"""
=====================
Annotation with units
=====================

The example illustrates how to create text and arrow
annotations using a centimeter-scale plot.

"""
import matplotlib.pyplot as plt
from basic_units import cm

fig, ax = plt.subplots()

ax.annotate("Note 01", [0.5*cm, 0.5*cm])

# xy and text both unitized
ax.annotate('local max', xy=(3*cm, 1*cm), xycoords='data',
            xytext=(0.8*cm, 0.95*cm), textcoords='data',
            arrowprops=dict(facecolor='black', shrink=0.05),
            horizontalalignment='right', verticalalignment='top')

# mixing units w/ nonunits
ax.annotate('local max', xy=(3*cm, 1*cm), xycoords='data',
            xytext=(0.8, 0.95), textcoords='axes fraction',
            arrowprops=dict(facecolor='black', shrink=0.05),
            horizontalalignment='right', verticalalignment='top')


ax.set_xlim(0*cm, 4*cm)
ax.set_ylim(0*cm, 4*cm)
plt.show() 

　このサンプルを実行するときに、basic_units_org.py が必要です。取り敢えず、実行時のカレント・ディレクトリに置けば動作します。

　

Traceback (most recent call last):
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axis.py", line 1732, in convert_units
    ret = self.converter.convert(x, self.units, self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "M:\______\basic_units.py", line 341, in convert
    if units.ConversionInterface.is_numlike(val):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'ConversionInterface' has no attribute 'is_numlike'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "M:\______\annotate_with_units.py", line 30, in 
    ax.set_xlim(0*cm, 4*cm)
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\_api\deprecation.py", line 454, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axes\_base.py", line 3650, in set_xlim
    return self.xaxis._set_lim(left, right, emit=emit, auto=auto)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axis.py", line 1184, in _set_lim
    v0 = self.axes._validate_converted_limits(v0, self.convert_units)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axes\_base.py", line 3567, in _validate_converted_limits
    converted_limit = convert(limit)
                      ^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axis.py", line 1734, in convert_units
    raise munits.ConversionError('Failed to convert value(s) to axis '
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 
  TaggedValue(0, BasicUnit(cm)) 

Traceback (most recent call last):
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axis.py", 
    line 1769, in convert_units
    ret = self.converter.convert(x, self.units, self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\______\basic_units.py", line 341, in convert
    if units.ConversionInterface.is_numlike(val):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'ConversionInterface' has no attribute 'is_numlike'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "E:\______\annotate_with_units.py", line 30, in 
    ax.set_xlim(0*cm, 4*cm)
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axes\_base.py", 
    line 3664, in set_xlim
    return self.xaxis._set_lim(left, right, emit=emit, auto=auto)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axis.py", 
    line 1210, in _set_lim
    v0 = self.axes._validate_converted_limits(v0, self.convert_units)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axes\_base.py", 
    line 3580, in _validate_converted_limits
    converted_limit = convert(limit)
                      ^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axis.py", 
    line 1771, in convert_units
    raise munits.ConversionError('Failed to convert value(s) to axis '
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 
  TaggedValue(0, BasicUnit(cm)) 

"""
=====================
Annotation with units
=====================

The example illustrates how to create text and arrow
annotations using a centimeter-scale plot.

.. only:: builder_html

   This example requires :download:`basic_units.py `
"""

from basic_units import cm

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

ax.annotate("Note 01", [0.5*cm, 0.5*cm])

# xy and text both unitized
ax.annotate('local max', xy=(3*cm, 1*cm), xycoords='data',
            xytext=(0.8*cm, 0.95*cm), textcoords='data',
            arrowprops=dict(facecolor='black', shrink=0.05),
            horizontalalignment='right', verticalalignment='top')

# mixing units w/ nonunits
ax.annotate('local max', xy=(3*cm, 1*cm), xycoords='data',
            xytext=(0.8, 0.95), textcoords='axes fraction',
            arrowprops=dict(facecolor='black', shrink=0.05),
            horizontalalignment='right', verticalalignment='top')


ax.set_xlim(0*cm, 4*cm)
ax.set_ylim(0*cm, 4*cm)
plt.show() 

　Python 3.11.6 (matplotlib 3.7.1) 及び Python 3.12.0 (matplotlib 3.8.1) 共に、正常実行です。
　このサンプルを実行するときに、basic_units.py が必要です。取り敢えず、実行時のカレント・ディレクトリに置けば動作します。

　

• 2023/12/11 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/12/11 Ver=1.04 Python 3.11.6 (matplotlib 3.7.1)で確認
• 2023/04/06 Ver=1.03 Python 3.11.2 で確認
• 2020/11/03 Ver=1.01 Python 3.7.8 で確認
• 2018/12/08 Ver=1.01 初版リリース

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