| 61 |
Animation in Responsive Design |
Animation and responsive design can sometimes feel like they’re at odds with each other. Animation often needs space to do its thing, but RWD tells us that the amount of space we’ll have available is going to change a lot. Balancing that can lead to some tricky animation situations.
Embracing the squishiness of responsive design doesn’t have to mean giving up on your creative animation ideas. There are three general techniques that can help you balance your web animation creativity with your responsive design needs. One or all of these approaches might help you sneak in something just a little extra into your next project.
Focused art direction
Smaller viewports mean a smaller stage for your motion to play out on, and this tends to amplify any motion in your animation. Suddenly 100 pixels is really far and multiple moving parts can start looking like they’re battling for space. An effect that looked great on big viewports can become muddled and confusing when it’s reframed in a smaller space.
Making animated movements smaller will do the trick for simple motion like a basic move across the screen. But for more complex animation on smaller viewports, you’ll need to simplify and reduce the number of moving parts. The key to this is determining what the vital parts of the animation are, to zone in on the parts that are most important to its message. Then remove the less necessary bits to distill the motion’s message down to the essentials.
For example, Rally Interactive’s navigation folds down into place with two triangle shapes unfolding each corner on larger viewports. If this exact motion was just scaled down for narrower spaces the two corners would overlap as they unfolded. It would look unnatural and wouldn’t make much sense.
Open video
The main purpose of this animation is to show an unfolding action. To simplify the animation, Rally unfolds only one side for narrower viewports, with a slightly different animation. The action is still easily interpreted as unfolding and it’s done in a way that is a better fit for the available space. The message the motion was meant to convey has been preserved while the amount of motion was simplified.
Open video
Si Digital does something similar. The main concept of the design is to portray the studio as a creative lab. On large viewports, this is accomplished primarily through an animated illustration that runs the full length of the site and triggers its animations based on your scroll position. The illustration is there to support the laboratory concept visually, but it doesn’t contain critical content.
Open video
At first, it looks like Si Digital just turned off the animation of the illustration for smaller viewports. But they’ve actually been a little cleverer than that. They’ve also reduced the complexity of the illustration itself. Both the amount of motion (reduced down to no motion) and the illustration were simplified to create a result that is much easier to glean the concept from.
Open video
The most interesting thing about these two examples is that they’re solved more with thoughtful art direction than complex code. Keeping the main concept of the animations at the forefront allowed each to adapt creative design solutions to viewports of varying size without losing the integrity of their design.
Responsive choreography
Static content gets moved around all the time in responsive design. A three-column layout might line up from left to right on wide viewports, then stack top to bottom on narrower viewports. The same approach can be used to arrange animated content for narrower views, but the animation’s choreography also needs to be adjusted for the new layout. Even with static content, just scaling it down or zooming out to fit it into the available space is rarely an ideal solution. Rearranging your animations’ choreography to change which animation starts when, or even which animations play at all, keeps your animated content readable on smaller viewports.
In a recent project I had three small animations that played one after the other, left to right, on wider viewports but needed to be stacked on narrower viewports to be large enough to see. On wide viewports, all three animations could play one right after the other in sequence because all three were in the viewable area at the same time. But once these were stacked for the narrower viewport layouts, that sequence had to change.
Open video
What was essentially one animation on wider viewports became three separate animations when stacked on narrower viewports. The layout change meant the choreography had to change as well. Each animation starts independently when it comes into view in the stacked layout instead of playing automatically in sequence. (I’ve put the animated parts in this demo if you want to peek under the hood.)
Open video
I choose to use the GreenSock library, with the choreography defined in two different timelines for this particular project. But the same goals could be accomplished with other JavaScript options or even CSS keyframe animations and media queries.
Even more complex responsive choreography can be pulled off with SVG. Media queries can be used to change CSS animations applied to SVG elements at specific breakpoints for starters. For even more responsive power, SVG’s viewBox property, and the positioning of the objects within it, can be adjusted at JavaScript-defined breakpoints. This lets you set rules to crop the viewable area and arrange your animating elements to fit any space.
Sarah Drasner has some great examples of how to use this technique with style in this responsive infographic and this responsive interactive illustration. On the other hand, if smart scalability is what you’re after, it’s also possible to make all of an SVG’s shapes and motion scale with the SVG canvas itself. Sarah covers both these clever responsive SVG techniques in detail. Creative and complex animation can easily become responsive thanks to the power of SVG!
Open video
Bake performance into your design decisions
It’s hard to get very far into a responsive design discussion before performance comes up. Performance goes hand in hand with responsive design and your animation decisions can have a big impact on the overall performance of your site.
The translate3D “hack”, backface-visibility:hidden, and the will-change property are the heavy hitters of animation performance. But decisions made earlier in your animation design process can have a big impact on rendering performance and your performance budget too.
Pick a technology that matches your needs
One of the biggest advantages of the current web animation landscape is the range of tools we have available to us. We can use CSS animations and transitions to add just a dash of interface animation to our work, go all out with webGL to create a 3D experience, or anywhere in between. All within our browsers! Having this huge range of options is amazing and wonderful but it also means you need to be cognizant of what you’re using to get the job done.
Loading in the full weight of a robust JavaScript animation library is going to be overkill if you’re only animating a few small elements here and there. That extra overhead will have an impact on performance. Performance budgets will not be pleased.
Always match the complexity of the technology you choose to the complexity of your animation needs to avoid unnecessary performance strain. For small amounts of animation, stick to CSS solutions since it’s the most lightweight option. As your animations grow in complexity, or start to require more robust logic, move to a JavaScript solution that can accomplish what you need.
Animate the most performant properties
Whether you’re animating in CSS or JavaScript, you’re affecting specific properties of the animated element. Browsers can animate some properties more efficiently than others based on how many steps need to happen behind the scenes to visually update those properties.
Browsers are particularly efficient at animating opacity, scale, rotation, and position (when the latter three are done with transforms). This article from Paul Irish and Paul Lewis gives the full scoop on why. Conveniently, those are also the most common properties used in motion design. There aren’t many animated effects that can’t be pulled off with this list. Stick to these properties to set your animations up for the best performance results from the start. If you find yourself needing to animate a property outside of this list, check CSS Triggers… to find out how much of an additional impact it might have.
Offset animation start times
Offsets (the concept of having a series of similar movements execute one slightly after the other, creating a wave-like pattern) are a long-held motion graphics trick for creating more interesting and organic looking motion. Employing this trick of the trade can also be smart for performance. Animating a large number of objects all at the same time can put a strain on the browser’s rendering abilities even in the best cases. Adding short delays to offset these animations in time, so they don’t all start at once, can improve rendering performance.
Go explore the responsive animation possibilities for yourself!
With smart art direction, responsive choreography, and an eye on performance you can create just about any creative web animation you can think up while still being responsive. Keep these in mind for your next project and you’ll pull off your animations with style at any viewport size! |
2015 |
Val Head |
valhead |
2015-12-09T00:00:00+00:00 |
https://24ways.org/2015/animation-in-responsive-design/ |
design |
| 65 |
The Accessibility Mindset |
Accessibility is often characterized as additional work, hard to learn and only affecting a small number of people. Those myths have no logical foundation and often stem from outdated information or misconceptions.
Indeed, it is an additional skill set to acquire, quite like learning new JavaScript frameworks, CSS layout techniques or new HTML elements. But it isn’t particularly harder to learn than those other skills.
A World Health Organization (WHO) report on disabilities states that,
[i]ncluding children, over a billion people (or about 15% of the world’s population) were estimated to be living with disability.
Being disabled is not as unusual as one might think. Due to chronic health conditions and older people having a higher risk of disability, we are also currently paving the cowpath to an internet that we can still use in the future.
Accessibility has a very close relationship with usability, and advancements in accessibility often yield improvements in the usability of a website. Websites are also more adaptable to users’ needs when they are built in an accessible fashion.
Beyond the bare minimum
In the time of table layouts, web developers could create code that passed validation rules but didn’t adhere to the underlying semantic HTML model. We later developed best practices, like using lists for navigation, and with HTML5 we started to wrap those lists in nav elements. Working with accessibility standards is similar. The Web Content Accessibility Guidelines (WCAG) 2.0 can inform your decision to make websites accessible and can be used to test that you met the success criteria. What it can’t do is measure how well you met them.
W3C developed a long list of techniques that can be used to make your website accessible, but you might find yourself in a situation where you need to adapt those techniques to be the most usable solution for your particular problem.
The checkbox below is implemented in an accessible way: The input element has an id and the label associated with the checkbox refers to the input using the for attribute. The hover area is shown with a yellow background and a black dotted border:
Open video
The label is clickable and the checkbox has an accessible description. Job done, right? Not really. Take a look at the space between the label and the checkbox:
Open video
The gutter is created using a right margin which pushes the label to the right. Users would certainly expect this space to be clickable as well. The simple solution is to wrap the label around the checkbox and the text:
Open video
You can also set the label to display:block; to further increase the clickable area:
Open video
And while we’re at it, users might expect the whole box to be clickable anyway. Let’s apply the CSS that was on a wrapping div element to the label directly:
Open video
The result enhances the usability of your form element tremendously for people with lower dexterity, using a voice mouse, or using touch interfaces. And we only used basic HTML and CSS techniques; no JavaScript was added and not one extra line of CSS.
<form action="#">
<label for="uniquecheckboxid">
<input type="checkbox" name="checkbox" id="uniquecheckboxid" />
Checkbox 4
</label>
</form>
Button Example
The button below looks like a typical edit button: a pencil icon on a real button element. But if you are using a screen reader or a braille keyboard, the button is just read as “button” without any indication of what this button is for.
Open video
A screen reader announcing a button. Contains audio.
The code snippet shows why the button is not properly announced:
<button>
<span class="icon icon-pencil"></span>
</button>
An icon font is used to display the icon and no text alternative is given. A possible solution to this problem is to use the title or aria-label attributes, which solves the alternative text use case for screen reader users:
Open video
A screen reader announcing a button with a title.
However, screen readers are not the only way people with and without disabilities interact with websites. For example, users can reset or change font families and sizes at will. This helps many users make websites easier to read, including people with dyslexia. Your icon font might be replaced by a font that doesn’t include the glyphs that are icons. Additionally, the icon font may not load for users on slow connections, like on mobile phones inside trains, or because users decided to block external fonts altogether. The following screenshots show the mobile GitHub view with and without external fonts:
The mobile GitHub view with and without external fonts.
Even if the title/aria-label approach was used, the lack of visual labels is a barrier for most people under those circumstances. One way to tackle this is using the old-fashioned img element with an appropriate alt attribute, but surprisingly not every browser displays the alternative text visually when the image doesn’t load.
<button>
<img src="icon-pencil.svg" alt="Edit">
</button>
Providing always visible text is an alternative that can work well if you have the space. It also helps users understand the meaning of the icons.
<button>
<span class="icon icon-pencil"></span> Edit
</button>
This also reads just fine in screen readers:
Open video
A screen reader announcing the revised button.
Clever usability enhancements don’t stop at a technical implementation level. Take the BBC iPlayer pages as an example: when a user navigates the “captioned videos” or “audio description” categories and clicks on one of the videos, captions or audio descriptions are automatically switched on. Small things like this enhance the usability and don’t need a lot of engineering resources. It is more about connecting the usability dots for people with disabilities. Read more about the BBC iPlayer accessibility case study.
More information
W3C has created several documents that make it easier to get the gist of what web accessibility is and how it can benefit everyone. You can find out “How People with Disabilities Use the Web”, there are “Tips for Getting Started” for developers, designers and content writers. And for the more seasoned developer there is a set of tutorials on web accessibility, including information on crafting accessible forms and how to use images in an accessible way.
Conclusion
You can only produce a web project with long-lasting accessibility if accessibility is not an afterthought. Your organization, your division, your team need to think about accessibility as something that is the foundation of your website or project. It needs to be at the same level as performance, code quality and design, and it needs the same attention. Users often don’t notice when those fundamental aspects of good website design and development are done right. But they’ll always know when they are implemented poorly.
If you take all this into consideration, you can create accessibility solutions based on the available data and bring accessibility to people who didn’t know they’d need it:
Open video
In this video from the latest Apple keynote, the Apple TV is operated by voice input through a remote. When the user asks “What did she say?” the video jumps back fifteen seconds and captions are switched on for a brief time. All three, the remote, voice input and captions have their roots in assisting people with disabilities. Now they benefit everyone. |
2015 |
Eric Eggert |
ericeggert |
2015-12-17T00:00:00+00:00 |
https://24ways.org/2015/the-accessibility-mindset/ |
code |
| 70 |
Bringing Your Code to the Streets |
— or How to Be a Street VJ
Our amazing world of web code is escaping out of the browser at an alarming rate and appearing in every aspect of the environment around us. Over the past few years we’ve already seen JavaScript used server-side, hardware coded with JavaScript, a rise of native style and desktop apps created with HTML, CSS and JavaScript, and even virtual reality (VR) is getting its fair share of front-end goodness.
You can go ahead and play with JavaScript-powered hardware such as the Tessel or the Espruino to name a couple. Just check out the Tessel project page to see JavaScript in the world of coffee roasting or sleep tracking your pet. With the rise of the internet of things, JavaScript can be seen collecting information on flooding among other things. And if that’s not enough ‘outside the browser’ implementations, Node.js servers can even be found in aircraft!
I previously mentioned VR and with three.js’s extra StereoEffect.js module it’s relatively simple to get browser 3D goodness to be Google Cardboard-ready, and thus set the stage for all things JavaScript and VR. It’s been pretty popular in the art world too, with interactive works such as Seb Lee-Delisle’s Lunar Trails installation, featuring the old arcade game Lunar Lander, which you can now play in your browser while others watch (it is the web after all). The Science Museum in London held Chrome Web Lab, an interactive exhibition featuring five experiments, showcasing the magic of the web. And it’s not even the connectivity of the web that’s being showcased; we can even take things offline and use web code for amazing things, such as fighting Ebola.
One thing is for sure, JavaScript is awesome. Hell, if you believe those telly programs (as we all do), JavaScript can even take down the stock market, purely through the witchcraft of canvas! Go JavaScript!
Now it’s our turn
So I wanted to create a little project influenced by this theme, and as it’s Christmas, take it to the streets for a little bit of party fun! Something that could take code anywhere. Here’s how I made a portable visual projection pack, a piece of video mixing software and created some web-coded street art.
Step one: The equipment
You will need:
One laptop: with HDMI output and a modern browser installed, such as Google Chrome.
One battery-powered mini projector: I’ve used a Texas Instruments DLP; for its 120 lumens it was the best cost-to-lumens ratio I could find.
One MIDI controller (optional): mine is an ICON iDJ as it suits mixing visuals. However, there is more affordable hardware on the market such as an Akai LPD8 or a Korg nanoPAD2. As you’ll see in the article, this is optional as it can be emulated within the software.
A case to carry it all around in.
Step two: The software
The projected visuals, I imagined, could be anything you can create within a browser, whether that be simple HTML and CSS, images, videos, SVG or canvas. The only requirement I have is that they move or change with sound and that I can mix any one visual into another.
You may remember a couple of years ago I created a demo on this very site, allowing audio-triggered visuals from the ambient sounds your device mic was picking up. That was a great starting point – I used that exact method to pick up the audio and thus the first requirement was complete. If you want to see some more examples of visuals I’ve put together for this, there’s a showcase on CodePen.
The second requirement took a little more thought. I needed two screens, which could at any point show any of the visuals I had coded, but could be mixed from one into the other and back again. So let’s start with two divs, both absolutely positioned so they’re on top of each other, but at the start the second screen’s opacity is set to zero.
Now all we need is a slider, which when moved from one side to the other slowly sets the second screen’s opacity to 1, thereby fading it in.
See the Pen Mixing Screens (Software Version) by Rumyra (@Rumyra) on CodePen.
Mixing Screens (CodePen)
As you saw above, I have a MIDI controller and although the software method works great, I’d quite like to make use of this nifty piece of kit. That’s easily done with the Web MIDI API. All I need to do is call it, and when I move one of the sliders on the controller (I’ve allocated the big cross fader in the middle for this), pick up on the change of value and use that to control the opacity instead.
var midi, data;
// start talking to MIDI controller
if (navigator.requestMIDIAccess) {
navigator.requestMIDIAccess({
sysex: false
}).then(onMIDISuccess, onMIDIFailure);
} else {
alert(“No MIDI support in your browser.”);
}
// on success
function onMIDISuccess(midiData) {
// this is all our MIDI data
midi = midiData;
var allInputs = midi.allInputs.values();
// loop over all available inputs and listen for any MIDI input
for (var input = allInputs.next(); input && !input.done; input = allInputs.next()) {
// when a MIDI value is received call the onMIDIMessage function
input.value.onmidimessage = onMIDIMessage;
}
}
function onMIDIMessage(message) {
// data comes in the form [command/channel, note, velocity]
data = message.data;
// Opacity change for screen. The cross fader values are [176, 8, {0-127}]
if ( (data[0] === 176) && (data[1] === 8) ) {
// this value will change as the fader is moved
var opacity = data[2]/127;
screenTwo.style.opacity = opacity;
}
}
The final code was slightly more complicated than this, as I decided to switch the two screens based on the frequencies of the sound that was playing, and use the cross fader to depict the frequency threshold value. This meant they flickered in and out of each other, rather than just faded. There’s a very rough-and-ready first version of the software on GitHub.
Phew, Great! Now we need to get all this to the streets!
Step three: Portable kit
Did you notice how I mentioned a case to carry it all around in? I wanted the case to be morphable, so I could use the equipment from it too, a sort of bag-to-usherette-tray-type affair. Well, I had an unused laptop bag…
I strengthened it with some MDF, so when I opened the bag it would hold like a tray where the laptop and MIDI controller would sit. The projector was Velcroed to the external pocket of the bag, so when it was a tray it would project from underneath. I added two durable straps, one for my shoulders and one round my waist, both attached to the bag itself. There was a lot of cutting and trimming. As it was a laptop bag it was pretty thick to start and sewing was tricky. However, I only broke one sewing machine needle; I’ve been known to break more working with leather, so I figured I was doing well. By the way, you can actually buy usherette trays, but I just couldn’t resist hacking my own :)
Step four: Take to the streets
First, make sure everything is charged – everything – a lot! The laptop has to power both the MIDI controller and the projector, and although I have a mobile phone battery booster pack, that’ll only charge the projector should it run out. I estimated I could get a good hour of visual artistry before I needed to worry, though.
I had a couple of ideas about time of day and location. Here in the UK at this time of year, it gets dark around half past four, so I could easily head out in a city around 5pm and it would be dark enough for the projections to be seen pretty well. I chose Bristol, around the waterfront, as there were some interesting locations to try it out in. The best was Millennium Square: busy but not crowded and plenty of surfaces to try projecting on to.
My first time out with the portable audio/visual pack (PAVP as it will now be named) was brilliant. I played music and projected visuals, like a one-woman band of A/V!
You might be thinking what the point of this was, besides, of course, it being a bit of fun. Well, this project got me to look at canvas and SVG more closely. The Web MIDI API was really interesting; MIDI as a data format has some great practical uses. I think without our side projects we may not have all these wonderful uses for our everyday code. Not only do they remind us coding can, and should, be fun, they also help us learn and grow as makers.
My favourite part? When I was projecting into a water feature in Millennium Square. For those who are familiar, you’ll know it’s like a wall of water so it produced a superb effect. I drew quite a crowd and a kid came to stand next to me and all I could hear him say with enthusiasm was, ‘Oh wow! That’s so cool!’
Yes… yes, kid, it was cool. Making things with code is cool.
Massive thanks to the lovely Drew McLellan for his incredibly well-directed photography, and also Simon Johnson who took a great hand in perfecting the kit while it was attached. |
2015 |
Ruth John |
ruthjohn |
2015-12-06T00:00:00+00:00 |
https://24ways.org/2015/bringing-your-code-to-the-streets/ |
code |