.. _pylab_examples-coords_demo:

pylab_examples example code: coords_demo.py
===========================================



.. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/pylab_examples/coords_demo.py

::

    #!/usr/bin/env python
    
    """
    An example of how to interact with the plotting canvas by connecting
    to move and click events
    """
    from __future__ import print_function
    import sys
    import matplotlib.pyplot as plt
    import numpy as np
    
    t = np.arange(0.0, 1.0, 0.01)
    s = np.sin(2*np.pi*t)
    fig, ax = plt.subplots()
    ax.plot(t, s)
    
    
    def on_move(event):
        # get the x and y pixel coords
        x, y = event.x, event.y
    
        if event.inaxes:
            ax = event.inaxes  # the axes instance
            print('data coords %f %f' % (event.xdata, event.ydata))
    
    
    def on_click(event):
        # get the x and y coords, flip y from top to bottom
        x, y = event.x, event.y
        if event.button == 1:
            if event.inaxes is not None:
                print('data coords %f %f' % (event.xdata, event.ydata))
    
    binding_id = plt.connect('motion_notify_event', on_move)
    plt.connect('button_press_event', on_click)
    
    if "test_disconnect" in sys.argv:
        print("disconnecting console coordinate printout...")
        plt.disconnect(binding_id)
    
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)