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Addresses issue #24618 "Road sign" boxstyle/annotation #24697

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Addresses issue #24618 "Road sign" boxstyle/annotation #24697

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56 changes: 41 additions & 15 deletions lib/matplotlib/patches.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2372,14 +2372,19 @@ def __call__(self, x0, y0, width, height, mutation_size):
class LArrow:
"""A box in the shape of a left-pointing arrow."""

def __init__(self, pad=0.3):
def __init__(self, pad=0.3, fhead=False):
"""
Parameters
----------
pad : float, default: 0.3
The amount of padding around the original box.

fhead : bool, default: False
If the arrowheads should be flush with the top
and botton sides of the arrow body.
"""
self.pad = pad
self.fhead = fhead

def __call__(self, x0, y0, width, height, mutation_size):
# padding
Expand All @@ -2394,11 +2399,17 @@ def __call__(self, x0, y0, width, height, mutation_size):
dxx = dx / 2
x0 = x0 + pad / 1.4 # adjust by ~sqrt(2)

return Path._create_closed(
[(x0 + dxx, y0), (x1, y0), (x1, y1), (x0 + dxx, y1),
(x0 + dxx, y1 + dxx), (x0 - dx, y0 + dx),
(x0 + dxx, y0 - dxx), # arrow
(x0 + dxx, y0)])
if self.fhead:
return Path._create_closed([(x0 + dxx - pad, y0), (x1, y0),
(x1, y1), (x0 + dxx - pad, y1),
(x0 - dx - pad, y0 + dx),
(x0 + dxx - pad, y0)])

return Path._create_closed([(x0 + dxx, y0), (x1, y0), (x1, y1),
(x0 + dxx, y1), (x0 + dxx, y1 + dxx),
(x0 - dx, y0 + dx),
(x0 + dxx, y0 - dxx), # arrow
(x0 + dxx, y0), (x0 + dxx, y0)])

@_register_style(_style_list)
class RArrow(LArrow):
Expand All @@ -2415,14 +2426,19 @@ class DArrow:
"""A box in the shape of a two-way arrow."""
# Modified from LArrow to add a right arrow to the bbox.

def __init__(self, pad=0.3):
def __init__(self, pad=0.3, fhead=False):
"""
Parameters
----------
pad : float, default: 0.3
The amount of padding around the original box.

fhead : bool, default: False
If the arrowheads should be flush with the top
and botton sides of the arrow body.
"""
self.pad = pad
self.fhead = fhead

def __call__(self, x0, y0, width, height, mutation_size):
# padding
Expand All @@ -2438,14 +2454,24 @@ def __call__(self, x0, y0, width, height, mutation_size):
dxx = dx / 2
x0 = x0 + pad / 1.4 # adjust by ~sqrt(2)

return Path._create_closed([
(x0 + dxx, y0), (x1, y0), # bot-segment
(x1, y0 - dxx), (x1 + dx + dxx, y0 + dx),
(x1, y1 + dxx), # right-arrow
(x1, y1), (x0 + dxx, y1), # top-segment
(x0 + dxx, y1 + dxx), (x0 - dx, y0 + dx),
(x0 + dxx, y0 - dxx), # left-arrow
(x0 + dxx, y0)])
if self.fhead:
return Path._create_closed([(x0 + dxx - pad, y0),
(x1 + pad, y0),
(x1 + dx + dxx + pad, y0 + dx),
(x1 + pad, y1),
(x0 + dxx - pad, y1),
(x0 - dx - pad, y0 + dx),
(x0 + dxx - pad, y0)])

return Path._create_closed([(x0 + dxx, y0), (x1, y0),
(x1, y0 - dxx),
(x1 + dx + dxx, y0 + dx),
(x1, y1 + dxx), # right-arrow
(x1, y1), (x0 + dxx, y1),
(x0 + dxx, y1 + dxx),
(x0 - dx, y0 + dx),
(x0 + dxx, y0 - dxx), # left-arrow
(x0 + dxx, y0)])

@_register_style(_style_list)
class Round:
Expand Down
10 changes: 5 additions & 5 deletions tutorials/text/annotations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -192,10 +192,10 @@
# Class Name Attrs
# ========== ============== ==========================
# Circle ``circle`` pad=0.3
# DArrow ``darrow`` pad=0.3
# DArrow ``darrow`` pad=0.3,fhead=False
# Ellipse ``ellipse`` pad=0.3
# LArrow ``larrow`` pad=0.3
# RArrow ``rarrow`` pad=0.3
# LArrow ``larrow`` pad=0.3,fhead=False
# RArrow ``rarrow`` pad=0.3,fhead=False
# Round ``round`` pad=0.3,rounding_size=None
# Round4 ``round4`` pad=0.3,rounding_size=None
# Roundtooth ``roundtooth`` pad=0.3,tooth_size=None
Expand All @@ -215,12 +215,12 @@
# (facecolor, edgewidth, etc.) can be accessed and modified as usual.
# `.FancyBboxPatch.set_boxstyle` sets the box shape::
#
# bb.set_boxstyle("rarrow", pad=0.6)
# bb.set_boxstyle("rarrow", pad=0.6, fhead=True)
#
# The attribute arguments can also be specified within the style
# name with separating comma::
#
# bb.set_boxstyle("rarrow, pad=0.6")
# bb.set_boxstyle("rarrow, pad=0.6, fhead=True")
#
#
# Defining custom box styles
Expand Down