Source code for matplotlib.backends.backend_pgf

import atexit
import codecs
import datetime
import functools
from io import BytesIO
import logging
import math
import os
import pathlib
import re
import shutil
import subprocess
from tempfile import TemporaryDirectory
import weakref

from PIL import Image

import matplotlib as mpl
from matplotlib import _api, cbook, font_manager as fm
from matplotlib.backend_bases import (
    _Backend, _check_savefig_extra_args, FigureCanvasBase, FigureManagerBase,
    GraphicsContextBase, RendererBase, _no_output_draw
)
from matplotlib.backends.backend_mixed import MixedModeRenderer
from matplotlib.backends.backend_pdf import (
    _create_pdf_info_dict, _datetime_to_pdf)
from matplotlib.path import Path
from matplotlib.figure import Figure
from matplotlib._pylab_helpers import Gcf

_log = logging.getLogger(__name__)


# Note: When formatting floating point values, it is important to use the
# %f/{:f} format rather than %s/{} to avoid triggering scientific notation,
# which is not recognized by TeX.


[docs]def get_fontspec(): """Build fontspec preamble from rc.""" latex_fontspec = [] texcommand = mpl.rcParams["pgf.texsystem"] if texcommand != "pdflatex": latex_fontspec.append("\\usepackage{fontspec}") if texcommand != "pdflatex" and mpl.rcParams["pgf.rcfonts"]: families = ["serif", "sans\\-serif", "monospace"] commands = ["setmainfont", "setsansfont", "setmonofont"] for family, command in zip(families, commands): # 1) Forward slashes also work on Windows, so don't mess with # backslashes. 2) The dirname needs to include a separator. path = pathlib.Path(fm.findfont(family)) latex_fontspec.append(r"\%s{%s}[Path=\detokenize{%s}]" % ( command, path.name, path.parent.as_posix() + "/")) return "\n".join(latex_fontspec)
[docs]def get_preamble(): """Get LaTeX preamble from rc.""" return mpl.rcParams["pgf.preamble"]
############################################################################### # This almost made me cry!!! # In the end, it's better to use only one unit for all coordinates, since the # arithmetic in latex seems to produce inaccurate conversions. latex_pt_to_in = 1. / 72.27 latex_in_to_pt = 1. / latex_pt_to_in mpl_pt_to_in = 1. / 72. mpl_in_to_pt = 1. / mpl_pt_to_in ############################################################################### # helper functions NO_ESCAPE = r"(?<!\\)(?:\\\\)*" re_mathsep = re.compile(NO_ESCAPE + r"\$") _replace_escapetext = functools.partial( # When the next character is _, ^, $, or % (not preceded by an escape), # insert a backslash. re.compile(NO_ESCAPE + "(?=[_^$%])").sub, "\\\\") _replace_mathdefault = functools.partial( # Replace \mathdefault (when not preceded by an escape) by empty string. re.compile(NO_ESCAPE + r"(\\mathdefault)").sub, "")
[docs]def common_texification(text): r""" Do some necessary and/or useful substitutions for texts to be included in LaTeX documents. This distinguishes text-mode and math-mode by replacing the math separator ``$`` with ``\(\displaystyle %s\)``. Escaped math separators (``\$``) are ignored. The following characters are escaped in text segments: ``_^$%`` """ # Sometimes, matplotlib adds the unknown command \mathdefault. # Not using \mathnormal instead since this looks odd for the latex cm font. text = _replace_mathdefault(text) text = text.replace("\N{MINUS SIGN}", r"\ensuremath{-}") # split text into normaltext and inline math parts parts = re_mathsep.split(text) for i, s in enumerate(parts): if not i % 2: # textmode replacements s = _replace_escapetext(s) else: # mathmode replacements s = r"\(\displaystyle %s\)" % s parts[i] = s return "".join(parts)
[docs]def writeln(fh, line): # every line of a file included with \\input must be terminated with % # if not, latex will create additional vertical spaces for some reason fh.write(line) fh.write("%\n")
def _font_properties_str(prop): # translate font properties to latex commands, return as string commands = [] families = {"serif": r"\rmfamily", "sans": r"\sffamily", "sans-serif": r"\sffamily", "monospace": r"\ttfamily"} family = prop.get_family()[0] if family in families: commands.append(families[family]) elif (any(font.name == family for font in fm.fontManager.ttflist) and mpl.rcParams["pgf.texsystem"] != "pdflatex"): commands.append(r"\setmainfont{%s}\rmfamily" % family) else: _log.warning("Ignoring unknown font: %s", family) size = prop.get_size_in_points() commands.append(r"\fontsize{%f}{%f}" % (size, size * 1.2)) styles = {"normal": r"", "italic": r"\itshape", "oblique": r"\slshape"} commands.append(styles[prop.get_style()]) boldstyles = ["semibold", "demibold", "demi", "bold", "heavy", "extra bold", "black"] if prop.get_weight() in boldstyles: commands.append(r"\bfseries") commands.append(r"\selectfont") return "".join(commands) def _metadata_to_str(key, value): """Convert metadata key/value to a form that hyperref accepts.""" if isinstance(value, datetime.datetime): value = _datetime_to_pdf(value) elif key == 'Trapped': value = value.name.decode('ascii') else: value = str(value) return f'{key}={{{value}}}'
[docs]def make_pdf_to_png_converter(): """Return a function that converts a pdf file to a png file.""" if shutil.which("pdftocairo"): def cairo_convert(pdffile, pngfile, dpi): cmd = ["pdftocairo", "-singlefile", "-png", "-r", "%d" % dpi, pdffile, os.path.splitext(pngfile)[0]] subprocess.check_output(cmd, stderr=subprocess.STDOUT) return cairo_convert try: gs_info = mpl._get_executable_info("gs") except mpl.ExecutableNotFoundError: pass else: def gs_convert(pdffile, pngfile, dpi): cmd = [gs_info.executable, '-dQUIET', '-dSAFER', '-dBATCH', '-dNOPAUSE', '-dNOPROMPT', '-dUseCIEColor', '-dTextAlphaBits=4', '-dGraphicsAlphaBits=4', '-dDOINTERPOLATE', '-sDEVICE=png16m', '-sOutputFile=%s' % pngfile, '-r%d' % dpi, pdffile] subprocess.check_output(cmd, stderr=subprocess.STDOUT) return gs_convert raise RuntimeError("No suitable pdf to png renderer found.")
[docs]class LatexError(Exception): def __init__(self, message, latex_output=""): super().__init__(message) self.latex_output = latex_output def __str__(self): s, = self.args if self.latex_output: s += "\n" + self.latex_output return s
[docs]class LatexManager: """ The LatexManager opens an instance of the LaTeX application for determining the metrics of text elements. The LaTeX environment can be modified by setting fonts and/or a custom preamble in `.rcParams`. """ @staticmethod def _build_latex_header(): latex_preamble = get_preamble() latex_fontspec = get_fontspec() # Create LaTeX header with some content, else LaTeX will load some math # fonts later when we don't expect the additional output on stdout. # TODO: is this sufficient? latex_header = [ r"\documentclass{minimal}", # Include TeX program name as a comment for cache invalidation. # TeX does not allow this to be the first line. rf"% !TeX program = {mpl.rcParams['pgf.texsystem']}", # Test whether \includegraphics supports interpolate option. r"\usepackage{graphicx}", latex_preamble, latex_fontspec, r"\begin{document}", r"text $math \mu$", # force latex to load fonts now r"\typeout{pgf_backend_query_start}", ] return "\n".join(latex_header) @classmethod def _get_cached_or_new(cls): """ Return the previous LatexManager if the header and tex system did not change, or a new instance otherwise. """ return cls._get_cached_or_new_impl(cls._build_latex_header()) @classmethod @functools.lru_cache(1) def _get_cached_or_new_impl(cls, header): # Helper for _get_cached_or_new. return cls() def _stdin_writeln(self, s): if self.latex is None: self._setup_latex_process() self.latex.stdin.write(s) self.latex.stdin.write("\n") self.latex.stdin.flush() def _expect(self, s): s = list(s) chars = [] while True: c = self.latex.stdout.read(1) chars.append(c) if chars[-len(s):] == s: break if not c: self.latex.kill() self.latex = None raise LatexError("LaTeX process halted", "".join(chars)) return "".join(chars) def _expect_prompt(self): return self._expect("\n*") def __init__(self): # create a tmp directory for running latex, register it for deletion self._tmpdir = TemporaryDirectory() self.tmpdir = self._tmpdir.name self._finalize_tmpdir = weakref.finalize(self, self._tmpdir.cleanup) # test the LaTeX setup to ensure a clean startup of the subprocess self.texcommand = mpl.rcParams["pgf.texsystem"] self.latex_header = LatexManager._build_latex_header() latex_end = "\n\\makeatletter\n\\@@end\n" try: latex = subprocess.Popen( [self.texcommand, "-halt-on-error"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding="utf-8", cwd=self.tmpdir) except FileNotFoundError as err: raise RuntimeError( f"{self.texcommand} not found. Install it or change " f"rcParams['pgf.texsystem'] to an available TeX " f"implementation.") from err except OSError as err: raise RuntimeError("Error starting process %r" % self.texcommand) from err test_input = self.latex_header + latex_end stdout, stderr = latex.communicate(test_input) if latex.returncode != 0: raise LatexError("LaTeX returned an error, probably missing font " "or error in preamble.", stdout) self.latex = None # Will be set up on first use. self.str_cache = {} # cache for strings already processed def _setup_latex_process(self): # Open LaTeX process for real work; register it for deletion. On # Windows, we must ensure that the subprocess has quit before being # able to delete the tmpdir in which it runs; in order to do so, we # must first `kill()` it, and then `communicate()` with it. self.latex = subprocess.Popen( [self.texcommand, "-halt-on-error"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding="utf-8", cwd=self.tmpdir) def finalize_latex(latex): latex.kill() latex.communicate() self._finalize_latex = weakref.finalize( self, finalize_latex, self.latex) # write header with 'pgf_backend_query_start' token self._stdin_writeln(self._build_latex_header()) # read all lines until our 'pgf_backend_query_start' token appears self._expect("*pgf_backend_query_start") self._expect_prompt()
[docs] @_api.deprecated("3.3") def latex_stdin_utf8(self): return self.latex.stdin
[docs] def get_width_height_descent(self, text, prop): """ Get the width, total height and descent for a text typeset by the current LaTeX environment. """ # apply font properties and define textbox prop_cmds = _font_properties_str(prop) textbox = "\\sbox0{%s %s}" % (prop_cmds, text) # check cache if textbox in self.str_cache: return self.str_cache[textbox] # send textbox to LaTeX and wait for prompt self._stdin_writeln(textbox) try: self._expect_prompt() except LatexError as e: raise ValueError("Error processing '{}'\nLaTeX Output:\n{}" .format(text, e.latex_output)) from e # typeout width, height and text offset of the last textbox self._stdin_writeln(r"\typeout{\the\wd0,\the\ht0,\the\dp0}") # read answer from latex and advance to the next prompt try: answer = self._expect_prompt() except LatexError as e: raise ValueError("Error processing '{}'\nLaTeX Output:\n{}" .format(text, e.latex_output)) from e # parse metrics from the answer string try: width, height, offset = answer.splitlines()[0].split(",") except Exception as err: raise ValueError("Error processing '{}'\nLaTeX Output:\n{}" .format(text, answer)) from err w, h, o = float(width[:-2]), float(height[:-2]), float(offset[:-2]) # the height returned from LaTeX goes from base to top. # the height matplotlib expects goes from bottom to top. self.str_cache[textbox] = (w, h + o, o) return w, h + o, o
@functools.lru_cache(1) def _get_image_inclusion_command(): man = LatexManager._get_cached_or_new() man._stdin_writeln( r"\includegraphics[interpolate=true]{%s}" # Don't mess with backslashes on Windows. % cbook._get_data_path("images/matplotlib.png").as_posix()) try: prompt = man._expect_prompt() return r"\includegraphics" except LatexError: # Discard the broken manager. LatexManager._get_cached_or_new_impl.cache_clear() return r"\pgfimage"
[docs]class RendererPgf(RendererBase): @_api.delete_parameter("3.3", "dummy") def __init__(self, figure, fh, dummy=False): """ Create a new PGF renderer that translates any drawing instruction into text commands to be interpreted in a latex pgfpicture environment. Attributes ---------- figure : `matplotlib.figure.Figure` Matplotlib figure to initialize height, width and dpi from. fh : file-like File handle for the output of the drawing commands. """ super().__init__() self.dpi = figure.dpi self.fh = fh self.figure = figure self.image_counter = 0 if dummy: # dummy==True deactivate all methods for m in RendererPgf.__dict__: if m.startswith("draw_"): self.__dict__[m] = lambda *args, **kwargs: None
[docs] def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None): # docstring inherited writeln(self.fh, r"\begin{pgfscope}") # convert from display units to in f = 1. / self.dpi # set style and clip self._print_pgf_clip(gc) self._print_pgf_path_styles(gc, rgbFace) # build marker definition bl, tr = marker_path.get_extents(marker_trans).get_points() coords = bl[0] * f, bl[1] * f, tr[0] * f, tr[1] * f writeln(self.fh, r"\[email protected]{currentmarker}" r"{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}{" % coords) self._print_pgf_path(None, marker_path, marker_trans) self._pgf_path_draw(stroke=gc.get_linewidth() != 0.0, fill=rgbFace is not None) writeln(self.fh, r"}") # draw marker for each vertex for point, code in path.iter_segments(trans, simplify=False): x, y = point[0] * f, point[1] * f writeln(self.fh, r"\begin{pgfscope}") writeln(self.fh, r"\[email protected]{%fin}{%fin}" % (x, y)) writeln(self.fh, r"\[email protected]{currentmarker}{}") writeln(self.fh, r"\end{pgfscope}") writeln(self.fh, r"\end{pgfscope}")
[docs] def draw_path(self, gc, path, transform, rgbFace=None): # docstring inherited writeln(self.fh, r"\begin{pgfscope}") # draw the path self._print_pgf_clip(gc) self._print_pgf_path_styles(gc, rgbFace) self._print_pgf_path(gc, path, transform, rgbFace) self._pgf_path_draw(stroke=gc.get_linewidth() != 0.0, fill=rgbFace is not None) writeln(self.fh, r"\end{pgfscope}") # if present, draw pattern on top if gc.get_hatch(): writeln(self.fh, r"\begin{pgfscope}") self._print_pgf_path_styles(gc, rgbFace) # combine clip and path for clipping self._print_pgf_clip(gc) self._print_pgf_path(gc, path, transform, rgbFace) writeln(self.fh, r"\pgfusepath{clip}") # build pattern definition writeln(self.fh, r"\[email protected]{currentpattern}" r"{\pgfqpoint{0in}{0in}}{\pgfqpoint{1in}{1in}}{") writeln(self.fh, r"\begin{pgfscope}") writeln(self.fh, r"\pgfpathrectangle" r"{\pgfqpoint{0in}{0in}}{\pgfqpoint{1in}{1in}}") writeln(self.fh, r"\pgfusepath{clip}") scale = mpl.transforms.Affine2D().scale(self.dpi) self._print_pgf_path(None, gc.get_hatch_path(), scale) self._pgf_path_draw(stroke=True) writeln(self.fh, r"\end{pgfscope}") writeln(self.fh, r"}") # repeat pattern, filling the bounding rect of the path f = 1. / self.dpi (xmin, ymin), (xmax, ymax) = \ path.get_extents(transform).get_points() xmin, xmax = f * xmin, f * xmax ymin, ymax = f * ymin, f * ymax repx, repy = math.ceil(xmax - xmin), math.ceil(ymax - ymin) writeln(self.fh, r"\[email protected]{%fin}{%fin}" % (xmin, ymin)) for iy in range(repy): for ix in range(repx): writeln(self.fh, r"\[email protected]{currentpattern}{}") writeln(self.fh, r"\[email protected]{1in}{0in}") writeln(self.fh, r"\[email protected]{-%din}{0in}" % repx) writeln(self.fh, r"\[email protected]{0in}{1in}") writeln(self.fh, r"\end{pgfscope}")
def _print_pgf_clip(self, gc): f = 1. / self.dpi # check for clip box bbox = gc.get_clip_rectangle() if bbox: p1, p2 = bbox.get_points() w, h = p2 - p1 coords = p1[0] * f, p1[1] * f, w * f, h * f writeln(self.fh, r"\pgfpathrectangle" r"{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}" % coords) writeln(self.fh, r"\pgfusepath{clip}") # check for clip path clippath, clippath_trans = gc.get_clip_path() if clippath is not None: self._print_pgf_path(gc, clippath, clippath_trans) writeln(self.fh, r"\pgfusepath{clip}") def _print_pgf_path_styles(self, gc, rgbFace): # cap style capstyles = {"butt": r"\pgfsetbuttcap", "round": r"\pgfsetroundcap", "projecting": r"\pgfsetrectcap"} writeln(self.fh, capstyles[gc.get_capstyle()]) # join style joinstyles = {"miter": r"\pgfsetmiterjoin", "round": r"\pgfsetroundjoin", "bevel": r"\pgfsetbeveljoin"} writeln(self.fh, joinstyles[gc.get_joinstyle()]) # filling has_fill = rgbFace is not None if gc.get_forced_alpha(): fillopacity = strokeopacity = gc.get_alpha() else: strokeopacity = gc.get_rgb()[3] fillopacity = rgbFace[3] if has_fill and len(rgbFace) > 3 else 1.0 if has_fill: writeln(self.fh, r"\definecolor{currentfill}{rgb}{%f,%f,%f}" % tuple(rgbFace[:3])) writeln(self.fh, r"\pgfsetfillcolor{currentfill}") if has_fill and fillopacity != 1.0: writeln(self.fh, r"\pgfsetfillopacity{%f}" % fillopacity) # linewidth and color lw = gc.get_linewidth() * mpl_pt_to_in * latex_in_to_pt stroke_rgba = gc.get_rgb() writeln(self.fh, r"\pgfsetlinewidth{%fpt}" % lw) writeln(self.fh, r"\definecolor{currentstroke}{rgb}{%f,%f,%f}" % stroke_rgba[:3]) writeln(self.fh, r"\pgfsetstrokecolor{currentstroke}") if strokeopacity != 1.0: writeln(self.fh, r"\pgfsetstrokeopacity{%f}" % strokeopacity) # line style dash_offset, dash_list = gc.get_dashes() if dash_list is None: writeln(self.fh, r"\pgfsetdash{}{0pt}") else: writeln(self.fh, r"\pgfsetdash{%s}{%fpt}" % ("".join(r"{%fpt}" % dash for dash in dash_list), dash_offset)) def _print_pgf_path(self, gc, path, transform, rgbFace=None): f = 1. / self.dpi # check for clip box / ignore clip for filled paths bbox = gc.get_clip_rectangle() if gc else None if bbox and (rgbFace is None): p1, p2 = bbox.get_points() clip = (p1[0], p1[1], p2[0], p2[1]) else: clip = None # build path for points, code in path.iter_segments(transform, clip=clip): if code == Path.MOVETO: x, y = tuple(points) writeln(self.fh, r"\pgfpathmoveto{\pgfqpoint{%fin}{%fin}}" % (f * x, f * y)) elif code == Path.CLOSEPOLY: writeln(self.fh, r"\pgfpathclose") elif code == Path.LINETO: x, y = tuple(points) writeln(self.fh, r"\pgfpathlineto{\pgfqpoint{%fin}{%fin}}" % (f * x, f * y)) elif code == Path.CURVE3: cx, cy, px, py = tuple(points) coords = cx * f, cy * f, px * f, py * f writeln(self.fh, r"\pgfpathquadraticcurveto" r"{\pgfqpoint{%fin}{%fin}}{\pgfqpoint{%fin}{%fin}}" % coords) elif code == Path.CURVE4: c1x, c1y, c2x, c2y, px, py = tuple(points) coords = c1x * f, c1y * f, c2x * f, c2y * f, px * f, py * f writeln(self.fh, r"\pgfpathcurveto" r"{\pgfqpoint{%fin}{%fin}}" r"{\pgfqpoint{%fin}{%fin}}" r"{\pgfqpoint{%fin}{%fin}}" % coords) def _pgf_path_draw(self, stroke=True, fill=False): actions = [] if stroke: actions.append("stroke") if fill: actions.append("fill") writeln(self.fh, r"\pgfusepath{%s}" % ",".join(actions))
[docs] def option_scale_image(self): # docstring inherited return True
[docs] def option_image_nocomposite(self): # docstring inherited return not mpl.rcParams['image.composite_image']
[docs] def draw_image(self, gc, x, y, im, transform=None): # docstring inherited h, w = im.shape[:2] if w == 0 or h == 0: return if not os.path.exists(getattr(self.fh, "name", "")): _api.warn_external( "streamed pgf-code does not support raster graphics, consider " "using the pgf-to-pdf option.") # save the images to png files path = pathlib.Path(self.fh.name) fname_img = "%s-img%d.png" % (path.stem, self.image_counter) Image.fromarray(im[::-1]).save(path.parent / fname_img) self.image_counter += 1 # reference the image in the pgf picture writeln(self.fh, r"\begin{pgfscope}") self._print_pgf_clip(gc) f = 1. / self.dpi # from display coords to inch if transform is None: writeln(self.fh, r"\[email protected]{%fin}{%fin}" % (x * f, y * f)) w, h = w * f, h * f else: tr1, tr2, tr3, tr4, tr5, tr6 = transform.frozen().to_values() writeln(self.fh, r"\[email protected]{%f}{%f}{%f}{%f}{%fin}{%fin}" % (tr1 * f, tr2 * f, tr3 * f, tr4 * f, (tr5 + x) * f, (tr6 + y) * f)) w = h = 1 # scale is already included in the transform interp = str(transform is None).lower() # interpolation in PDF reader writeln(self.fh, r"\pgftext[left,bottom]" r"{%s[interpolate=%s,width=%fin,height=%fin]{%s}}" % (_get_image_inclusion_command(), interp, w, h, fname_img)) writeln(self.fh, r"\end{pgfscope}")
[docs] def draw_tex(self, gc, x, y, s, prop, angle, ismath="TeX!", mtext=None): # docstring inherited self.draw_text(gc, x, y, s, prop, angle, ismath, mtext)
[docs] def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None): # docstring inherited # prepare string for tex s = common_texification(s) prop_cmds = _font_properties_str(prop) s = r"%s %s" % (prop_cmds, s) writeln(self.fh, r"\begin{pgfscope}") alpha = gc.get_alpha() if alpha != 1.0: writeln(self.fh, r"\pgfsetfillopacity{%f}" % alpha) writeln(self.fh, r"\pgfsetstrokeopacity{%f}" % alpha) rgb = tuple(gc.get_rgb())[:3] writeln(self.fh, r"\definecolor{textcolor}{rgb}{%f,%f,%f}" % rgb) writeln(self.fh, r"\pgfsetstrokecolor{textcolor}") writeln(self.fh, r"\pgfsetfillcolor{textcolor}") s = r"\color{textcolor}" + s dpi = self.figure.dpi text_args = [] if mtext and ( (angle == 0 or mtext.get_rotation_mode() == "anchor") and mtext.get_verticalalignment() != "center_baseline"): # if text anchoring can be supported, get the original coordinates # and add alignment information pos = mtext.get_unitless_position() x, y = mtext.get_transform().transform(pos) halign = {"left": "left", "right": "right", "center": ""} valign = {"top": "top", "bottom": "bottom", "baseline": "base", "center": ""} text_args.extend([ f"x={x/dpi:f}in", f"y={y/dpi:f}in", halign[mtext.get_horizontalalignment()], valign[mtext.get_verticalalignment()], ]) else: # if not, use the text layout provided by Matplotlib. text_args.append(f"x={x/dpi:f}in, y={y/dpi:f}in, left, base") if angle != 0: text_args.append("rotate=%f" % angle) writeln(self.fh, r"\pgftext[%s]{%s}" % (",".join(text_args), s)) writeln(self.fh, r"\end{pgfscope}")
[docs] def get_text_width_height_descent(self, s, prop, ismath): # docstring inherited # check if the math is supposed to be displaystyled s = common_texification(s) # get text metrics in units of latex pt, convert to display units w, h, d = (LatexManager._get_cached_or_new() .get_width_height_descent(s, prop)) # TODO: this should be latex_pt_to_in instead of mpl_pt_to_in # but having a little bit more space around the text looks better, # plus the bounding box reported by LaTeX is VERY narrow f = mpl_pt_to_in * self.dpi return w * f, h * f, d * f
[docs] def flipy(self): # docstring inherited return False
[docs] def get_canvas_width_height(self): # docstring inherited return (self.figure.get_figwidth() * self.dpi, self.figure.get_figheight() * self.dpi)
[docs] def points_to_pixels(self, points): # docstring inherited return points * mpl_pt_to_in * self.dpi
[docs]@_api.deprecated("3.3", alternative="GraphicsContextBase") class GraphicsContextPgf(GraphicsContextBase): pass
[docs]@_api.deprecated("3.4") class TmpDirCleaner: _remaining_tmpdirs = set() @_api.classproperty @_api.deprecated("3.4") def remaining_tmpdirs(cls): return cls._remaining_tmpdirs
[docs] @staticmethod @_api.deprecated("3.4") def add(tmpdir): TmpDirCleaner._remaining_tmpdirs.add(tmpdir)
[docs] @staticmethod @_api.deprecated("3.4") @atexit.register def cleanup_remaining_tmpdirs(): for tmpdir in TmpDirCleaner._remaining_tmpdirs: error_message = "error deleting tmp directory {}".format(tmpdir) shutil.rmtree( tmpdir, onerror=lambda *args: _log.error(error_message))
[docs]class FigureCanvasPgf(FigureCanvasBase): filetypes = {"pgf": "LaTeX PGF picture", "pdf": "LaTeX compiled PGF picture", "png": "Portable Network Graphics", }
[docs] def get_default_filetype(self): return 'pdf'
@_check_savefig_extra_args def _print_pgf_to_fh(self, fh, *, bbox_inches_restore=None): header_text = """%% Creator: Matplotlib, PGF backend %% %% To include the figure in your LaTeX document, write %% \\input{<filename>.pgf} %% %% Make sure the required packages are loaded in your preamble %% \\usepackage{pgf} %% %% Figures using additional raster images can only be included by \\input if %% they are in the same directory as the main LaTeX file. For loading figures %% from other directories you can use the `import` package %% \\usepackage{import} %% %% and then include the figures with %% \\import{<path to file>}{<filename>.pgf} %% """ # append the preamble used by the backend as a comment for debugging header_info_preamble = ["%% Matplotlib used the following preamble"] for line in get_preamble().splitlines(): header_info_preamble.append("%% " + line) for line in get_fontspec().splitlines(): header_info_preamble.append("%% " + line) header_info_preamble.append("%%") header_info_preamble = "\n".join(header_info_preamble) # get figure size in inch w, h = self.figure.get_figwidth(), self.figure.get_figheight() dpi = self.figure.get_dpi() # create pgfpicture environment and write the pgf code fh.write(header_text) fh.write(header_info_preamble) fh.write("\n") writeln(fh, r"\begingroup") writeln(fh, r"\makeatletter") writeln(fh, r"\begin{pgfpicture}") writeln(fh, r"\pgfpathrectangle{\pgfpointorigin}{\pgfqpoint{%fin}{%fin}}" % (w, h)) writeln(fh, r"\pgfusepath{use as bounding box, clip}") renderer = MixedModeRenderer(self.figure, w, h, dpi, RendererPgf(self.figure, fh), bbox_inches_restore=bbox_inches_restore) self.figure.draw(renderer) # end the pgfpicture environment writeln(fh, r"\end{pgfpicture}") writeln(fh, r"\makeatother") writeln(fh, r"\endgroup")
[docs] def print_pgf(self, fname_or_fh, *args, **kwargs): """ Output pgf macros for drawing the figure so it can be included and rendered in latex documents. """ with cbook.open_file_cm(fname_or_fh, "w", encoding="utf-8") as file: if not cbook.file_requires_unicode(file): file = codecs.getwriter("utf-8")(file) self._print_pgf_to_fh(file, *args, **kwargs)
[docs] def print_pdf(self, fname_or_fh, *args, metadata=None, **kwargs): """Use LaTeX to compile a pgf generated figure to pdf.""" w, h = self.figure.get_figwidth(), self.figure.get_figheight() info_dict = _create_pdf_info_dict('pgf', metadata or {}) hyperref_options = ','.join( _metadata_to_str(k, v) for k, v in info_dict.items()) with TemporaryDirectory() as tmpdir: tmppath = pathlib.Path(tmpdir) # print figure to pgf and compile it with latex self.print_pgf(tmppath / "figure.pgf", *args, **kwargs) latexcode = """ \\PassOptionsToPackage{pdfinfo={%s}}{hyperref} \\RequirePackage{hyperref} \\documentclass[12pt]{minimal} \\usepackage[paperwidth=%fin, paperheight=%fin, margin=0in]{geometry} %s %s \\usepackage{pgf} \\begin{document} \\centering \\input{figure.pgf} \\end{document}""" % (hyperref_options, w, h, get_preamble(), get_fontspec()) (tmppath / "figure.tex").write_text(latexcode, encoding="utf-8") texcommand = mpl.rcParams["pgf.texsystem"] cbook._check_and_log_subprocess( [texcommand, "-interaction=nonstopmode", "-halt-on-error", "figure.tex"], _log, cwd=tmpdir) with (tmppath / "figure.pdf").open("rb") as orig, \ cbook.open_file_cm(fname_or_fh, "wb") as dest: shutil.copyfileobj(orig, dest) # copy file contents to target
[docs] def print_png(self, fname_or_fh, *args, **kwargs): """Use LaTeX to compile a pgf figure to pdf and convert it to png.""" converter = make_pdf_to_png_converter() with TemporaryDirectory() as tmpdir: tmppath = pathlib.Path(tmpdir) pdf_path = tmppath / "figure.pdf" png_path = tmppath / "figure.png" self.print_pdf(pdf_path, *args, **kwargs) converter(pdf_path, png_path, dpi=self.figure.dpi) with png_path.open("rb") as orig, \ cbook.open_file_cm(fname_or_fh, "wb") as dest: shutil.copyfileobj(orig, dest) # copy file contents to target
[docs] def get_renderer(self): return RendererPgf(self.figure, None)
[docs] def draw(self): _no_output_draw(self.figure) return super().draw()
FigureManagerPgf = FigureManagerBase @_Backend.export class _BackendPgf(_Backend): FigureCanvas = FigureCanvasPgf
[docs]class PdfPages: """ A multi-page PDF file using the pgf backend Examples -------- >>> import matplotlib.pyplot as plt >>> # Initialize: >>> with PdfPages('foo.pdf') as pdf: ... # As many times as you like, create a figure fig and save it: ... fig = plt.figure() ... pdf.savefig(fig) ... # When no figure is specified the current figure is saved ... pdf.savefig() """ __slots__ = ( '_output_name', 'keep_empty', '_n_figures', '_file', '_info_dict', '_metadata', ) metadata = _api.deprecated('3.3')(property(lambda self: self._metadata)) def __init__(self, filename, *, keep_empty=True, metadata=None): """ Create a new PdfPages object. Parameters ---------- filename : str or path-like Plots using `PdfPages.savefig` will be written to a file at this location. Any older file with the same name is overwritten. keep_empty : bool, default: True If set to False, then empty pdf files will be deleted automatically when closed. metadata : dict, optional Information dictionary object (see PDF reference section 10.2.1 'Document Information Dictionary'), e.g.: ``{'Creator': 'My software', 'Author': 'Me', 'Title': 'Awesome'}``. The standard keys are 'Title', 'Author', 'Subject', 'Keywords', 'Creator', 'Producer', 'CreationDate', 'ModDate', and 'Trapped'. Values have been predefined for 'Creator', 'Producer' and 'CreationDate'. They can be removed by setting them to `None`. """ self._output_name = filename self._n_figures = 0 self.keep_empty = keep_empty self._metadata = (metadata or {}).copy() if metadata: for key in metadata: canonical = { 'creationdate': 'CreationDate', 'moddate': 'ModDate', }.get(key.lower(), key.lower().title()) if canonical != key: _api.warn_deprecated( '3.3', message='Support for setting PDF metadata keys ' 'case-insensitively is deprecated since %(since)s and ' 'will be removed %(removal)s; ' f'set {canonical} instead of {key}.') self._metadata[canonical] = self._metadata.pop(key) self._info_dict = _create_pdf_info_dict('pgf', self._metadata) self._file = BytesIO() def _write_header(self, width_inches, height_inches): hyperref_options = ','.join( _metadata_to_str(k, v) for k, v in self._info_dict.items()) latex_preamble = get_preamble() latex_fontspec = get_fontspec() latex_header = r"""\PassOptionsToPackage{{ pdfinfo={{ {metadata} }} }}{{hyperref}} \RequirePackage{{hyperref}} \documentclass[12pt]{{minimal}} \usepackage[ paperwidth={width}in, paperheight={height}in, margin=0in ]{{geometry}} {preamble} {fontspec} \usepackage{{pgf}} \setlength{{\parindent}}{{0pt}} \begin{{document}}%% """.format( width=width_inches, height=height_inches, preamble=latex_preamble, fontspec=latex_fontspec, metadata=hyperref_options, ) self._file.write(latex_header.encode('utf-8')) def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.close()
[docs] def close(self): """ Finalize this object, running LaTeX in a temporary directory and moving the final pdf file to *filename*. """ self._file.write(rb'\end{document}\n') if self._n_figures > 0: self._run_latex() elif self.keep_empty: open(self._output_name, 'wb').close() self._file.close()
def _run_latex(self): texcommand = mpl.rcParams["pgf.texsystem"] with TemporaryDirectory() as tmpdir: tex_source = pathlib.Path(tmpdir, "pdf_pages.tex") tex_source.write_bytes(self._file.getvalue()) cbook._check_and_log_subprocess( [texcommand, "-interaction=nonstopmode", "-halt-on-error", tex_source], _log, cwd=tmpdir) shutil.move(tex_source.with_suffix(".pdf"), self._output_name)
[docs] def savefig(self, figure=None, **kwargs): """ Save a `.Figure` to this file as a new page. Any other keyword arguments are passed to `~.Figure.savefig`. Parameters ---------- figure : `.Figure` or int, optional Specifies what figure is saved to file. If not specified, the active figure is saved. If a `.Figure` instance is provided, this figure is saved. If an int is specified, the figure instance to save is looked up by number. """ if not isinstance(figure, Figure): if figure is None: manager = Gcf.get_active() else: manager = Gcf.get_fig_manager(figure) if manager is None: raise ValueError("No figure {}".format(figure)) figure = manager.canvas.figure try: orig_canvas = figure.canvas figure.canvas = FigureCanvasPgf(figure) width, height = figure.get_size_inches() if self._n_figures == 0: self._write_header(width, height) else: # \pdfpagewidth and \pdfpageheight exist on pdftex, xetex, and # luatex<0.85; they were renamed to \pagewidth and \pageheight # on luatex>=0.85. self._file.write( br'\newpage' br'\ifdefined\pdfpagewidth\pdfpagewidth' br'\else\pagewidth\fi=%ain' br'\ifdefined\pdfpageheight\pdfpageheight' br'\else\pageheight\fi=%ain' b'%%\n' % (width, height) ) figure.savefig(self._file, format="pgf", **kwargs) self._n_figures += 1 finally: figure.canvas = orig_canvas
[docs] def get_pagecount(self): """Return the current number of pages in the multipage pdf file.""" return self._n_figures