66 lines
2.9 KiB
Python
66 lines
2.9 KiB
Python
from .database import *
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def generate_virtual_district(name: str, centers: list[str]):
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i = 0
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node_index: dict[str, int] = {}
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rows = read_all(name, 'select id from _node')
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for row in rows:
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i += 1
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node_index[str(row['id'])] = i
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write(name, 'drop table if exists vd_graph')
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write(name, 'create table vd_graph (id serial, source integer, target integer, cost numeric)')
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pipes = read_all(name, 'select node1, node2, length from pipes')
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for pipe in pipes:
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source = node_index[str(pipe['node1'])]
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target = node_index[str(pipe['node2'])]
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cost = float(pipe['length'])
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write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, {cost})")
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pumps = read_all(name, 'select node1, node2 from pumps')
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for pump in pumps:
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source = node_index[str(pump['node1'])]
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target = node_index[str(pump['node2'])]
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write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, 0.0)")
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valves = read_all(name, 'select node1, node2 from valves')
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for valve in valves:
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source = node_index[str(valve['node1'])]
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target = node_index[str(valve['node2'])]
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write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, 0.0)")
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node_distance: dict[str, dict[str, Any]] = {}
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for center in centers:
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for node, index in node_index.items():
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if node == center:
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continue
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# TODO: check none
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distance = float(read(name, f"select max(agg_cost) as distance from pgr_dijkstraCost('select id, source, target, cost from vd_graph', {index}, {node_index[center]}, false)")['distance'])
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if node not in node_distance:
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node_distance[node] = { 'center': center, 'distance' : distance }
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elif distance < node_distance[node]['distance']:
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node_distance[node] = { 'center': center, 'distance' : distance }
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write(name, 'drop table vd_graph')
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center_node: dict[str, list[str]] = {}
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for node, value in node_distance.items():
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if value['center'] not in center_node:
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center_node[value['center']] = []
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center_node[value['center']].append(node)
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write(name, 'delete from virtual_district')
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for center, value in center_node.items():
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write(name, f'drop table if exists vd_{center}')
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write(name, f'create table vd_{center} (node varchar(32) primary key references _node(id))')
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for node in value:
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write(name, f"insert into vd_{center} values ('{node}')")
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# TODO: check none
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boundary = read(name, f'select st_astext(st_convexhull(st_collect(array(select coord from coordinates where node in (select * from vd_{center}))))) as boundary' )['boundary']
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write(name, f"insert into virtual_district (id, center, boundary) values ('vd_{center}', '{center}', st_geomfromtext('{boundary}'))")
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write(name, f'drop table vd_{center}')
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