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      <center><h1>Interactive area chart with R and plotly</h1></center>
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      <center><p style="max-width: 600px; margin-top: 40px">The <code>plotly</code> package allows to build interactive charts directly from <code>R</code>. Here is a application to <a href="area-chart.html">area chart</a>, using both the <code>plot_ly()</code> and <code>ggplotly()</code> functions.</p></center>
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         <a class="btn btn-secondary btn-xl text-uppercase js-scroll-trigger" href='https://www.data-to-viz.com/graph/area.html'>About area chart</a>
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<h1 id="using-the-ggplotly-function">Using the <code>ggplotly()</code> function</h1>
<hr />
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<div class="col-md-6 col-sm-12 align-self-center">
<p>This post follows the previous <a href="164-area-chart-ggplot2.html">basic area chart</a> built with <a href="ggplot2.html">ggplot2</a>.</p>
<p>The idea is to turn the chart interactive:</p>
<ul>
<li>You can zoom by selecting an area of interest</li>
<li>Hover the line to get exact time and value</li>
<li>Export to png</li>
<li>Slide axis</li>
<li>Double click to re-initialize.</li>
</ul>
<p>This is done thanks to the <code>ggplotly()</code> function of the <code>plotly</code> package that turn any <code>ggplot2</code> chart object interactive.</p>
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<iframe src="HtmlWidget/ggplotlyAreachart.html" height="700" width="700" style="border:none;">
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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>(ggplot2)</a>
<a class="sourceLine" id="cb1-3" data-line-number="3"><span class="kw">library</span>(dplyr)</a>
<a class="sourceLine" id="cb1-4" data-line-number="4"><span class="kw">library</span>(plotly)</a>
<a class="sourceLine" id="cb1-5" data-line-number="5"><span class="kw">library</span>(hrbrthemes)</a>
<a class="sourceLine" id="cb1-6" data-line-number="6"></a>
<a class="sourceLine" id="cb1-7" data-line-number="7"><span class="co"># Load dataset from github</span></a>
<a class="sourceLine" id="cb1-8" data-line-number="8">data &lt;-<span class="st"> </span><span class="kw">read.table</span>(<span class="st">&quot;https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/3_TwoNumOrdered.csv&quot;</span>, <span class="dt">header=</span>T)</a>
<a class="sourceLine" id="cb1-9" data-line-number="9">data<span class="op">$</span>date &lt;-<span class="st"> </span><span class="kw">as.Date</span>(data<span class="op">$</span>date)</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"># Usual area chart</span></a>
<a class="sourceLine" id="cb1-12" data-line-number="12">p &lt;-<span class="st"> </span>data <span class="op">%&gt;%</span></a>
<a class="sourceLine" id="cb1-13" data-line-number="13"><span class="st">  </span><span class="kw">ggplot</span>( <span class="kw">aes</span>(<span class="dt">x=</span>date, <span class="dt">y=</span>value)) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-14" data-line-number="14"><span class="st">    </span><span class="kw">geom_area</span>(<span class="dt">fill=</span><span class="st">&quot;#69b3a2&quot;</span>, <span class="dt">alpha=</span><span class="fl">0.5</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-15" data-line-number="15"><span class="st">    </span><span class="kw">geom_line</span>(<span class="dt">color=</span><span class="st">&quot;#69b3a2&quot;</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-16" data-line-number="16"><span class="st">    </span><span class="kw">ggtitle</span>(<span class="st">&quot;Evolution of Bitcoin price&quot;</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-17" data-line-number="17"><span class="st">    </span><span class="kw">ylab</span>(<span class="st">&quot;bitcoin price ($)&quot;</span>) <span class="op">+</span></a>
<a class="sourceLine" id="cb1-18" data-line-number="18"><span class="st">    </span><span class="kw">theme_ipsum</span>()</a>
<a class="sourceLine" id="cb1-19" data-line-number="19"></a>
<a class="sourceLine" id="cb1-20" data-line-number="20"><span class="co"># Turn it interactive with ggplotly</span></a>
<a class="sourceLine" id="cb1-21" data-line-number="21">p &lt;-<span class="st"> </span><span class="kw">ggplotly</span>(p)</a>
<a class="sourceLine" id="cb1-22" data-line-number="22">p</a>
<a class="sourceLine" id="cb1-23" data-line-number="23"></a>
<a class="sourceLine" id="cb1-24" data-line-number="24"><span class="co"># save the widget</span></a>
<a class="sourceLine" id="cb1-25" data-line-number="25"><span class="co"># library(htmlwidgets)</span></a>
<a class="sourceLine" id="cb1-26" data-line-number="26"><span class="co"># saveWidget(p, file=paste0( getwd(), &quot;/HtmlWidget/ggplotlyAreachart.html&quot;))</span></a></code></pre></div>
<h1 id="using-plot_ly">Using <code>plot_ly()</code></h1>
<hr />
<div class="row">
<div class="col-md-6 col-sm-12 align-self-center">
<p>The <code>ggplotly()</code> function above takes as input a ggplot2 chart and turn it interactive.</p>
<p>But the <code>plotly</code> package also allows to build interactive charts using its own function: <code>plot_ly()</code>.</p>
<p><u>Pro</u>: it will allows a greater control of chart style. See the whole <a href="https://plot.ly/r/reference/">API</a> for customization.</p>
<p><u>Con</u>: you have to learn a new API, although you probably already know <code>ggplot2</code></p>
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<iframe src="HtmlWidget/plotlyAreachart.html" height="600" width="700" style="border:none;">
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<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb2-1" data-line-number="1"><span class="co"># library</span></a>
<a class="sourceLine" id="cb2-2" data-line-number="2"><span class="kw">library</span>(plotly)</a>
<a class="sourceLine" id="cb2-3" data-line-number="3"> </a>
<a class="sourceLine" id="cb2-4" data-line-number="4"><span class="co"># Create data</span></a>
<a class="sourceLine" id="cb2-5" data-line-number="5">var1 &lt;-<span class="st"> </span><span class="kw">seq</span>(<span class="dv">1</span>,<span class="dv">8</span>)</a>
<a class="sourceLine" id="cb2-6" data-line-number="6">var2 &lt;-<span class="st"> </span><span class="kw">c</span>(<span class="dv">0</span>,<span class="dv">1</span>,<span class="dv">4</span>,<span class="dv">1</span>,<span class="dv">8</span>,<span class="dv">7</span>,<span class="dv">5</span>,<span class="dv">4</span>)</a>
<a class="sourceLine" id="cb2-7" data-line-number="7">var3 &lt;-<span class="st"> </span><span class="kw">c</span>(<span class="dv">7</span>,<span class="dv">8</span>,<span class="dv">4</span>,<span class="dv">2</span>,<span class="dv">1</span>,<span class="dv">2</span>,<span class="dv">0</span>,<span class="dv">1</span>)</a>
<a class="sourceLine" id="cb2-8" data-line-number="8"></a>
<a class="sourceLine" id="cb2-9" data-line-number="9"><span class="co"># Area chart with 2 groups</span></a>
<a class="sourceLine" id="cb2-10" data-line-number="10">p &lt;-<span class="st"> </span><span class="kw">plot_ly</span>(<span class="dt">x =</span> var1, <span class="dt">y =</span> var2, <span class="dt">type=</span><span class="st">&quot;scatter&quot;</span>, <span class="dt">mode=</span><span class="st">&quot;markers&quot;</span>, <span class="dt">fill =</span> <span class="st">&quot;tozeroy&quot;</span>)</a>
<a class="sourceLine" id="cb2-11" data-line-number="11">p &lt;-<span class="st"> </span><span class="kw">add_trace</span>(p, <span class="dt">x =</span> var1, <span class="dt">y =</span> var3, <span class="dt">type=</span><span class="st">&quot;scatter&quot;</span>, <span class="dt">mode=</span><span class="st">&quot;markers&quot;</span>, <span class="dt">fill =</span> <span class="st">&quot;tonexty&quot;</span>)</a>
<a class="sourceLine" id="cb2-12" data-line-number="12">p</a>
<a class="sourceLine" id="cb2-13" data-line-number="13"></a>
<a class="sourceLine" id="cb2-14" data-line-number="14"><span class="co"># save the widget</span></a>
<a class="sourceLine" id="cb2-15" data-line-number="15"><span class="co"># library(htmlwidgets)</span></a>
<a class="sourceLine" id="cb2-16" data-line-number="16"><span class="co"># saveWidget(p, file=paste0( getwd(), &quot;/HtmlWidget/plotlyAreachart.html&quot;))</span></a></code></pre></div>
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