diff --git a/lib/matplotlib/bezier.py b/lib/matplotlib/bezier.py
index 44c74c458982..d3e74afb4881 100644
--- a/lib/matplotlib/bezier.py
+++ b/lib/matplotlib/bezier.py
@@ -429,23 +429,23 @@ def get_parallels(bezier2, width):
# find cm_left which is the intersecting point of a line through
# c1_left with angle t1 and a line through c2_left with angle
# t2. Same with cm_right.
- if parallel_test != 0:
- # a special case for a straight line, i.e., angle between two
- # lines are smaller than some (arbitrary) value.
- cmx_left, cmy_left = (
- 0.5 * (c1x_left + c2x_left), 0.5 * (c1y_left + c2y_left)
- )
- cmx_right, cmy_right = (
- 0.5 * (c1x_right + c2x_right), 0.5 * (c1y_right + c2y_right)
- )
- else:
+ try:
cmx_left, cmy_left = get_intersection(c1x_left, c1y_left, cos_t1,
sin_t1, c2x_left, c2y_left,
cos_t2, sin_t2)
-
cmx_right, cmy_right = get_intersection(c1x_right, c1y_right, cos_t1,
sin_t1, c2x_right, c2y_right,
cos_t2, sin_t2)
+ except ValueError:
+ # Special case straight lines, i.e., angle between two lines is
+ # less than the threshold used by get_intersection (we don't use
+ # check_if_parallel as the threshold is not the same).
+ cmx_left, cmy_left = (
+ 0.5 * (c1x_left + c2x_left), 0.5 * (c1y_left + c2y_left)
+ )
+ cmx_right, cmy_right = (
+ 0.5 * (c1x_right + c2x_right), 0.5 * (c1y_right + c2y_right)
+ )
# the parallel Bezier lines are created with control points of
# [c1_left, cm_left, c2_left] and [c1_right, cm_right, c2_right]
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