndex start_tile, TileIndex end_tile, AirType air_type, bool add, Track track);
 CommandCost CmdChangeAirType(DoCommandFlag flags, TileIndex tile, AirType air_type);
 CommandCost CmdAirportChangeGFX(DoCommandFlag flags, TileIndex start_tile, TileIndex end_tile, AirType air_type, bool diagonal);
+CommandCost CmdAirportToogleGround(DoCommandFlag flags, TileIndex start_tile, TileIndex end_tile, AirType air_type, bool diagonal);
 
 CommandCost CmdBuildAirport(DoCommandFlag flags, TileIndex tile, uint8_t airport_type, uint8_t layout, AirType air_type, DiagDirection rotation, StationID station_to_join, bool allow_adjacent);
 CommandCost CmdOpenCloseAirport(DoCommandFlag flags, StationID station_id);
@@ -33,6 +34,7 @@ DEF_CMD_TRAIT(CMD_ADD_REM_AIRPORT,       CmdAddRemoveAirportTiles,    CMD_AUTO,
 DEF_CMD_TRAIT(CMD_ADD_REM_TRACKS,        CmdAddRemoveTracksToAirport, CMD_AUTO,                CMDT_LANDSCAPE_CONSTRUCTION)
 DEF_CMD_TRAIT(CMD_CONVERT_AIRPORT,       CmdChangeAirType,            CMD_AUTO,                CMDT_LANDSCAPE_CONSTRUCTION)
 DEF_CMD_TRAIT(CMD_AIRPORT_CHANGE_GFX,    CmdAirportChangeGFX,         CMD_AUTO,                CMDT_LANDSCAPE_CONSTRUCTION)
+DEF_CMD_TRAIT(CMD_AIRPORT_TOGGLE_GROUND, CmdAirportToogleGround,      CMD_AUTO,                CMDT_LANDSCAPE_CONSTRUCTION)
 
 DEF_CMD_TRAIT(CMD_BUILD_AIRPORT,         CmdBuildAirport,             CMD_AUTO | CMD_NO_WATER, CMDT_LANDSCAPE_CONSTRUCTION)
 DEF_CMD_TRAIT(CMD_OPEN_CLOSE_AIRPORT,    CmdOpenCloseAirport,         0,                       CMDT_ROUTE_MANAGEMENT)

src/airport_gui.cpp

@@ -370,6 +370,11 @@ struct BuildAirToolbarWindow : Window {
 				this->last_user_action = widget;
 				break;
 
+			case WID_AT_TOGGLE_GROUND:
+				HandlePlacePushButton(this, widget, SPR_CURSOR_MOUSE, HT_RECT | HT_DIAGONAL);
+				this->last_user_action = widget;
+				break;
+
 			default: break;
 		}
 
@@ -425,6 +430,11 @@ struct BuildAirToolbarWindow : Window {
 				VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_BUILD_STATION);
 				break;
 
+
+			case WID_AT_TOGGLE_GROUND:
+				VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_BUILD_STATION);
+				break;
+
 			default: NOT_REACHED();
 		}
 	}
@@ -497,6 +507,10 @@ struct BuildAirToolbarWindow : Window {
 				Command<CMD_AIRPORT_CHANGE_GFX>::Post(STR_ERROR_CAN_T_DO_THIS, start_tile, end_tile, _cur_airtype, _ctrl_pressed);
 				break;
 
+			case WID_AT_TOGGLE_GROUND:
+				Command<CMD_AIRPORT_TOGGLE_GROUND>::Post(STR_ERROR_CAN_T_DO_THIS, start_tile, end_tile, _cur_airtype, _ctrl_pressed);
+				break;
+
 			default: NOT_REACHED();
 		}
 	}
@@ -616,6 +630,8 @@ static constexpr NWidgetPart _nested_air_tile_toolbar_widgets[] = {
 					SetDataTip(0, STR_TOOLBAR_AIRPORT_CHANGE_AIRTYPE),
 			NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_AT_CHANGE_GRAPHICS), SetFill(0, 1),
 					SetDataTip(STR_TOOLBAR_AIRPORT_ROTATE_GRAPHICS, STR_TOOLBAR_AIRPORT_ROTATE_GRAPHICS_TOOLTIP),
+			NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_AT_TOGGLE_GROUND), SetFill(0, 1),
+					SetDataTip(STR_TOOLBAR_AIRPORT_TOGGLE_GROUND, STR_TOOLBAR_AIRPORT_TOGGLE_GROUND_TOOLBAR),
 		EndContainer(),
 	EndContainer(),
 };
@@ -628,7 +644,7 @@ static const NWidgetPart _nested_air_nontile_toolbar_widgets[] = {
 	EndContainer(),
 	NWidget(NWID_HORIZONTAL),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_AT_AIRPORT), SetFill(0, 1), SetMinimalSize(42, 22),
-				SetDataTip(SPR_IMG_AIRPORT, STR_TOOLBAR_AIRCRAFT_BUILD_PRE_AIRPORT_TOOLTIP),
+				SetDataTip(SPR_IMG_AIRPORT, STR_TOOLBAR_AIRPORT_BUILD_PRE_AIRPORT_TOOLTIP),
 	NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetMinimalSize(4, 22), SetFill(1, 1), EndContainer(),
 		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, WID_AT_DEMOLISH), SetFill(0, 1), SetMinimalSize(22, 22), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
 	EndContainer(),

src/command_type.h

@@ -225,6 +225,7 @@ enum Commands : uint16_t {
 	CMD_CONVERT_AIRPORT,              ///< change the aiport type (gravel, asphalt, etc.)
 	CMD_BUILD_AIRPORT,                ///< build an airport layout
 	CMD_AIRPORT_CHANGE_GFX,           ///< change the graphics of an airport tile, if possible
+	CMD_AIRPORT_TOGGLE_GROUND,        ///< toggle between showing the specific airtype ground or not, if possible
 
 	CMD_BUILD_DOCK,                   ///< build a dock
 

src/lang/english.txt

@@ -3013,6 +3013,8 @@ STR_TOOLBAR_AIRPORT_BUILD_PRE_AIRPORT_TOOLTIP                  :{BLACK}Build a p
 STR_TOOLBAR_AIRPORT_CHANGE_AIRTYPE                             :{BLACK}Change the airtype of an airport
 STR_TOOLBAR_AIRPORT_ROTATE_GRAPHICS                            :{BLACK}Change track graphics
 STR_TOOLBAR_AIRPORT_ROTATE_GRAPHICS_TOOLTIP                    :{BLACK}Click over a simple airport tile to change its graphics (experimental; only works on the Drawn tracks airtype)
+STR_TOOLBAR_AIRPORT_TOGGLE_GROUND                              :{BLACK}Toogle ground graphics
+STR_TOOLBAR_AIRPORT_TOGGLE_GROUND_TOOLBAR                      :{BLACK}Click over a simple airport tile to show or hide the airtype ground sprite.
 
 STR_AIRTYPE_NAME_GRAVEL                                         :Gravel airport
 STR_AIRTYPE_NAME_ASPHALT                                        :Asphalt airport

src/widgets/airport_widget.h

@@ -29,6 +29,7 @@ enum AirportToolbarWidgets : WidgetID {
 	WID_AT_AIRPORT,                   ///< Build a predefined airport.
 	WID_AT_DEMOLISH,                  ///< Demolish button.
 	WID_AT_CHANGE_GRAPHICS,           ///< Change base graphics, if possible.
+	WID_AT_TOGGLE_GROUND,             ///< Toggle airport ground graphics on a tile.
 
 	WID_AT_REMOVE_FIRST = WID_AT_BUILD_TILE,   ///< First an last widgets that work combined with remove widget.
 	WID_AT_REMOVE_LAST = WID_AT_HANGAR_EXTENDED,