fix: innere Ringe bleiben unberücksichtigt

functions/knickpunkt_pruefung.py

@@ -277,21 +277,20 @@ def _fehlende_knickpunkte_via_verbindungslinien(
         return 0, []
 
     # ------------------------------------------------------------------
-    # Außenringe extrahieren
+    # Alle Ringe extrahieren (Außen- und Innenringe)
     # ------------------------------------------------------------------
-    exterior_rings: List[List[object]] = []
+    all_rings: List[List[object]] = []
     if bror_union.isMultipart():
         for poly in bror_union.asMultiPolygon():
-            if poly:
+            for ring in poly:
-                exterior_rings.append([QgsPointXY(x, y) for x, y in poly[0]])
+                all_rings.append([QgsPointXY(x, y) for x, y in ring])
     else:
-        poly = bror_union.asPolygon()
+        for ring in bror_union.asPolygon():
-        if poly:
+            all_rings.append([QgsPointXY(x, y) for x, y in ring])
-            exterior_rings.append([QgsPointXY(x, y) for x, y in poly[0]])
 
     # Schlusspunkt (= Startpunkt, Ring geschlossen) entfernen
     cleaned_rings: List[List[object]] = []
-    for ring in exterior_rings:
+    for ring in all_rings:
         if len(ring) >= 2:
             if (
                 abs(ring[-1].x() - ring[0].x()) < 1e-9
@@ -661,7 +660,7 @@ def erstelle_korrigiertes_polygon(
         return None, None
 
     # ------------------------------------------------------------------
-    # Alle BROR-Außenringe extrahieren (Multipolygon-sicher)
+    # Alle Polygon-Teile mit allen Ringen (Außen- und Innenringe)
     # ------------------------------------------------------------------
     try:
         bror_feats = [
@@ -673,25 +672,26 @@ def erstelle_korrigiertes_polygon(
             return None, None
 
         if bror_union.isMultipart():
-            all_raw_rings = [
+            all_poly_parts = [poly for poly in bror_union.asMultiPolygon() if poly]
-                poly[0] for poly in bror_union.asMultiPolygon() if poly
-            ]
         else:
             poly = bror_union.asPolygon()
-            all_raw_rings = [poly[0]] if poly else []
+            all_poly_parts = [poly] if poly else []
     except Exception:
         return None, None
 
-    if not all_raw_rings:
+    if not all_poly_parts:
         return None, None
 
     all_line_segments: List[Tuple[object, object]] = []
     all_polygon_feats: List[object] = []
 
     # ------------------------------------------------------------------
-    # Pro Polygon-Teil: Identisch-Punkte verorten, Verlauf aufbauen
+    # Pro Polygon-Teil: alle Ringe (Außen + Innen) verarbeiten
     # ------------------------------------------------------------------
-    for raw_ring in all_raw_rings:
+    for poly_rings in all_poly_parts:
+        corrected_qgs_rings: List[List[object]] = []
+
+        for raw_ring in poly_rings:
             ring_pts = [QgsPointXY(x, y) for x, y in raw_ring]
             if len(ring_pts) >= 2 and (
                 abs(ring_pts[-1].x() - ring_pts[0].x()) < 1e-9
@@ -714,14 +714,14 @@ def erstelle_korrigiertes_polygon(
             on_ring.sort(key=lambda t: t[0])
 
             if len(on_ring) < 3:
-            # Fallback: Original-Ring dieses Teilgebiets verwenden
+                # Fallback: Original-Ring verwenden
                 ordered_pts: List[object] = ring_pts
                 for j in range(len(ring_pts)):
                     all_line_segments.append(
                         (ring_pts[j], ring_pts[(j + 1) % len(ring_pts)])
                     )
             else:
-            # Korrigierten Verlauf für diesen Teil aufbauen
+                # Korrigierten Verlauf für diesen Ring aufbauen
                 ordered_pts = []
                 n_part = len(on_ring)
 
@@ -759,11 +759,14 @@ def erstelle_korrigiertes_polygon(
                             (all_pts_in_seg[j], all_pts_in_seg[j + 1])
                         )
 
-        if len(ordered_pts) < 3:
+            if len(ordered_pts) >= 3:
+                corrected_qgs_rings.append(ordered_pts + [ordered_pts[0]])
+
+        if not corrected_qgs_rings:
             continue
 
-        polygon_ring = ordered_pts + [ordered_pts[0]]
+        # Erstes Element = Außenring, weitere = Innenringe (Löcher)
-        polygon_geom = QgsGeometry.fromPolygonXY([polygon_ring])
+        polygon_geom = QgsGeometry.fromPolygonXY(corrected_qgs_rings)
         if polygon_geom and not polygon_geom.isEmpty():
             pf = QgsFeature()
             pf.setGeometry(polygon_geom)