353 lines
11 KiB
Python
353 lines
11 KiB
Python
"""
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This provides several classes used for blocking interaction with figure
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windows:
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`BlockingInput`
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Creates a callable object to retrieve events in a blocking way for
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interactive sessions. Base class of the other classes listed here.
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`BlockingKeyMouseInput`
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Creates a callable object to retrieve key or mouse clicks in a blocking
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way for interactive sessions. Used by `waitforbuttonpress`.
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`BlockingMouseInput`
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Creates a callable object to retrieve mouse clicks in a blocking way for
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interactive sessions. Used by `ginput`.
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`BlockingContourLabeler`
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Creates a callable object to retrieve mouse clicks in a blocking way that
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will then be used to place labels on a `ContourSet`. Used by `clabel`.
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"""
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import logging
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from numbers import Integral
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import matplotlib.lines as mlines
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_log = logging.getLogger(__name__)
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class BlockingInput(object):
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"""Callable for retrieving events in a blocking way."""
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def __init__(self, fig, eventslist=()):
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self.fig = fig
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self.eventslist = eventslist
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def on_event(self, event):
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"""
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Event handler; will be passed to the current figure to retrieve events.
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"""
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# Add a new event to list - using a separate function is overkill for
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# the base class, but this is consistent with subclasses.
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self.add_event(event)
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_log.info("Event %i", len(self.events))
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# This will extract info from events.
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self.post_event()
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# Check if we have enough events already.
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if len(self.events) >= self.n > 0:
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self.fig.canvas.stop_event_loop()
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def post_event(self):
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"""For baseclass, do nothing but collect events."""
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def cleanup(self):
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"""Disconnect all callbacks."""
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for cb in self.callbacks:
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self.fig.canvas.mpl_disconnect(cb)
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self.callbacks = []
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def add_event(self, event):
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"""For base class, this just appends an event to events."""
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self.events.append(event)
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def pop_event(self, index=-1):
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"""
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Remove an event from the event list -- by default, the last.
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Note that this does not check that there are events, much like the
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normal pop method. If no events exist, this will throw an exception.
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"""
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self.events.pop(index)
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pop = pop_event
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def __call__(self, n=1, timeout=30):
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"""Blocking call to retrieve *n* events."""
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if not isinstance(n, Integral):
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raise ValueError("Requires an integer argument")
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self.n = n
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self.events = []
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if hasattr(self.fig.canvas, "manager"):
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# Ensure that the figure is shown, if we are managing it.
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self.fig.show()
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# Connect the events to the on_event function call.
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self.callbacks = [self.fig.canvas.mpl_connect(name, self.on_event)
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for name in self.eventslist]
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try:
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# Start event loop.
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self.fig.canvas.start_event_loop(timeout=timeout)
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finally: # Run even on exception like ctrl-c.
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# Disconnect the callbacks.
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self.cleanup()
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# Return the events in this case.
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return self.events
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class BlockingMouseInput(BlockingInput):
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"""
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Callable for retrieving mouse clicks in a blocking way.
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This class will also retrieve keypresses and map them to mouse clicks:
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delete and backspace are like mouse button 3, enter is like mouse button 2
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and all others are like mouse button 1.
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"""
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button_add = 1
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button_pop = 3
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button_stop = 2
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def __init__(self, fig, mouse_add=1, mouse_pop=3, mouse_stop=2):
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BlockingInput.__init__(self, fig=fig,
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eventslist=('button_press_event',
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'key_press_event'))
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self.button_add = mouse_add
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self.button_pop = mouse_pop
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self.button_stop = mouse_stop
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def post_event(self):
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"""Process an event."""
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if len(self.events) == 0:
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_log.warning("No events yet")
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elif self.events[-1].name == 'key_press_event':
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self.key_event()
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else:
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self.mouse_event()
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def mouse_event(self):
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"""Process a mouse click event."""
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event = self.events[-1]
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button = event.button
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if button == self.button_pop:
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self.mouse_event_pop(event)
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elif button == self.button_stop:
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self.mouse_event_stop(event)
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elif button == self.button_add:
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self.mouse_event_add(event)
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def key_event(self):
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"""
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Process a key press event, mapping keys to appropriate mouse clicks.
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"""
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event = self.events[-1]
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if event.key is None:
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# At least in OSX gtk backend some keys return None.
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return
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key = event.key.lower()
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if key in ['backspace', 'delete']:
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self.mouse_event_pop(event)
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elif key in ['escape', 'enter']:
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self.mouse_event_stop(event)
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else:
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self.mouse_event_add(event)
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def mouse_event_add(self, event):
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"""
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Process an button-1 event (add a click if inside axes).
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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if event.inaxes:
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self.add_click(event)
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else: # If not a valid click, remove from event list.
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BlockingInput.pop(self)
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def mouse_event_stop(self, event):
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"""
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Process an button-2 event (end blocking input).
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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# Remove last event just for cleanliness.
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BlockingInput.pop(self)
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# This will exit even if not in infinite mode. This is consistent with
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# MATLAB and sometimes quite useful, but will require the user to test
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# how many points were actually returned before using data.
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self.fig.canvas.stop_event_loop()
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def mouse_event_pop(self, event):
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"""
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Process an button-3 event (remove the last click).
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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# Remove this last event.
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BlockingInput.pop(self)
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# Now remove any existing clicks if possible.
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if self.events:
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self.pop(event)
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def add_click(self, event):
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"""
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Add the coordinates of an event to the list of clicks.
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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self.clicks.append((event.xdata, event.ydata))
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_log.info("input %i: %f, %f",
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len(self.clicks), event.xdata, event.ydata)
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# If desired, plot up click.
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if self.show_clicks:
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line = mlines.Line2D([event.xdata], [event.ydata],
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marker='+', color='r')
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event.inaxes.add_line(line)
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self.marks.append(line)
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self.fig.canvas.draw()
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def pop_click(self, event, index=-1):
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"""
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Remove a click (by default, the last) from the list of clicks.
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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self.clicks.pop(index)
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if self.show_clicks:
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self.marks.pop(index).remove()
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self.fig.canvas.draw()
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def pop(self, event, index=-1):
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"""
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Removes a click and the associated event from the list of clicks.
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Defaults to the last click.
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"""
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self.pop_click(event, index)
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BlockingInput.pop(self, index)
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def cleanup(self, event=None):
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"""
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`, optional
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Not used
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"""
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# Clean the figure.
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if self.show_clicks:
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for mark in self.marks:
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mark.remove()
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self.marks = []
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self.fig.canvas.draw()
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# Call base class to remove callbacks.
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BlockingInput.cleanup(self)
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def __call__(self, n=1, timeout=30, show_clicks=True):
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"""
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Blocking call to retrieve *n* coordinate pairs through mouse clicks.
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"""
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self.show_clicks = show_clicks
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self.clicks = []
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self.marks = []
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BlockingInput.__call__(self, n=n, timeout=timeout)
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return self.clicks
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class BlockingContourLabeler(BlockingMouseInput):
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"""
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Callable for retrieving mouse clicks and key presses in a blocking way.
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Used to place contour labels.
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"""
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def __init__(self, cs):
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self.cs = cs
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BlockingMouseInput.__init__(self, fig=cs.ax.figure)
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def add_click(self, event):
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self.button1(event)
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def pop_click(self, event, index=-1):
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self.button3(event)
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def button1(self, event):
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"""
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Process an button-1 event (add a label to a contour).
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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# Shorthand
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if event.inaxes == self.cs.ax:
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self.cs.add_label_near(event.x, event.y, self.inline,
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inline_spacing=self.inline_spacing,
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transform=False)
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self.fig.canvas.draw()
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else: # Remove event if not valid
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BlockingInput.pop(self)
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def button3(self, event):
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"""
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Process an button-3 event (remove a label if not in inline mode).
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Unfortunately, if one is doing inline labels, then there is currently
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no way to fix the broken contour - once humpty-dumpty is broken, he
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can't be put back together. In inline mode, this does nothing.
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Parameters
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----------
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event : `~.backend_bases.MouseEvent`
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"""
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if self.inline:
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pass
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else:
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self.cs.pop_label()
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self.cs.ax.figure.canvas.draw()
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def __call__(self, inline, inline_spacing=5, n=-1, timeout=-1):
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self.inline = inline
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self.inline_spacing = inline_spacing
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BlockingMouseInput.__call__(self, n=n, timeout=timeout,
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show_clicks=False)
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class BlockingKeyMouseInput(BlockingInput):
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"""
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Callable for retrieving mouse clicks and key presses in a blocking way.
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"""
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def __init__(self, fig):
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BlockingInput.__init__(self, fig=fig, eventslist=(
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'button_press_event', 'key_press_event'))
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def post_event(self):
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"""Determine if it is a key event."""
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if self.events:
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self.keyormouse = self.events[-1].name == 'key_press_event'
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else:
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_log.warning("No events yet.")
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def __call__(self, timeout=30):
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"""
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Blocking call to retrieve a single mouse click or key press.
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Returns ``True`` if key press, ``False`` if mouse click, or ``None`` if
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timed out.
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"""
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self.keyormouse = None
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BlockingInput.__call__(self, n=1, timeout=timeout)
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return self.keyormouse
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