Support more region utils, such as convex hull

api/__init__.py

@@ -132,6 +132,8 @@ from .s31_scada_element import SCADA_ELEMENT_STATUS_OFFLINE, SCADA_ELEMENT_STATU
 from .s31_scada_element import get_scada_element_schema, get_scada_elements, get_scada_element, set_scada_element, add_scada_element, delete_scada_element
 from .clean_api import clean_scada_element
 
+from .s32_region_util import get_nodes_in_boundary, get_nodes_in_region, calculate_convex_hull
+
 from .s33_region import get_region_schema, get_region, set_region, add_region, delete_region
 
 from .s37_virtual_district import calculate_virtual_district

api/s32_region_util.py

@@ -1,3 +1,4 @@
+from .database import read, read_all, write
 
 def from_postgis_polygon(polygon: str) -> list[tuple[float, float]]:
     boundary = polygon.lower().removeprefix('polygon((').removesuffix('))').split(',')
@@ -13,3 +14,36 @@ def to_postgis_polygon(boundary: list[tuple[float, float]]) -> str:
     for pt in boundary:
         polygon += f'{pt[0]} {pt[1]},'
     return f'polygon(({polygon[:-1]}))'
+
+
+def get_nodes_in_boundary(name: str, boundary: list[tuple[float, float]]) -> list[str]:
+    api = 'get_nodes_in_boundary'
+    write(name, f"delete from temp_region where id = '{api}'")
+    write(name, f"insert into temp_region (id, boundary) values ('{api}', '{to_postgis_polygon(boundary)}')")
+
+    nodes: list[str] = []
+    for row in read_all(name, f"select c.node from coordinates as c, temp_region as r where ST_Intersects(c.coord, r.boundary) and r.id = '{api}'"):
+        nodes.append(row['node'])
+
+    write(name, f"delete from temp_region where id = '{api}'")
+
+    return nodes
+
+
+def get_nodes_in_region(name: str, id: str) -> list[str]:
+    nodes: list[str] = []
+    for row in read_all(name, f"select c.node from coordinates as c, region as r where ST_Intersects(c.coord, r.boundary) and r.id = '{id}'"):
+        nodes.append(row['node'])
+    return nodes
+
+
+def calculate_convex_hull(name: str, nodes: list[str]) -> list[tuple[float, float]]:
+    write(name, f'delete from temp_node')
+    for node in nodes:
+        write(name, f"insert into temp_node values ('{node}')")
+
+    # TODO: check none
+    polygon = read(name, f'select st_astext(st_convexhull(st_collect(array(select coord from coordinates where node in (select * from temp_node))))) as boundary' )['boundary']
+    write(name, f'delete from temp_node')
+
+    return from_postgis_polygon(polygon)

api/s37_virtual_district.py

@@ -1,19 +1,10 @@
 from .database import *
 from .s0_base import get_node_links
-
-
-def _polygon_to_nodes(polygon: str) -> list[tuple[float, float]]:
-    boundary = polygon.removeprefix('POLYGON((').removesuffix('))').split(',')
-    xys = []
-    for pt in boundary:
-        xy = pt.split(' ')
-        xys.append((float(xy[0]), float(xy[1])))
-    return xys
+from .s32_region_util import calculate_convex_hull
 
 
 def calculate_virtual_district(name: str, centers: list[str]) -> dict[str, Any]:
-    write(name, 'drop table if exists vd_graph')
-    write(name, 'create table vd_graph (id serial, source integer, target integer, cost numeric)')
+    write(name, 'delete from temp_vd_topology')
 
     # map node name to index
     i = 0
@@ -33,17 +24,17 @@ def calculate_virtual_district(name: str, centers: list[str]) -> dict[str, Any]:
         source = node_index[str(pipe['node1'])]
         target = node_index[str(pipe['node2'])]
         cost = float(pipe['length'])
-        write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, {cost})")
+        write(name, f"insert into temp_vd_topology (source, target, cost) values ({source}, {target}, {cost})")
     pumps = read_all(name, 'select node1, node2 from pumps')
     for pump in pumps:
         source = node_index[str(pump['node1'])]
         target = node_index[str(pump['node2'])]
-        write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, 0.0)")
+        write(name, f"insert into temp_vd_topology (source, target, cost) values ({source}, {target}, 0.0)")
     valves = read_all(name, 'select node1, node2 from valves')
     for valve in valves:
         source = node_index[str(valve['node1'])]
         target = node_index[str(valve['node2'])]
-        write(name, f"insert into vd_graph (source, target, cost) values ({source}, {target}, 0.0)")
+        write(name, f"insert into temp_vd_topology (source, target, cost) values ({source}, {target}, 0.0)")
 
     # dijkstra distance
     node_distance: dict[str, dict[str, Any]] = {}
@@ -52,14 +43,13 @@ def calculate_virtual_district(name: str, centers: list[str]) -> dict[str, Any]:
             if node == center:
                 continue
             # TODO: check none
-            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'])
+            distance = float(read(name, f"select max(agg_cost) as distance from pgr_dijkstraCost('select id, source, target, cost from temp_vd_topology', {index}, {node_index[center]}, false)")['distance'])
             if node not in node_distance:
                 node_distance[node] = { 'center': center, 'distance' : distance }
             elif distance < node_distance[node]['distance']:
                 node_distance[node] = { 'center': center, 'distance' : distance }
 
-    # destroy topology graph
-    write(name, 'drop table vd_graph')
+    write(name, 'delete from temp_vd_topology')
 
     # reorganize the distance result
     center_node: dict[str, list[str]] = {}
@@ -71,17 +61,7 @@ def calculate_virtual_district(name: str, centers: list[str]) -> dict[str, Any]:
     vds: list[dict[str, Any]] = []
 
     for center, value in center_node.items():
-        write(name, f'drop table if exists vd_{center}')
-        write(name, f'create table vd_{center} (node varchar(32) primary key references _node(id))')
-
-        for node in value:
-            write(name, f"insert into vd_{center} values ('{node}')")
-
-        # TODO: check none
-        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']
-        xys = _polygon_to_nodes(boundary)
+        xys = calculate_convex_hull(name, value)
         vds.append({ 'center': center, 'nodes': value, 'boundary': xys })
 
-        write(name, f'drop table vd_{center}')
-
     return { 'virtual_districts': vds, 'isolated_nodes': isolated_nodes }