(svn r26849) -Fix[FS#6113]: Better display of refit information in articulated vehicles.

src/articulated_vehicles.cpp

@@ -162,6 +162,41 @@ CargoArray GetCapacityOfArticulatedParts(EngineID engine)
 	return capacity;
 }
 
+/**
+ * Get the default cargoes and refits of an articulated vehicle.
+ * The refits are linked to a cargo rather than an articulated part to prevent a long list of parts.
+ * @param engine Model to investigate.
+ * @param[out] cargoes Total amount of units that can be transported, summed by cargo.
+ * @param[out] refits Whether a (possibly partial) refit for each cargo is possible.
+ */
+void GetArticulatedVehicleCargoesAndRefits(EngineID engine, CargoArray *cargoes, uint32 *refits)
+{
+	cargoes->Clear();
+	*refits = 0;
+
+	const Engine *e = Engine::Get(engine);
+
+	CargoID cargo_type;
+	uint16 cargo_capacity = GetVehicleDefaultCapacity(engine, &cargo_type);
+	if (cargo_type < NUM_CARGO && cargo_capacity > 0) {
+		(*cargoes)[cargo_type] += cargo_capacity;
+		if (IsEngineRefittable(engine)) SetBit(*refits, cargo_type);
+	}
+
+	if (!e->IsGroundVehicle() || !HasBit(e->info.callback_mask, CBM_VEHICLE_ARTIC_ENGINE)) return;
+
+	for (uint i = 1; i < MAX_ARTICULATED_PARTS; i++) {
+		EngineID artic_engine = GetNextArticulatedPart(i, engine);
+		if (artic_engine == INVALID_ENGINE) break;
+
+		cargo_capacity = GetVehicleDefaultCapacity(artic_engine, &cargo_type);
+		if (cargo_type < NUM_CARGO && cargo_capacity > 0) {
+			(*cargoes)[cargo_type] += cargo_capacity;
+			if (IsEngineRefittable(artic_engine)) SetBit(*refits, cargo_type);
+		}
+	}
+}
+
 /**
  * Checks whether any of the articulated parts is refittable
  * @param engine the first part

src/build_vehicle_gui.cpp

@@ -532,21 +532,20 @@ static GUIEngineList::FilterFunction * const _filter_funcs[] = {
 	&CargoFilter,
 };
 
-static int DrawCargoCapacityInfo(int left, int right, int y, EngineID engine, bool refittable)
+static int DrawCargoCapacityInfo(int left, int right, int y, EngineID engine)
 {
-	CargoArray cap = GetCapacityOfArticulatedParts(engine);
+	CargoArray cap;
+	uint32 refits;
+	GetArticulatedVehicleCargoesAndRefits(engine, &cap, &refits);
 
 	for (CargoID c = 0; c < NUM_CARGO; c++) {
 		if (cap[c] == 0) continue;
 
 		SetDParam(0, c);
 		SetDParam(1, cap[c]);
-		SetDParam(2, refittable ? STR_PURCHASE_INFO_REFITTABLE : STR_EMPTY);
+		SetDParam(2, HasBit(refits, c) ? STR_PURCHASE_INFO_REFITTABLE : STR_EMPTY);
 		DrawString(left, right, y, STR_PURCHASE_INFO_CAPACITY);
 		y += FONT_HEIGHT_NORMAL;
-
-		/* Only show as refittable once */
-		refittable = false;
 	}
 
 	return y;
@@ -831,7 +830,7 @@ int DrawVehiclePurchaseInfo(int left, int right, int y, EngineID engine_number)
 
 	if (articulated_cargo) {
 		/* Cargo type + capacity, or N/A */
-		int new_y = DrawCargoCapacityInfo(left, right, y, engine_number, refittable);
+		int new_y = DrawCargoCapacityInfo(left, right, y, engine_number);
 
 		if (new_y == y) {
 			SetDParam(0, CT_INVALID);

src/engine_func.h

@@ -26,6 +26,7 @@ extern const uint8 _engine_offsets[4];
 
 bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company);
 bool IsEngineRefittable(EngineID engine);
+void GetArticulatedVehicleCargoesAndRefits(EngineID engine, CargoArray *cargoes, uint32 *refits);
 void SetYearEngineAgingStops();
 void StartupOneEngine(Engine *e, Date aging_date);