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