Re: [Matplotlib-users] ginput() equivalent?

[John H. <jdh...@ac...>]

>>>>> "Sajec," == Sajec, Mike TQO <ms...@tq...> writes:

    Sajec,> Is there a simple way to grab x,y coordinates from active
    Sajec,> plot in a manner similar to using matlab's ginput()
    Sajec,> function?

It depends on what you mean by simple :-)

matplotlib provides a GUI independent way to capture basic events, eg
to get the mouse coordinates in screen and data units and button
clicks, key presses, etc.

See http://matplotlib.sourceforge.net/tutorial.html#events

Some people do not find callbacks intuitive.  If you are one of these
people, you might try something like the following


from pylab import *

class MouseMonitor:
    event = None
    def __call__(self, event):
        self.event = event


mouse = MouseMonitor()
connect('button_press_event', mouse)

plot([1,2,3])


Now you can click on the plot, and get the coords like so

print mouse.event.xdata, mouse.event.ydata


See
http://matplotlib.sourceforge.net/matplotlib.backend_bases.html#MouseEvent
for more information on the mouse event attributes


There are a couple of demos for event handling

  examples/keypress_demo.py
  examples/coords_demo.py

JDH