fix clipping empty data #1096

mozman · May 30, 2024 · 8db35cd · 8db35cd
1 parent 8eac297
commit 8db35cd
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diff --git a/notes/pages/CHANGELOG.md b/notes/pages/CHANGELOG.md
@@ -13,6 +13,8 @@
 		- {{issue 1085}}
 	- BUGFIX: `clipping.is_inside_polygon()` function was incorrect
 		- {{issue 1094}}
+	- BUGFIX: `ClippingPolygon` raises exception clipping empty data
+		- {{issue 1096}}
 		-
 - ## Version 1.3.0 - 2024-05-01
   id:: 65e30c28-021e-4c24-ab6e-a9e9fa7c6a51

diff --git a/src/ezdxf/tools/clipping_portal.py b/src/ezdxf/tools/clipping_portal.py
@@ -247,6 +247,8 @@ def clip_line(self, start: Vec2, end: Vec2) -> Sequence[tuple[Vec2, Vec2]]:
 
     def clip_polyline(self, points: NumpyPoints2d) -> Sequence[NumpyPoints2d]:
         clipper = self.clipper
+        if len(points) == 0:
+            return tuple()
         polyline_bbox = BoundingBox2d(points.extents())
         if self.is_completely_outside(polyline_bbox):
             return tuple()
@@ -260,6 +262,8 @@ def clip_polyline(self, points: NumpyPoints2d) -> Sequence[NumpyPoints2d]:
 
     def clip_polygon(self, points: NumpyPoints2d) -> Sequence[NumpyPoints2d]:
         clipper = self.clipper
+        if len(points) < 2:
+            return tuple()
         polygon_bbox = BoundingBox2d(points.extents())
         if self.is_completely_outside(polygon_bbox):
             return tuple()
@@ -278,6 +282,8 @@ def clip_paths(
         for path in paths:
             for sub_path in path.sub_paths():
                 path_bbox = BoundingBox2d(sub_path.control_vertices())
+                if not path_bbox.has_data:
+                    continue
                 if self.is_completely_inside(path_bbox):
                     yield sub_path
                     continue