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class="nav-item"><a href="/handbook/en/concepts/event" class="nav-link"><span class="title">Event and Action</span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">Application</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a class="nav-link"><span class="title">Common Charts</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><!----><li class="nav-item"><a class="nav-link"><span class="title">Cross Platform</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">Data</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">Label</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">Interaction</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">Best Practice</span></div> <ul class="nav bd-sidenav level1"><!----><li class="nav-item"><a href="/handbook/en/best-practice/canvas-vs-svg" class="nav-link"><span class="title">Canvas vs. SVG</span></a> <!----></li><li class="nav-item"><a href="/handbook/en/best-practice/aria" class="nav-link"><span class="title">Aria</span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">Edit Handbook</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a href="/handbook/en/meta/edit-guide" class="nav-link"><span class="title">Edit Guide</span></a> <!----></li></ul></li></ul></div></div> <div class="bd-content col-sm-7 pl-sm-2 col-12"><div class="post-content content"><div><div class="post-inner"><div class="nuxt-content"><h1 id="visual-map-of-data"><a href="#visual-map-of-data" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>Visual Map of Data</h1> |
| <p>Data visualization is a procedure of mapping data into visual elements. This procedure can also be called visual coding, and visual elements can also be called visual channels.</p> |
| <p>Every type of charts in Apache ECharts<sup>TM</sup> has this built-in mapping procedure. For example, line chart map data into <em>lines</em>, bar chart map data into <em>height</em>. Some more complicated charts, like <code>graph</code>, <code>themeRiver</code>, and <code>treemap</code> have their own built-in mapping.</p> |
| <p>Besides, ECharts provides <a href="https://echarts.apache.org/option.html#visualMap" rel="nofollow noopener noreferrer" target="_blank">visualMap component</a> for general visual mapping. Visual elements allowed in <code>visualMap</code> component are:</p> |
| <ul> |
| <li><code>symbol</code>, <code>symbolSize</code></li> |
| <li><code>color</code>, <code>opacity</code>, <code>colorAlpha</code>,</li> |
| <li><code>colorLightness</code>, <code>colorSaturation</code>, <code>colorHue</code></li> |
| </ul> |
| <p>Next, we are going to introduce how to use <code>visualMap</code> component.</p> |
| <h2 id="data-and-dimension"><a href="#data-and-dimension" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>Data and Dimension</h2> |
| <p>Data are usually stored in <a href="https://echarts.apache.org/option.html#series.data" rel="nofollow noopener noreferrer" target="_blank">series.data</a> in ECharts. Depending on chart types, like list, tree, graph, and so on, the form of data may vary somehow. But they have one common feature, that they are a collection of data items. Every data item contains data value, and other information if needed. Every data value can be a single value (one dimension) or an array (multiple dimensions).</p> |
| <p>For example, <a href="https://echarts.apache.org/option.html#series.data" rel="nofollow noopener noreferrer" target="_blank">series.data</a> is the most common form, which is a <code>list</code>, a common array:</p> |
| <div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div> |
| <div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div> |
| <p>Usually the first one or two dimensions are used for mapping. For example, map the first dimension to x axis, and the second dimension to y axis. If you want to represent more dimensions, <code>visualMap</code> is what you need. Most likely, <a href="https://echarts.apache.org/option.html#series-scatter" rel="nofollow noopener noreferrer" target="_blank">scatter charts</a> use radius to represent the third dimension.</p> |
| <h2 id="the-visualmap-component"><a href="#the-visualmap-component" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>The visualMap Component</h2> |
| <p>visualMap component defines the mapping from <em>which dimension of data</em> to <em>what visual elements</em>.</p> |
| <p>The following two types of visualMap components are supported, identified with <a href="https://echarts.apache.org/option.html#visualMap.type" rel="nofollow noopener noreferrer" target="_blank">visualMap.type</a>.</p> |
| <p>Its structure is defined as:</p> |
| <div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div> |
| <h2 id="continuous-and-piecewise-visual-mapping-components"><a href="#continuous-and-piecewise-visual-mapping-components" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>Continuous and Piecewise Visual Mapping Components</h2> |
| <p>The visual mapping component of ECharts is divided into continuous (<a href="https://echarts.apache.org/option.html#visualMap-continuous" rel="nofollow noopener noreferrer" target="_blank">visualMapContinuous</a>) and piecewise (<a href="https://echarts.apache.org/option.html#visualMap-piecewise" rel="nofollow noopener noreferrer" target="_blank">visualMapPiecewise</a>).</p> |
| <p>Continuous means that the data dimension for visual mapping is a continuous value, while piecewise means that the data is divided into multiple segments or discrete data.</p> |
| <h3 id="continuous-visual-mapping"><a href="#continuous-visual-mapping" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>Continuous Visual Mapping</h3> |
| <p>Continuous type visual mapping can determine the range of visual mapping by specifying the maximum and minimum values.</p> |
| <div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div> |
| <p>where <a href="https://echarts.apache.org/option.html#visualMap.inRange" rel="nofollow noopener noreferrer" target="_blank">visualMap.inRange</a> indicates the style used for data within the data mapping range; while <a href="https://echarts.apache.org/option.html#visualMap.outOfRange" rel="nofollow noopener noreferrer" target="_blank">visualMap.outOfRange</a> specifies the style for data outside the mapping range.</p> |
| <p><a href="~visualMap.dimension">visualMap.dimension</a> specifies which dimension of the data will be visually mapped.</p> |
| <h3 id="piecewise-visual-mapping"><a href="#piecewise-visual-mapping" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>Piecewise Visual Mapping</h3> |
| <p>The piecewise visual mapping component has three modes.</p> |
| <ul> |
| <li>Continuous data average segmentation: based on <a href="https://echarts.apache.org/option.html#visualMap-piecewise.splitNumber" rel="nofollow noopener noreferrer" target="_blank">visualMap-piecewise.splitNumber</a> to automatically split the data into pieces equally.</li> |
| <li>Continuous data custom segmentation: define the range of each piece based on <a href="https://echarts.apache.org/option.html#visualMap-piecewise.pieces" rel="nofollow noopener noreferrer" target="_blank">visualMap-piecewise.pieces</a>.</li> |
| <li>Discrete data (categorical data): categories are defined in <a href="https://echarts.apache.org/option.html#visualMap-piecewise.categories" rel="nofollow noopener noreferrer" target="_blank">visualMap-piecewise.categories</a>.</li> |
| </ul> |
| <p>To use segmented visual map, you need to set <code>type</code> to <code>'piecewise'</code> and choose one of the above three configuration items.</p></div> <div class="table-of-contents"><h4 class="toc-container-header">In This Page</h4> <ul><li class="toc2"><a href="/handbook/en/concepts/visual-map#data-and-dimension">Data and Dimension</a></li><li class="toc2"><a href="/handbook/en/concepts/visual-map#the-visualmap-component">The visualMap Component</a></li><li class="toc2"><a href="/handbook/en/concepts/visual-map#continuous-and-piecewise-visual-mapping-components">Continuous and Piecewise Visual Mapping Components</a></li><li class="toc3"><a href="/handbook/en/concepts/visual-map#continuous-visual-mapping">Continuous Visual Mapping</a></li><li class="toc3"><a href="/handbook/en/concepts/visual-map#piecewise-visual-mapping">Piecewise Visual Mapping</a></li></ul></div></div> <div class="post-contributors"><h3><span class="inline-block align-middle">本文贡献者</span> <a target="_blank" href="https://github.com/apache/echarts-handbook/tree/master/contents/en/concepts/visual-map.md" title="编辑本文" class="inline-block align-middle text-sm"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-8 w-8 inline-block align-middle"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span class="inline-block align-middle">在 GitHub 上编辑本页</span></a></h3> <div class="post-contributors-list"><a href="https://github.com/Ovilia" target="_blank" class="post-contributor"><img alt="Ovilia" src="https://avatars.githubusercontent.com/Ovilia?size=60"> <span>Ovilia</span></a></div></div></div></div></div></div> <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/highlight.js@9.12.0/styles/github-gist.min.css"></div></div></div></div><script defer src="/handbook/_nuxt/static/1627882506/en/concepts/visual-map/state.js"></script><script src="/handbook/_nuxt/b6d3b58.js" defer></script><script src="/handbook/_nuxt/js/11b97ca97d591d9fd371.js" defer></script><script src="/handbook/_nuxt/js/5e2cbf163a319fa7cf5b.js" defer></script><script src="/handbook/_nuxt/js/f5e7518d240a121a2e4a.js" defer></script><script src="/handbook/_nuxt/js/4c789e610fc01b03106d.js" defer></script><script src="/handbook/_nuxt/js/25eb9ce4c1818917d228.js" defer></script> |
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