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<div class="section" id="module-matplotlib.dviread">
<span id="matplotlib-dviread"></span><h1><code class="docutils literal notranslate"><span class="pre">matplotlib.dviread</span></code><a class="headerlink" href="#module-matplotlib.dviread" title="Permalink to this headline">¶</a></h1>
<p>A module for reading dvi files output by TeX. Several limitations make
this not (currently) useful as a general-purpose dvi preprocessor, but
it is currently used by the pdf backend for processing usetex text.</p>
<p>Interface:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">with</span> <span class="n">Dvi</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="mi">72</span><span class="p">)</span> <span class="k">as</span> <span class="n">dvi</span><span class="p">:</span>
<span class="c1"># iterate over pages:</span>
<span class="k">for</span> <span class="n">page</span> <span class="ow">in</span> <span class="n">dvi</span><span class="p">:</span>
<span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="p">,</span> <span class="n">d</span> <span class="o">=</span> <span class="n">page</span><span class="o">.</span><span class="n">width</span><span class="p">,</span> <span class="n">page</span><span class="o">.</span><span class="n">height</span><span class="p">,</span> <span class="n">page</span><span class="o">.</span><span class="n">descent</span>
<span class="k">for</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="n">font</span><span class="p">,</span> <span class="n">glyph</span><span class="p">,</span> <span class="n">width</span> <span class="ow">in</span> <span class="n">page</span><span class="o">.</span><span class="n">text</span><span class="p">:</span>
<span class="n">fontname</span> <span class="o">=</span> <span class="n">font</span><span class="o">.</span><span class="n">texname</span>
<span class="n">pointsize</span> <span class="o">=</span> <span class="n">font</span><span class="o">.</span><span class="n">size</span>
<span class="o">...</span>
<span class="k">for</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="n">height</span><span class="p">,</span> <span class="n">width</span> <span class="ow">in</span> <span class="n">page</span><span class="o">.</span><span class="n">boxes</span><span class="p">:</span>
<span class="o">...</span>
</pre></div>
</div>
<dl class="py class">
<dt id="matplotlib.dviread.Dvi">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">Dvi</code><span class="sig-paren">(</span><em><span class="n">filename</span></em>, <em><span class="n">dpi</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#Dvi"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.Dvi" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>A reader for a dvi ("device-independent") file, as produced by TeX.
The current implementation can only iterate through pages in order,
and does not even attempt to verify the postamble.</p>
<p>This class can be used as a context manager to close the underlying
file upon exit. Pages can be read via iteration. Here is an overly
simple way to extract text without trying to detect whitespace:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">with</span> <span class="n">matplotlib</span><span class="o">.</span><span class="n">dviread</span><span class="o">.</span><span class="n">Dvi</span><span class="p">(</span><span class="s1">'input.dvi'</span><span class="p">,</span> <span class="mi">72</span><span class="p">)</span> <span class="k">as</span> <span class="n">dvi</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">for</span> <span class="n">page</span> <span class="ow">in</span> <span class="n">dvi</span><span class="p">:</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s1">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">chr</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">glyph</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">page</span><span class="o">.</span><span class="n">text</span><span class="p">))</span>
</pre></div>
</div>
<p>Read the data from the file named <em>filename</em> and convert
TeX's internal units to units of <em>dpi</em> per inch.
<em>dpi</em> only sets the units and does not limit the resolution.
Use None to return TeX's internal units.</p>
<dl class="py method">
<dt id="matplotlib.dviread.Dvi.close">
<code class="descname">close</code><span class="sig-paren">(</span><em><span class="n">self</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#Dvi.close"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.Dvi.close" title="Permalink to this definition">¶</a></dt>
<dd><p>Close the underlying file if it is open.</p>
</dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.dviread.DviFont">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">DviFont</code><span class="sig-paren">(</span><em><span class="n">scale</span></em>, <em><span class="n">tfm</span></em>, <em><span class="n">texname</span></em>, <em><span class="n">vf</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#DviFont"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.DviFont" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Encapsulation of a font that a DVI file can refer to.</p>
<p>This class holds a font's texname and size, supports comparison,
and knows the widths of glyphs in the same units as the AFM file.
There are also internal attributes (for use by dviread.py) that
are <em>not</em> used for comparison.</p>
<p>The size is in Adobe points (converted from TeX points).</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>scale</strong><span class="classifier">float</span></dt><dd><p>Factor by which the font is scaled from its natural size.</p>
</dd>
<dt><strong>tfm</strong><span class="classifier">Tfm</span></dt><dd><p>TeX font metrics for this font</p>
</dd>
<dt><strong>texname</strong><span class="classifier">bytes</span></dt><dd><p>Name of the font as used internally by TeX and friends, as an
ASCII bytestring. This is usually very different from any external
font names, and <code class="xref py py-class docutils literal notranslate"><span class="pre">dviread.PsfontsMap</span></code> can be used to find
the external name of the font.</p>
</dd>
<dt><strong>vf</strong><span class="classifier">Vf</span></dt><dd><p>A TeX "virtual font" file, or None if this font is not virtual.</p>
</dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Attributes:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>texname</strong><span class="classifier">bytes</span></dt><dd></dd>
<dt><strong>size</strong><span class="classifier">float</span></dt><dd><p>Size of the font in Adobe points, converted from the slightly
smaller TeX points.</p>
</dd>
<dt><strong>widths</strong><span class="classifier">list</span></dt><dd><p>Widths of glyphs in glyph-space units, typically 1/1000ths of
the point size.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py attribute">
<dt id="matplotlib.dviread.DviFont.size">
<code class="descname">size</code><a class="headerlink" href="#matplotlib.dviread.DviFont.size" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.DviFont.texname">
<code class="descname">texname</code><a class="headerlink" href="#matplotlib.dviread.DviFont.texname" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.DviFont.widths">
<code class="descname">widths</code><a class="headerlink" href="#matplotlib.dviread.DviFont.widths" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.dviread.Encoding">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">Encoding</code><span class="sig-paren">(</span><em><span class="n">filename</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#Encoding"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.Encoding" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>Parses a *.enc file referenced from a psfonts.map style file.
The format this class understands is a very limited subset of
PostScript.</p>
<p>Usage (subject to change):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">Encoding</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
<span class="n">whatever</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>filename</strong><span class="classifier">str or path-like</span></dt><dd></dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Attributes:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>encoding</strong><span class="classifier">list</span></dt><dd><p>List of character names</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py attribute">
<dt id="matplotlib.dviread.Encoding.encoding">
<code class="descname">encoding</code><a class="headerlink" href="#matplotlib.dviread.Encoding.encoding" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.PsFont">
<code class="descclassname">matplotlib.dviread.</code><code class="descname">PsFont</code><a class="headerlink" href="#matplotlib.dviread.PsFont" title="Permalink to this definition">¶</a></dt>
<dd><p>alias of <code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dviread.Font</span></code></p>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.dviread.PsfontsMap">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">PsfontsMap</code><a class="reference internal" href="../_modules/matplotlib/dviread.html#PsfontsMap"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.PsfontsMap" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>A psfonts.map formatted file, mapping TeX fonts to PS fonts.</p>
<p>Usage:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">map</span> <span class="o">=</span> <span class="n">PsfontsMap</span><span class="p">(</span><span class="n">find_tex_file</span><span class="p">(</span><span class="s1">'pdftex.map'</span><span class="p">))</span>
<span class="gp">>>> </span><span class="n">entry</span> <span class="o">=</span> <span class="nb">map</span><span class="p">[</span><span class="sa">b</span><span class="s1">'ptmbo8r'</span><span class="p">]</span>
<span class="gp">>>> </span><span class="n">entry</span><span class="o">.</span><span class="n">texname</span>
<span class="go">b'ptmbo8r'</span>
<span class="gp">>>> </span><span class="n">entry</span><span class="o">.</span><span class="n">psname</span>
<span class="go">b'Times-Bold'</span>
<span class="gp">>>> </span><span class="n">entry</span><span class="o">.</span><span class="n">encoding</span>
<span class="go">'/usr/local/texlive/2008/texmf-dist/fonts/enc/dvips/base/8r.enc'</span>
<span class="gp">>>> </span><span class="n">entry</span><span class="o">.</span><span class="n">effects</span>
<span class="go">{'slant': 0.16700000000000001}</span>
<span class="gp">>>> </span><span class="n">entry</span><span class="o">.</span><span class="n">filename</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>filename</strong><span class="classifier">str or path-like</span></dt><dd></dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Notes</p>
<p>For historical reasons, TeX knows many Type-1 fonts by different
names than the outside world. (For one thing, the names have to
fit in eight characters.) Also, TeX's native fonts are not Type-1
but Metafont, which is nontrivial to convert to PostScript except
as a bitmap. While high-quality conversions to Type-1 format exist
and are shipped with modern TeX distributions, we need to know
which Type-1 fonts are the counterparts of which native fonts. For
these reasons a mapping is needed from internal font names to font
file names.</p>
<p>A texmf tree typically includes mapping files called e.g.
<code class="file docutils literal notranslate"><span class="pre">psfonts.map</span></code>, <code class="file docutils literal notranslate"><span class="pre">pdftex.map</span></code>, or <code class="file docutils literal notranslate"><span class="pre">dvipdfm.map</span></code>.
The file <code class="file docutils literal notranslate"><span class="pre">psfonts.map</span></code> is used by <strong class="program">dvips</strong>,
<code class="file docutils literal notranslate"><span class="pre">pdftex.map</span></code> by <strong class="program">pdfTeX</strong>, and <code class="file docutils literal notranslate"><span class="pre">dvipdfm.map</span></code>
by <strong class="program">dvipdfm</strong>. <code class="file docutils literal notranslate"><span class="pre">psfonts.map</span></code> might avoid embedding
the 35 PostScript fonts (i.e., have no filename for them, as in
the Times-Bold example above), while the pdf-related files perhaps
only avoid the "Base 14" pdf fonts. But the user may have
configured these files differently.</p>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.dviread.Tfm">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">Tfm</code><span class="sig-paren">(</span><em><span class="n">filename</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#Tfm"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.Tfm" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p>
<p>A TeX Font Metric file.</p>
<p>This implementation covers only the bare minimum needed by the Dvi class.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">
<dt><strong>filename</strong><span class="classifier">str or path-like</span></dt><dd></dd>
</dl>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Attributes:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>checksum</strong><span class="classifier">int</span></dt><dd><p>Used for verifying against the dvi file.</p>
</dd>
<dt><strong>design_size</strong><span class="classifier">int</span></dt><dd><p>Design size of the font (unknown units)</p>
</dd>
<dt><strong>width, height, depth</strong><span class="classifier">dict</span></dt><dd><p>Dimensions of each character, need to be scaled by the factor
specified in the dvi file. These are dicts because indexing may
not start from 0.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<dl class="py attribute">
<dt id="matplotlib.dviread.Tfm.checksum">
<code class="descname">checksum</code><a class="headerlink" href="#matplotlib.dviread.Tfm.checksum" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.Tfm.depth">
<code class="descname">depth</code><a class="headerlink" href="#matplotlib.dviread.Tfm.depth" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.Tfm.design_size">
<code class="descname">design_size</code><a class="headerlink" href="#matplotlib.dviread.Tfm.design_size" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.Tfm.height">
<code class="descname">height</code><a class="headerlink" href="#matplotlib.dviread.Tfm.height" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="py attribute">
<dt id="matplotlib.dviread.Tfm.width">
<code class="descname">width</code><a class="headerlink" href="#matplotlib.dviread.Tfm.width" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="py class">
<dt id="matplotlib.dviread.Vf">
<em class="property">class </em><code class="descclassname">matplotlib.dviread.</code><code class="descname">Vf</code><span class="sig-paren">(</span><em><span class="n">filename</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#Vf"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.Vf" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#matplotlib.dviread.Dvi" title="matplotlib.dviread.Dvi"><code class="xref py py-class docutils literal notranslate"><span class="pre">matplotlib.dviread.Dvi</span></code></a></p>
<p>A virtual font (*.vf file) containing subroutines for dvi files.</p>
<p>Usage:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vf</span> <span class="o">=</span> <span class="n">Vf</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span>
<span class="n">glyph</span> <span class="o">=</span> <span class="n">vf</span><span class="p">[</span><span class="n">code</span><span class="p">]</span>
<span class="n">glyph</span><span class="o">.</span><span class="n">text</span><span class="p">,</span> <span class="n">glyph</span><span class="o">.</span><span class="n">boxes</span><span class="p">,</span> <span class="n">glyph</span><span class="o">.</span><span class="n">width</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>filename</strong><span class="classifier">str or path-like</span></dt><dd></dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">Notes</p>
<p>The virtual font format is a derivative of dvi:
<a class="reference external" href="http://mirrors.ctan.org/info/knuth/virtual-fonts">http://mirrors.ctan.org/info/knuth/virtual-fonts</a>
This class reuses some of the machinery of <a class="reference internal" href="#matplotlib.dviread.Dvi" title="matplotlib.dviread.Dvi"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Dvi</span></code></a>
but replaces the <code class="xref py py-obj docutils literal notranslate"><span class="pre">_read</span></code> loop and dispatch mechanism.</p>
<p>Read the data from the file named <em>filename</em> and convert
TeX's internal units to units of <em>dpi</em> per inch.
<em>dpi</em> only sets the units and does not limit the resolution.
Use None to return TeX's internal units.</p>
</dd></dl>
<dl class="py function">
<dt id="matplotlib.dviread.find_tex_file">
<code class="descclassname">matplotlib.dviread.</code><code class="descname">find_tex_file</code><span class="sig-paren">(</span><em><span class="n">filename</span></em>, <em><span class="n">format</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/matplotlib/dviread.html#find_tex_file"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#matplotlib.dviread.find_tex_file" title="Permalink to this definition">¶</a></dt>
<dd><p>Find a file in the texmf tree.</p>
<p>Calls <strong class="program">kpsewhich</strong> which is an interface to the kpathsea
library <a class="reference internal" href="#ra043a4f19cd5-1" id="id1">[1]</a>. Most existing TeX distributions on Unix-like systems use
kpathsea. It is also available as part of MikTeX, a popular
distribution on Windows.</p>
<p><em>If the file is not found, an empty string is returned</em>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">
<dt><strong>filename</strong><span class="classifier">str or path-like</span></dt><dd></dd>
<dt><strong>format</strong><span class="classifier">str or bytes</span></dt><dd><p>Used as the value of the <code class="xref py py-obj docutils literal notranslate"><span class="pre">--format</span></code> option to <strong class="program">kpsewhich</strong>.
Could be e.g. 'tfm' or 'vf' to limit the search to that type of files.</p>
</dd>
</dl>
</td>
</tr>
</tbody>
</table>
<p class="rubric">References</p>
<table class="docutils citation" frame="void" id="ra043a4f19cd5-1" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td><a class="reference external" href="http://www.tug.org/kpathsea/">Kpathsea documentation</a>
The library that <strong class="program">kpsewhich</strong> is part of.</td></tr>
</tbody>
</table>
</dd></dl>
</div>
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