[Arc / Ellipse / Circle] gracefully handle large arclen

masque/test/test_shape_advanced.py

@@ -109,6 +109,19 @@ def test_rotated_arc_bounds_match_polygonized_geometry() -> None:
     bounds = arc.get_bounds_single()
     poly_bounds = arc.to_polygons(num_vertices=8192)[0].get_bounds_single()
     assert_allclose(bounds, poly_bounds, atol=1e-3)
+
+
+def test_curve_polygonizers_clamp_large_max_arclen() -> None:
+    for shape in (
+            Circle(radius=10),
+            Ellipse(radii=(10, 20)),
+            Arc(radii=(10, 20), angles=(0, 1), width=2),
+            ):
+        polys = shape.to_polygons(num_vertices=None, max_arclen=1e9)
+        assert len(polys) == 1
+        assert len(polys[0].vertices) >= 3
+
+
 def test_path_edge_cases() -> None:
     # Zero-length segments
     p = MPath(vertices=[[0, 0], [0, 0], [10, 0]], width=2)