Animate ship crafter deliveries

GameState.gd

@@ -308,6 +308,11 @@ var next_building_id: int = 1
 # Production is simulated here, in the autoload, the same way extractor
 # haulers are, so a build finishes whether or not the player is in space.
 var stored_vessels: Array = []
+# Finished crafter orders travel to the mothership before appearing in its
+# hangar. State is authoritative here so delivery continues off-screen.
+# {"type", "from", "to", "progress"}
+var vessel_deliveries: Array = []
+const VESSEL_DELIVERY_SPEED: float = 950.0
 
 signal order_completed(building_id: int, type: String)
 
@@ -695,9 +700,15 @@ func _advance_production(delta: float) -> void:
 			# hub and wait for work (#19).
 			_station_transporter(b.position)
 		else:
-			# Everything else is delivered to the mothership and waits there
-			# until the player crews it (#23).
-			stored_vessels.append(product)
+			# A finished hull launches from the crafter and physically flies to
+			# the mothership hangar. With no mothership there is nowhere to fly,
+			# so preserve the old safe fallback of holding it immediately.
+			var mothership: Variant = get_mothership_position()
+			if mothership == null:
+				stored_vessels.append(product)
+			else:
+				vessel_deliveries.append({"type": product, "from": b.position,
+					"to": mothership, "progress": 0.0})
 		order_completed.emit(int(b.id), product)
 
 
@@ -818,6 +829,7 @@ func _process(delta: float) -> void:
 	# Runs in the autoload, so mining and transport continue while the player
 	# is on a planet's surface or nowhere near either.
 	_advance_production(delta)
+	_advance_vessel_deliveries(delta)
 	for e in extractors:
 		e.mining_progress = float(e.get("mining_progress", 0.0)) + delta * EXTRACTOR_RATE
 		var whole: int = int(floor(float(e.mining_progress)))
@@ -827,6 +839,21 @@ func _process(delta: float) -> void:
 	_advance_transporters(delta)
 
 
+func vessel_delivery_position(delivery: Dictionary) -> Vector2:
+	return (delivery.from as Vector2).lerp(delivery.to as Vector2,
+		clampf(float(delivery.progress), 0.0, 1.0))
+
+
+func _advance_vessel_deliveries(delta: float) -> void:
+	for i in range(vessel_deliveries.size() - 1, -1, -1):
+		var delivery: Dictionary = vessel_deliveries[i]
+		var distance: float = (delivery.from as Vector2).distance_to(delivery.to as Vector2)
+		delivery.progress = float(delivery.progress) + delta / maxf(distance / VESSEL_DELIVERY_SPEED, 0.001)
+		if float(delivery.progress) >= 1.0:
+			stored_vessels.append(String(delivery.type))
+			vessel_deliveries.remove_at(i)
+
+
 # --- transporters (#19) ---------------------------------------------------
 
 # Vessels stationed at a transport hub that fetch ore from the mothership and