Add fastapi getnetworkinextent

main.py

@@ -1427,8 +1427,9 @@ async def fastapi_get_major_node_coords(network: str, diameter: int) -> list[str
 # DingZQ, 2025-01-03, get network in extent
 @app.get("/getnetworkinextent/")
 async def fastapi_get_network_in_extent(network: str, x1: float, y1: float, x2: float, y2: float) -> dict[str, Any] | None:
-    # TODO
-    pass    
+    nodes = api.get_nodes_in_extent(network, x1, y1, x2, y2)
+    links = api.get_links_in_extent(network, x1, y1, x2, y2)
+    return { 'nodes': nodes, 'links': links }
 
 # DingZQ, 2024-12-08, get all links' start and end node 
 # link_id:link_type:node_id1:node_id2