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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>matplotlib.mathtext — Matplotlib 3.1.0 documentation</title>

type="text/css" />

type="text/css" />

title="Search within Matplotlib 3.1.0 documentation"

href="../../_static/opensearch.xml"/>

</head>

<body>

The 2019 SciPy John Hunter Excellence in Plotting Contest is accepting submissions!

<a href="https://docs.google.com/forms/d/e/1FAIpQLSe-_AnKvYSzeQWfNDRoXgW0vl7_8q6jj3QbLIac8eUcb9lSAA/viewform?usp=sf_link" style="font-weight: bold;">Apply by June 8th</a>

</div>

<div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px">Version 3.1.0</div>

<div id="forkongithub"><a href="https://github.com/matplotlib/matplotlib">Fork me on GitHub</a></div>

</div>

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<ul>

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<h1>Source code for matplotlib.mathtext</h1><div class="highlight"><pre>

r"""

:mod:`~matplotlib.mathtext` is a module for parsing a subset of the

TeX math syntax and drawing them to a matplotlib backend.

For a tutorial of its usage see :doc:`/tutorials/text/mathtext`. This

document is primarily concerned with implementation details.

The module uses pyparsing_ to parse the TeX expression.

.. _pyparsing: http://pyparsing.wikispaces.com/

The Bakoma distribution of the TeX Computer Modern fonts, and STIX

fonts are supported. There is experimental support for using

arbitrary fonts, but results may vary without proper tweaking and

metrics for those fonts.

"""

from collections import namedtuple

import functools

from io import StringIO

import logging

import os

import types

import unicodedata

import numpy as np

from pyparsing import (

Combine, Empty, FollowedBy, Forward, Group, Literal, oneOf, OneOrMore,

Optional, ParseBaseException, ParseFatalException, ParserElement,

QuotedString, Regex, StringEnd, Suppress, ZeroOrMore)

ParserElement.enablePackrat()

from matplotlib import cbook, colors as mcolors, get_data_path, rcParams

from matplotlib.afm import AFM

from matplotlib.cbook import get_realpath_and_stat

from matplotlib.ft2font import FT2Image, KERNING_DEFAULT, LOAD_NO_HINTING

from matplotlib.font_manager import findfont, FontProperties, get_font

from matplotlib._mathtext_data import (latex_to_bakoma, latex_to_standard,

tex2uni, latex_to_cmex,

stix_virtual_fonts)

_log = logging.getLogger(__name__)

##############################################################################

# FONTS

<div class="viewcode-block" id="get_unicode_index"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.get_unicode_index">[docs]</a>def get_unicode_index(symbol, math=True):

r"""

Return the integer index (from the Unicode table) of *symbol*.

Parameters

----------

symbol : str

A single unicode character, a TeX command (e.g. r'\pi') or a Type1

symbol name (e.g. 'phi').

math : bool, default is True

If False, always treat as a single unicode character.

"""

# for a non-math symbol, simply return its unicode index

if not math:

return ord(symbol)

# From UTF #25: U+2212 minus sign is the preferred

# representation of the unary and binary minus sign rather than

# the ASCII-derived U+002D hyphen-minus, because minus sign is

# unambiguous and because it is rendered with a more desirable

# length, usually longer than a hyphen.

if symbol == '-':

return 0x2212

try: # This will succeed if symbol is a single unicode char

return ord(symbol)

except TypeError:

pass

try: # Is symbol a TeX symbol (i.e. \alpha)

return tex2uni[symbol.strip("\\")]

except KeyError:

raise ValueError(

"'{}' is not a valid Unicode character or TeX/Type1 symbol"

.format(symbol))</div>

unichr_safe = cbook.deprecated("3.0")(chr)

<div class="viewcode-block" id="MathtextBackend"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend">[docs]</a>class MathtextBackend(object):

"""

The base class for the mathtext backend-specific code. The

purpose of :class:`MathtextBackend` subclasses is to interface

between mathtext and a specific matplotlib graphics backend.

Subclasses need to override the following:

- :meth:`render_glyph`

- :meth:`render_rect_filled`

- :meth:`get_results`

And optionally, if you need to use a FreeType hinting style:

- :meth:`get_hinting_type`

"""

def __init__(self):

self.width = 0

self.height = 0

self.depth = 0

<div class="viewcode-block" id="MathtextBackend.set_canvas_size"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend.set_canvas_size">[docs]</a> def set_canvas_size(self, w, h, d):

'Dimension the drawing canvas'

self.width = w

self.height = h

self.depth = d</div>

<div class="viewcode-block" id="MathtextBackend.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

"""

Draw a glyph described by *info* to the reference point (*ox*,

*oy*).

"""

raise NotImplementedError()</div>

<div class="viewcode-block" id="MathtextBackend.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

"""

Draw a filled black rectangle from (*x1*, *y1*) to (*x2*, *y2*).

"""

raise NotImplementedError()</div>

<div class="viewcode-block" id="MathtextBackend.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend.get_results">[docs]</a> def get_results(self, box):

"""

Return a backend-specific tuple to return to the backend after

all processing is done.

"""

raise NotImplementedError()</div>

<div class="viewcode-block" id="MathtextBackend.get_hinting_type"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackend.get_hinting_type">[docs]</a> def get_hinting_type(self):

"""

Get the FreeType hinting type to use with this particular

backend.

"""

return LOAD_NO_HINTING</div></div>

<div class="viewcode-block" id="MathtextBackendAgg"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg">[docs]</a>class MathtextBackendAgg(MathtextBackend):

"""

Render glyphs and rectangles to an FTImage buffer, which is later

transferred to the Agg image by the Agg backend.

"""

def __init__(self):

self.ox = 0

self.oy = 0

self.image = None

self.mode = 'bbox'

self.bbox = [0, 0, 0, 0]

MathtextBackend.__init__(self)

def _update_bbox(self, x1, y1, x2, y2):

self.bbox = [min(self.bbox[0], x1),

min(self.bbox[1], y1),

max(self.bbox[2], x2),

max(self.bbox[3], y2)]

<div class="viewcode-block" id="MathtextBackendAgg.set_canvas_size"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg.set_canvas_size">[docs]</a> def set_canvas_size(self, w, h, d):

MathtextBackend.set_canvas_size(self, w, h, d)

if self.mode != 'bbox':

self.image = FT2Image(np.ceil(w), np.ceil(h + max(d, 0)))</div>

<div class="viewcode-block" id="MathtextBackendAgg.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

if self.mode == 'bbox':

self._update_bbox(ox + info.metrics.xmin,

oy - info.metrics.ymax,

ox + info.metrics.xmax,

else:

info.font.draw_glyph_to_bitmap(

self.image, ox, oy - info.metrics.iceberg, info.glyph,

antialiased=rcParams['text.antialiased'])</div>

<div class="viewcode-block" id="MathtextBackendAgg.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

if self.mode == 'bbox':

self._update_bbox(x1, y1, x2, y2)

else:

height = max(int(y2 - y1) - 1, 0)

if height == 0:

center = (y2 + y1) / 2.0

y = int(center - (height + 1) / 2.0)

else:

y = int(y1)

self.image.draw_rect_filled(int(x1), y, np.ceil(x2), y + height)</div>

<div class="viewcode-block" id="MathtextBackendAgg.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg.get_results">[docs]</a> def get_results(self, box, used_characters):

self.mode = 'bbox'

orig_height = box.height

orig_depth = box.depth

ship(0, 0, box)

bbox = self.bbox

bbox = [bbox[0] - 1, bbox[1] - 1, bbox[2] + 1, bbox[3] + 1]

self.mode = 'render'

self.set_canvas_size(

bbox[2] - bbox[0],

(bbox[3] - bbox[1]) - orig_depth,

ship(-bbox[0], -bbox[1], box)

result = (self.ox,

self.oy,

self.width,

self.height + self.depth,

self.depth,

self.image,

used_characters)

self.image = None

return result</div>

<div class="viewcode-block" id="MathtextBackendAgg.get_hinting_type"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendAgg.get_hinting_type">[docs]</a> def get_hinting_type(self):

from matplotlib.backends import backend_agg

return backend_agg.get_hinting_flag()</div></div>

<div class="viewcode-block" id="MathtextBackendBitmap"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendBitmap">[docs]</a>class MathtextBackendBitmap(MathtextBackendAgg):

<div class="viewcode-block" id="MathtextBackendBitmap.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendBitmap.get_results">[docs]</a> def get_results(self, box, used_characters):

ox, oy, width, height, depth, image, characters = \

MathtextBackendAgg.get_results(self, box, used_characters)

return image, depth</div></div>

<div class="viewcode-block" id="MathtextBackendPs"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPs">[docs]</a>class MathtextBackendPs(MathtextBackend):

"""

Store information to write a mathtext rendering to the PostScript backend.

"""

_PSResult = namedtuple(

"_PSResult", "width height depth pswriter used_characters")

def __init__(self):

self.pswriter = StringIO()

self.lastfont = None

<div class="viewcode-block" id="MathtextBackendPs.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPs.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

oy = self.height - oy + info.offset

postscript_name = info.postscript_name

fontsize = info.fontsize

symbol_name = info.symbol_name

if (postscript_name, fontsize) != self.lastfont:

ps = """/%(postscript_name)s findfont

%(fontsize)s scalefont

setfont

""" % locals()

self.lastfont = postscript_name, fontsize

self.pswriter.write(ps)

ps = """%(ox)f %(oy)f moveto

/%(symbol_name)s glyphshow\n

""" % locals()

<div class="viewcode-block" id="MathtextBackendPs.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPs.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

ps = "%f %f %f %f rectfill\n" % (

x1, self.height - y2, x2 - x1, y2 - y1)

<div class="viewcode-block" id="MathtextBackendPs.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPs.get_results">[docs]</a> def get_results(self, box, used_characters):

return self._PSResult(self.width,

self.depth,

self.pswriter,

used_characters)</div></div>

<div class="viewcode-block" id="MathtextBackendPdf"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPdf">[docs]</a>class MathtextBackendPdf(MathtextBackend):

"""Store information to write a mathtext rendering to the PDF backend."""

_PDFResult = namedtuple(

"_PDFResult", "width height depth glyphs rects used_characters")

def __init__(self):

self.glyphs = []

self.rects = []

<div class="viewcode-block" id="MathtextBackendPdf.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPdf.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

filename = info.font.fname

self.glyphs.append(

(ox, oy, filename, info.fontsize,

info.num, info.symbol_name))</div>

<div class="viewcode-block" id="MathtextBackendPdf.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPdf.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

self.rects.append((x1, self.height - y2, x2 - x1, y2 - y1))</div>

<div class="viewcode-block" id="MathtextBackendPdf.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPdf.get_results">[docs]</a> def get_results(self, box, used_characters):

return self._PDFResult(self.width,

self.depth,

self.glyphs,

self.rects,

used_characters)</div></div>

<div class="viewcode-block" id="MathtextBackendSvg"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendSvg">[docs]</a>class MathtextBackendSvg(MathtextBackend):

"""

Store information to write a mathtext rendering to the SVG

backend.

"""

def __init__(self):

self.svg_glyphs = []

self.svg_rects = []

<div class="viewcode-block" id="MathtextBackendSvg.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendSvg.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

self.svg_glyphs.append(

(info.font, info.fontsize, info.num, ox, oy, info.metrics))</div>

<div class="viewcode-block" id="MathtextBackendSvg.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendSvg.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

self.svg_rects.append(

(x1, self.height - y1 + 1, x2 - x1, y2 - y1))</div>

<div class="viewcode-block" id="MathtextBackendSvg.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendSvg.get_results">[docs]</a> def get_results(self, box, used_characters):

svg_elements = types.SimpleNamespace(svg_glyphs=self.svg_glyphs,

svg_rects=self.svg_rects)

return (self.width,

self.depth,

svg_elements,

used_characters)</div></div>

<div class="viewcode-block" id="MathtextBackendPath"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPath">[docs]</a>class MathtextBackendPath(MathtextBackend):

"""

Store information to write a mathtext rendering to the text path

machinery.

"""

def __init__(self):

self.glyphs = []

self.rects = []

<div class="viewcode-block" id="MathtextBackendPath.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPath.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

thetext = info.num

self.glyphs.append(

(info.font, info.fontsize, thetext, ox, oy))</div>

<div class="viewcode-block" id="MathtextBackendPath.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPath.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

<div class="viewcode-block" id="MathtextBackendPath.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendPath.get_results">[docs]</a> def get_results(self, box, used_characters):

return (self.width,

self.depth,

self.glyphs,

self.rects)</div></div>

<div class="viewcode-block" id="MathtextBackendCairo"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendCairo">[docs]</a>class MathtextBackendCairo(MathtextBackend):

"""

Store information to write a mathtext rendering to the Cairo

backend.

"""

def __init__(self):

self.glyphs = []

self.rects = []

<div class="viewcode-block" id="MathtextBackendCairo.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendCairo.render_glyph">[docs]</a> def render_glyph(self, ox, oy, info):

oy = oy - info.offset - self.height

thetext = chr(info.num)

self.glyphs.append(

(info.font, info.fontsize, thetext, ox, oy))</div>

<div class="viewcode-block" id="MathtextBackendCairo.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendCairo.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

self.rects.append(

(x1, y1 - self.height, x2 - x1, y2 - y1))</div>

<div class="viewcode-block" id="MathtextBackendCairo.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.MathtextBackendCairo.get_results">[docs]</a> def get_results(self, box, used_characters):

return (self.width,

self.depth,

self.glyphs,

self.rects)</div></div>

<div class="viewcode-block" id="Fonts"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts">[docs]</a>class Fonts(object):

"""

An abstract base class for a system of fonts to use for mathtext.

The class must be able to take symbol keys and font file names and

return the character metrics. It also delegates to a backend class

to do the actual drawing.

"""

def __init__(self, default_font_prop, mathtext_backend):

"""

*default_font_prop*: A

:class:`~matplotlib.font_manager.FontProperties` object to use

for the default non-math font, or the base font for Unicode

(generic) font rendering.

*mathtext_backend*: A subclass of :class:`MathTextBackend`

used to delegate the actual rendering.

"""

self.default_font_prop = default_font_prop

self.mathtext_backend = mathtext_backend

self.used_characters = {}

<div class="viewcode-block" id="Fonts.destroy"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.destroy">[docs]</a> def destroy(self):

"""

Fix any cyclical references before the object is about

to be destroyed.

"""

self.used_characters = None</div>

<div class="viewcode-block" id="Fonts.get_kern"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_kern">[docs]</a> def get_kern(self, font1, fontclass1, sym1, fontsize1,

font2, fontclass2, sym2, fontsize2, dpi):

"""

Get the kerning distance for font between *sym1* and *sym2*.

*fontX*: one of the TeX font names::

tt, it, rm, cal, sf, bf or default/regular (non-math)

*fontclassX*: TODO

*symX*: a symbol in raw TeX form. e.g., '1', 'x' or '\\sigma'

*fontsizeX*: the fontsize in points

*dpi*: the current dots-per-inch

"""

return 0.</div>

<div class="viewcode-block" id="Fonts.get_metrics"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_metrics">[docs]</a> def get_metrics(self, font, font_class, sym, fontsize, dpi, math=True):

"""

*font*: one of the TeX font names::

tt, it, rm, cal, sf, bf or default/regular (non-math)

*font_class*: TODO

*sym*: a symbol in raw TeX form. e.g., '1', 'x' or '\\sigma'

*fontsize*: font size in points

*dpi*: current dots-per-inch

*math*: whether sym is a math character

Returns an object with the following attributes:

- *advance*: The advance distance (in points) of the glyph.

- *height*: The height of the glyph in points.

- *width*: The width of the glyph in points.

- *xmin*, *xmax*, *ymin*, *ymax* - the ink rectangle of the glyph

- *iceberg* - the distance from the baseline to the top of

the glyph. This corresponds to TeX's definition of

"height".

"""

info = self._get_info(font, font_class, sym, fontsize, dpi, math)

return info.metrics</div>

<div class="viewcode-block" id="Fonts.set_canvas_size"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.set_canvas_size">[docs]</a> def set_canvas_size(self, w, h, d):

"""

Set the size of the buffer used to render the math expression.

Only really necessary for the bitmap backends.

"""

self.width, self.height, self.depth = np.ceil([w, h, d])

self.mathtext_backend.set_canvas_size(

<div class="viewcode-block" id="Fonts.render_glyph"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.render_glyph">[docs]</a> def render_glyph(self, ox, oy, facename, font_class, sym, fontsize, dpi):

"""

Draw a glyph at

- *ox*, *oy*: position

- *facename*: One of the TeX face names

- *font_class*:

- *sym*: TeX symbol name or single character

- *fontsize*: fontsize in points

- *dpi*: The dpi to draw at.

"""

info = self._get_info(facename, font_class, sym, fontsize, dpi)

realpath, stat_key = get_realpath_and_stat(info.font.fname)

used_characters = self.used_characters.setdefault(

stat_key, (realpath, set()))

used_characters[1].add(info.num)

self.mathtext_backend.render_glyph(ox, oy, info)</div>

<div class="viewcode-block" id="Fonts.render_rect_filled"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.render_rect_filled">[docs]</a> def render_rect_filled(self, x1, y1, x2, y2):

"""

Draw a filled rectangle from (*x1*, *y1*) to (*x2*, *y2*).

"""

self.mathtext_backend.render_rect_filled(x1, y1, x2, y2)</div>

<div class="viewcode-block" id="Fonts.get_xheight"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_xheight">[docs]</a> def get_xheight(self, font, fontsize, dpi):

"""

Get the xheight for the given *font* and *fontsize*.

"""

raise NotImplementedError()</div>

<div class="viewcode-block" id="Fonts.get_underline_thickness"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_underline_thickness">[docs]</a> def get_underline_thickness(self, font, fontsize, dpi):

"""

Get the line thickness that matches the given font. Used as a

base unit for drawing lines such as in a fraction or radical.

"""

raise NotImplementedError()</div>

<div class="viewcode-block" id="Fonts.get_used_characters"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_used_characters">[docs]</a> def get_used_characters(self):

"""

Get the set of characters that were used in the math

expression. Used by backends that need to subset fonts so

they know which glyphs to include.

"""

return self.used_characters</div>

<div class="viewcode-block" id="Fonts.get_results"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_results">[docs]</a> def get_results(self, box):

"""

Get the data needed by the backend to render the math

expression. The return value is backend-specific.

"""

result = self.mathtext_backend.get_results(

box, self.get_used_characters())

self.destroy()

return result</div>

<div class="viewcode-block" id="Fonts.get_sized_alternatives_for_symbol"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.Fonts.get_sized_alternatives_for_symbol">[docs]</a> def get_sized_alternatives_for_symbol(self, fontname, sym):

"""

Override if your font provides multiple sizes of the same

symbol. Should return a list of symbols matching *sym* in

various sizes. The expression renderer will select the most

appropriate size for a given situation from this list.

"""

return [(fontname, sym)]</div></div>

<div class="viewcode-block" id="TruetypeFonts"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.TruetypeFonts">[docs]</a>class TruetypeFonts(Fonts):

"""

A generic base class for all font setups that use Truetype fonts

(through FT2Font).

"""

Fonts.__init__(self, default_font_prop, mathtext_backend)

self.glyphd = {}

self._fonts = {}

filename = findfont(default_font_prop)

default_font = get_font(filename)

self._fonts['default'] = default_font

self._fonts['regular'] = default_font

<div class="viewcode-block" id="TruetypeFonts.destroy"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.TruetypeFonts.destroy">[docs]</a> def destroy(self):

self.glyphd = None

Fonts.destroy(self)</div>

def _get_font(self, font):

if font in self.fontmap:

basename = self.fontmap[font]

else:

basename = font

cached_font = self._fonts.get(basename)

if cached_font is None and os.path.exists(basename):

cached_font = get_font(basename)

self._fonts[basename] = cached_font

self._fonts[cached_font.postscript_name] = cached_font

self._fonts[cached_font.postscript_name.lower()] = cached_font

return cached_font

def _get_offset(self, font, glyph, fontsize, dpi):

if font.postscript_name == 'Cmex10':

return ((glyph.height/64.0/2.0) + (fontsize/3.0 * dpi/72.0))

return 0.

def _get_info(self, fontname, font_class, sym, fontsize, dpi, math=True):

key = fontname, font_class, sym, fontsize, dpi

bunch = self.glyphd.get(key)

if bunch is not None:

return bunch

font, num, symbol_name, fontsize, slanted = \

self._get_glyph(fontname, font_class, sym, fontsize, math)

font.set_size(fontsize, dpi)

glyph = font.load_char(

num,

flags=self.mathtext_backend.get_hinting_type())

xmin, ymin, xmax, ymax = [val/64.0 for val in glyph.bbox]

offset = self._get_offset(font, glyph, fontsize, dpi)

metrics = types.SimpleNamespace(

advance = glyph.linearHoriAdvance/65536.0,

height = glyph.height/64.0,

width = glyph.width/64.0,

xmin = xmin,

xmax = xmax,

ymin = ymin+offset,

ymax = ymax+offset,

# iceberg is the equivalent of TeX's "height"

iceberg = glyph.horiBearingY/64.0 + offset,

slanted = slanted

)

result = self.glyphd[key] = types.SimpleNamespace(

font = font,

fontsize = fontsize,

postscript_name = font.postscript_name,

metrics = metrics,

symbol_name = symbol_name,

num = num,

glyph = glyph,

offset = offset

)

return result

<div class="viewcode-block" id="TruetypeFonts.get_xheight"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.TruetypeFonts.get_xheight">[docs]</a> def get_xheight(self, fontname, fontsize, dpi):

font = self._get_font(fontname)

pclt = font.get_sfnt_table('pclt')

if pclt is None:

# Some fonts don't store the xHeight, so we do a poor man's xHeight

metrics = self.get_metrics(

fontname, rcParams['mathtext.default'], 'x', fontsize, dpi)

return metrics.iceberg

xHeight = (pclt['xHeight'] / 64.0) * (fontsize / 12.0) * (dpi / 100.0)

return xHeight</div>

<div class="viewcode-block" id="TruetypeFonts.get_underline_thickness"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.TruetypeFonts.get_underline_thickness">[docs]</a> def get_underline_thickness(self, font, fontsize, dpi):

# This function used to grab underline thickness from the font

# metrics, but that information is just too un-reliable, so it

# is now hardcoded.

return ((0.75 / 12.0) * fontsize * dpi) / 72.0</div>

<div class="viewcode-block" id="TruetypeFonts.get_kern"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.TruetypeFonts.get_kern">[docs]</a> def get_kern(self, font1, fontclass1, sym1, fontsize1,

if font1 == font2 and fontsize1 == fontsize2:

info1 = self._get_info(font1, fontclass1, sym1, fontsize1, dpi)

info2 = self._get_info(font2, fontclass2, sym2, fontsize2, dpi)

font = info1.font

return font.get_kerning(info1.num, info2.num, KERNING_DEFAULT) / 64

return Fonts.get_kern(self, font1, fontclass1, sym1, fontsize1,

<div class="viewcode-block" id="BakomaFonts"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.BakomaFonts">[docs]</a>class BakomaFonts(TruetypeFonts):

"""

Use the Bakoma TrueType fonts for rendering.

Symbols are strewn about a number of font files, each of which has

its own proprietary 8-bit encoding.

"""

_fontmap = { 'cal' : 'cmsy10',

'rm' : 'cmr10',

'tt' : 'cmtt10',

'it' : 'cmmi10',

'bf' : 'cmb10',

'sf' : 'cmss10',

'ex' : 'cmex10'

}

def __init__(self, *args, **kwargs):

self._stix_fallback = StixFonts(*args, **kwargs)

TruetypeFonts.__init__(self, *args, **kwargs)

self.fontmap = {}

for key, val in self._fontmap.items():

fullpath = findfont(val)

self.fontmap[key] = fullpath

self.fontmap[val] = fullpath

_slanted_symbols = set(r"\int \oint".split())

def _get_glyph(self, fontname, font_class, sym, fontsize, math=True):

symbol_name = None

font = None

if fontname in self.fontmap and sym in latex_to_bakoma:

basename, num = latex_to_bakoma[sym]

slanted = (basename == "cmmi10") or sym in self._slanted_symbols

elif len(sym) == 1:

slanted = (fontname == "it")

if font is not None:

num = ord(sym)

if font is not None:

gid = font.get_char_index(num)

if gid != 0:

symbol_name = font.get_glyph_name(gid)

if symbol_name is None:

return self._stix_fallback._get_glyph(

fontname, font_class, sym, fontsize, math)

return font, num, symbol_name, fontsize, slanted

# The Bakoma fonts contain many pre-sized alternatives for the

# delimiters. The AutoSizedChar class will use these alternatives

# and select the best (closest sized) glyph.

_size_alternatives = {

'(' : [('rm', '('), ('ex', '\xa1'), ('ex', '\xb3'),

('ex', '\xb5'), ('ex', '\xc3')],

')' : [('rm', ')'), ('ex', '\xa2'), ('ex', '\xb4'),

('ex', '\xb6'), ('ex', '\x21')],

'{' : [('cal', '{'), ('ex', '\xa9'), ('ex', '\x6e'),

('ex', '\xbd'), ('ex', '\x28')],

'}' : [('cal', '}'), ('ex', '\xaa'), ('ex', '\x6f'),

('ex', '\xbe'), ('ex', '\x29')],

# The fourth size of '[' is mysteriously missing from the BaKoMa

# font, so I've omitted it for both '[' and ']'

'[' : [('rm', '['), ('ex', '\xa3'), ('ex', '\x68'),

('ex', '\x22')],

']' : [('rm', ']'), ('ex', '\xa4'), ('ex', '\x69'),

('ex', '\x23')],

r'\lfloor' : [('ex', '\xa5'), ('ex', '\x6a'),

('ex', '\xb9'), ('ex', '\x24')],

r'\rfloor' : [('ex', '\xa6'), ('ex', '\x6b'),

('ex', '\xba'), ('ex', '\x25')],

r'\lceil' : [('ex', '\xa7'), ('ex', '\x6c'),

('ex', '\xbb'), ('ex', '\x26')],

r'\rceil' : [('ex', '\xa8'), ('ex', '\x6d'),

('ex', '\xbc'), ('ex', '\x27')],

r'\langle' : [('ex', '\xad'), ('ex', '\x44'),

('ex', '\xbf'), ('ex', '\x2a')],

r'\rangle' : [('ex', '\xae'), ('ex', '\x45'),

('ex', '\xc0'), ('ex', '\x2b')],

r'\__sqrt__' : [('ex', '\x70'), ('ex', '\x71'),

('ex', '\x72'), ('ex', '\x73')],

r'\backslash': [('ex', '\xb2'), ('ex', '\x2f'),

('ex', '\xc2'), ('ex', '\x2d')],

r'/' : [('rm', '/'), ('ex', '\xb1'), ('ex', '\x2e'),

('ex', '\xcb'), ('ex', '\x2c')],

r'\widehat' : [('rm', '\x5e'), ('ex', '\x62'), ('ex', '\x63'),

('ex', '\x64')],

r'\widetilde': [('rm', '\x7e'), ('ex', '\x65'), ('ex', '\x66'),

('ex', '\x67')],

r'<' : [('cal', 'h'), ('ex', 'D')],

r'>' : [('cal', 'i'), ('ex', 'E')]

}

for alias, target in [(r'\leftparen', '('),

(r'\rightparent', ')'),

(r'\leftbrace', '{'),

(r'\rightbrace', '}'),

(r'\leftbracket', '['),

(r'\rightbracket', ']'),

(r'\{', '{'),

(r'\}', '}'),

(r'\[', '['),

(r'\]', ']')]:

_size_alternatives[alias] = _size_alternatives[target]

<div class="viewcode-block" id="BakomaFonts.get_sized_alternatives_for_symbol"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.BakomaFonts.get_sized_alternatives_for_symbol">[docs]</a> def get_sized_alternatives_for_symbol(self, fontname, sym):

return self._size_alternatives.get(sym, [(fontname, sym)])</div></div>

<div class="viewcode-block" id="UnicodeFonts"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.UnicodeFonts">[docs]</a>class UnicodeFonts(TruetypeFonts):

"""

An abstract base class for handling Unicode fonts.

While some reasonably complete Unicode fonts (such as DejaVu) may

work in some situations, the only Unicode font I'm aware of with a

complete set of math symbols is STIX.

This class will "fallback" on the Bakoma fonts when a required

symbol can not be found in the font.

"""

use_cmex = True

# This must come first so the backend's owner is set correctly

if rcParams['mathtext.fallback_to_cm']:

self.cm_fallback = BakomaFonts(*args, **kwargs)

else:

self.cm_fallback = None

self.fontmap = {}

for texfont in "cal rm tt it bf sf".split():

prop = rcParams['mathtext.' + texfont]

font = findfont(prop)

self.fontmap[texfont] = font

prop = FontProperties('cmex10')

font = findfont(prop)

self.fontmap['ex'] = font

def _map_virtual_font(self, fontname, font_class, uniindex):

return fontname, uniindex

found_symbol = False

if self.use_cmex:

uniindex = latex_to_cmex.get(sym)

if uniindex is not None:

fontname = 'ex'

found_symbol = True

if not found_symbol:

try:

uniindex = get_unicode_index(sym, math)

found_symbol = True

except ValueError:

uniindex = ord('?')

_log.warning(

"No TeX to unicode mapping for {!a}.".format(sym))

fontname, uniindex = self._map_virtual_font(

fontname, font_class, uniindex)

new_fontname = fontname

# Only characters in the "Letter" class should be italicized in 'it'

# mode. Greek capital letters should be Roman.

if found_symbol:

if fontname == 'it' and uniindex < 0x10000:

char = chr(uniindex)

if (not unicodedata.category(char)[0] == "L"

or unicodedata.name(char).startswith("GREEK CAPITAL")):

new_fontname = 'rm'

slanted = (new_fontname == 'it') or sym in self._slanted_symbols

found_symbol = False

if font is not None:

glyphindex = font.get_char_index(uniindex)

if glyphindex != 0:

found_symbol = True

if not found_symbol:

if self.cm_fallback:

if isinstance(self.cm_fallback, BakomaFonts):

_log.warning(

"Substituting with a symbol from Computer Modern.")

if (fontname in ('it', 'regular') and

isinstance(self.cm_fallback, StixFonts)):

return self.cm_fallback._get_glyph(

'rm', font_class, sym, fontsize)

else:

return self.cm_fallback._get_glyph(

else:

and isinstance(self, StixFonts)):

return self._get_glyph('rm', font_class, sym, fontsize)

_log.warning("Font {!r} does not have a glyph for {!a} "

"[U+{:x}], substituting with a dummy "

"symbol.".format(new_fontname, sym, uniindex))

fontname = 'rm'

uniindex = 0xA4 # currency char, for lack of anything better

slanted = False

return font, uniindex, symbol_name, fontsize, slanted

<div class="viewcode-block" id="UnicodeFonts.get_sized_alternatives_for_symbol"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.UnicodeFonts.get_sized_alternatives_for_symbol">[docs]</a> def get_sized_alternatives_for_symbol(self, fontname, sym):

if self.cm_fallback:

return self.cm_fallback.get_sized_alternatives_for_symbol(

fontname, sym)

return [(fontname, sym)]</div></div>

<div class="viewcode-block" id="DejaVuFonts"><a class="viewcode-back" href="../../api/mathtext_api.html#matplotlib.mathtext.DejaVuFonts">[docs]</a>class DejaVuFonts(UnicodeFonts):

use_cmex = False

# This must come first so the backend's owner is set correctly

if isinstance(self, DejaVuSerifFonts):

self.cm_fallback = StixFonts(*args, **kwargs)

else:

self.cm_fallback = StixSansFonts(*args, **kwargs)

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