"""
The SpanSelector is a mouse widget to select a xmin/xmax range and plot the
detail view of the selected region in the lower axes
"""
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import SpanSelector

fig = plt.figure(figsize=(8, 6))
ax = fig.add_subplot(211, facecolor='#FFFFCC')

x = np.arange(0.0, 5.0, 0.01)
y = np.sin(2*np.pi*x) + 0.5*np.random.randn(len(x))

ax.plot(x, y, '-')
ax.set_ylim(-2, 2)
ax.set_title('Press left mouse button and drag to test')

ax2 = fig.add_subplot(212, facecolor='#FFFFCC')
line2, = ax2.plot(x, y, '-')


def onselect(xmin, xmax):
    indmin, indmax = np.searchsorted(x, (xmin, xmax))
    indmax = min(len(x) - 1, indmax)

    thisx = x[indmin:indmax]
    thisy = y[indmin:indmax]
    line2.set_data(thisx, thisy)
    ax2.set_xlim(thisx[0], thisx[-1])
    ax2.set_ylim(thisy.min(), thisy.max())
    fig.canvas.draw()

# set useblit True on gtkagg for enhanced performance
span = SpanSelector(ax, onselect, 'horizontal', useblit=True,
                    rectprops=dict(alpha=0.5, facecolor='red'))


plt.show() 

　

　

　

Traceback (most recent call last):
  File "M:\______\span_selector.py", line 35, in 
    span = SpanSelector(ax, onselect, 'horizontal', useblit=True,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\_api\deprecation.py", line 454, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
TypeError: SpanSelector.__init__() got an unexpected keyword argument 'rectprops' 

Traceback (most recent call last):
  File "E:\______\span_selector.py", line 35, in 
    span = SpanSelector(ax, onselect, 'horizontal', useblit=True,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\_api\deprecation.py", 
    line 454, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
TypeError: SpanSelector.__init__() got an unexpected keyword argument 'rectprops' 

"""
=============
Span Selector
=============

The `.SpanSelector` is a mouse widget that enables selecting a range on an
axis.

Here, an x-range can be selected on the upper axis; a detailed view of the
selected range is then plotted on the lower axis.

.. note::

    If the SpanSelector object is garbage collected you will lose the
    interactivity.  You must keep a hard reference to it to prevent this.
"""

import matplotlib.pyplot as plt
import numpy as np

from matplotlib.widgets import SpanSelector

# Fixing random state for reproducibility
np.random.seed(19680801)

fig, (ax1, ax2) = plt.subplots(2, figsize=(8, 6))

x = np.arange(0.0, 5.0, 0.01)
y = np.sin(2 * np.pi * x) + 0.5 * np.random.randn(len(x))

ax1.plot(x, y)
ax1.set_ylim(-2, 2)
ax1.set_title('Press left mouse button and drag '
              'to select a region in the top graph')

line2, = ax2.plot([], [])


def onselect(xmin, xmax):
    indmin, indmax = np.searchsorted(x, (xmin, xmax))
    indmax = min(len(x) - 1, indmax)

    region_x = x[indmin:indmax]
    region_y = y[indmin:indmax]

    if len(region_x) >= 2:
        line2.set_data(region_x, region_y)
        ax2.set_xlim(region_x[0], region_x[-1])
        ax2.set_ylim(region_y.min(), region_y.max())
        fig.canvas.draw_idle()


span = SpanSelector(
    ax1,
    onselect,
    "horizontal",
    useblit=True,
    props=dict(alpha=0.5, facecolor="tab:blue"),
    interactive=True,
    drag_from_anywhere=True
)
# Set useblit=True on most backends for enhanced performance.


plt.show()

# %%
#
# .. admonition:: References
#
#    The use of the following functions, methods, classes and modules is shown
#    in this example:
#
#    - `matplotlib.widgets.SpanSelector` 

　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。

　

• 2023/12/13 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/12/13 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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