455 lines
17 KiB
Python
455 lines
17 KiB
Python
r"""
|
|
This module supports embedded TeX expressions in matplotlib via dvipng
|
|
and dvips for the raster and postscript backends. The tex and
|
|
dvipng/dvips information is cached in ~/.matplotlib/tex.cache for reuse between
|
|
sessions
|
|
|
|
Requirements:
|
|
|
|
* latex
|
|
* \*Agg backends: dvipng>=1.6
|
|
* PS backend: psfrag, dvips, and Ghostscript>=8.60
|
|
|
|
Backends:
|
|
|
|
* \*Agg
|
|
* PS
|
|
* PDF
|
|
|
|
For raster output, you can get RGBA numpy arrays from TeX expressions
|
|
as follows::
|
|
|
|
texmanager = TexManager()
|
|
s = ('\TeX\ is Number '
|
|
'$\displaystyle\sum_{n=1}^\infty\frac{-e^{i\pi}}{2^n}$!')
|
|
Z = texmanager.get_rgba(s, fontsize=12, dpi=80, rgb=(1, 0, 0))
|
|
|
|
To enable tex rendering of all text in your matplotlib figure, set
|
|
:rc:`text.usetex` to True.
|
|
"""
|
|
|
|
import copy
|
|
import functools
|
|
import glob
|
|
import hashlib
|
|
import logging
|
|
import os
|
|
from pathlib import Path
|
|
import re
|
|
import subprocess
|
|
|
|
import numpy as np
|
|
|
|
import matplotlib as mpl
|
|
from matplotlib import cbook, dviread, rcParams
|
|
|
|
_log = logging.getLogger(__name__)
|
|
|
|
|
|
class TexManager:
|
|
"""
|
|
Convert strings to dvi files using TeX, caching the results to a directory.
|
|
|
|
Repeated calls to this constructor always return the same instance.
|
|
"""
|
|
|
|
cachedir = mpl.get_cachedir()
|
|
if cachedir is not None:
|
|
texcache = os.path.join(cachedir, 'tex.cache')
|
|
Path(texcache).mkdir(parents=True, exist_ok=True)
|
|
else:
|
|
# Should only happen in a restricted environment (such as Google App
|
|
# Engine). Deal with this gracefully by not creating a cache directory.
|
|
texcache = None
|
|
|
|
# Caches.
|
|
rgba_arrayd = {}
|
|
grey_arrayd = {}
|
|
|
|
serif = ('cmr', '')
|
|
sans_serif = ('cmss', '')
|
|
monospace = ('cmtt', '')
|
|
cursive = ('pzc', r'\usepackage{chancery}')
|
|
font_family = 'serif'
|
|
font_families = ('serif', 'sans-serif', 'cursive', 'monospace')
|
|
|
|
font_info = {
|
|
'new century schoolbook': ('pnc', r'\renewcommand{\rmdefault}{pnc}'),
|
|
'bookman': ('pbk', r'\renewcommand{\rmdefault}{pbk}'),
|
|
'times': ('ptm', r'\usepackage{mathptmx}'),
|
|
'palatino': ('ppl', r'\usepackage{mathpazo}'),
|
|
'zapf chancery': ('pzc', r'\usepackage{chancery}'),
|
|
'cursive': ('pzc', r'\usepackage{chancery}'),
|
|
'charter': ('pch', r'\usepackage{charter}'),
|
|
'serif': ('cmr', ''),
|
|
'sans-serif': ('cmss', ''),
|
|
'helvetica': ('phv', r'\usepackage{helvet}'),
|
|
'avant garde': ('pag', r'\usepackage{avant}'),
|
|
'courier': ('pcr', r'\usepackage{courier}'),
|
|
# Loading the type1ec package ensures that cm-super is installed, which
|
|
# is necessary for unicode computer modern. (It also allows the use of
|
|
# computer modern at arbitrary sizes, but that's just a side effect.)
|
|
'monospace': ('cmtt', r'\usepackage{type1ec}'),
|
|
'computer modern roman': ('cmr', r'\usepackage{type1ec}'),
|
|
'computer modern sans serif': ('cmss', r'\usepackage{type1ec}'),
|
|
'computer modern typewriter': ('cmtt', r'\usepackage{type1ec}')}
|
|
|
|
_rc_cache = None
|
|
_rc_cache_keys = (
|
|
('text.latex.preamble', 'text.latex.unicode', 'text.latex.preview',
|
|
'font.family') + tuple('font.' + n for n in font_families))
|
|
|
|
@functools.lru_cache() # Always return the same instance.
|
|
def __new__(cls):
|
|
self = object.__new__(cls)
|
|
self._reinit()
|
|
return self
|
|
|
|
def _reinit(self):
|
|
if self.texcache is None:
|
|
raise RuntimeError('Cannot create TexManager, as there is no '
|
|
'cache directory available')
|
|
|
|
Path(self.texcache).mkdir(parents=True, exist_ok=True)
|
|
ff = rcParams['font.family']
|
|
if len(ff) == 1 and ff[0].lower() in self.font_families:
|
|
self.font_family = ff[0].lower()
|
|
elif isinstance(ff, str) and ff.lower() in self.font_families:
|
|
self.font_family = ff.lower()
|
|
else:
|
|
_log.info('font.family must be one of (%s) when text.usetex is '
|
|
'True. serif will be used by default.',
|
|
', '.join(self.font_families))
|
|
self.font_family = 'serif'
|
|
|
|
fontconfig = [self.font_family]
|
|
for font_family in self.font_families:
|
|
font_family_attr = font_family.replace('-', '_')
|
|
for font in rcParams['font.' + font_family]:
|
|
if font.lower() in self.font_info:
|
|
setattr(self, font_family_attr,
|
|
self.font_info[font.lower()])
|
|
_log.debug('family: %s, font: %s, info: %s',
|
|
font_family, font, self.font_info[font.lower()])
|
|
break
|
|
else:
|
|
_log.debug('%s font is not compatible with usetex.',
|
|
font_family)
|
|
else:
|
|
_log.info('No LaTeX-compatible font found for the %s font '
|
|
'family in rcParams. Using default.', font_family)
|
|
setattr(self, font_family_attr, self.font_info[font_family])
|
|
fontconfig.append(getattr(self, font_family_attr)[0])
|
|
# Add a hash of the latex preamble to self._fontconfig so that the
|
|
# correct png is selected for strings rendered with same font and dpi
|
|
# even if the latex preamble changes within the session
|
|
preamble_bytes = self.get_custom_preamble().encode('utf-8')
|
|
fontconfig.append(hashlib.md5(preamble_bytes).hexdigest())
|
|
self._fontconfig = ''.join(fontconfig)
|
|
|
|
# The following packages and commands need to be included in the latex
|
|
# file's preamble:
|
|
cmd = [self.serif[1], self.sans_serif[1], self.monospace[1]]
|
|
if self.font_family == 'cursive':
|
|
cmd.append(self.cursive[1])
|
|
self._font_preamble = '\n'.join(
|
|
[r'\usepackage{type1cm}'] + cmd + [r'\usepackage{textcomp}'])
|
|
|
|
def get_basefile(self, tex, fontsize, dpi=None):
|
|
"""
|
|
Return a filename based on a hash of the string, fontsize, and dpi.
|
|
"""
|
|
s = ''.join([tex, self.get_font_config(), '%f' % fontsize,
|
|
self.get_custom_preamble(), str(dpi or '')])
|
|
return os.path.join(
|
|
self.texcache, hashlib.md5(s.encode('utf-8')).hexdigest())
|
|
|
|
def get_font_config(self):
|
|
"""Reinitializes self if relevant rcParams on have changed."""
|
|
if self._rc_cache is None:
|
|
self._rc_cache = dict.fromkeys(self._rc_cache_keys)
|
|
changed = [par for par in self._rc_cache_keys
|
|
if rcParams[par] != self._rc_cache[par]]
|
|
if changed:
|
|
_log.debug('following keys changed: %s', changed)
|
|
for k in changed:
|
|
_log.debug('%-20s: %-10s -> %-10s',
|
|
k, self._rc_cache[k], rcParams[k])
|
|
# deepcopy may not be necessary, but feels more future-proof
|
|
self._rc_cache[k] = copy.deepcopy(rcParams[k])
|
|
_log.debug('RE-INIT\nold fontconfig: %s', self._fontconfig)
|
|
self._reinit()
|
|
_log.debug('fontconfig: %s', self._fontconfig)
|
|
return self._fontconfig
|
|
|
|
def get_font_preamble(self):
|
|
"""
|
|
Return a string containing font configuration for the tex preamble.
|
|
"""
|
|
return self._font_preamble
|
|
|
|
def get_custom_preamble(self):
|
|
"""Return a string containing user additions to the tex preamble."""
|
|
return rcParams['text.latex.preamble']
|
|
|
|
def make_tex(self, tex, fontsize):
|
|
"""
|
|
Generate a tex file to render the tex string at a specific font size.
|
|
|
|
Return the file name.
|
|
"""
|
|
basefile = self.get_basefile(tex, fontsize)
|
|
texfile = '%s.tex' % basefile
|
|
custom_preamble = self.get_custom_preamble()
|
|
fontcmd = {'sans-serif': r'{\sffamily %s}',
|
|
'monospace': r'{\ttfamily %s}'}.get(self.font_family,
|
|
r'{\rmfamily %s}')
|
|
tex = fontcmd % tex
|
|
|
|
unicode_preamble = "\n".join([
|
|
r"\usepackage[utf8]{inputenc}",
|
|
r"\DeclareUnicodeCharacter{2212}{\ensuremath{-}}",
|
|
]) if rcParams["text.latex.unicode"] else ""
|
|
|
|
s = r"""
|
|
\documentclass{article}
|
|
%s
|
|
%s
|
|
%s
|
|
\usepackage[papersize={72in,72in},body={70in,70in},margin={1in,1in}]{geometry}
|
|
\pagestyle{empty}
|
|
\begin{document}
|
|
\fontsize{%f}{%f}%s
|
|
\end{document}
|
|
""" % (self._font_preamble, unicode_preamble, custom_preamble,
|
|
fontsize, fontsize * 1.25, tex)
|
|
with open(texfile, 'wb') as fh:
|
|
if rcParams['text.latex.unicode']:
|
|
fh.write(s.encode('utf8'))
|
|
else:
|
|
try:
|
|
fh.write(s.encode('ascii'))
|
|
except UnicodeEncodeError:
|
|
_log.info("You are using unicode and latex, but have not "
|
|
"enabled the 'text.latex.unicode' rcParam.")
|
|
raise
|
|
|
|
return texfile
|
|
|
|
_re_vbox = re.compile(
|
|
r"MatplotlibBox:\(([\d.]+)pt\+([\d.]+)pt\)x([\d.]+)pt")
|
|
|
|
def make_tex_preview(self, tex, fontsize):
|
|
"""
|
|
Generate a tex file to render the tex string at a specific font size.
|
|
|
|
It uses the preview.sty to determine the dimension (width, height,
|
|
descent) of the output.
|
|
|
|
Return the file name.
|
|
"""
|
|
basefile = self.get_basefile(tex, fontsize)
|
|
texfile = '%s.tex' % basefile
|
|
custom_preamble = self.get_custom_preamble()
|
|
fontcmd = {'sans-serif': r'{\sffamily %s}',
|
|
'monospace': r'{\ttfamily %s}'}.get(self.font_family,
|
|
r'{\rmfamily %s}')
|
|
tex = fontcmd % tex
|
|
|
|
unicode_preamble = "\n".join([
|
|
r"\usepackage[utf8]{inputenc}",
|
|
r"\DeclareUnicodeCharacter{2212}{\ensuremath{-}}",
|
|
]) if rcParams["text.latex.unicode"] else ""
|
|
|
|
# newbox, setbox, immediate, etc. are used to find the box
|
|
# extent of the rendered text.
|
|
|
|
s = r"""
|
|
\documentclass{article}
|
|
%s
|
|
%s
|
|
%s
|
|
\usepackage[active,showbox,tightpage]{preview}
|
|
\usepackage[papersize={72in,72in},body={70in,70in},margin={1in,1in}]{geometry}
|
|
|
|
%% we override the default showbox as it is treated as an error and makes
|
|
%% the exit status not zero
|
|
\def\showbox#1%%
|
|
{\immediate\write16{MatplotlibBox:(\the\ht#1+\the\dp#1)x\the\wd#1}}
|
|
|
|
\begin{document}
|
|
\begin{preview}
|
|
{\fontsize{%f}{%f}%s}
|
|
\end{preview}
|
|
\end{document}
|
|
""" % (self._font_preamble, unicode_preamble, custom_preamble,
|
|
fontsize, fontsize * 1.25, tex)
|
|
with open(texfile, 'wb') as fh:
|
|
if rcParams['text.latex.unicode']:
|
|
fh.write(s.encode('utf8'))
|
|
else:
|
|
try:
|
|
fh.write(s.encode('ascii'))
|
|
except UnicodeEncodeError:
|
|
_log.info("You are using unicode and latex, but have not "
|
|
"enabled the 'text.latex.unicode' rcParam.")
|
|
raise
|
|
|
|
return texfile
|
|
|
|
def _run_checked_subprocess(self, command, tex):
|
|
_log.debug(cbook._pformat_subprocess(command))
|
|
try:
|
|
report = subprocess.check_output(command,
|
|
cwd=self.texcache,
|
|
stderr=subprocess.STDOUT)
|
|
except FileNotFoundError as exc:
|
|
raise RuntimeError(
|
|
'Failed to process string with tex because {} could not be '
|
|
'found'.format(command[0])) from exc
|
|
except subprocess.CalledProcessError as exc:
|
|
raise RuntimeError(
|
|
'{prog} was not able to process the following string:\n'
|
|
'{tex!r}\n\n'
|
|
'Here is the full report generated by {prog}:\n'
|
|
'{exc}\n\n'.format(
|
|
prog=command[0],
|
|
tex=tex.encode('unicode_escape'),
|
|
exc=exc.output.decode('utf-8'))) from exc
|
|
_log.debug(report)
|
|
return report
|
|
|
|
def make_dvi(self, tex, fontsize):
|
|
"""
|
|
Generate a dvi file containing latex's layout of tex string.
|
|
|
|
Return the file name.
|
|
"""
|
|
|
|
if rcParams['text.latex.preview']:
|
|
return self.make_dvi_preview(tex, fontsize)
|
|
|
|
basefile = self.get_basefile(tex, fontsize)
|
|
dvifile = '%s.dvi' % basefile
|
|
if not os.path.exists(dvifile):
|
|
texfile = self.make_tex(tex, fontsize)
|
|
with cbook._lock_path(texfile):
|
|
self._run_checked_subprocess(
|
|
["latex", "-interaction=nonstopmode", "--halt-on-error",
|
|
texfile], tex)
|
|
for fname in glob.glob(basefile + '*'):
|
|
if not fname.endswith(('dvi', 'tex')):
|
|
try:
|
|
os.remove(fname)
|
|
except OSError:
|
|
pass
|
|
|
|
return dvifile
|
|
|
|
def make_dvi_preview(self, tex, fontsize):
|
|
"""
|
|
Generate a dvi file containing latex's layout of tex string.
|
|
|
|
It calls make_tex_preview() method and store the size information
|
|
(width, height, descent) in a separate file.
|
|
|
|
Return the file name.
|
|
"""
|
|
basefile = self.get_basefile(tex, fontsize)
|
|
dvifile = '%s.dvi' % basefile
|
|
baselinefile = '%s.baseline' % basefile
|
|
|
|
if not os.path.exists(dvifile) or not os.path.exists(baselinefile):
|
|
texfile = self.make_tex_preview(tex, fontsize)
|
|
report = self._run_checked_subprocess(
|
|
["latex", "-interaction=nonstopmode", "--halt-on-error",
|
|
texfile], tex)
|
|
|
|
# find the box extent information in the latex output
|
|
# file and store them in ".baseline" file
|
|
m = TexManager._re_vbox.search(report.decode("utf-8"))
|
|
with open(basefile + '.baseline', "w") as fh:
|
|
fh.write(" ".join(m.groups()))
|
|
|
|
for fname in glob.glob(basefile + '*'):
|
|
if not fname.endswith(('dvi', 'tex', 'baseline')):
|
|
try:
|
|
os.remove(fname)
|
|
except OSError:
|
|
pass
|
|
|
|
return dvifile
|
|
|
|
def make_png(self, tex, fontsize, dpi):
|
|
"""
|
|
Generate a png file containing latex's rendering of tex string.
|
|
|
|
Return the file name.
|
|
"""
|
|
basefile = self.get_basefile(tex, fontsize, dpi)
|
|
pngfile = '%s.png' % basefile
|
|
# see get_rgba for a discussion of the background
|
|
if not os.path.exists(pngfile):
|
|
dvifile = self.make_dvi(tex, fontsize)
|
|
self._run_checked_subprocess(
|
|
["dvipng", "-bg", "Transparent", "-D", str(dpi),
|
|
"-T", "tight", "-o", pngfile, dvifile], tex)
|
|
return pngfile
|
|
|
|
def get_grey(self, tex, fontsize=None, dpi=None):
|
|
"""Return the alpha channel."""
|
|
from matplotlib import _png
|
|
key = tex, self.get_font_config(), fontsize, dpi
|
|
alpha = self.grey_arrayd.get(key)
|
|
if alpha is None:
|
|
pngfile = self.make_png(tex, fontsize, dpi)
|
|
with open(os.path.join(self.texcache, pngfile), "rb") as file:
|
|
X = _png.read_png(file)
|
|
self.grey_arrayd[key] = alpha = X[:, :, -1]
|
|
return alpha
|
|
|
|
def get_rgba(self, tex, fontsize=None, dpi=None, rgb=(0, 0, 0)):
|
|
"""Return latex's rendering of the tex string as an rgba array."""
|
|
if not fontsize:
|
|
fontsize = rcParams['font.size']
|
|
if not dpi:
|
|
dpi = rcParams['savefig.dpi']
|
|
r, g, b = rgb
|
|
key = tex, self.get_font_config(), fontsize, dpi, tuple(rgb)
|
|
Z = self.rgba_arrayd.get(key)
|
|
|
|
if Z is None:
|
|
alpha = self.get_grey(tex, fontsize, dpi)
|
|
Z = np.dstack([r, g, b, alpha])
|
|
self.rgba_arrayd[key] = Z
|
|
|
|
return Z
|
|
|
|
def get_text_width_height_descent(self, tex, fontsize, renderer=None):
|
|
"""Return width, height and descent of the text."""
|
|
if tex.strip() == '':
|
|
return 0, 0, 0
|
|
|
|
dpi_fraction = renderer.points_to_pixels(1.) if renderer else 1
|
|
|
|
if rcParams['text.latex.preview']:
|
|
# use preview.sty
|
|
basefile = self.get_basefile(tex, fontsize)
|
|
baselinefile = '%s.baseline' % basefile
|
|
|
|
if not os.path.exists(baselinefile):
|
|
dvifile = self.make_dvi_preview(tex, fontsize)
|
|
|
|
with open(baselinefile) as fh:
|
|
l = fh.read().split()
|
|
height, depth, width = [float(l1) * dpi_fraction for l1 in l]
|
|
return width, height + depth, depth
|
|
|
|
else:
|
|
# use dviread. It sometimes returns a wrong descent.
|
|
dvifile = self.make_dvi(tex, fontsize)
|
|
with dviread.Dvi(dvifile, 72 * dpi_fraction) as dvi:
|
|
page, = dvi
|
|
# A total height (including the descent) needs to be returned.
|
|
return page.width, page.height + page.descent, page.descent
|