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Cleanup RectangleSelector example. #17475

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May 22, 2020
Merged

Cleanup RectangleSelector example. #17475

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24 changes: 12 additions & 12 deletions examples/widgets/rectangle_selector.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,23 +30,23 @@ def line_select_callback(eclick, erelease):

def toggle_selector(event):
print(' Key pressed.')
if event.key in ['Q', 'q'] and toggle_selector.RS.active:
print(' RectangleSelector deactivated.')
toggle_selector.RS.set_active(False)
if event.key in ['A', 'a'] and not toggle_selector.RS.active:
print(' RectangleSelector activated.')
toggle_selector.RS.set_active(True)
if event.key == 't':
if toggle_selector.RS.active:
print(' RectangleSelector deactivated.')
toggle_selector.RS.set_active(False)
else:
print(' RectangleSelector activated.')
toggle_selector.RS.set_active(True)


fig, ax = plt.subplots()
N = 100000 # If N is large one can see improvement by using blitting.
x = np.linspace(0.0, 10.0, N)
x = np.linspace(0, 10, N)

ax.plot(x, +np.sin(.2*np.pi*x), lw=3.5, c='b', alpha=.7) # plot something
ax.plot(x, +np.cos(.2*np.pi*x), lw=3.5, c='r', alpha=.5)
ax.plot(x, -np.sin(.2*np.pi*x), lw=3.5, c='g', alpha=.3)

print("\n click --> release")
ax.plot(x, np.sin(2*np.pi*x)) # plot something
ax.set_title(
"Click and drag to draw a rectangle.\n"
"Press 't' to toggle the selector on and off.")

# drawtype is 'box' or 'line' or 'none'
toggle_selector.RS = RectangleSelector(ax, line_select_callback,
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32 changes: 3 additions & 29 deletions lib/matplotlib/widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1896,35 +1896,9 @@ class RectangleSelector(_SelectorWidget):

For the cursor to remain responsive you must keep a reference to it.

Example usage::

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import RectangleSelector

def onselect(eclick, erelease):
"eclick and erelease are matplotlib events at press and release."
print('startposition: (%f, %f)' % (eclick.xdata, eclick.ydata))
print('endposition : (%f, %f)' % (erelease.xdata, erelease.ydata))
print('used button : ', eclick.button)

def toggle_selector(event):
print('Key pressed.')
if event.key in ['Q', 'q'] and toggle_selector.RS.active:
print('RectangleSelector deactivated.')
toggle_selector.RS.set_active(False)
if event.key in ['A', 'a'] and not toggle_selector.RS.active:
print('RectangleSelector activated.')
toggle_selector.RS.set_active(True)

x = np.arange(100.) / 99
y = np.sin(x)
fig, ax = plt.subplots()
ax.plot(x, y)

toggle_selector.RS = RectangleSelector(ax, onselect, drawtype='line')
fig.canvas.mpl_connect('key_press_event', toggle_selector)
plt.show()
Examples
--------
:doc:`/gallery/widgets/rectangle_selector`
"""

_shape_klass = Rectangle
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