Interacting with plots

A class for interactively annotating matplotlib plots.

This class was inspired by code posted by HappyLeapSecond which was derived from code posted by Joe Kington. See:

http://stackoverflow.com/questions/13306519/get-data-from-plot-with-matplotlib

The DataCursor Class

DataCursor([ax, figs, hover, mk_label, ...])	Class to show x, y data points and to allow selection of points for annotations.
DataCursor.on([ax, figs, callbacks, reset])	Turns on and (re-)initializes the DataCursor for current figures.
DataCursor.off([stop_blocking])	Turns off the DataCursor and optionally stops it from blocking
DataCursor.addpt_func(func)	Function to call on a left-click.
DataCursor.delpt_func(func)	Function to call on a right-click.
DataCursor.getdata([maxpoints, msg])	Suspend python while user selects points up to maxpoints.
DataCursor.pause([msg])	Suspend python so user can interact with plots (such as moving previously added annotations) before continuing.