|
|
# -*- coding: utf-8 -*-
|
|
|
"""Pylab (matplotlib) support utilities."""
|
|
|
from __future__ import print_function
|
|
|
|
|
|
# Copyright (c) IPython Development Team.
|
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
from io import BytesIO
|
|
|
|
|
|
from IPython.core.display import _pngxy
|
|
|
from IPython.utils.decorators import flag_calls
|
|
|
from IPython.utils import py3compat
|
|
|
|
|
|
# If user specifies a GUI, that dictates the backend, otherwise we read the
|
|
|
# user's mpl default from the mpl rc structure
|
|
|
backends = {'tk': 'TkAgg',
|
|
|
'gtk': 'GTKAgg',
|
|
|
'gtk3': 'GTK3Agg',
|
|
|
'wx': 'WXAgg',
|
|
|
'qt': 'Qt4Agg', # qt3 not supported
|
|
|
'qt4': 'Qt4Agg',
|
|
|
'qt5': 'Qt5Agg',
|
|
|
'osx': 'MacOSX',
|
|
|
'nbagg': 'nbAgg',
|
|
|
'notebook': 'nbAgg',
|
|
|
'inline' : 'module://ipykernel.pylab.backend_inline'}
|
|
|
|
|
|
# We also need a reverse backends2guis mapping that will properly choose which
|
|
|
# GUI support to activate based on the desired matplotlib backend. For the
|
|
|
# most part it's just a reverse of the above dict, but we also need to add a
|
|
|
# few others that map to the same GUI manually:
|
|
|
backend2gui = dict(zip(backends.values(), backends.keys()))
|
|
|
# Our tests expect backend2gui to just return 'qt'
|
|
|
backend2gui['Qt4Agg'] = 'qt'
|
|
|
# In the reverse mapping, there are a few extra valid matplotlib backends that
|
|
|
# map to the same GUI support
|
|
|
backend2gui['GTK'] = backend2gui['GTKCairo'] = 'gtk'
|
|
|
backend2gui['GTK3Cairo'] = 'gtk3'
|
|
|
backend2gui['WX'] = 'wx'
|
|
|
backend2gui['CocoaAgg'] = 'osx'
|
|
|
# And some backends that don't need GUI integration
|
|
|
del backend2gui['nbAgg']
|
|
|
del backend2gui['agg']
|
|
|
del backend2gui['module://ipykernel.pylab.backend_inline']
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Matplotlib utilities
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
def getfigs(*fig_nums):
|
|
|
"""Get a list of matplotlib figures by figure numbers.
|
|
|
|
|
|
If no arguments are given, all available figures are returned. If the
|
|
|
argument list contains references to invalid figures, a warning is printed
|
|
|
but the function continues pasting further figures.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
figs : tuple
|
|
|
A tuple of ints giving the figure numbers of the figures to return.
|
|
|
"""
|
|
|
from matplotlib._pylab_helpers import Gcf
|
|
|
if not fig_nums:
|
|
|
fig_managers = Gcf.get_all_fig_managers()
|
|
|
return [fm.canvas.figure for fm in fig_managers]
|
|
|
else:
|
|
|
figs = []
|
|
|
for num in fig_nums:
|
|
|
f = Gcf.figs.get(num)
|
|
|
if f is None:
|
|
|
print('Warning: figure %s not available.' % num)
|
|
|
else:
|
|
|
figs.append(f.canvas.figure)
|
|
|
return figs
|
|
|
|
|
|
|
|
|
def figsize(sizex, sizey):
|
|
|
"""Set the default figure size to be [sizex, sizey].
|
|
|
|
|
|
This is just an easy to remember, convenience wrapper that sets::
|
|
|
|
|
|
matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
|
|
|
"""
|
|
|
import matplotlib
|
|
|
matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
|
|
|
|
|
|
|
|
|
def print_figure(fig, fmt='png', bbox_inches='tight', **kwargs):
|
|
|
"""Print a figure to an image, and return the resulting file data
|
|
|
|
|
|
Returned data will be bytes unless ``fmt='svg'``,
|
|
|
in which case it will be unicode.
|
|
|
|
|
|
Any keyword args are passed to fig.canvas.print_figure,
|
|
|
such as ``quality`` or ``bbox_inches``.
|
|
|
"""
|
|
|
from matplotlib import rcParams
|
|
|
# When there's an empty figure, we shouldn't return anything, otherwise we
|
|
|
# get big blank areas in the qt console.
|
|
|
if not fig.axes and not fig.lines:
|
|
|
return
|
|
|
|
|
|
dpi = fig.dpi
|
|
|
if fmt == 'retina':
|
|
|
dpi = dpi * 2
|
|
|
fmt = 'png'
|
|
|
|
|
|
# build keyword args
|
|
|
kw = dict(
|
|
|
format=fmt,
|
|
|
facecolor=fig.get_facecolor(),
|
|
|
edgecolor=fig.get_edgecolor(),
|
|
|
dpi=dpi,
|
|
|
bbox_inches=bbox_inches,
|
|
|
)
|
|
|
# **kwargs get higher priority
|
|
|
kw.update(kwargs)
|
|
|
|
|
|
bytes_io = BytesIO()
|
|
|
fig.canvas.print_figure(bytes_io, **kw)
|
|
|
data = bytes_io.getvalue()
|
|
|
if fmt == 'svg':
|
|
|
data = data.decode('utf-8')
|
|
|
return data
|
|
|
|
|
|
def retina_figure(fig, **kwargs):
|
|
|
"""format a figure as a pixel-doubled (retina) PNG"""
|
|
|
pngdata = print_figure(fig, fmt='retina', **kwargs)
|
|
|
# Make sure that retina_figure acts just like print_figure and returns
|
|
|
# None when the figure is empty.
|
|
|
if pngdata is None:
|
|
|
return
|
|
|
w, h = _pngxy(pngdata)
|
|
|
metadata = dict(width=w//2, height=h//2)
|
|
|
return pngdata, metadata
|
|
|
|
|
|
# We need a little factory function here to create the closure where
|
|
|
# safe_execfile can live.
|
|
|
def mpl_runner(safe_execfile):
|
|
|
"""Factory to return a matplotlib-enabled runner for %run.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
safe_execfile : function
|
|
|
This must be a function with the same interface as the
|
|
|
:meth:`safe_execfile` method of IPython.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
A function suitable for use as the ``runner`` argument of the %run magic
|
|
|
function.
|
|
|
"""
|
|
|
|
|
|
def mpl_execfile(fname,*where,**kw):
|
|
|
"""matplotlib-aware wrapper around safe_execfile.
|
|
|
|
|
|
Its interface is identical to that of the :func:`execfile` builtin.
|
|
|
|
|
|
This is ultimately a call to execfile(), but wrapped in safeties to
|
|
|
properly handle interactive rendering."""
|
|
|
|
|
|
import matplotlib
|
|
|
import matplotlib.pylab as pylab
|
|
|
|
|
|
#print '*** Matplotlib runner ***' # dbg
|
|
|
# turn off rendering until end of script
|
|
|
is_interactive = matplotlib.rcParams['interactive']
|
|
|
matplotlib.interactive(False)
|
|
|
safe_execfile(fname,*where,**kw)
|
|
|
matplotlib.interactive(is_interactive)
|
|
|
# make rendering call now, if the user tried to do it
|
|
|
if pylab.draw_if_interactive.called:
|
|
|
pylab.draw()
|
|
|
pylab.draw_if_interactive.called = False
|
|
|
|
|
|
return mpl_execfile
|
|
|
|
|
|
|
|
|
def _reshow_nbagg_figure(fig):
|
|
|
"""reshow an nbagg figure"""
|
|
|
try:
|
|
|
reshow = fig.canvas.manager.reshow
|
|
|
except AttributeError:
|
|
|
raise NotImplementedError()
|
|
|
else:
|
|
|
reshow()
|
|
|
|
|
|
|
|
|
def select_figure_formats(shell, formats, **kwargs):
|
|
|
"""Select figure formats for the inline backend.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
shell : InteractiveShell
|
|
|
The main IPython instance.
|
|
|
formats : str or set
|
|
|
One or a set of figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
|
|
|
**kwargs : any
|
|
|
Extra keyword arguments to be passed to fig.canvas.print_figure.
|
|
|
"""
|
|
|
import matplotlib
|
|
|
from matplotlib.figure import Figure
|
|
|
|
|
|
svg_formatter = shell.display_formatter.formatters['image/svg+xml']
|
|
|
png_formatter = shell.display_formatter.formatters['image/png']
|
|
|
jpg_formatter = shell.display_formatter.formatters['image/jpeg']
|
|
|
pdf_formatter = shell.display_formatter.formatters['application/pdf']
|
|
|
|
|
|
if isinstance(formats, py3compat.string_types):
|
|
|
formats = {formats}
|
|
|
# cast in case of list / tuple
|
|
|
formats = set(formats)
|
|
|
|
|
|
[ f.pop(Figure, None) for f in shell.display_formatter.formatters.values() ]
|
|
|
|
|
|
if matplotlib.get_backend().lower() == 'nbagg':
|
|
|
formatter = shell.display_formatter.ipython_display_formatter
|
|
|
formatter.for_type(Figure, _reshow_nbagg_figure)
|
|
|
|
|
|
supported = {'png', 'png2x', 'retina', 'jpg', 'jpeg', 'svg', 'pdf'}
|
|
|
bad = formats.difference(supported)
|
|
|
if bad:
|
|
|
bs = "%s" % ','.join([repr(f) for f in bad])
|
|
|
gs = "%s" % ','.join([repr(f) for f in supported])
|
|
|
raise ValueError("supported formats are: %s not %s" % (gs, bs))
|
|
|
|
|
|
if 'png' in formats:
|
|
|
png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
|
|
|
if 'retina' in formats or 'png2x' in formats:
|
|
|
png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))
|
|
|
if 'jpg' in formats or 'jpeg' in formats:
|
|
|
jpg_formatter.for_type(Figure, lambda fig: print_figure(fig, 'jpg', **kwargs))
|
|
|
if 'svg' in formats:
|
|
|
svg_formatter.for_type(Figure, lambda fig: print_figure(fig, 'svg', **kwargs))
|
|
|
if 'pdf' in formats:
|
|
|
pdf_formatter.for_type(Figure, lambda fig: print_figure(fig, 'pdf', **kwargs))
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Code for initializing matplotlib and importing pylab
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
def find_gui_and_backend(gui=None, gui_select=None):
|
|
|
"""Given a gui string return the gui and mpl backend.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
gui : str
|
|
|
Can be one of ('tk','gtk','wx','qt','qt4','inline').
|
|
|
gui_select : str
|
|
|
Can be one of ('tk','gtk','wx','qt','qt4','inline').
|
|
|
This is any gui already selected by the shell.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
A tuple of (gui, backend) where backend is one of ('TkAgg','GTKAgg',
|
|
|
'WXAgg','Qt4Agg','module://ipykernel.pylab.backend_inline').
|
|
|
"""
|
|
|
|
|
|
import matplotlib
|
|
|
|
|
|
if gui and gui != 'auto':
|
|
|
# select backend based on requested gui
|
|
|
backend = backends[gui]
|
|
|
else:
|
|
|
# We need to read the backend from the original data structure, *not*
|
|
|
# from mpl.rcParams, since a prior invocation of %matplotlib may have
|
|
|
# overwritten that.
|
|
|
# WARNING: this assumes matplotlib 1.1 or newer!!
|
|
|
backend = matplotlib.rcParamsOrig['backend']
|
|
|
# In this case, we need to find what the appropriate gui selection call
|
|
|
# should be for IPython, so we can activate inputhook accordingly
|
|
|
gui = backend2gui.get(backend, None)
|
|
|
|
|
|
# If we have already had a gui active, we need it and inline are the
|
|
|
# ones allowed.
|
|
|
if gui_select and gui != gui_select:
|
|
|
gui = gui_select
|
|
|
backend = backends[gui]
|
|
|
|
|
|
return gui, backend
|
|
|
|
|
|
|
|
|
def activate_matplotlib(backend):
|
|
|
"""Activate the given backend and set interactive to True."""
|
|
|
|
|
|
import matplotlib
|
|
|
matplotlib.interactive(True)
|
|
|
|
|
|
# Matplotlib had a bug where even switch_backend could not force
|
|
|
# the rcParam to update. This needs to be set *before* the module
|
|
|
# magic of switch_backend().
|
|
|
matplotlib.rcParams['backend'] = backend
|
|
|
|
|
|
import matplotlib.pyplot
|
|
|
matplotlib.pyplot.switch_backend(backend)
|
|
|
|
|
|
# This must be imported last in the matplotlib series, after
|
|
|
# backend/interactivity choices have been made
|
|
|
import matplotlib.pylab as pylab
|
|
|
|
|
|
pylab.show._needmain = False
|
|
|
# We need to detect at runtime whether show() is called by the user.
|
|
|
# For this, we wrap it into a decorator which adds a 'called' flag.
|
|
|
pylab.draw_if_interactive = flag_calls(pylab.draw_if_interactive)
|
|
|
|
|
|
|
|
|
def import_pylab(user_ns, import_all=True):
|
|
|
"""Populate the namespace with pylab-related values.
|
|
|
|
|
|
Imports matplotlib, pylab, numpy, and everything from pylab and numpy.
|
|
|
|
|
|
Also imports a few names from IPython (figsize, display, getfigs)
|
|
|
|
|
|
"""
|
|
|
|
|
|
# Import numpy as np/pyplot as plt are conventions we're trying to
|
|
|
# somewhat standardize on. Making them available to users by default
|
|
|
# will greatly help this.
|
|
|
s = ("import numpy\n"
|
|
|
"import matplotlib\n"
|
|
|
"from matplotlib import pylab, mlab, pyplot\n"
|
|
|
"np = numpy\n"
|
|
|
"plt = pyplot\n"
|
|
|
)
|
|
|
exec(s, user_ns)
|
|
|
|
|
|
if import_all:
|
|
|
s = ("from matplotlib.pylab import *\n"
|
|
|
"from numpy import *\n")
|
|
|
exec(s, user_ns)
|
|
|
|
|
|
# IPython symbols to add
|
|
|
user_ns['figsize'] = figsize
|
|
|
from IPython.core.display import display
|
|
|
# Add display and getfigs to the user's namespace
|
|
|
user_ns['display'] = display
|
|
|
user_ns['getfigs'] = getfigs
|
|
|
|
|
|
|
|
|
def configure_inline_support(shell, backend):
|
|
|
"""Configure an IPython shell object for matplotlib use.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
shell : InteractiveShell instance
|
|
|
|
|
|
backend : matplotlib backend
|
|
|
"""
|
|
|
# If using our svg payload backend, register the post-execution
|
|
|
# function that will pick up the results for display. This can only be
|
|
|
# done with access to the real shell object.
|
|
|
|
|
|
# Note: if we can't load the inline backend, then there's no point
|
|
|
# continuing (such as in terminal-only shells in environments without
|
|
|
# zeromq available).
|
|
|
try:
|
|
|
from ipykernel.pylab.backend_inline import InlineBackend
|
|
|
except ImportError:
|
|
|
return
|
|
|
import matplotlib
|
|
|
|
|
|
cfg = InlineBackend.instance(parent=shell)
|
|
|
cfg.shell = shell
|
|
|
if cfg not in shell.configurables:
|
|
|
shell.configurables.append(cfg)
|
|
|
|
|
|
if backend == backends['inline']:
|
|
|
from ipykernel.pylab.backend_inline import flush_figures
|
|
|
shell.events.register('post_execute', flush_figures)
|
|
|
|
|
|
# Save rcParams that will be overwrittern
|
|
|
shell._saved_rcParams = dict()
|
|
|
for k in cfg.rc:
|
|
|
shell._saved_rcParams[k] = matplotlib.rcParams[k]
|
|
|
# load inline_rc
|
|
|
matplotlib.rcParams.update(cfg.rc)
|
|
|
new_backend_name = "inline"
|
|
|
else:
|
|
|
from ipykernel.pylab.backend_inline import flush_figures
|
|
|
try:
|
|
|
shell.events.unregister('post_execute', flush_figures)
|
|
|
except ValueError:
|
|
|
pass
|
|
|
if hasattr(shell, '_saved_rcParams'):
|
|
|
matplotlib.rcParams.update(shell._saved_rcParams)
|
|
|
del shell._saved_rcParams
|
|
|
new_backend_name = "other"
|
|
|
|
|
|
# only enable the formats once -> don't change the enabled formats (which the user may
|
|
|
# has changed) when getting another "%matplotlib inline" call.
|
|
|
# See https://github.com/ipython/ipykernel/issues/29
|
|
|
cur_backend = getattr(configure_inline_support, "current_backend", "unset")
|
|
|
if new_backend_name != cur_backend:
|
|
|
# Setup the default figure format
|
|
|
select_figure_formats(shell, cfg.figure_formats, **cfg.print_figure_kwargs)
|
|
|
configure_inline_support.current_backend = new_backend_name
|
|
|
|
