Smoothing and clamping (#3772)

* smoothing: ensure start and end of original path
* clamp path: never intersecting path could also be entirely in the exterior of the shape

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/utils/clamp_path.py b/lib/utils/clamp_path.py
index fcb34a4b..6b3a56e5 100644
--- a/lib/utils/clamp_path.py
+++ b/lib/utils/clamp_path.py
@@ -106,7 +106,10 @@ def clamp_path_to_polygon(path, polygon):
     except FloatingPointError:
         return path
 
-    if len(split_path.geoms) == 1:
+    # contains() checks can fail without the buffer.
+    buffered_polygon = prep(polygon.buffer(1e-9))
+
+    if len(split_path.geoms) == 1 and buffered_polygon.contains(split_path.geoms[0]):
         # The path never intersects with the polygon, so it's entirely inside.
         return path
 
@@ -114,9 +117,6 @@ def clamp_path_to_polygon(path, polygon):
     # start or end coincides with the polygon boundary
     split_path = [ShapelyPoint(start), *split_path.geoms, ShapelyPoint(end)]
 
-    # contains() checks can fail without the buffer.
-    buffered_polygon = prep(polygon.buffer(1e-9))
-
     last_point_inside = None
     was_inside = False
     result = []