(svn r15676) -Codechange: remove the need for BeginVehicleMove and merge VehiclePositionChanged and EndVehicleMove.

src/aircraft_cmd.cpp

@@ -397,8 +397,8 @@ CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 
 		UpdateAircraftCache(v);
 
-		VehiclePositionChanged(v);
+		VehicleMove(v, false);
-		VehiclePositionChanged(u);
+		VehicleMove(u, false);
 
 		/* Aircraft with 3 vehicles (chopper)? */
 		if (v->subtype == AIR_HELICOPTER) {
@@ -421,7 +421,7 @@ CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 			w->UpdateDeltaXY(INVALID_DIR);
 
 			u->SetNext(w);
-			VehiclePositionChanged(w);
+			VehicleMove(w, false);
 		}
 
 		InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
@@ -692,9 +692,7 @@ static void HelicopterTickHandler(Vehicle *v)
 
 	u->cur_image = img;
 
-	BeginVehicleMove(u);
+	VehicleMove(u, true);
-	VehiclePositionChanged(u);
-	EndVehicleMove(u);
 }
 
 void SetAircraftPosition(Vehicle *v, int x, int y, int z)
@@ -706,9 +704,7 @@ void SetAircraftPosition(Vehicle *v, int x, int y, int z)
 	v->cur_image = v->GetImage(v->direction);
 	if (v->subtype == AIR_HELICOPTER) v->Next()->Next()->cur_image = GetRotorImage(v);
 
-	BeginVehicleMove(v);
+	VehicleMove(v, true);
-	VehiclePositionChanged(v);
-	EndVehicleMove(v);
 
 	Vehicle *u = v->Next();
 
@@ -721,9 +717,7 @@ void SetAircraftPosition(Vehicle *v, int x, int y, int z)
 	u->z_pos = GetSlopeZ(safe_x, safe_y);
 	u->cur_image = v->cur_image;
 
-	BeginVehicleMove(u);
+	VehicleMove(u, true);
-	VehiclePositionChanged(u);
-	EndVehicleMove(u);
 
 	u = u->Next();
 	if (u != NULL) {
@@ -731,9 +725,7 @@ void SetAircraftPosition(Vehicle *v, int x, int y, int z)
 		u->y_pos = y;
 		u->z_pos = z + 5;
 
-		BeginVehicleMove(u);
+		VehicleMove(u, true);
-		VehiclePositionChanged(u);
-		EndVehicleMove(u);
 	}
 }
 

src/articulated_vehicles.cpp

@@ -329,6 +329,6 @@ void AddArticulatedParts(Vehicle **vl, VehicleType type)
 
 		if (flip_image) u->spritenum++;
 
-		VehiclePositionChanged(u);
+		VehicleMove(u, false);
 	}
 }

src/disaster_cmd.cpp

@@ -135,7 +135,7 @@ static void InitializeDisasterVehicle(Vehicle *v, int x, int y, byte z, Directio
 	v->current_order.Free();
 
 	DisasterVehicleUpdateImage(v);
-	VehiclePositionChanged(v);
+	VehicleMove(v, false);
 	MarkSingleVehicleDirty(v);
 }
 
@@ -143,20 +143,17 @@ static void SetDisasterVehiclePos(Vehicle *v, int x, int y, byte z)
 {
 	Vehicle *u;
 
-	BeginVehicleMove(v);
 	v->x_pos = x;
 	v->y_pos = y;
 	v->z_pos = z;
 	v->tile = TileVirtXY(x, y);
 
 	DisasterVehicleUpdateImage(v);
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	EndVehicleMove(v);
 
 	if ((u = v->Next()) != NULL) {
 		int safe_x = Clamp(x, 0, MapMaxX() * TILE_SIZE);
 		int safe_y = Clamp(y - 1, 0, MapMaxY() * TILE_SIZE);
-		BeginVehicleMove(u);
 
 		u->x_pos = x;
 		u->y_pos = y - 1 - (max(z - GetSlopeZ(safe_x, safe_y), 0U) >> 3);
@@ -165,16 +162,13 @@ static void SetDisasterVehiclePos(Vehicle *v, int x, int y, byte z)
 		u->direction = v->direction;
 
 		DisasterVehicleUpdateImage(u);
-		VehiclePositionChanged(u);
+		VehicleMove(u, true);
-		EndVehicleMove(u);
 
 		if ((u = u->Next()) != NULL) {
-			BeginVehicleMove(u);
 			u->x_pos = x;
 			u->y_pos = y;
 			u->z_pos = z + 5;
-			VehiclePositionChanged(u);
+			VehicleMove(u, true);
-			EndVehicleMove(u);
 		}
 	}
 }
@@ -543,8 +537,7 @@ static void DisasterTick_Helicopter_Rotors(Vehicle *v)
 
 	if (++v->cur_image > SPR_ROTOR_MOVING_3) v->cur_image = SPR_ROTOR_MOVING_1;
 
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	MarkSingleVehicleDirty(v);
 }
 
 /**
@@ -702,8 +695,6 @@ static void DisasterTick_Submarine(Vehicle *v)
 	v->tick_counter++;
 
 	if (++v->age > 8880) {
-		VehiclePositionChanged(v);
-		MarkSingleVehicleDirty(v);
 		delete v;
 		return;
 	}

src/effectvehicle.cpp

@@ -25,8 +25,6 @@ static void ChimneySmokeTick(Vehicle *v)
 	if (v->progress > 0) {
 		v->progress--;
 	} else {
-		BeginVehicleMove(v);
-
 		TileIndex tile = TileVirtXY(v->x_pos, v->y_pos);
 		if (!IsTileType(tile, MP_INDUSTRY)) {
 			delete v;
@@ -39,8 +37,7 @@ static void ChimneySmokeTick(Vehicle *v)
 			v->cur_image = SPR_CHIMNEY_SMOKE_0;
 		}
 		v->progress = 7;
-		VehiclePositionChanged(v);
+		VehicleMove(v, true);
-		EndVehicleMove(v);
 	}
 }
 
@@ -54,8 +51,6 @@ static void SteamSmokeTick(Vehicle *v)
 {
 	bool moved = false;
 
-	BeginVehicleMove(v);
-
 	v->progress++;
 
 	if ((v->progress & 7) == 0) {
@@ -73,10 +68,7 @@ static void SteamSmokeTick(Vehicle *v)
 		moved = true;
 	}
 
-	if (moved) {
+	if (moved) VehicleMove(v, true);
-		VehiclePositionChanged(v);
-		EndVehicleMove(v);
-	}
 }
 
 static void DieselSmokeInit(Vehicle *v)
@@ -90,16 +82,12 @@ static void DieselSmokeTick(Vehicle *v)
 	v->progress++;
 
 	if ((v->progress & 3) == 0) {
-		BeginVehicleMove(v);
 		v->z_pos++;
-		VehiclePositionChanged(v);
+		VehicleMove(v, true);
-		EndVehicleMove(v);
 	} else if ((v->progress & 7) == 1) {
-		BeginVehicleMove(v);
 		if (v->cur_image != SPR_DIESEL_SMOKE_5) {
 			v->cur_image++;
-			VehiclePositionChanged(v);
+			VehicleMove(v, true);
-			EndVehicleMove(v);
 		} else {
 			delete v;
 		}
@@ -118,11 +106,9 @@ static void ElectricSparkTick(Vehicle *v)
 		v->progress++;
 	} else {
 		v->progress = 0;
-		BeginVehicleMove(v);
 		if (v->cur_image != SPR_ELECTRIC_SPARK_5) {
 			v->cur_image++;
-			VehiclePositionChanged(v);
+			VehicleMove(v, true);
-			EndVehicleMove(v);
 		} else {
 			delete v;
 		}
@@ -139,8 +125,6 @@ static void SmokeTick(Vehicle *v)
 {
 	bool moved = false;
 
-	BeginVehicleMove(v);
-
 	v->progress++;
 
 	if ((v->progress & 3) == 0) {
@@ -158,10 +142,7 @@ static void SmokeTick(Vehicle *v)
 		moved = true;
 	}
 
-	if (moved) {
+	if (moved) VehicleMove(v, true);
-		VehiclePositionChanged(v);
-		EndVehicleMove(v);
-	}
 }
 
 static void ExplosionLargeInit(Vehicle *v)
@@ -174,11 +155,9 @@ static void ExplosionLargeTick(Vehicle *v)
 {
 	v->progress++;
 	if ((v->progress & 3) == 0) {
-		BeginVehicleMove(v);
 		if (v->cur_image != SPR_EXPLOSION_LARGE_F) {
 			v->cur_image++;
-			VehiclePositionChanged(v);
+			VehicleMove(v, true);
-			EndVehicleMove(v);
 		} else {
 			delete v;
 		}
@@ -195,14 +174,12 @@ static void BreakdownSmokeTick(Vehicle *v)
 {
 	v->progress++;
 	if ((v->progress & 7) == 0) {
-		BeginVehicleMove(v);
 		if (v->cur_image != SPR_BREAKDOWN_SMOKE_3) {
 			v->cur_image++;
 		} else {
 			v->cur_image = SPR_BREAKDOWN_SMOKE_0;
 		}
-		VehiclePositionChanged(v);
+		VehicleMove(v, true);
-		EndVehicleMove(v);
 	}
 
 	v->u.effect.animation_state--;
@@ -221,11 +198,9 @@ static void ExplosionSmallTick(Vehicle *v)
 {
 	v->progress++;
 	if ((v->progress & 3) == 0) {
-		BeginVehicleMove(v);
 		if (v->cur_image != SPR_EXPLOSION_SMALL_B) {
 			v->cur_image++;
-			VehiclePositionChanged(v);
+			VehicleMove(v, true);
-			EndVehicleMove(v);
 		} else {
 			delete v;
 		}
@@ -285,8 +260,6 @@ static void BulldozerTick(Vehicle *v)
 	if ((v->progress & 7) == 0) {
 		const BulldozerMovement *b = &_bulldozer_movement[v->u.effect.animation_state];
 
-		BeginVehicleMove(v);
-
 		v->cur_image = SPR_BULLDOZER_NE + b->image;
 
 		v->x_pos += _inc_by_dir[b->direction].x;
@@ -301,8 +274,7 @@ static void BulldozerTick(Vehicle *v)
 				return;
 			}
 		}
-		VehiclePositionChanged(v);
+		VehicleMove(v, true);
-		EndVehicleMove(v);
 	}
 }
 
@@ -470,13 +442,10 @@ static void BubbleTick(Vehicle *v)
 	v->progress++;
 	if ((v->progress & 3) != 0) return;
 
-	BeginVehicleMove(v);
-
 	if (v->spritenum == 0) {
 		v->cur_image++;
 		if (v->cur_image < SPR_BUBBLE_GENERATE_3) {
-			VehiclePositionChanged(v);
+			VehicleMove(v, true);
-			EndVehicleMove(v);
 			return;
 		}
 		if (v->u.effect.animation_substate != 0) {
@@ -522,8 +491,7 @@ static void BubbleTick(Vehicle *v)
 	v->z_pos += b->z;
 	v->cur_image = SPR_BUBBLE_0 + b->image;
 
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	EndVehicleMove(v);
 }
 
 
@@ -572,9 +540,8 @@ Vehicle *CreateEffectVehicle(int x, int y, int z, EffectVehicleType type)
 
 	_effect_init_procs[type](v);
 
-	VehiclePositionChanged(v);
+	VehicleMove(v, false);
-	BeginVehicleMove(v);
+	MarkSingleVehicleDirty(v);
-	EndVehicleMove(v);
 
 	return v;
 }

src/roadveh_cmd.cpp

@@ -270,7 +270,7 @@ CommandCost CmdBuildRoadVeh(TileIndex tile, DoCommandFlag flags, uint32 p1, uint
 			if (u->cargo_cap != 0) u->cargo_cap = GetVehicleProperty(u, 0x0F, u->cargo_cap);
 		}
 
-		VehiclePositionChanged(v);
+		VehicleMove(v, false);
 
 		InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
 		InvalidateWindowClassesData(WC_ROADVEH_LIST, 0);
@@ -540,8 +540,7 @@ static byte SetRoadVehPosition(Vehicle *v, int x, int y)
 	old_z = v->z_pos;
 	v->z_pos = new_z;
 
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	EndVehicleMove(v);
 	return old_z;
 }
 
@@ -555,7 +554,6 @@ static void RoadVehSetRandomDirection(Vehicle *v)
 		uint32 r = Random();
 
 		v->direction = ChangeDir(v->direction, delta[r & 3]);
-		BeginVehicleMove(v);
 		v->UpdateDeltaXY(v->direction);
 		v->cur_image = v->GetImage(v->direction);
 		SetRoadVehPosition(v, v->x_pos, v->y_pos);
@@ -1246,8 +1244,6 @@ static bool RoadVehLeaveDepot(Vehicle *v, bool first)
 		v->cur_speed = 0;
 	}
 
-	BeginVehicleMove(v);
-
 	v->vehstatus &= ~VS_HIDDEN;
 	v->u.road.state = tdir;
 	v->u.road.frame = RVC_DEPOT_START_FRAME;
@@ -1367,9 +1363,6 @@ static bool IndividualRoadVehicleController(Vehicle *v, const Vehicle *prev)
 	 * by the previous vehicle in the chain when it gets to the right place. */
 	if (v->IsInDepot()) return true;
 
-	/* Save old vehicle position to use at end of move to set viewport area dirty */
-	BeginVehicleMove(v);
-
 	if (v->u.road.state == RVSB_WORMHOLE) {
 		/* Vehicle is entering a depot or is on a bridge or in a tunnel */
 		GetNewVehiclePosResult gp = GetNewVehiclePos(v);
@@ -1392,8 +1385,7 @@ static bool IndividualRoadVehicleController(Vehicle *v, const Vehicle *prev)
 
 		v->x_pos = gp.x;
 		v->y_pos = gp.y;
-		VehiclePositionChanged(v);
+		VehicleMove(v, !(v->vehstatus & VS_HIDDEN));
-		if (!(v->vehstatus & VS_HIDDEN)) EndVehicleMove(v);
 		return true;
 	}
 

src/saveload/vehicle_sl.cpp

@@ -359,8 +359,7 @@ void AfterLoadVehicles(bool part_of_load)
 			default: break;
 		}
 
-		v->coord.left = INVALID_COORD;
+		VehicleMove(v, false);
-		VehiclePositionChanged(v);
 	}
 }
 

src/ship_cmd.cpp

@@ -588,8 +588,6 @@ static void ShipController(Vehicle *v)
 
 	if (!ShipAccelerate(v)) return;
 
-	BeginVehicleMove(v);
-
 	GetNewVehiclePosResult gp = GetNewVehiclePos(v);
 	if (v->u.ship.state != TRACK_BIT_WORMHOLE) {
 		/* Not on a bridge */
@@ -683,8 +681,7 @@ static void ShipController(Vehicle *v)
 		if (!IsTileType(gp.new_tile, MP_TUNNELBRIDGE) || !HasBit(VehicleEnterTile(v, gp.new_tile, gp.x, gp.y), VETS_ENTERED_WORMHOLE)) {
 			v->x_pos = gp.x;
 			v->y_pos = gp.y;
-			VehiclePositionChanged(v);
+			VehicleMove(v, !(v->vehstatus & VS_HIDDEN));
-			if (!(v->vehstatus & VS_HIDDEN)) EndVehicleMove(v);
 			return;
 		}
 	}
@@ -698,8 +695,7 @@ static void ShipController(Vehicle *v)
 getout:
 	v->UpdateDeltaXY(dir);
 	v->cur_image = v->GetImage(dir);
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	EndVehicleMove(v);
 	return;
 
 reverse_direction:
@@ -803,7 +799,7 @@ CommandCost CmdBuildShip(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 
 		v->cargo_cap = GetVehicleProperty(v, 0x0D, svi->capacity);
 
-		VehiclePositionChanged(v);
+		VehicleMove(v, false);
 
 		InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
 		InvalidateWindowClassesData(WC_SHIPS_LIST, 0);

src/train_cmd.cpp

@@ -669,7 +669,7 @@ static CommandCost CmdBuildRailWagon(EngineID engine, TileIndex tile, DoCommandF
 
 		_new_vehicle_id = v->index;
 
-		VehiclePositionChanged(v);
+		VehicleMove(v, false);
 		TrainConsistChanged(v->First(), false);
 		UpdateTrainGroupID(v->First());
 
@@ -724,7 +724,7 @@ static void AddRearEngineToMultiheadedTrain(Vehicle *v, Vehicle *u, bool buildin
 	u->value = v->value;
 	u->cur_image = 0xAC2;
 	u->random_bits = VehicleRandomBits();
-	VehiclePositionChanged(u);
+	VehicleMove(u, false);
 }
 
 /** Build a railroad vehicle.
@@ -827,7 +827,7 @@ CommandCost CmdBuildRailVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1,
 		SetFrontEngine(v);
 		SetTrainEngine(v);
 
-		VehiclePositionChanged(v);
+		VehicleMove(v, false);
 
 		if (rvi->railveh_type == RAILVEH_MULTIHEAD) {
 			SetMultiheaded(v);
@@ -1546,9 +1546,7 @@ static void UpdateVarsAfterSwap(Vehicle *v)
 {
 	v->UpdateDeltaXY(v->direction);
 	v->cur_image = v->GetImage(v->direction);
-	BeginVehicleMove(v);
+	VehicleMove(v, true);
-	VehiclePositionChanged(v);
-	EndVehicleMove(v);
 }
 
 static inline void SetLastSpeed(Vehicle *v, int spd)
@@ -2420,7 +2418,7 @@ static bool CheckTrainStayInDepot(Vehicle *v)
 
 	v->UpdateDeltaXY(v->direction);
 	v->cur_image = v->GetImage(v->direction);
-	VehiclePositionChanged(v);
+	VehicleMove(v, false);
 	UpdateSignalsOnSegment(v->tile, INVALID_DIAGDIR, v->owner);
 	UpdateTrainAcceleration(v);
 	InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
@@ -3366,8 +3364,7 @@ static byte AfterSetTrainPos(Vehicle *v, bool new_tile)
 		}
 	}
 
-	VehiclePositionChanged(v);
+	VehicleMove(v, true);
-	EndVehicleMove(v);
 	return old_z;
 }
 
@@ -3650,7 +3647,6 @@ static void TrainController(Vehicle *v, Vehicle *nomove, bool update_image)
 	for (prev = v->Previous(); v != nomove; prev = v, v = v->Next()) {
 		DiagDirection enterdir = DIAGDIR_BEGIN;
 		bool update_signals_crossing = false; // will we update signals or crossing state?
-		BeginVehicleMove(v);
 
 		GetNewVehiclePosResult gp = GetNewVehiclePos(v);
 		if (v->u.rail.track != TRACK_BIT_WORMHOLE) {
@@ -3838,8 +3834,7 @@ static void TrainController(Vehicle *v, Vehicle *nomove, bool update_image)
 			} else {
 				v->x_pos = gp.x;
 				v->y_pos = gp.y;
-				VehiclePositionChanged(v);
+				VehicleMove(v, !(v->vehstatus & VS_HIDDEN));
-				if (!(v->vehstatus & VS_HIDDEN)) EndVehicleMove(v);
 				continue;
 			}
 		}
@@ -4002,7 +3997,6 @@ static void ChangeTrainDirRandomly(Vehicle *v)
 		/* We don't need to twist around vehicles if they're not visible */
 		if (!(v->vehstatus & VS_HIDDEN)) {
 			v->direction = ChangeDir(v->direction, delta[GB(Random(), 0, 2)]);
-			BeginVehicleMove(v);
 			v->UpdateDeltaXY(v->direction);
 			v->cur_image = v->GetImage(v->direction);
 			/* Refrain from updating the z position of the vehicle when on

src/vehicle.cpp

@@ -186,23 +186,6 @@ bool HasVehicleOnTunnelBridge(TileIndex tile, TileIndex endtile, const Vehicle *
 
 static void UpdateVehiclePosHash(Vehicle *v, int x, int y);
 
-void VehiclePositionChanged(Vehicle *v)
-{
-	int img = v->cur_image;
-	Point pt = RemapCoords(v->x_pos + v->x_offs, v->y_pos + v->y_offs, v->z_pos);
-	const Sprite *spr = GetSprite(img, ST_NORMAL);
-
-	pt.x += spr->x_offs;
-	pt.y += spr->y_offs;
-
-	UpdateVehiclePosHash(v, pt.x, pt.y);
-
-	v->coord.left = pt.x;
-	v->coord.top = pt.y;
-	v->coord.right = pt.x + spr->width + 2;
-	v->coord.bottom = pt.y + spr->height + 2;
-}
-
 Vehicle::Vehicle()
 {
 	this->type               = VEH_INVALID;
@@ -1631,34 +1614,39 @@ CommandCost CmdChangeServiceInt(TileIndex tile, DoCommandFlag flags, uint32 p1,
 }
 
 
-static Rect _old_vehicle_coords; ///< coords of vehicle before it has moved
-
 /**
- * Stores the vehicle image coords for later call to EndVehicleMove()
+ * Move a vehicle in the game state; that is moving it's position in
- * @param v vehicle which image's coords to store
+ * the position hashes and marking it's location in the viewport dirty
- * @see _old_vehicle_coords
+ * if requested.
- * @see EndVehicleMove()
+ * @param v vehicle to move
+ * @param update_viewport whether to dirty the viewport
  */
-void BeginVehicleMove(const Vehicle *v)
+void VehicleMove(Vehicle *v, bool update_viewport)
 {
-	_old_vehicle_coords = v->coord;
+	int img = v->cur_image;
-}
+	Point pt = RemapCoords(v->x_pos + v->x_offs, v->y_pos + v->y_offs, v->z_pos);
+	const Sprite *spr = GetSprite(img, ST_NORMAL);
 
-/**
+	pt.x += spr->x_offs;
- * Marks screen dirty after a vehicle has moved
+	pt.y += spr->y_offs;
- * @param v vehicle which is marked dirty
+
- * @see _old_vehicle_coords
+	UpdateVehiclePosHash(v, pt.x, pt.y);
- * @see BeginVehicleMove()
+
- */
+	Rect old_coord = v->coord;
-void EndVehicleMove(const Vehicle *v)
+	v->coord.left   = pt.x;
-{
+	v->coord.top    = pt.y;
+	v->coord.right  = pt.x + spr->width + 2;
+	v->coord.bottom = pt.y + spr->height + 2;
+
+	if (update_viewport) {
 		MarkAllViewportsDirty(
-		min(_old_vehicle_coords.left,   v->coord.left),
+			min(old_coord.left,   v->coord.left),
-		min(_old_vehicle_coords.top,    v->coord.top),
+			min(old_coord.top,    v->coord.top),
-		max(_old_vehicle_coords.right,  v->coord.right) + 1,
+			max(old_coord.right,  v->coord.right) + 1,
-		max(_old_vehicle_coords.bottom, v->coord.bottom) + 1
+			max(old_coord.bottom, v->coord.bottom) + 1
 		);
 	}
+}
 
 /**
  * Marks viewports dirty where the vehicle's image is

src/vehicle_func.h

@@ -22,7 +22,6 @@
 typedef Vehicle *VehicleFromPosProc(Vehicle *v, void *data);
 
 void VehicleServiceInDepot(Vehicle *v);
-void VehiclePositionChanged(Vehicle *v);
 Vehicle *GetLastVehicleInChain(Vehicle *v);
 const Vehicle *GetLastVehicleInChain(const Vehicle *v);
 uint CountVehiclesInChain(const Vehicle *v);
@@ -55,8 +54,7 @@ void CheckVehicleBreakdown(Vehicle *v);
 void AgeVehicle(Vehicle *v);
 void VehicleEnteredDepotThisTick(Vehicle *v);
 
-void BeginVehicleMove(const Vehicle *v);
+void VehicleMove(Vehicle *v, bool update_viewport);
-void EndVehicleMove(const Vehicle *v);
 void MarkSingleVehicleDirty(const Vehicle *v);
 
 UnitID GetFreeUnitNumber(VehicleType type);