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      <center><h1>Add labels to circular barplot</h1></center>
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      <center><p style="max-width: 600px; margin-top: 40px">This post explains how to add labels on a <a href="ggplot2-package.html">ggplot2</a> circular barchart, on top of each bar. It follows the previous most basic circular barchart.</p></center>
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<p>The <a href="295-basic-circular-barplot.html">chart #295</a> explains how to make a basic <a href="circular-barplot.html">circular barplot</a>. The next step is to add labels to each bar, to give insight to the graphic.</p>
<p>Here I suggest a method to add label at the top of each bar, using the same angle that the central part of the bar. In the code below, a short section creates a dataframe with the feature of each label, that we can then call in <code>geom_text()</code>.</p>
<p>Note that labels are always in an angle that allows to read them easily, what requires a 180 degrees flip for some of them.</p>
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<p><img src="296-add-labels-to-circular-barplot_files/figure-html/thecode-1.png" width="100%" /></p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb1-1" data-line-number="1"><span class="co"># Libraries</span></a>
<a class="sourceLine" id="cb1-2" data-line-number="2"><span class="kw">library</span>(tidyverse)</a>
<a class="sourceLine" id="cb1-3" data-line-number="3"> </a>
<a class="sourceLine" id="cb1-4" data-line-number="4"><span class="co"># Create dataset</span></a>
<a class="sourceLine" id="cb1-5" data-line-number="5">data &lt;-<span class="st"> </span><span class="kw">data.frame</span>(</a>
<a class="sourceLine" id="cb1-6" data-line-number="6">  <span class="dt">id=</span><span class="kw">seq</span>(<span class="dv">1</span>,<span class="dv">60</span>),</a>
<a class="sourceLine" id="cb1-7" data-line-number="7">  <span class="dt">individual=</span><span class="kw">paste</span>( <span class="st">&quot;Mister &quot;</span>, <span class="kw">seq</span>(<span class="dv">1</span>,<span class="dv">60</span>), <span class="dt">sep=</span><span class="st">&quot;&quot;</span>),</a>
<a class="sourceLine" id="cb1-8" data-line-number="8">  <span class="dt">value=</span><span class="kw">sample</span>( <span class="kw">seq</span>(<span class="dv">10</span>,<span class="dv">100</span>), <span class="dv">60</span>, <span class="dt">replace=</span>T)</a>
<a class="sourceLine" id="cb1-9" data-line-number="9">)</a>
<a class="sourceLine" id="cb1-10" data-line-number="10"> </a>
<a class="sourceLine" id="cb1-11" data-line-number="11"><span class="co"># ----- This section prepare a dataframe for labels ---- #</span></a>
<a class="sourceLine" id="cb1-12" data-line-number="12"><span class="co"># Get the name and the y position of each label</span></a>
<a class="sourceLine" id="cb1-13" data-line-number="13">label_data &lt;-<span class="st"> </span>data</a>
<a class="sourceLine" id="cb1-14" data-line-number="14"> </a>
<a class="sourceLine" id="cb1-15" data-line-number="15"><span class="co"># calculate the ANGLE of the labels</span></a>
<a class="sourceLine" id="cb1-16" data-line-number="16">number_of_bar &lt;-<span class="st"> </span><span class="kw">nrow</span>(label_data)</a>
<a class="sourceLine" id="cb1-17" data-line-number="17">angle &lt;-<span class="st">  </span><span class="dv">90</span> <span class="op">-</span><span class="st"> </span><span class="dv">360</span> <span class="op">*</span><span class="st"> </span>(label_data<span class="op">$</span>id<span class="fl">-0.5</span>) <span class="op">/</span>number_of_bar     <span class="co"># I substract 0.5 because the letter must have the angle of the center of the bars. Not extreme right(1) or extreme left (0)</span></a>
<a class="sourceLine" id="cb1-18" data-line-number="18"> </a>
<a class="sourceLine" id="cb1-19" data-line-number="19"><span class="co"># calculate the alignment of labels: right or left</span></a>
<a class="sourceLine" id="cb1-20" data-line-number="20"><span class="co"># If I am on the left part of the plot, my labels have currently an angle &lt; -90</span></a>
<a class="sourceLine" id="cb1-21" data-line-number="21">label_data<span class="op">$</span>hjust&lt;-<span class="kw">ifelse</span>( angle <span class="op">&lt;</span><span class="st"> </span><span class="dv">-90</span>, <span class="dv">1</span>, <span class="dv">0</span>)</a>
<a class="sourceLine" id="cb1-22" data-line-number="22"> </a>
<a class="sourceLine" id="cb1-23" data-line-number="23"><span class="co"># flip angle BY to make them readable</span></a>
<a class="sourceLine" id="cb1-24" data-line-number="24">label_data<span class="op">$</span>angle&lt;-<span class="kw">ifelse</span>(angle <span class="op">&lt;</span><span class="st"> </span><span class="dv">-90</span>, angle<span class="op">+</span><span class="dv">180</span>, angle)</a>
<a class="sourceLine" id="cb1-25" data-line-number="25"><span class="co"># ----- ------------------------------------------- ---- #</span></a>
<a class="sourceLine" id="cb1-26" data-line-number="26"> </a>
<a class="sourceLine" id="cb1-27" data-line-number="27"> </a>
<a class="sourceLine" id="cb1-28" data-line-number="28"><span class="co"># Start the plot</span></a>
<a class="sourceLine" id="cb1-29" data-line-number="29">p &lt;-<span class="st"> </span><span class="kw">ggplot</span>(data, <span class="kw">aes</span>(<span class="dt">x=</span><span class="kw">as.factor</span>(id), <span class="dt">y=</span>value)) <span class="op">+</span><span class="st">       </span><span class="co"># Note that id is a factor. If x is numeric, there is some space between the first bar</span></a>
<a class="sourceLine" id="cb1-30" data-line-number="30"><span class="st">  </span></a>
<a class="sourceLine" id="cb1-31" data-line-number="31"><span class="st">  </span><span class="co"># This add the bars with a blue color</span></a>
<a class="sourceLine" id="cb1-32" data-line-number="32"><span class="st">  </span><span class="kw">geom_bar</span>(<span class="dt">stat=</span><span class="st">&quot;identity&quot;</span>, <span class="dt">fill=</span><span class="kw">alpha</span>(<span class="st">&quot;skyblue&quot;</span>, <span class="fl">0.7</span>)) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-33" data-line-number="33"><span class="st">  </span></a>
<a class="sourceLine" id="cb1-34" data-line-number="34"><span class="st">  </span><span class="co"># Limits of the plot = very important. The negative value controls the size of the inner circle, the positive one is useful to add size over each bar</span></a>
<a class="sourceLine" id="cb1-35" data-line-number="35"><span class="st">  </span><span class="kw">ylim</span>(<span class="op">-</span><span class="dv">100</span>,<span class="dv">120</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-36" data-line-number="36"><span class="st">  </span></a>
<a class="sourceLine" id="cb1-37" data-line-number="37"><span class="st">  </span><span class="co"># Custom the theme: no axis title and no cartesian grid</span></a>
<a class="sourceLine" id="cb1-38" data-line-number="38"><span class="st">  </span><span class="kw">theme_minimal</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-39" data-line-number="39"><span class="st">  </span><span class="kw">theme</span>(</a>
<a class="sourceLine" id="cb1-40" data-line-number="40">    <span class="dt">axis.text =</span> <span class="kw">element_blank</span>(),</a>
<a class="sourceLine" id="cb1-41" data-line-number="41">    <span class="dt">axis.title =</span> <span class="kw">element_blank</span>(),</a>
<a class="sourceLine" id="cb1-42" data-line-number="42">    <span class="dt">panel.grid =</span> <span class="kw">element_blank</span>(),</a>
<a class="sourceLine" id="cb1-43" data-line-number="43">    <span class="dt">plot.margin =</span> <span class="kw">unit</span>(<span class="kw">rep</span>(<span class="op">-</span><span class="dv">1</span>,<span class="dv">4</span>), <span class="st">&quot;cm&quot;</span>)      <span class="co"># Adjust the margin to make in sort labels are not truncated!</span></a>
<a class="sourceLine" id="cb1-44" data-line-number="44">  ) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-45" data-line-number="45"><span class="st">  </span></a>
<a class="sourceLine" id="cb1-46" data-line-number="46"><span class="st">  </span><span class="co"># This makes the coordinate polar instead of cartesian.</span></a>
<a class="sourceLine" id="cb1-47" data-line-number="47"><span class="st">  </span><span class="kw">coord_polar</span>(<span class="dt">start =</span> <span class="dv">0</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-48" data-line-number="48"><span class="st">  </span></a>
<a class="sourceLine" id="cb1-49" data-line-number="49"><span class="st">  </span><span class="co"># Add the labels, using the label_data dataframe that we have created before</span></a>
<a class="sourceLine" id="cb1-50" data-line-number="50"><span class="st">  </span><span class="kw">geom_text</span>(<span class="dt">data=</span>label_data, <span class="kw">aes</span>(<span class="dt">x=</span>id, <span class="dt">y=</span>value<span class="op">+</span><span class="dv">10</span>, <span class="dt">label=</span>individual, <span class="dt">hjust=</span>hjust), <span class="dt">color=</span><span class="st">&quot;black&quot;</span>, <span class="dt">fontface=</span><span class="st">&quot;bold&quot;</span>,<span class="dt">alpha=</span><span class="fl">0.6</span>, <span class="dt">size=</span><span class="fl">2.5</span>, <span class="dt">angle=</span> label_data<span class="op">$</span>angle, <span class="dt">inherit.aes =</span> <span class="ot">FALSE</span> ) </a>
<a class="sourceLine" id="cb1-51" data-line-number="51"> </a>
<a class="sourceLine" id="cb1-52" data-line-number="52">p</a></code></pre></div>
<h1 id="whats-next">What’s next?</h1>
<hr />
<p>Have a look to <a href="297-circular-barplot-with-groups.html">graph #297</a> for a grouped barplot, or check the circular barplot <a href="circular-barplot.html">section</a> for more examples.</p>
<p><a class="btn btn-secondary" href="297-circular-barplot-with-groups.html">Grouped barplot</a> <a class="btn btn-secondary" href="circular-barplot.html">See all examples</a></p>
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