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<h1 class="entry-title">ECharts Liquid-fill Chart Tutorial</h1>
<h2><span class="entry-date date published"><time datetime="2017-02-21T00:00:00+08:00">2017-02-21</time></span></h2>
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<div class="entry-content">
<p>Liquid-fill is a type of charts that are suitable for displaying single percentage data. <a href="https://github.com/ecomfe/echarts-liquidfill">ECharts liquid-fill Chart</a> provides fancy presentation of percentage data through single but power configurations.</p>
<iframe style="width: 100%; height: 350px" src="http://gallery.echartsjs.com/view.html?cid=liquidfill-basic"></iframe>
<p>Now, let’s learn how to use it.</p>
<h2 id="step-1-including-javascript-files">Step 1: Including JavaScript Files</h2>
<p>ECharts liquid-fill chart is a <em>plugin</em> for ECharts, which means it is not included in the full version downloaded from official site. This ensures those who don’t need liquid-fill charts can have a smaller package size. When use it, you need to include <code class="highlighter-rouge">echarts-liquidfill.js</code> after <code class="highlighter-rouge">echarts.js</code>, the former of which can be downloaded at <a href="https://github.com/ecomfe/echarts-liquidfill/tree/gh-pages/dist">GitHub</a>.</p>
<div class="language-html highlighter-rouge"><pre class="highlight"><code><span class="nt">&lt;script </span><span class="na">src=</span><span class="s">"echarts.js"</span><span class="nt">&gt;&lt;/script&gt;</span>
<span class="nt">&lt;script </span><span class="na">src=</span><span class="s">"echarts-liquidfill.js"</span><span class="nt">&gt;&lt;/script&gt;</span>
<span class="nt">&lt;script&gt;</span>
<span class="c1">// your code here</span>
<span class="nt">&lt;/script&gt;</span>
</code></pre>
</div>
<h2 id="step-2-assign-dom-element-as-chart-container">Step 2: Assign DOM Element As Chart Container</h2>
<p>We need to assign a DOM element with width and height as chart container, just as we do with other chart types when using ECharts.</p>
<div class="language-html highlighter-rouge"><pre class="highlight"><code><span class="nt">&lt;div</span> <span class="na">id=</span><span class="s">"liquidfill-chart"</span> <span class="na">style=</span><span class="s">"width=100%; height = 400px"</span><span class="nt">&gt;&lt;/div&gt;</span>
</code></pre>
</div>
<p>Use the DOM element to init chart.</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">chart</span> <span class="o">=</span> <span class="nx">echarts</span><span class="p">.</span><span class="nx">init</span><span class="p">(</span><span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'liquidfill-chart'</span><span class="p">));</span>
</code></pre>
</div>
<h2 id="step-3-configure-the-chart">Step 3: Configure The Chart</h2>
<p>We set the chart series <code class="highlighter-rouge">type</code> to be <code class="highlighter-rouge">'liquidFill'</code> to use it.</p>
<p>A simple configuration item may be:</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">option</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">series</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">]</span>
<span class="p">}]</span>
<span class="p">};</span>
<span class="nx">chart</span><span class="p">.</span><span class="nx">setOption</span><span class="p">(</span><span class="nx">option</span><span class="p">);</span>
</code></pre>
</div>
<p>Thus, we can get the liquid-fill chart at the beginning of this post.</p>
<iframe style="width: 100%; height: 350px" src="http://gallery.echartsjs.com/view.html?cid=liquidfill-basic"></iframe>
<blockquote>
<p>If the chart doesn’t display as expected, you may check the following things:</p>
<ul>
<li>Whether JS files are loaded correctly;</li>
<li>Whether <code class="highlighter-rouge">echarts</code> variable exists;</li>
<li>Whether there are error messages in Console;</li>
<li>Whether the DOM element has width and height when init.</li>
</ul>
</blockquote>
<p>As you can see, we only assigned series type to be <code class="highlighter-rouge">'liquidFill'</code>, and set the data to be <code class="highlighter-rouge">[0.6, 0.5, 0.4, 0.3]</code>, which generate the four waves in the chart. Other parameters are all by default.</p>
<p>Even without much configuration, you may get an elegant liquid-fill chart with default parameters. And if you have specific demands, you may easily acheive them with our configuration. Here is how to customerize it.</p>
<h2 id="step-4-customerize-the-chart">Step 4: Customerize The Chart</h2>
<p>ECharts liquid-fill chart supports highly customizable configuration, including color, radius, amplitude, wave length, phase, period, wave direction, shape, wave animation and so on. Full configuration please refer to <a href="https://github.com/ecomfe/echarts-liquidfill#api">API</a>. Here, we are going to introduces some important parameters.</p>
<h3 id="shape-and-animation">Shape And Animation</h3>
<iframe style="width: 100%; height: 600px" src="http://gallery.echartsjs.com/view.html?cid=xry0tUfcBe"></iframe>
<p>Besides the default <code class="highlighter-rouge">'circle'</code> shape, it also supports symbols like <code class="highlighter-rouge">'rect'</code>, <code class="highlighter-rouge">'roundRect'</code>, <code class="highlighter-rouge">'triangle'</code>, <code class="highlighter-rouge">'diamond'</code>, <code class="highlighter-rouge">'pin'</code>, and <code class="highlighter-rouge">'arrow'</code>. Even more, you can set it to be an <a href="http://gallery.echartsjs.com/editor.html?c=liquidfill-echarts">SVG path</a> to get some fancy effect.</p>
<iframe style="width: 100%; height: 400px" src="http://gallery.echartsjs.com/view.html?cid=liquidfill-echarts"></iframe>
<p>By setting <code class="highlighter-rouge">direction</code> to be <code class="highlighter-rouge">'left'</code> or <code class="highlighter-rouge">'right'</code>, we may assign the moving direction of the wave. Or, we can set it to be <code class="highlighter-rouge">'none'</code> for still.</p>
<p>Full configuration of the above is:</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="c1">// run at: http://gallery.echartsjs.com/editor.html?c=xry0tUfcBe</span>
<span class="kd">var</span> <span class="nx">option</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">series</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">radius</span><span class="p">:</span> <span class="s1">'40%'</span><span class="p">,</span>
<span class="na">shape</span><span class="p">:</span> <span class="s1">'diamond'</span><span class="p">,</span>
<span class="na">center</span><span class="p">:</span> <span class="p">[</span><span class="s1">'25%'</span><span class="p">,</span> <span class="s1">'25%'</span><span class="p">]</span>
<span class="p">},</span> <span class="p">{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">direction</span><span class="p">:</span> <span class="s1">'left'</span><span class="p">,</span>
<span class="na">radius</span><span class="p">:</span> <span class="s1">'40%'</span><span class="p">,</span>
<span class="na">shape</span><span class="p">:</span> <span class="s1">'rect'</span><span class="p">,</span>
<span class="na">center</span><span class="p">:</span> <span class="p">[</span><span class="s1">'75%'</span><span class="p">,</span> <span class="s1">'25%'</span><span class="p">]</span>
<span class="p">},</span> <span class="p">{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">radius</span><span class="p">:</span> <span class="s1">'40%'</span><span class="p">,</span>
<span class="na">shape</span><span class="p">:</span> <span class="s1">'roundRect'</span><span class="p">,</span>
<span class="na">center</span><span class="p">:</span> <span class="p">[</span><span class="s1">'25%'</span><span class="p">,</span> <span class="s1">'75%'</span><span class="p">],</span>
<span class="na">backgroundStyle</span><span class="p">:</span> <span class="p">{</span>
<span class="na">borderColor</span><span class="p">:</span> <span class="s1">'#156ACF'</span><span class="p">,</span>
<span class="na">borderWidth</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span>
<span class="na">shadowColor</span><span class="p">:</span> <span class="s1">'rgba(0, 0, 0, 0.4)'</span><span class="p">,</span>
<span class="na">shadowBlur</span><span class="p">:</span> <span class="mi">20</span>
<span class="p">},</span>
<span class="na">outline</span><span class="p">:</span> <span class="p">{</span>
<span class="na">show</span><span class="p">:</span> <span class="kc">false</span>
<span class="p">},</span>
<span class="na">waveAnimation</span><span class="p">:</span> <span class="kc">false</span><span class="p">,</span> <span class="c1">// disable moving</span>
<span class="p">},</span> <span class="p">{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">radius</span><span class="p">:</span> <span class="s1">'50%'</span><span class="p">,</span>
<span class="na">shape</span><span class="p">:</span> <span class="s1">'pin'</span><span class="p">,</span>
<span class="na">center</span><span class="p">:</span> <span class="p">[</span><span class="s1">'75%'</span><span class="p">,</span> <span class="s1">'75%'</span><span class="p">],</span>
<span class="na">amplitude</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span>
<span class="na">waveAnimation</span><span class="p">:</span> <span class="kc">false</span><span class="p">,</span>
<span class="na">outline</span><span class="p">:</span> <span class="p">{</span>
<span class="na">show</span><span class="p">:</span> <span class="kc">false</span>
<span class="p">},</span>
<span class="na">backgroundStyle</span><span class="p">:</span> <span class="p">{</span>
<span class="na">shadowColor</span><span class="p">:</span> <span class="s1">'rgba(0, 0, 0, 0.4)'</span><span class="p">,</span>
<span class="na">shadowBlur</span><span class="p">:</span> <span class="mi">20</span>
<span class="p">}</span>
<span class="p">}]</span>
<span class="p">};</span>
</code></pre>
</div>
<h3 id="configuration-for-a-single-wave">Configuration For A Single Wave</h3>
<p>Besides the configuration of the waves as introduced above, each single wave can have configuration to be overwritten.</p>
<iframe style="width: 100%; height: 350px" src="http://gallery.echartsjs.com/view.html?cid=xry6CHNCVl"></iframe>
<p>In this example, we set the second wave to be red, and changed its moving direction.</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">option</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">series</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.6</span><span class="p">,</span> <span class="p">{</span>
<span class="na">value</span><span class="p">:</span> <span class="mf">0.5</span><span class="p">,</span>
<span class="na">direction</span><span class="p">:</span> <span class="s1">'left'</span><span class="p">,</span>
<span class="na">itemStyle</span><span class="p">:</span> <span class="p">{</span>
<span class="na">normal</span><span class="p">:</span> <span class="p">{</span>
<span class="na">color</span><span class="p">:</span> <span class="s1">'red'</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">},</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">]</span>
<span class="p">}]</span>
<span class="p">};</span>
</code></pre>
</div>
<p>You may notice that an item of the previous <code class="highlighter-rouge">data</code> is a number, but for those to be configured, they are an object containing <code class="highlighter-rouge">value</code>.</p>
<h2 id="label">Label</h2>
<p>Label of liquid-fill charts have a nice effect that the text colors before wave and background are different. <code class="highlighter-rouge">insideColor</code> can be used to set the text color before wave, and <code class="highlighter-rouge">color</code> can be used to set the color before background.</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">option</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">series</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">radius</span><span class="p">:</span> <span class="s1">'80%'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.45</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">label</span><span class="p">:</span> <span class="p">{</span>
<span class="na">normal</span><span class="p">:</span> <span class="p">{</span>
<span class="na">textStyle</span><span class="p">:</span> <span class="p">{</span>
<span class="na">color</span><span class="p">:</span> <span class="s1">'red'</span><span class="p">,</span>
<span class="na">insideColor</span><span class="p">:</span> <span class="s1">'yellow'</span><span class="p">,</span>
<span class="na">fontSize</span><span class="p">:</span> <span class="mi">50</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}]</span>
<span class="p">};</span>
</code></pre>
</div>
<iframe style="width: 100%; height: 350px" src="http://gallery.echartsjs.com/view.html?cid=xHyUvV_tFe"></iframe>
<p>Label displays percentage data by default. If you want to set it otherwise, you may use <code class="highlighter-rouge">formatter</code> to do this. This is similar to other formatter of ECharts.</p>
<p><code class="highlighter-rouge">formatter</code> can be a string, in which <code class="highlighter-rouge">'{a}'</code>, <code class="highlighter-rouge">'{b}'</code>, <code class="highlighter-rouge">'{c}'</code> will be replaced to be series name, data name, and data value.</p>
<p>For example:</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">option</span> <span class="o">=</span> <span class="p">{</span>
<span class="na">series</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">type</span><span class="p">:</span> <span class="s1">'liquidFill'</span><span class="p">,</span>
<span class="na">name</span><span class="p">:</span> <span class="s1">'Liquid Fill'</span><span class="p">,</span>
<span class="na">data</span><span class="p">:</span> <span class="p">[{</span>
<span class="na">name</span><span class="p">:</span> <span class="s1">'First Data'</span><span class="p">,</span>
<span class="na">value</span><span class="p">:</span> <span class="mf">0.6</span>
<span class="p">},</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">],</span>
<span class="na">label</span><span class="p">:</span> <span class="p">{</span>
<span class="na">normal</span><span class="p">:</span> <span class="p">{</span>
<span class="na">formatter</span><span class="p">:</span> <span class="s1">'{a}\n{b}\nValue: {c}'</span><span class="p">,</span>
<span class="na">textStyle</span><span class="p">:</span> <span class="p">{</span>
<span class="na">fontSize</span><span class="p">:</span> <span class="mi">28</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}]</span>
<span class="p">};</span>
</code></pre>
</div>
<iframe style="width: 100%; height: 350px" src="http://gallery.echartsjs.com/view.html?cid=xHk5831cHg"></iframe>
<p>Besides, <code class="highlighter-rouge">formatter</code> can also be a function. The following code provides the same effect as before.</p>
<div class="language-js highlighter-rouge"><pre class="highlight"><code><span class="nx">formatter</span><span class="err">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">param</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">param</span><span class="p">.</span><span class="nx">seriesName</span> <span class="o">+</span> <span class="s1">'\n'</span>
<span class="o">+</span> <span class="nx">param</span><span class="p">.</span><span class="nx">name</span> <span class="o">+</span> <span class="s1">'\n'</span>
<span class="o">+</span> <span class="s1">'Value:'</span> <span class="o">+</span> <span class="nx">param</span><span class="p">.</span><span class="nx">value</span><span class="p">;</span>
<span class="p">}</span>
</code></pre>
</div>
<h2 id="conclusion">Conclusion</h2>
<p>In this post, we introduced how to use ECharts liquid-fill charts. Hopefully, you can be inspired by it and create more interesting works.</p>
<p>Full document please refer to <a href="https://github.com/ecomfe/echarts-liquidfill">GitHub</a>. And you may go to <a href="http://gallery.echartsjs.com/explore.html#sort=rank~timeframe=all~query=liquidFill~author=all">ECharts Gallery</a> to view more liquid-fill charts.</p>
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