An event handler for Matplotlib-based visualizations that executes functions registered with
MPLVisualization.addKeypress() and routes other events to the appropriate
ChartPlot object depending on the current mouse position, which are received by
ChartPlot.MPLEvent(). This function should not be called directly by user code.
sendEvent() currently routes
button_press_event (mouse clicks), and
pick_event (mouse clicks associated with particular pickable
WARNING: This is an internal function. Its use in user code is not recommended or supported, and its signature can change in future updates without warning. Use one of the suggested functions above instead, if applicable.
event — matplotlib.KeyEvent, required
The Matplotlib event object corresponding to the keypress.