matplotlib.mathtext

A module for parsing a subset of the TeX math syntax and rendering it to a Matplotlib backend.

For a tutorial of its usage, see Writing mathematical expressions. This document is primarily concerned with implementation details.

The module uses pyparsing to parse the TeX expression.

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.

class matplotlib.mathtext.MathTextParser(output)

Bases: object

Create a MathTextParser for the given backend output.

get_depth(texstr, dpi=120, fontsize=14)

[Deprecated] Get the depth of a mathtext string.

Parameters

texstrstr

A valid mathtext string, e.g., r'IQ: $sigma_i=15$'.

dpifloat

The dots-per-inch setting used to render the text.

Returns

int

Offset of the baseline from the bottom of the image, in pixels.

Notes

Deprecated since version 3.4.

parse(s, dpi=72, prop=None, *, _force_standard_ps_fonts=False)

Parse the given math expression s at the given dpi. If prop is provided, it is a FontProperties object specifying the "default" font to use in the math expression, used for all non-math text.

The results are cached, so multiple calls to parse with the same expression should be fast.

to_mask(texstr, dpi=120, fontsize=14)

[Deprecated] Convert a mathtext string to a grayscale array and depth.

Parameters

texstrstr

A valid mathtext string, e.g., r'IQ: $sigma_i=15$'.

dpifloat

The dots-per-inch setting used to render the text.

fontsizeint

The font size in points

Returns

array2D uint8 alpha

Mask array of rasterized tex.

depthint

Offset of the baseline from the bottom of the image, in pixels.

Notes

Deprecated since version 3.4.

to_png(filename, texstr, color='black', dpi=120, fontsize=14)

[Deprecated] Render a tex expression to a PNG file.

Parameters

filename

A writable filename or fileobject.

texstrstr

A valid mathtext string, e.g., r'IQ: $sigma_i=15$'.

colorcolor

The text color.

dpifloat

The dots-per-inch setting used to render the text.

fontsizeint

The font size in points.

Returns

int

Offset of the baseline from the bottom of the image, in pixels.

Notes

Deprecated since version 3.4.

to_rgba(texstr, color='black', dpi=120, fontsize=14)

[Deprecated] Convert a mathtext string to an RGBA array and depth.

Parameters

texstrstr

A valid mathtext string, e.g., r'IQ: $sigma_i=15$'.

colorcolor

The text color.

dpifloat

The dots-per-inch setting used to render the text.

fontsizeint

The font size in points.

Returns

array(M, N, 4) array

RGBA color values of rasterized tex, colorized with color.

depthint

Offset of the baseline from the bottom of the image, in pixels.

Notes

Deprecated since version 3.4.

exception matplotlib.mathtext.MathTextWarning

Bases: Warning

class matplotlib.mathtext.MathtextBackend

Bases: object

The base class for the mathtext backend-specific code. MathtextBackend subclasses interface between mathtext and specific Matplotlib graphics backends.

Subclasses need to override the following:

• render_glyph()

• render_rect_filled()

• get_results()

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

• get_hinting_type()

get_hinting_type()

Get the FreeType hinting type to use with this particular backend.

get_results(box)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

set_canvas_size(w, h, d)

Set the dimension of the drawing canvas.

class matplotlib.mathtext.MathtextBackendAgg

Bases: matplotlib.mathtext.MathtextBackend

Render glyphs and rectangles to an FTImage buffer, which is later transferred to the Agg image by the Agg backend.

get_hinting_type()

Get the FreeType hinting type to use with this particular backend.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

set_canvas_size(w, h, d)

Set the dimension of the drawing canvas.

class matplotlib.mathtext.MathtextBackendBitmap

Bases: matplotlib.mathtext.MathtextBackendAgg

[Deprecated]

Notes

Deprecated since version 3.4:

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

class matplotlib.mathtext.MathtextBackendCairo

Bases: matplotlib.mathtext.MathtextBackend

[Deprecated] Store information to write a mathtext rendering to the Cairo backend.

Notes

Deprecated since version 3.4.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

class matplotlib.mathtext.MathtextBackendPath

Bases: matplotlib.mathtext.MathtextBackend

Store information to write a mathtext rendering to the text path machinery.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

class matplotlib.mathtext.MathtextBackendPdf

Bases: matplotlib.mathtext.MathtextBackend

[Deprecated] Store information to write a mathtext rendering to the PDF backend.

Notes

Deprecated since version 3.4.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

class matplotlib.mathtext.MathtextBackendPs

Bases: matplotlib.mathtext.MathtextBackend

[Deprecated] Store information to write a mathtext rendering to the PostScript backend.

Notes

Deprecated since version 3.4.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

class matplotlib.mathtext.MathtextBackendSvg

Bases: matplotlib.mathtext.MathtextBackend

[Deprecated] Store information to write a mathtext rendering to the SVG backend.

Notes

Deprecated since version 3.4.

get_results(box, used_characters)

Return a backend-specific tuple to return to the backend after all processing is done.

render_glyph(ox, oy, info)

Draw a glyph described by info to the reference point (ox, oy).

render_rect_filled(x1, y1, x2, y2)

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

matplotlib.mathtext.get_unicode_index(symbol, math=True)

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

Parameters

symbolstr

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

mathbool, default: True

If False, always treat as a single unicode character.

matplotlib.mathtext.math_to_image(s, filename_or_obj, prop=None, dpi=None, format=None)

Given a math expression, renders it in a closely-clipped bounding box to an image file.

Parameters

sstr

A math expression. The math portion must be enclosed in dollar signs.

filename_or_objstr or path-like or file-like

Where to write the image data.

propFontProperties, optional

The size and style of the text.

dpifloat, optional

The output dpi. If not set, the dpi is determined as for Figure.savefig.

formatstr, optional

The output format, e.g., 'svg', 'pdf', 'ps' or 'png'. If not set, the format is determined as for Figure.savefig.

matplotlib.mathtext.ship(ox, oy, box)

[Deprecated]

Notes

Deprecated since version 3.4: