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Backport PR #29801 on branch v3.10.x (DOC: Slightly further improve arrowstyle demo) #29818

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merged 1 commit into from
Mar 28, 2025
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Backport PR #29801 on branch v3.10.x (DOC: Slightly further improve arrowstyle demo) #29818

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38 changes: 21 additions & 17 deletions galleries/examples/text_labels_and_annotations/fancyarrow_demo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,11 @@
Annotation arrow style reference
================================

Overview of the arrow styles available in `~.Axes.annotate`.
Overview of the available `.ArrowStyle` settings. These are used for the *arrowstyle*
parameter of `~.Axes.annotate` and `.FancyArrowPatch`.

Each style can be configured with a set of parameters, which are stated along with
their default values.
"""

import inspect
Expand All @@ -12,38 +16,38 @@

import matplotlib.pyplot as plt

import matplotlib.patches as mpatches
from matplotlib.patches import ArrowStyle

styles = mpatches.ArrowStyle.get_styles()
styles = ArrowStyle.get_styles()
ncol = 2
nrow = (len(styles) + 1) // ncol
axs = (plt.figure(figsize=(4 * ncol, 1 + nrow))
.add_gridspec(1 + nrow, ncol,
wspace=0, hspace=0, left=0, right=1, bottom=0, top=1).subplots())
gridspec_kw = dict(wspace=0, hspace=0.05, left=0, right=1, bottom=0, top=1)
fig, axs = plt.subplots(1 + nrow, ncol,
figsize=(4 * ncol, 1 + nrow), gridspec_kw=gridspec_kw)
for ax in axs.flat:
ax.set_xlim(-0.5, 4)
ax.set_xlim(-0.1, 4)
ax.set_axis_off()
for ax in axs[0, :]:
ax.text(-0.25, 0.5, "arrowstyle", size="large", color="tab:blue")
ax.text(1.25, .5, "default parameters", size="large")
ax.text(0, 0.5, "arrowstyle", size="large", color="tab:blue")
ax.text(1.4, .5, "default parameters", size="large")
for ax, (stylename, stylecls) in zip(axs[1:, :].T.flat, styles.items()):
# draw dot and annotation with arrowstyle
l, = ax.plot(1, 0, "o", color="grey")
ax.annotate(stylename, (1, 0), (0, 0),
size="large", color="tab:blue", ha="center", va="center",
l, = ax.plot(1.25, 0, "o", color="darkgrey")
ax.annotate(stylename, (1.25, 0), (0, 0),
size="large", color="tab:blue", va="center", family="monospace",
arrowprops=dict(
arrowstyle=stylename, connectionstyle="arc3,rad=-0.05",
color="k", shrinkA=5, shrinkB=5, patchB=l,
arrowstyle=stylename, connectionstyle="arc3,rad=0",
color="black", shrinkA=5, shrinkB=5, patchB=l,
),
bbox=dict(boxstyle="square", fc="w", ec="grey"))
bbox=dict(boxstyle="square", fc="w", ec="darkgrey"))
# draw default parameters
# wrap at every nth comma (n = 1 or 2, depending on text length)
s = str(inspect.signature(stylecls))[1:-1]
n = 2 if s.count(',') > 3 else 1
ax.text(1.25, 0,
ax.text(1.4, 0,
re.sub(', ', lambda m, c=itertools.count(1): m.group()
if next(c) % n else '\n', s),
verticalalignment="center")
verticalalignment="center", color="0.3")

plt.show()

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