|
|
"""A matplotlib backend for publishing figures via display_data"""
|
|
|
|
|
|
# Copyright (c) IPython Development Team.
|
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
from __future__ import print_function
|
|
|
|
|
|
import matplotlib
|
|
|
from matplotlib.backends.backend_agg import new_figure_manager, FigureCanvasAgg # analysis: ignore
|
|
|
from matplotlib._pylab_helpers import Gcf
|
|
|
|
|
|
from IPython.core.getipython import get_ipython
|
|
|
from IPython.core.display import display
|
|
|
|
|
|
from .config import InlineBackend
|
|
|
|
|
|
|
|
|
def show(close=None):
|
|
|
"""Show all figures as SVG/PNG payloads sent to the IPython clients.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
close : bool, optional
|
|
|
If true, a ``plt.close('all')`` call is automatically issued after
|
|
|
sending all the figures. If this is set, the figures will entirely
|
|
|
removed from the internal list of figures.
|
|
|
"""
|
|
|
if close is None:
|
|
|
close = InlineBackend.instance().close_figures
|
|
|
try:
|
|
|
for figure_manager in Gcf.get_all_fig_managers():
|
|
|
display(figure_manager.canvas.figure)
|
|
|
finally:
|
|
|
show._to_draw = []
|
|
|
# only call close('all') if any to close
|
|
|
# close triggers gc.collect, which can be slow
|
|
|
if close and Gcf.get_all_fig_managers():
|
|
|
matplotlib.pyplot.close('all')
|
|
|
|
|
|
|
|
|
# This flag will be reset by draw_if_interactive when called
|
|
|
show._draw_called = False
|
|
|
# list of figures to draw when flush_figures is called
|
|
|
show._to_draw = []
|
|
|
|
|
|
|
|
|
def draw_if_interactive():
|
|
|
"""
|
|
|
Is called after every pylab drawing command
|
|
|
"""
|
|
|
# signal that the current active figure should be sent at the end of
|
|
|
# execution. Also sets the _draw_called flag, signaling that there will be
|
|
|
# something to send. At the end of the code execution, a separate call to
|
|
|
# flush_figures() will act upon these values
|
|
|
manager = Gcf.get_active()
|
|
|
if manager is None:
|
|
|
return
|
|
|
fig = manager.canvas.figure
|
|
|
|
|
|
# Hack: matplotlib FigureManager objects in interacive backends (at least
|
|
|
# in some of them) monkeypatch the figure object and add a .show() method
|
|
|
# to it. This applies the same monkeypatch in order to support user code
|
|
|
# that might expect `.show()` to be part of the official API of figure
|
|
|
# objects.
|
|
|
# For further reference:
|
|
|
# https://github.com/ipython/ipython/issues/1612
|
|
|
# https://github.com/matplotlib/matplotlib/issues/835
|
|
|
|
|
|
if not hasattr(fig, 'show'):
|
|
|
# Queue up `fig` for display
|
|
|
fig.show = lambda *a: display(fig)
|
|
|
|
|
|
# If matplotlib was manually set to non-interactive mode, this function
|
|
|
# should be a no-op (otherwise we'll generate duplicate plots, since a user
|
|
|
# who set ioff() manually expects to make separate draw/show calls).
|
|
|
if not matplotlib.is_interactive():
|
|
|
return
|
|
|
|
|
|
# ensure current figure will be drawn, and each subsequent call
|
|
|
# of draw_if_interactive() moves the active figure to ensure it is
|
|
|
# drawn last
|
|
|
try:
|
|
|
show._to_draw.remove(fig)
|
|
|
except ValueError:
|
|
|
# ensure it only appears in the draw list once
|
|
|
pass
|
|
|
# Queue up the figure for drawing in next show() call
|
|
|
show._to_draw.append(fig)
|
|
|
show._draw_called = True
|
|
|
|
|
|
|
|
|
def flush_figures():
|
|
|
"""Send all figures that changed
|
|
|
|
|
|
This is meant to be called automatically and will call show() if, during
|
|
|
prior code execution, there had been any calls to draw_if_interactive.
|
|
|
|
|
|
This function is meant to be used as a post_execute callback in IPython,
|
|
|
so user-caused errors are handled with showtraceback() instead of being
|
|
|
allowed to raise. If this function is not called from within IPython,
|
|
|
then these exceptions will raise.
|
|
|
"""
|
|
|
if not show._draw_called:
|
|
|
return
|
|
|
|
|
|
if InlineBackend.instance().close_figures:
|
|
|
# ignore the tracking, just draw and close all figures
|
|
|
try:
|
|
|
return show(True)
|
|
|
except Exception as e:
|
|
|
# safely show traceback if in IPython, else raise
|
|
|
ip = get_ipython()
|
|
|
if ip is None:
|
|
|
raise e
|
|
|
else:
|
|
|
ip.showtraceback()
|
|
|
return
|
|
|
try:
|
|
|
# exclude any figures that were closed:
|
|
|
active = set([fm.canvas.figure for fm in Gcf.get_all_fig_managers()])
|
|
|
for fig in [ fig for fig in show._to_draw if fig in active ]:
|
|
|
try:
|
|
|
display(fig)
|
|
|
except Exception as e:
|
|
|
# safely show traceback if in IPython, else raise
|
|
|
ip = get_ipython()
|
|
|
if ip is None:
|
|
|
raise e
|
|
|
else:
|
|
|
ip.showtraceback()
|
|
|
return
|
|
|
finally:
|
|
|
# clear flags for next round
|
|
|
show._to_draw = []
|
|
|
show._draw_called = False
|
|
|
|
|
|
|
|
|
# Changes to matplotlib in version 1.2 requires a mpl backend to supply a default
|
|
|
# figurecanvas. This is set here to a Agg canvas
|
|
|
# See https://github.com/matplotlib/matplotlib/pull/1125
|
|
|
FigureCanvas = FigureCanvasAgg
|
|
|
|