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authorBradley Taunt <bt@btxx.org>2024-06-10 09:41:25 -0400
committerBradley Taunt <bt@btxx.org>2024-06-10 09:41:25 -0400
commit07e4a2dafe248280b5610f8c7d09b0f30b530f54 (patch)
tree8a145d1d4d07e1278a837ff15dadccc322d27515 /build/css-slope-graphs
parent16d28628aca9b2d356de31c319f5e7bc0f5b2b02 (diff)
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- <meta name="viewport" content="width=device-width, initial-scale=1">
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- <title>CSS Slope Graphs</title>
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- <a href="#menu">Menu &darr;</a>
-</nav>
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-<main>
-<h1 id="css-slope-graphs">CSS Slope Graphs</h1>
-<p>2021-06-07</p>
-<p><em>I am a huge sucker for simplistic and beautifully designed visual data on the web</em>. Most data tends to be graphed via line or bar systems - which is fine - but I think slope graphs are highly underrated. Let&#8217;s change that, shall we?</p>
-<h2 id="the-demo">The Demo</h2>
-<p>I&#8217;m basing this demo off the design patterns found in <a href="https://www.edwardtufte.com/tufte/books_vdqi">Edward Tufte&#8217;s visualization work</a>, specifically his slope graph designs:</p>
-<p><a href="https://codepen.io/bradleytaunt/pen/jOBzXMe">Live CodePen Example</a></p>
-<h2 id="the-html">The HTML</h2>
-<p>For this concept we will actually be building this graph out of <code>tables</code> - crazy, right? The greatest benefit of rendering all the data inside of a <code>table</code> element is the ability to easily support smaller screens and mobile devices. Larger viewports will get to see the pretty slope graph, while those below a certain threshold will view a simple table.</p>
-<p>(But more on that in the CSS section)</p>
-<pre><code>&#60;p&#62;Sales of the leading frozen pizza brands of the United States from 2011 to 2017 (in million US dollars) &#60;br&#62;&#60;em&#62;Source: Statisa 2018&#60;&#47;em&#62;&#60;&#47;p&#62;
-&#60;table&#62;
- &#60;thead&#62;
- &#60;tr&#62;
- &#60;th&#62;Pizza Brand&#60;&#47;th&#62;
- &#60;th&#62;2011&#60;&#47;th&#62;
- &#60;th&#62;2017&#60;&#47;th&#62;
- &#60;&#47;tr&#62;
- &#60;&#47;thead&#62;
- &#60;tbody&#62;
- &#60;tr&#62;
- &#60;td data-set="677.0"&#62;DiGiorno&#60;&#47;td&#62;
- &#60;td&#62;&#60;span&#62;677.0&#60;&#47;span&#62;&#60;&#47;td&#62;
- &#60;td data-name="DiGiorno"&#62;1014.6&#60;&#47;td&#62;
- &#60;&#47;tr&#62;
- &#60;tr&#62;
- &#60;td data-set="294.8"&#62;Private Label&#60;&#47;td&#62;
- &#60;td&#62;&#60;span&#62;294.8&#60;&#47;span&#62;&#60;&#47;td&#62;
- &#60;td data-name="Private Label"&#62;524.8&#60;&#47;td&#62;
- &#60;&#47;tr&#62;
- &#60;tr&#62;
- &#60;td data-set="286.1"&#62;Red Baron&#60;&#47;td&#62;
- &#60;td&#62;&#60;span&#62;286.1&#60;&#47;span&#62;&#60;&#47;td&#62;
- &#60;td data-name="Red Baron"&#62;572.3&#60;&#47;td&#62;
- &#60;&#47;tr&#62;
- &#60;tr&#62;
- &#60;td data-set="257.9"&#62;Tombstone&#60;&#47;td&#62;
- &#60;td&#62;&#60;span&#62;257.9&#60;&#47;span&#62;&#60;&#47;td&#62;
- &#60;td data-name="Tombstone"&#62;270.6&#60;&#47;td&#62;
- &#60;&#47;tr&#62;
- &#60;tr&#62;
- &#60;td data-set="164.5"&#62;Totino&#39;s Party Pizza&#60;&#47;td&#62;
- &#60;td&#62;&#60;span&#62;164.5&#60;&#47;span&#62;&#60;&#47;td&#62;
- &#60;td data-name="Totino&#39;s Party Pizza"&#62;347.2&#60;&#47;td&#62;
- &#60;&#47;tr&#62;
- &#60;&#47;tbody&#62;
-&#60;&#47;table&#62;
-</code></pre>
-<p>As you can see, nothing too fancy is happpening here. Pay close attention to the <code>data-set</code> and <code>data-name</code> variables though - those will be important for the CSS portion of this design, mainly the rendering of the line elements.</p>
-<h2 id="the-css">The CSS</h2>
-<p>To avoid overwhelming your brain all-at-once, let&#8217;s break the CSS down into bite-sized chunks, starting with the base styling:</p>
-<pre><code>@import url(&#39;https:&#47;&#47;opentype.netlify.com&#47;et-book&#47;index.css&#39;);
-* {
- box-sizing: border-box;
-}
-
-html {
- height: 100%;
-}
-
-body {
- background: #fffff8;
- font-family: "et-book", serif;
- height: 100%;
- margin: 0 auto;
- max-width: 800px;
- padding: 0 0.5rem;
-}
-
-p {
- font-size: 18px;
- margin: 4rem 0 6rem;
-}
-
-table {
- border-collapse: collapse;
- text-align: left;
- width: 100%;
-}
-</code></pre>
-<p>Pretty basic stuff.</p>
-<p>Now we need to design how our slope graph will look on larger screens &#47; desktops. For this instance, we will target these larger devices with a <code>min-width</code> media query of <code>800px</code>. The rest of the CSS might look a little confusing but I assure you it is quite simple.</p>
-<ol>
-<li><p>On larger devices we hide the first <code>thead tr th</code> element with <code>display: none</code></p></li>
-<li><p>The first and second <code>td</code> elements inside each <code>tbody</code> row need to be set as <code>position: absolute</code> to avoid duplicate content</p></li>
-<li><p>The inner <code>span</code> that we include in our HTML inside the second <code>tbody tr td</code> also needs to be <code>display: none</code></p></li>
-<li><p>Remember that <code>data-set</code> variable? We now use that for our <code>:before</code> pseudo element for <code>table tbody tr td:nth-of-type(1)</code></p></li>
-<li><p>Remember that <code>data-name</code> variable? We now use that for our <code>:before</code> pseudo element for <code>table tbody tr td:nth-of-type(3)</code></p></li>
-<li><p>After that, you can see the simple customization we include to render the angle &#47; position of the slope lines and the corresponding labels</p>
-<p>@media(min-width:800px) {
- table {
- display: block;
- position: relative;
- margin-bottom: 25rem;
- }</p>
-<pre><code>table thead th {
- border-bottom: 1px solid lightgrey;
- font-size: 24px;
- position: absolute;
- top: -50px;
- width: 45%;
-}
-table thead th:nth-child(1){ display: none; }
-table thead th:nth-child(2){ left: 0; }
-table thead th:nth-child(3){ right: 0; text-align: right; }
-
-table tbody tr td:nth-of-type(1),
-table tbody tr td:nth-of-type(2) { position: absolute;}
-
-table tbody tr td:nth-of-type(2) span { display: none; }
-table tbody tr td:nth-of-type(1):before {
- content: attr(data-set);
- margin-right: 10px;
- position: relative;
-}
-
-table tbody tr td:nth-of-type(2) { padding-left: 10px; }
-
-table tbody tr td:nth-of-type(3) {
- position: absolute;
- right: 0;
-}
-table tbody tr td:nth-of-type(3):before {
- content: attr(data-name);
- margin-right: 10px;
- position: relative;
-}
-
-&#47;* Custom individual slopes -- Left *&#47;
-tbody tr:nth-child(1) td:nth-child(1),
-tbody tr:nth-child(1) td:nth-child(2) { top: 60px; }
-tbody tr:nth-child(2) td:nth-child(1),
-tbody tr:nth-child(2) td:nth-child(2) { top: 140px; }
-tbody tr:nth-child(3) td:nth-child(1),
-tbody tr:nth-child(3) td:nth-child(2) { top: 165px; }
-tbody tr:nth-child(4) td:nth-child(1),
-tbody tr:nth-child(4) td:nth-child(2) { top: 220px; }
-tbody tr:nth-child(5) td:nth-child(1),
-tbody tr:nth-child(5) td:nth-child(2) { top: 270px; }
-
-&#47;* Custom individual slopes -- Right *&#47;
-[data-name="DiGiorno"] { top: 0; }
-[data-name="Red Baron"] { top: 65px; }
-[data-name="Private Label"] { top: 100px; }
-[data-name="Tombstone"] { top: 180px; }
-[data-name="Totino&#39;s Party Pizza"] { top: 150px; }
-
-&#47;* The custom visual lines *&#47;
-tbody tr:after {
- background: black;
- content: &#39;&#39;;
- height: 1px;
- left: 14.5%;
- position: absolute;
- width: 70%;
-}
-tbody tr:nth-child(1):after {
- top: 40px;
- transform: rotate(-6deg);
-}
-tbody tr:nth-child(2):after {
- left: 17.5%;
- top: 130px;
- transform: rotate(-4deg);
- width: 65%;
-}
-tbody tr:nth-child(3):after {
- left: 15%;
- top: 125px;
- transform: rotate(-10.25deg);
- width: 70%;
-}
-tbody tr:nth-child(4):after {
- left: 16%;
- top: 210px;
- transform: rotate(-4deg);
- width: 68%;
-}
-tbody tr:nth-child(5):after {
- left: 22%;
- top: 222px;
- transform: rotate(-16deg);
- width: 56%;
-}
-</code></pre>
-<p>}</p></li>
-</ol>
-<p>All that&#8217;s left are some minor styles to make everything look nice on mobile:</p>
-<pre><code>@media(max-width:800px) {
- p {
- margin: 2rem 0;
- }
- table td, table th {
- border-bottom: 1px solid grey;
- padding: 10px;
- }
- table td:last-of-type, table th:last-of-type {
- text-align: right;
- }
-}
-</code></pre>
-<h2 id="not-the-most-practical">Not the most practical</h2>
-<p>This slope graph concept is far from perfect for use in real-world situations. The fact that you need to manually render each point of data yourself makes this implementation quite annoying for more in-depth projects.</p>
-<p>But it was fun to mess around with and create, so who cares!</p>
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