enable azimut editing through lines

fix #108

datamodel/app/create_app.py

@@ -34,6 +34,8 @@ def create_views(srid: int, pg_service: str):
     run_sql("datamodel/app/create_schema.sql", pg_service, variables)
 
     run_sql("datamodel/app/vw_edited_support.sql", pg_service, variables)
+    run_sql("datamodel/app/vw_azimut_edit.sql", pg_service, variables)
+
     vw_sign_symbol(pg_service=pg_service, srid=srid)
 
 

datamodel/app/vw_azimut_edit.sql

@@ -0,0 +1,30 @@
+
+
+CREATE OR REPLACE VIEW signalo_app.vw_azimut_edit
+AS
+SELECT
+  az.id,
+  ST_MakeLine(su.geometry, ST_SetSRID(St_MakePoint(ST_X(su.geometry) + 10 * sin(radians(az.azimut)), ST_Y(su.geometry) + 10 *cos(radians(az.azimut))), 2056))::geometry(LineString, 2056) as geometry
+FROM signalo_db.azimut az
+INNER JOIN signalo_db.support su ON az.fk_support = su.id;
+
+
+CREATE FUNCTION signalo_app.ft_azimut_edit() RETURNS trigger
+    LANGUAGE plpgsql
+    AS $$
+	BEGIN
+        IF ST_Equals(ST_StartPoint(NEW.geometry), ST_StartPoint(OLD.geometry)) THEN
+            RAISE WARNING 'start point should remain unchanged';
+        END IF;
+
+        UPDATE signalo_db.azimut SET azimut = degrees(ST_Azimuth(ST_StartPoint(NEW.geometry), ST_EndPoint(NEW.geometry))) WHERE id = NEW.id;
+
+        RETURN NEW;
+	END;
+	$$;
+
+
+CREATE TRIGGER azimut_update
+    INSTEAD OF UPDATE ON signalo_app.vw_azimut_edit
+    FOR EACH ROW
+    EXECUTE FUNCTION signalo_app.ft_azimut_edit();