import matplotlib.pyplot as plt


def draw_text(ax):
    from matplotlib.offsetbox import AnchoredText
    at = AnchoredText("Figure 1a",
                      loc=2, prop=dict(size=8), frameon=True,
                      )
    at.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
    ax.add_artist(at)

    at2 = AnchoredText("Figure 1(b)",
                       loc=3, prop=dict(size=8), frameon=True,
                       bbox_to_anchor=(0., 1.),
                       bbox_transform=ax.transAxes
                       )
    at2.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
    ax.add_artist(at2)


def draw_circle(ax):  # circle in the canvas coordinate
    from mpl_toolkits.axes_grid1.anchored_artists import AnchoredDrawingArea
    from matplotlib.patches import Circle
    ada = AnchoredDrawingArea(20, 20, 0, 0,
                              loc=1, pad=0., frameon=False)
    p = Circle((10, 10), 10)
    ada.da.add_artist(p)
    ax.add_artist(ada)


def draw_ellipse(ax):
    from mpl_toolkits.axes_grid1.anchored_artists import AnchoredEllipse
    # draw an ellipse of width=0.1, height=0.15 in the data coordinate
    ae = AnchoredEllipse(ax.transData, width=0.1, height=0.15, angle=0.,
                         loc=3, pad=0.5, borderpad=0.4, frameon=True)

    ax.add_artist(ae)


def draw_sizebar(ax):
    from mpl_toolkits.axes_grid1.anchored_artists import AnchoredSizeBar
    # draw a horizontal bar with length of 0.1 in Data coordinate
    # (ax.transData) with a label underneath.
    asb = AnchoredSizeBar(ax.transData,
                          0.1,
                          r"1$^{\prime}$",
                          loc=8,
                          pad=0.1, borderpad=0.5, sep=5,
                          frameon=False)
    ax.add_artist(asb)


if 1:
    ax = plt.gca()
    ax.set_aspect(1.)

    draw_text(ax)
    draw_circle(ax)
    draw_ellipse(ax)
    draw_sizebar(ax)

    plt.show() 

　

E:\______\simple_anchored_artists.py:34: MatplotlibDeprecationWarning: 
    The AnchoredEllipse class was deprecated in Matplotlib 3.8 and will 
    be removed two minor releases later.
  ae = AnchoredEllipse(ax.transData, width=0.1, height=0.15, angle=0., 

"""
================
Anchored Artists
================

This example illustrates the use of the anchored objects without the
helper classes found in :mod:`mpl_toolkits.axes_grid1`. This version
of the figure is similar to the one found in
:doc:`/gallery/axes_grid1/simple_anchored_artists`, but it is
implemented using only the matplotlib namespace, without the help
of additional toolkits.

.. redirect-from:: /gallery/userdemo/anchored_box01
.. redirect-from:: /gallery/userdemo/anchored_box02
.. redirect-from:: /gallery/userdemo/anchored_box03
"""

from matplotlib import pyplot as plt
from matplotlib.lines import Line2D
from matplotlib.offsetbox import (AnchoredOffsetbox, AuxTransformBox,
                                  DrawingArea, TextArea, VPacker)
from matplotlib.patches import Circle, Ellipse


def draw_text(ax):
    """Draw a text-box anchored to the upper-left corner of the figure."""
    box = AnchoredOffsetbox(child=TextArea("Figure 1a"),
                            loc="upper left", frameon=True)
    box.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
    ax.add_artist(box)


def draw_circles(ax):
    """Draw circles in axes coordinates."""
    area = DrawingArea(width=40, height=20)
    area.add_artist(Circle((10, 10), 10, fc="tab:blue"))
    area.add_artist(Circle((30, 10), 5, fc="tab:red"))
    box = AnchoredOffsetbox(
        child=area, loc="upper right", pad=0, frameon=False)
    ax.add_artist(box)


def draw_ellipse(ax):
    """Draw an ellipse of width=0.1, height=0.15 in data coordinates."""
    aux_tr_box = AuxTransformBox(ax.transData)
    aux_tr_box.add_artist(Ellipse((0, 0), width=0.1, height=0.15))
    box = AnchoredOffsetbox(child=aux_tr_box, loc="lower left", frameon=True)
    ax.add_artist(box)


def draw_sizebar(ax):
    """
    Draw a horizontal bar with length of 0.1 in data coordinates,
    with a fixed label center-aligned underneath.
    """
    size = 0.1
    text = r"1$^{\prime}$"
    sizebar = AuxTransformBox(ax.transData)
    sizebar.add_artist(Line2D([0, size], [0, 0], color="black"))
    text = TextArea(text)
    packer = VPacker(
        children=[sizebar, text], align="center", sep=5)  # separation in points.
    ax.add_artist(AnchoredOffsetbox(
        child=packer, loc="lower center", frameon=False,
        pad=0.1, borderpad=0.5))  # paddings relative to the legend fontsize.


fig, ax = plt.subplots()
ax.set_aspect(1)

draw_text(ax)
draw_circles(ax)
draw_ellipse(ax)
draw_sizebar(ax)

plt.show() 

　Python 3.11.6 (matplotlib 3.7.1) 及び Python 3.12.0 (matplotlib 3.8.1) 共に、正常に、実行できる。

　

• 2023/11/13 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/11/13 Ver=1.04 Python 3.11.6 (matplotlib 3.7.1)で確認
• 2023/03/28 Ver=1.03 Python 3.11.2 で確認
• 2020/10/30 Ver=1.01 Python 3.7.8 で確認
• 2018/11/24 Ver=1.01 初版リリース

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