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View Code? Open in Web Editor NEWEasings (cubic-bezier timing functions) as custom properties and SCSS variables.
License: Do What The F*ck You Want To Public License
Easings (cubic-bezier timing functions) as custom properties and SCSS variables.
License: Do What The F*ck You Want To Public License
It could be less cumbersome to write the CSS transition-timing-function
and animation-timing-function
rules. A mixin could be handy, but it has to be straightforward and intuitive.
So, in order to generate one of these lines of CSS:
.my-class {
transition-timing-function: cubic-bezier(0.455, 0.03, 0.515, 0.955); /* = in-out-quad */
transition-timing-function: var(--in-out-quad);
}
This SCSS could be written:
.my-class {
// using current easings.scss version
transition-timing-function: $in-out-quad;
transition-timing-function: bezier(.455, .03, .515, .955);
// straightforward,but is it for animation-timing-function or transtition-timing-function?
@include timing('in-out-quad');
@include timing(.455, .03, .515, .955);
// a bit longer, but still shorter and more explicit than previous proposal
@include transition-timing('in-out-quad');
@include transition-timing(.455, .03, .515, .955);
// alternative, but less explicit about what it generates
@include transition-easing('in-out-quad');
@include transition-easing(.455, .03, .515, .955);
}
It looks that for the easings already included in easings.scss, there’s no benefit. But for custom easing curves, it’s a 8 characters saving.
Waiting for feedbacks (and mine after using the library in real projects during a few months).
Since support for Dart SASS has been added, the file structure of the project is a mess. It should be improved.
Very interesting use of custom properties for staggering/interpolating easings. Could something be created to improve the way it’s generated?
https://twitter.com/hexagoncircle/status/1285971735011946498
https://codepen.io/hexagoncircle/full/jOWXzrw
(Please note the question is not “How to write better timing functions”, but “How to better write [them]”).
I want to improve the way I write CSS cubic-bezier()
timing functions. I’d like to request ideas and opinions 🙏, and share a few ideas. What does (or doesn’t) work for you, and why?
What I’ve always done is using a variable coming from the SCSS library Bourbon:
.my-class {
transition: transform .3s $ease-in-out-quad;
}
which outputs:
.my-class {
transition: transform .3s cubic-bezier(0.55, 0.085, 0.68, 0.53);
}
It’s rather straightforward, but I’d like to replace this by using something else, more modern/powerful/straightforward.
It can use SCSS, PostCSS, or both, but it has to be framework agnostic.
Existing ideas:
:root
level.ease()
function requiring to write transition: transform .3s ease(easeInOutQuad);
.transition: transform .3s ease-in-out-quad;
to transform it using the matching cubic-bezier
value (camelCase also works: easeInOutQuad
).So, three types of solutions: custom properties, a SCSS function, and a PostCSS plugin.
There are various improvements that could be made to each. One of them is getting rid of the ease*
prefix in order to shorten the syntax:
.my-class {
transition: transform .3s $ease-in-out-quad; // SCSS variable
transition: transform .3s $in-out-quad; // shortened SCSS variable
transition: transform .3s var(--ease-in-out-quad); // custom prop
transition: transform .3s var(--in-out-quad); // custom prop shortened
transition: transform .3s ease-in-out-quad; // postcss-easings
transition: transform .3s in-out-quad; // postcss-easings shortened
}
Maybe one of the three type of solutions could fit as a good basis. But maybe shortening the syntax is only one part of the possible improvements and considerations that can be tackled.
See Reversing an easing curve. It’s powerful and important. I have not seen reversed easings in a library, yet, and I think it could easily be integrated in whatever solution.
Supposing a SCSS package, I’d probably want:
@import '~awesome-easings';
This single @import
would output all the easings available, this way:
$in-out-quad: var(--in-out-quad);
$in-quad: var(--in-quad);
/* more easings… */
:root {
--in-out-quad: cubic-bezier(.250, .460, .450, .940);
--in-quad: cubic-bezier(.550, .085, .680, .530);
/* more props… */
}
Alternatively, a partial import could be a solution:
@import '~awesome-easings/src/easings/in-out-quad';
A flag could exclude/include legacy output. Example with SCSS:
$awesome-easings-legacy: true;
@import '~awesome-easings';
.my-class {
transition: transform .3s $in-out-quad;
}
With $awesome-easing-legacy
, the CSS output should be:
.my-class {
transition: transform .3s cubic-bezier(.250, .460, .450, .940);
}
(Alternatively, postcss-preset-env is a better solution.)
GSAP names easings differently:
quad
is Power1
;cubic
is Power2
;quart
is Power3
;quint
is Power4
;But the following names are shared: sine
, expo
, circ
, back
.
That’s interesting because PowerX are named according to the math behind their curves (minus 1), and such a naming is very convenient to shape the acceleration/deceleration power of their curves.
So maybe it could be a good idea to alias quad
to power1
, for example.
At first I was thinking about taking advantage of GSAP naming to make a very short syntax. For example:
.my-class { transition: transform .3s e(4, io); // Power4.inOut, or $in-out-quint }But anything in that direction will likely cause readability issue.
Instead, a function could fit another purpose, like splitting an easing curve into several curves at specified breakpoints. This is inspired by split ease, a JavaScript function inserting a linear gap between the acceleration and the deceleration of an easing curve. So maybe this could give an idea for a useful function.
It could look like this:
/* Create 3 easing curves that are segments of $in-out-quad ranging:
- from 0 to 33% of the curve;
- from 33% to 80% of the curve;
- from 80% to 100% of the curve.
*/
$splitted-easing: ease-split($in-out-quad, 0.33, 0.8);
// Apply each curve to its own element
.my-class {
> :nth-child(1) {
transition: transform .33s ease($splitted-easing, 1));
}
> :nth-child(2) {
transition: transform .47s ease($splitted-easing, 2) .33s;
}
> :nth-child(3) {
transition: transform .2s ease($splitted-easing, 3) .8s;
}
}
Other idea: allowing easings to receive a cx (article).
<div class="in-out-quad">
I don’t have any interest or need, but who knows… Does someone have a good use case for this?
Of course, all of these shouldn’t prevent you to directly play with your custom easing curves using the dev tools.
Resources:
Check if it can be done, or contribute to larsenwork/postcss-easing-gradients.
Idea mentioned in #1.
See Reversing an easing curve. It’s powerful and important. I have not seen reversed easings in a library, yet.
in-out-quad-r
or in-out-quad-reversed
)reverse-bezier()
function to reverse a x1, x2, y1, y2
easing curveA declarative, efficient, and flexible JavaScript library for building user interfaces.
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