The mock-up that I got looked something like this: My chart had a few basic requirements. Before we can create a dynamic donut chart, we first need to understand how SVG line drawing works. The rotate function takes three arguments: an angle of rotation and x and y coordinates around which the angle rotates. for local development. Better yet, what was the formula to achieve these relative positions using the unique/dynamic segment sizes and the SVG’s stroke attributes? We now have this: As I mentioned earlier, SVG contents are part of the DOM so they are inherently more accessible. Depending on your font and font-size, you may want to adjust the positioning as well. Check out dx and dy for this. In other words, learning might be fun and a worthwhile endeavor. After my research, I was able to understand that using an SVG with a stroke and stroke-dasharray could achieve the donut chart segments I needed. Let’s fix this by creating segments. CSS-Tricks is hosted by Flywheel, the best WordPress hosting in the a decision I'm very happy with. As we do this, we’ll also calculate the coordinates for the text labels. Fortunately, this isn’t the kind of math where we need to apply Real Concepts; this is more the kind where we Google formulas and don’t ask too many questions. Share in the comments! JavaScript). *May or may not contain any actual "CSS" Then, we need to adjust the font-size and line-height. We need to make both text blocks smaller and align them in the center by adjusting the font-size to where we like it (0.6em for the larger-sized number and 0.2em for the label looks about right) and using the “text-anchor” property with a value of “middle.”. We can use a computed property to do this. A developer has access to a variety of ready-made code libraries that will kickstart her web application in much the same way a home cook can utilize pre-made products to make preparing his meal more efficient. All of segments begin at 3 o’clock, which is the default starting point for SVG circles. Flaticon, the largest database of free vector icons. If we didn’t make the second value in the array add up to the 100 total, then we’d get a third dash (or part of one) or more. Why not set one fixed stroke-dasharrary value and then rotate each circle with a transform? Well, adding text is simple. There’s also a with a class of “donut-ring.” This serves as a light grey backdrop when the segments don’t fill 100% of the circumference. CSS and SVG charts are inherently more accessible and more semantic than other techniques. If you know of another, more elegant solution, please let me know! First, let’s add a data property to keep track of the offset: Then our calculation (this is a computed property): Each loop creates a new object with a “degrees” property, pushes that into our chartValues array that we created earlier, and then updates the angleOffset for the next loop. Those articles provide most of the context you’ll need, but briefly, SVG has two presentation attributes: stroke-dasharray and stroke-dashoffset. SVG code for donut chart with 85% filled segment in Figure 2. See the Pen Donut Chart – Segments Only by Salomone Baquis (@soluhmin) on CodePen. Some of these articles even discussed animating the SVGs — which are great, but not exactly what I was looking for either. We’re working in degrees, which means that we need to do some conversions. Giving us our final product: Since the CSS styling in the key with border-radius and Flexbox could each be their own article (the latter requiring a much longer explanation), I’ll leave these topics for another day. It wouldn’t be a donut chart without the text inside the middle — that’s what the hole is for right? What was more elusive was how I could chain several segments — one after the other — around the circle. We can add a color key as part of the for the chart as well, marking it with a role of “presentation” and an aria-hidden attribute since it’s really meant as a visual aid. Excellent article, very well detailed and explained. The segments are created by using the SVG stroke attribute called stroke-dasharray.The value we’ve set in … Sadly, you are correct. I've used WordPress since day one all the way up to v17, Now, we’ll only add labels to segments larger than 5%. If you’re not concerned with that (in the case of a pie chart), then you can remove it. As I alluded to earlier, coding SVGs by hand can be time consuming, especially considering the fact that there are so many great JavaScript libraries out there that would build them for you. After adding in a “translateY” of 0.25em, the text aligns a bit better vertically, but we’re not out of the weeds yet. The tech stack for this site is fairly boring. For example, here’s a stroke-dasharray of “10 10”: Now, in Figure 2 and in Figure 3, you may notice that the stroke-dasharray doesn’t start at the very top (at 12:00). This means that we need to place our elements with x and y coordinates at different points along the circle. There are lots of ways that we can modify or improve this now that it’s built. However, unlike stroke-dasharray, stroke-dashoffset moves counter-clockwise. To calculate the percentage of each data value, we’ll need to pass in values from the v-for loop that we created earlier, which means that we’ll need to add a method. Download over 51 icons of donut chart in SVG, PSD, PNG, EPS format or as webfonts. CSS-Tricks* is created, written by, and maintained by Chris or "Tricks". Not totally elegant, but I was limited to finding either a pure CSS or a JavaScript only solution for my current circumstance. Again, we want to: (a) multiply our data percentage by the circle circumference to get the length of the visible stroke, and (b) subtract this length from the circumference to get the stroke-offset. Mailchimp: Grow sales with Customer Journey Smarts. Let’s start with some helper functions. Frontend Masters has a complete learning course all about data visualization an D3.js from Shirley Wu an incredible and innovative data visualization artist. After all, accessibility isn’t just about catering to screen readers. If you haven’t read Jake Archibald’s excellent Animated Line Drawing in SVG. Now we need to add additional segments around the circle. We can make another computed property to sort these. In the initial mockup, we saw that the segments went from largest to smallest. I also understood that stroke-dashoffset would allow me to “animate” or, in other words, position the segment where I wanted in the circle. Let’s use a segment that’s 15% of the circumference. In addition, we can add the and <desc> content tags (which are native to SVGs) and link these with ARIA labels, IDs, and a role to provide more context to screen readers. Like any self-respecting developer, the first thing I did was Google to see if someone else had already made this. Let’s use 85%: The segments are created by using the SVG stroke attribute called stroke-dasharray. leverage Jetpack for extra functionality and Local JavaScript), SVG-based chart generated client-side (i.e. And we’re done! Because we haven’t added any stroke-dashoffset values yet, each circle’s stroke goes all the way around. There are plenty of articles on the topic, including two by Chris (here and here) and a super recent one by Burke Holland. In addition, our preference was to have this component be as light as possible (avoiding JavaScript if we could) — it didn’t need to be overly fancy or interactive, just a visualization of important data. How to Create Custom HTML Markers on Google Maps, Building a poetry site with Gatsby and a Medium Feed, Debugging Local Mobile Pages on Android Phone Using Chrome Developer Tools, How to create responsive table in modern way, Canvas element-based chart generated client-side (i.e. When evaluating options for pie or donut charts in HTML, you really only have a few: JavaScript chart libraries are often more convenient and loaded with plenty of amazing options like interactivity. While you may certainly use it, you must keep in mind that Chart.js uses the canvas element to draw its charts, and the contents of the canvas element are not part of the DOM. There’s one catch, though: in those formulas, t is in *radians*. With some CSS Flexbox magic, we can position the key off to the right and vertically align it with the chart. This sucks. Like HTML, SVG elements are rendered in the order that they appear in the markup. The radius (“r” attribute) looks absurd! Her techniques could easily be turned into a donut chart as well. Most of these JavaScript libraries have very poor accessibility. It’s about making your content more accessible and more consumable by all people and all devices (including search engines). We’ll then rotate each visible part into the correct position, creating the illusion of a single shape. See the Pen Donut Chart – No Segments by Salomone Baquis (@soluhmin) on CodePen. We first need to total up our data values. So, we’d need to set this value to “25” (for 25% in the opposite direction from 3:00 back to 12:00). A web developer’s kitchen is somewhat similar to a home cook’s. If the stroke-dasharray and the stroke-dashoffset values are the length of the line and equal, the entire line is visible because we’re telling the offset (where the dash-array starts) to begin at the end of the line. If the stroke-dasharray is the length of the line, but the stroke-dashoffset is 0, then the line is invisible because we’re offsetting the rendered part of the dash by its entire length. We could adjust the stroke-dashoffset until we get lucky, but this wouldn’t work easily if we had more than two segments. Digging deep into what I remember from high school math, I know that the radius based on the circumference is: r = C/(2π), or r = 100/(2π). ShopTalk is a podcast all about front-end web design and development. See the Pen Basic Example of SVG Line Drawing, Backward and Forward by Chris Coyier (@chriscoyier) on CodePen. Finally, in order for these sorted values to be available to Vue before the chart gets rendered, we’ll want to reference this computed property from the mounted() lifecycle hook. Math applied to something like this is way more fun than it was in high school. Again, a quick search turns up a formula: We now have enough information to calculate our x and y text coordinates: First, we calculate the angle of our segment by multiplying the ratio of our data value by 360; however, we actually want half of this because our text labels are in the middle of the segment rather than the end. So, I became determined to figure this out for myself. In the end, I convinced myself of three things: My team needed a simple component that could be built server-side and display simple account usage information. I wanted to make my segments sizes logical, digestible and human-readable. Edit, August 25, 2016: Previously, I positioned the text inside the donut using the dominant-baseline property. Here’s the method to get our stroke-offsets: …which we bind to our circle in the HTML with: And voilà! In both cases, the quality of what is pre-made should be considered highly important. Instead, we need a formula: Circumference − All preceding segments’ total length + First segment’s offset = Current segment offset. Don’t get me wrong, convenience isn’t always bad. …and bind the value to our template markup. It’s no surprise that many choose this route. Our calculateTextCoords method can now be used in the calculateChartData computed property: Let’s also add a method to return the label string: See the Pen Donut Chart – Unformatted Labels by Salomone Baquis (@soluhmin) on CodePen. Create our Vue instance and our donut chart component, then tell our donut component to expect some values (our dataset) as props; Establish our basic SVG shapes: <circle> for the segments and <text> for the labels, with the basic dimensions, stroke width, and colors defined; Wrap these shapes in a <g> element, which groups them together We need to add the angle offset like we did when we created the segments. Instead, it actually starts on the right side (at 3:00), and it moves clockwise around the circle. The color that appears is the stroke color of the last circle in the SVG. In order to accomplish this, I decided to base everything off of 100% (or a circumference of 100). We can make this a computed property in our component. A guide for modern browsers. I really like the overlay concept, but found recalculating both stroke-dasharray and stroke-dashoffset values confusing. All of this sounded like a job for SVG. If the information in a chart is highly important (as it was in my situation), should we rely on a client-side script to produce the information? It can take zero, one, or two values. Obviously, this isn’t exactly what we want. It can be beneficial when the trade-offs are known and properly evaluated. If we want to position (or start) at the top, then we need to use stroke-dashoffset. So, why would you bother coding them by hand? We should have something like this: See the Pen Donut Chart – No Rotations by Salomone Baquis (@soluhmin) on CodePen. Awesome tutorial, but I would advise anyone thinking of using pie or donut charts in their UI see “Save the Pies for Dessert – Perceptual Edge” (PDF) by Stephen Few that is quite exhaustive on their short comings. Blech, so off-center. Here’s an example demonstrating these rotations and overlays: See the Pen Circle Overlays by Salomone Baquis (@soluhmin) on CodePen. The viewBox is set to “0 0 42 42”. Yet, sometimes this quality is sacrificed for the sake of convenience. For screen readers, there’s a more descriptive explanation in the <figcaption>. Then, like same said developer, I scrapped the pre-built solution in favor of my own. Now the fun part. The remaining percentage for the stroke-dasharray would be 85 — independent of any other segments. Just a solid-colored donut. However, I couldn’t seem to find any clear explanation on exactly how the stroke dash attributes worked and how they relate to the circumference of the circle. If we don’t supply cx and cy coordinates, then our segments will rotate around the entire SVG coordinate system. This is so we can stack the label and its value on top of each other more easily and position them as one unit. You might suspect that this requires math. GitHub Gist: instantly share code, notes, and snippets. Super cool! We now have a reusable donut chart component that can accept any set of values and create segments. Basic Example of SVG Line Drawing, Backward and Forward, Save the Pies for Dessert – Perceptual Edge, Dynamically calculate its segments based on an arbitrary set of values, Scale well across all screen sizes and devices, Be cross-browser compatible back to Internet Explorer 11, Be reusable across my work’s Vue.js front end, Create our Vue instance and our donut chart component, then tell our donut component to expect some values (our dataset) as props, Calculate the percentage of each data value from the total data values that we pass in, Multiply this percentage by the circumference to get the length of the visible stroke, Subtract this length from the circumference to get the. The first value defines the dash length; the second defines the gap length. Let’s fill the chart with 40%, 30%, and 20% with 10% unused. Let’s add a method to check for this. This means you must take extra measures to ensure your data is even remotely accessible. It needed to: I also wanted something that I could animate later if I needed to. CSS-ninja Lea Verou offers a couple options for creating pie charts from scratch in her article Designing Flexible, Maintainable Pie Charts With CSS and SVG. To rotate these segments in the HTML, we’ll use the transform presentation attribute with the rotate function. The top hit for “SVG donut chart” is this article, which describes how to use stroke-dasharray and stroke-dashoffset to draw multiple overlaid circles and create the illusion of a single segmented circle (more on this shortly). We can fix this with the text-anchor presentation attribute. The good news is that once you figure out a system like this, it can be easily applied elsewhere with little effort. As you can see, this positioning isn’t quite right, so we’ll have to spruce it up with some CSS: First, let’s add the font Montserrat (simply because I love it). I’ve set the X and Y attributes to begin in the center of the SVG at the baseline and left-aligned. This makes it incredibly easy to provide additional context for screen readers through attributes and caption-like elements. Note: If you have discovered any resources that do explain these concepts, please share. Coyier and a team of swell people. stroke-dashoffset, on the other hand, defines where the set of dashes and gaps begins. If I dive into the SVG code and get my hands dirty, I might learn a bit more about the underlying magical gobbledygook. But, there may be instances (like my situation) where you or your team needs a method that doesn’t involve JavaScript — one that’s built server-side. SVG Donut Chart. Edit, January 23, 2017: It’s come to my attention now that Internet Explorer 11 and Microsoft Edge don’t support CSS transforms on SVG elements. We’ll store the sorted version inside the sortedValues array. But, if you’re only using 2D transforms you can use the transform attribute on the <text> elements themselves to position the text. Almost all discussed the use of SVG’s stroke-dasharray and SVG stroke-dashoffset attributes to position the pieces of the chart. Create our Vue instance and our donut chart component, then tell our donut component to expect some values (our dataset) as props; Establish our basic SVG shapes: <circle> for the segments and <text> for the labels, with the basic dimensions, stroke width, and colors defined; Wrap these shapes in a <g> element, which groups them together This is a crazy number with lots of decimals, I know, but it will make all of our lives easier later. And, since we need to do all of these calculations before the chart is rendered, we’ll add our calculateChartData computed property in the mounted hook: Finally, if we want that sweet, sweet gap between each segment, we can subtract two from the circumference and use this as our new stroke-dasharray. SVGs are scalable, so it doesn’t really matter how big they are in the end; at least my math will be simple. Robin Rendle also wrote about making charts using pure CSS, where he points out some downfalls to this approach too. Or, do a sort of bastardized feature detection to target IE11 and Edge like I did, and fudge it from there. Hmm, it seems that if we have small percentages, the labels go outside of the segments. These two values are an array delimited by a space. There’s a <circle> with a class of “donut-hole.” This is what makes sure the center is white. If you have important information to share, please. I created the chart as a Vue component for my project, but you could just as easily do this with vanilla JavaScript, HTML, and CSS. For example: I’d love to hear what you think about this implementation and other experiences you’ve had with SVG charts. I did some Googling on SVGs and SVG donut charts, and I came across the articles by Lea Verou and Robin Rendle (mentioned above) in addition to several others. Here’s a few libraries: With only a few lines of JavaScript and an array of data you can have a chart on your site in seconds. The result is 15.91549430918952. See the Pen Vue Donut Chart – Final Version by Salomone Baquis (@soluhmin) on CodePen. Are you using SVG favicons yet? All that’s left is to make the text uppercase (easy to do) and position the individual text elements using “translateY” so that they stack properly. Chris also has a good overview. We have our segments, but now we need to create labels. Even though I did not use the framework, I was able to adapt to my application without problems. Css-Tricks * is created, written by, and 20 % with %... Could easily be turned into a donut chart – segments only by Salomone (... Is pre-made should be considered highly important target IE11 and Edge like I did was to. A perfect candidate for dynamic visualization of “ donut-hole. ” this is what sure. Made more accessible and more consumable by all people and all devices ( including search engines ) values... Once you figure out a system like this, it seems that if we small! Total 100, this just repeats itself once around create another computed property so that we can or. All about data visualization an D3.js from Shirley Wu an incredible and innovative data visualization an D3.js Shirley! Circle in the SVG ’ s use a segment that ’ s 85! Masters has a whole section on this ) and can be made more accessible and more semantic other. To adapt to my application without problems that our largest donut segment starts from top! Other — around the circle I wanted to make charts with SVG post haven! Is a crazy number with lots of decimals, I was able to adapt to my application problems., because they ’ re powered by data, they can be easily applied elsewhere with little.! Svg, PSD, PNG, EPS format or as webfonts single shape dominant-baseline... ( svg donut chart > with a class of “ donut-hole. ” this is way more fun than it was in school. Really like the overlay concept, but I ’ m using svg donut chart for purposes! See the Pen donut chart component that can accept any set of dashes and used. In SVG, PSD, PNG, EPS format or as webfonts share code, notes, show! Stroke-Dashoffset attributes to begin in the order that they appear in the above is! Know, but not exactly what I was limited to finding either a CSS... You haven svg donut chart t need the overhead of that library SVG has two presentation attributes: stroke-dasharray and stroke-dashoffset:... And cy coordinates, then you can remove it make my segments sizes logical, digestible and human-readable and my. The values total 100, this isn ’ t have accessibility features, consider improving it i.e. Or two values are an array delimited by a space: stroke-dasharray stroke-dashoffset... All devices ( including search engines ) value on top of each svg donut chart easily. Wanted something that I got looked something like this: see the Pen donut chart without the text inside donut... Is way more fun than it was in high school my server at all, isn., formatted string the circle set of dashes and gaps used to paint the outline of a single component! Creating a single shape but not exactly what I was able to adapt to my application without problems basic. S No surprise that many choose this route over 51 icons of donut chart for reporting. Stroke-Dasharray and SVG charts are inherently more accessible and more consumable by all people and all (. With lots of decimals, I know, but not exactly what I was limited to either... Of the circumference more about the underlying magical gobbledygook, convenience isn ’ get. Ensure that our largest donut segment starts from the top, then we need to rotate visible! Our structure share, please I scrapped the pre-built solution in favor of my own cook ’ s stroke?... And possibly more time-consuming to code them by hand 85 %: the segments are created using... Is somewhat similar to a “ stroke ” when creating vectors in programs like Adobe svg donut chart if! From there label and its value on top of each other more easily and position them one. Inside the middle — that ’ s stroke goes all the way up to v17, a decision I very! Some conversions can fix this with the chart as a figure, we saw the... From there known and properly evaluated frontend Masters has a complete learning course all about data visualization.... Other words, learning might be fun and a team of swell people issue in how! Rotate each circle with a class of “ donut-hole. ” this is what makes sure the center is white sorted. To segments larger than 5 % for the sake of convenience m using x-template for demo purposes but! % with 10 % unused site is fairly boring second defines the gap length supply cx and cy,! S use svg donut chart segment that ’ s stroke goes all the way up to,! Because we haven ’ t need the overhead of that library I asked myself same. Can be made more accessible through additional input pre-built solution in favor of my own if you have important to! This isn ’ t work easily if we had more than two segments code by... Downfalls to this approach too a bit more about the underlying magical gobbledygook that the segments are created using... Stroke-Offset values, which means that we can fix this with the rotate function add a method get. Get my hands dirty, I positioned the text labels order to accomplish,... Re working in degrees, which will establish our circle segments the chart with 40 %, and fudge from..., there ’ s fill the chart with 40 %, and far simpler cross-browser using. Svg circles had already made this be turned into a donut chart in SVG PSD. Kitchen is somewhat similar to a home cook ’ s excellent Animated Line,..., PSD, PNG, EPS format or as webfonts the tech stack this. Or, do a sort of bastardized feature detection to target IE11 and Edge like did... Return a nice, formatted string ( the W3C has a complete course. Should be considered highly important ’ m using x-template for demo purposes but... Our data values and get my hands dirty, I became determined to figure this out myself... Tech stack for this site is fairly boring that can accept any set of and... And vertically align it with the text-anchor presentation attribute of segments begin at 3 o clock. Of SVG Line Drawing works they ’ re using a circle and the SVG ’ s a! Javascript chart library doesn ’ t added any stroke-dashoffset values confusing was more elusive was how I chain. On your font and font-size, you may want to adjust the size of the last circle in the,. To a “ stroke ” when creating vectors in programs like Adobe Illustrator the entire SVG coordinate system convenience ’! Along the circle with SVG post degrees, which is the default starting point for SVG figure... Of any other segments semantic than other techniques radians * x-template for demo purposes, but I d! Something like this: see the Pen donut chart – No Rotations by Salomone Baquis ( soluhmin. Experiment, debug, and JavaScript svg donut chart what we want the set of values and create segments do conversions! To paint the outline of a pie chart ), and show off your HTML,,! Then, we ’ ll store the sorted Version inside the donut chart component that can any. Pen donut chart relative positions using the SVG visualization an D3.js from Shirley an... Adobe Illustrator the method to check for this mock-up that I could animate later if dive... S not a negative number, because offset moves counter-clockwise function takes three arguments: an angle of rotation x! Though: svg donut chart those formulas, t is in * radians * — which great! Site is fairly boring these properties are identical to a “ stroke ” when creating vectors in programs Adobe... Begin at 3 o ’ clock, which means that we can use a computed property in component. Component for production have edited svg donut chart post to reflect a better, and I asked myself the same fixed..., this isn ’ t need the overhead of that library charts with SVG post next we need to the. Animating the SVGs — which are great, but it will make all of this like... Native to SVGs position them as one unit to see if someone else had already made.! ( “ r ” attribute ) looks absurd purposes, but I was limited to finding a. “ stroke ” when creating vectors in programs like Adobe Illustrator and then rotate each circle ’ s not negative. > with a class of “ donut-hole. ” this is so we fix. In SVG SVG at the baseline and left-aligned to position ( or start ) at the top Example! One catch, though: in those formulas, t is in * radians * of donut-hole.... This sounded like a job for SVG a system like this is what makes sure the center of context... “ stroke ” when creating vectors in programs like Adobe Illustrator by data, they can be beneficial the! Out a system like this, it can be svg donut chart and possibly more to... Using the dominant-baseline property, creating the illusion of a pie chart,. % of the segments are created by using the SVG stroke attribute called stroke-dasharray.The value we ll. An D3.js from Shirley Wu an incredible and innovative data visualization an D3.js from Shirley an! Transform presentation attribute part of the context you ’ re a perfect candidate for dynamic.... A perfect candidate for dynamic visualization soluhmin ) on CodePen ve set the! Not set one fixed stroke-dasharrary value and then rotate each circle with a class of donut-hole.! Is sacrificed for the sake of convenience his how to make charts with SVG post most the... Get our stroke-offsets: …which we bind to our desired percentage 25, 2016: Previously, scrapped.
<div id="copy">
<div id="wrap" style="text-align:center;">
<h2>
svg donut chart
</h2>
<a href="http://www.fogosxingu.com.br/topic/b7eb70-how-to-install-underlayment-for-vinyl-plank-flooring">How To Install Underlayment For Vinyl Plank Flooring</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-post-structuralism-architecture">Post Structuralism Architecture</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-riviera-beach-weather-radar">Riviera Beach Weather Radar</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-retailers-in-fiji">Retailers In Fiji</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-chicago-housing-authority-coronavirus">Chicago Housing Authority Coronavirus</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-vsepr-chart-hybridization">Vsepr Chart Hybridization</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-applied-behavior-analysis-conferences-2021">Applied Behavior Analysis Conferences 2021</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-healthy-scrambled-eggs-for-weight-loss">Healthy Scrambled Eggs For Weight Loss</a>,
<a href="http://www.fogosxingu.com.br/topic/b7eb70-magnolia-green-rentals">Magnolia Green Rentals</a>,
<div class="copyright">svg donut chart 2020
</div></div>
</div>
</body>
</html>