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# Rectangle Selector

Do a mouseclick somewhere, move the mouse to some destination, release the button. This class gives click- and release-events and also draws a line or a box from the click-point to the actual mouseposition (within the same axes) until the button is released. Within the method ‘self.ignore()’ it is checked whether the button from eventpress and eventrelease are the same.

Out:

    click  -->  release

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

    def line_select_callback(eclick, erelease):
        'eclick and erelease are the press and release events'
        x1, y1 = eclick.xdata, eclick.ydata
        x2, y2 = erelease.xdata, erelease.ydata
        print("(%3.2f, %3.2f) --> (%3.2f, %3.2f)" % (x1, y1, x2, y2))
        print(" The button you used were: %s %s" % (eclick.button, erelease.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)

    fig, current_ax = plt.subplots()                 # make a new plotting range
    N = 100000                                       # If N is large one can see
    x = np.linspace(0.0, 10.0, N)                    # improvement by use blitting!

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

    print("\n      click  -->  release")

    # drawtype is 'box' or 'line' or 'none'
    toggle_selector.RS = RectangleSelector(current_ax, line_select_callback,
                                           drawtype='box', useblit=True,
                                           button=[1, 3],  # don't use middle button
                                           minspanx=5, minspany=5,
                                           spancoords='pixels',
                                           interactive=True)
    plt.connect('key_press_event', toggle_selector)
    plt.show()

Total running time of the script: ( 0 minutes 0.043 seconds)

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