Add explicit stairs and measure elevator congestion with real actors

scenes/main/world_preview.gd

@@ -3,6 +3,7 @@ extends Control
 
 signal facility_selected(instance_id: StringName)
 signal construction_selected(job_id: StringName)
+signal legacy_stair_selected(stair_id: StringName)
 signal cell_clicked(cell: Vector3i)
 signal hovered_cell_changed(cell: Variant)
 signal build_preview_changed(report: Dictionary)
@@ -320,6 +321,12 @@ func _gui_input(event: InputEvent) -> void:
 		cell_clicked.emit(cell)
 		accept_event()
 		return
+	var stair_id := legacy_stair_at_canvas(event.position)
+	if not stair_id.is_empty():
+		selected_entity_id = stair_id
+		legacy_stair_selected.emit(stair_id)
+		accept_event()
+		return
 	var world: Variant = _service(&"world_service")
 	if world != null and world.has_method(&"get_occupant"):
 		var occupant_id := StringName(world.call(&"get_occupant", cell))
@@ -353,6 +360,7 @@ func _draw() -> void:
 	if show_grid:
 		_draw_congestion_overlay(bounds)
 	_draw_world_entity_icons()
+	_draw_legacy_stairs()
 	_draw_elevators()
 	_draw_construction_labels()
 	_draw_facility_labels()
@@ -537,6 +545,53 @@ func _draw_world_entity_icons() -> void:
 			draw_rect(rect.grow(-p),Color("f5d582"),false,2*p)
 
 
+func get_legacy_stair_records() -> Array[Dictionary]:
+	var result: Array[Dictionary] = []
+	var service: Variant = _service(&"legacy_stairs")
+	if service == null or not service.has_method(&"create_snapshot"):
+		return result
+	var snapshot: Variant = service.call(&"create_snapshot")
+	if not snapshot is Dictionary:
+		return result
+	for row: Variant in snapshot.get(&"stairs", []):
+		if row is Dictionary and row.get(&"from") is Vector3i and row.get(&"to") is Vector3i:
+			var record: Dictionary = row.duplicate(true)
+			var path: Variant = _service(&"path_service")
+			var connector: Dictionary = path.call(&"get_connector", StringName(row[&"id"])) if path != null else {}
+			record[&"access_id"] = connector.get(&"access_id", &"")
+			result.append(record)
+	return result
+
+
+func legacy_stair_at_canvas(canvas_position: Vector2) -> StringName:
+	for stair: Dictionary in get_legacy_stair_records():
+		var upper: Vector3i = stair[&"to"] if stair[&"to"].y > stair[&"from"].y else stair[&"from"]
+		if upper.z == layer_mode and _legacy_stair_rect(upper).has_point(canvas_position):
+			return StringName(stair[&"id"])
+	return &""
+
+
+func _legacy_stair_rect(upper: Vector3i) -> Rect2:
+	var rect := get_cell_rect(upper)
+	# A small target leaves the rest of an existing room available for selection.
+	return Rect2(rect.position+rect.size*Vector2(0.49,0.24), rect.size*Vector2(0.5,0.7))
+
+
+func _draw_legacy_stairs() -> void:
+	for stair: Dictionary in get_legacy_stair_records():
+		var upper: Vector3i = stair[&"to"] if stair[&"to"].y > stair[&"from"].y else stair[&"from"]
+		if upper.z != layer_mode:
+			continue
+		var rect := _legacy_stair_rect(upper)
+		if not rect.intersects(Rect2(Vector2.ZERO, size)):
+			continue
+		var p := rect.size.x/14.0
+		draw_rect(rect, Color("3c4e40",0.5))
+		PixelArt.stairs(self,rect,p,upper.z == LayerMode.BACK,true)
+		if StringName(stair[&"id"]) == selected_entity_id:
+			draw_rect(rect,Color("f5d582"),false,maxf(p,1))
+
+
 func _cell_bounds_rect(cells: Array[Vector3i]) -> Rect2:
 	if cells.is_empty():
 		return Rect2()
@@ -605,7 +660,7 @@ func _draw_facility_labels() -> void:
 		var selected := StringName(facility.get(&"instance_id",&""))==selected_entity_id
 		if not hovered and not selected and rect.size.x<100:
 			continue
-		if id in [&"guest_corridor",&"service_corridor",&"staff_door"] and not hovered and not selected:
+		if id in [&"guest_corridor",&"service_corridor",&"staff_door",&"guest_stairs",&"service_stairs"] and not hovered and not selected:
 			continue
 		var definition: Variant = registry.call(&"get_facility",id) if registry != null else null
 		var label := String(definition.display_name) if definition != null else String(id)