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essence, it calls png(), then func(), then dev.off().
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So func must be a function that will generate a plot when used this
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<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="">1.7.2</span>
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</header><div class="row">
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<div class="col-md-9 contents">
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<div class="page-header">
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<h1>Run a plotting function and save the output as a PNG</h1>
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<small class="dont-index">Source: <a href="https://github.com/rstudio/shiny/blob/HEAD/R/imageutils.R" class="external-link"><code>R/imageutils.R</code></a></small>
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<div class="hidden name"><code>plotPNG.Rd</code></div>
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</div>
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<div class="ref-description">
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<p>This function returns the name of the PNG file that it generates. In
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essence, it calls <code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">png()</a></code>, then <code>func()</code>, then <code><a href="https://rdrr.io/r/grDevices/dev.html" class="external-link">dev.off()</a></code>.
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So <code>func</code> must be a function that will generate a plot when used this
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way.</p>
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</div>
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<div id="ref-usage">
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="fu">plotPNG</span><span class="op">(</span>
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<span class="va">func</span>,
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filename <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/tempfile.html" class="external-link">tempfile</a></span><span class="op">(</span>fileext <span class="op">=</span> <span class="st">".png"</span><span class="op">)</span>,
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width <span class="op">=</span> <span class="fl">400</span>,
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height <span class="op">=</span> <span class="fl">400</span>,
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res <span class="op">=</span> <span class="fl">72</span>,
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<span class="va">...</span>
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<span class="op">)</span></code></pre></div>
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</div>
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<div id="arguments">
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<h2>Arguments</h2>
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<dl><dt>func</dt>
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<dd><p>A function that generates a plot.</p></dd>
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<dt>filename</dt>
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<dd><p>The name of the output file. Defaults to a temp file with
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extension <code>.png</code>.</p></dd>
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<dt>width</dt>
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<dd><p>Width in pixels.</p></dd>
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<dt>height</dt>
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<dd><p>Height in pixels.</p></dd>
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<dt>res</dt>
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<dd><p>Resolution in pixels per inch. This value is passed to
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<code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">grDevices::png()</a></code>. Note that this affects the resolution of PNG rendering in
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R; it won't change the actual ppi of the browser.</p></dd>
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<dt>...</dt>
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<dd><p>Arguments to be passed through to <code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">grDevices::png()</a></code>.
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These can be used to set the width, height, background color, etc.</p></dd>
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</dl></div>
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<div id="details">
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<h2>Details</h2>
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<p>For output, it will try to use the following devices, in this order:
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quartz (via <code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">grDevices::png()</a></code>), then <code><a href="https://rdrr.io/pkg/Cairo/man/Cairo.html" class="external-link">Cairo::CairoPNG()</a></code>,
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and finally <code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">grDevices::png()</a></code>. This is in order of quality of
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output. Notably, plain <code>png</code> output on Linux and Windows may not
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antialias some point shapes, resulting in poor quality output.</p>
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<p>In some cases, <code>Cairo()</code> provides output that looks worse than
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<code><a href="https://rdrr.io/r/grDevices/png.html" class="external-link">png()</a></code>. To disable Cairo output for an app, use
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<code>options(shiny.usecairo=FALSE)</code>.</p>
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<nav id="toc" data-toggle="toc" class="sticky-top"><h2 data-toc-skip>Contents</h2>
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<p></p><p>Developed by Winston Chang, Joe Cheng, JJ Allaire, Carson Sievert, Barret Schloerke, Yihui Xie, Jeff Allen, Jonathan McPherson, Alan Dipert, Barbara Borges.</p>
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<p></p><p>Site built with <a href="https://pkgdown.r-lib.org/" class="external-link">pkgdown</a> 2.0.4.</p>
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