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<h1 id="latex-and-typst"><a class="header" href="#latex-and-typst">LaTeX and typst</a></h1>
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<p><code>latex</code> and <code>typst</code> code blocks can be marked with the <code>+render</code> attribute (see <a href="highlighting.html">highlighting</a>) to have
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them rendered into images when the presentation is loaded. This allows you to define formulas in text rather than having
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to define them somewhere else, transform them into an image, and them embed it.</p>
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<p>For example, the following presentation:</p>
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<pre><code># Formulas
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```latex +render
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\[ \sum_{n=1}^{\infty} 2^{-n} = 1 \]
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```
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</code></pre>
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<p>Would be rendered like this:</p>
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<p><img src="../../assets/formula.png" alt="" /></p>
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<h2 id="dependencies"><a class="header" href="#dependencies">Dependencies</a></h2>
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<h3 id="typst"><a class="header" href="#typst">typst</a></h3>
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<p>The engine used to render both of these languages is <a href="https://github.com/typst/typst">typst</a>. <em>typst</em> is easy to
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install, lightweight, and boilerplate free as compared to <em>LaTeX</em>.</p>
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<h3 id="pandoc"><a class="header" href="#pandoc">pandoc</a></h3>
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<p>For <em>LaTeX</em> code rendering both <em>typst</em> and <a href="https://github.com/jgm/pandoc">pandoc</a> are required. How this works is the
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<em>LaTeX</em> code you write gets transformed into <em>typst</em> code via <em>pandoc</em> and then rendered by using <em>typst</em>. This lets us:</p>
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<ul>
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<li>Have the same look/feel on generated formulas for both languages.</li>
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<li>Avoid having to write lots of boilerplate <em>LaTeX</em> to make rendering for that language work.</li>
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<li>Have the same logic to render formulas for both languages, except with a small preparation step for <em>LaTeX</em>.</li>
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</ul>
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<h2 id="controlling-ppi"><a class="header" href="#controlling-ppi">Controlling PPI</a></h2>
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<p><em>presenterm</em> lets you define how many Pixels Per Inch (PPI) you want in the generated images. This is important because
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as opposed to images that you manually include in your presentation, where you control the exact dimensions, the images
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generated on the fly will have a fixed size. Configuring the PPI used during the conversion can let you adjust this: the
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higher the PPI, the larger the generated images will be.</p>
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<p>Because as opposed to most configurations this is a very environment-specific config, the PPI parameter is not part of
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the theme definition but is instead has to be set in <em>presenterm</em>'s <a href="../../configuration/introduction.html">config file</a>:</p>
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<pre><code class="language-yaml">typst:
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ppi: 400
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</code></pre>
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<p>The default is 300 so adjust it and see what works for you.</p>
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<h2 id="image-paths"><a class="header" href="#image-paths">Image paths</a></h2>
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<p>If you're including an image inside a <em>typst</em> snippet, you must:</p>
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<ul>
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<li>Use absolute paths, e.g. <code>#image("/image1.png")</code>.</li>
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<li>Place the image in the same or a sub path of the path where the presentation is. That is, if your presentation file is
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at <code>/tmp/foo/presentation.md</code>, you can place images in <code>/tmp/foo</code>, and <code>/tmp/foo/bar</code> but not under <code>/tmp/bar</code>. This is
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because of the absolute path rule above: the path will be considered to be relative to the presentation file's
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directory.</li>
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</ul>
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<h2 id="controlling-the-image-size"><a class="header" href="#controlling-the-image-size">Controlling the image size</a></h2>
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<p>You can also set the generated image's size on a per code snippet basis by using the <code>+width</code> modifier which specifies
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the width of the image as a percentage of the terminal size.</p>
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<pre><code class="language-markdown">```typst +render +width:50%
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$f(x) = x + 1$
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```
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</code></pre>
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<h2 id="customizations"><a class="header" href="#customizations">Customizations</a></h2>
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<p>The colors and margin of the generated images can be defined in your theme:</p>
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<pre><code class="language-yaml">typst:
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colors:
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background: ff0000
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foreground: 00ff00
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# In points
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horizontal_margin: 2
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vertical_margin: 2
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</code></pre>
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