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# CSS Animated Hexagon Wave

Page by Murray Bourne, IntMath.com. Last updated: 28 January 2019.

Most animations like the one below require javascript, but this one is pure CSS. It means it flows more smoothly than if we used a javascript approach, and takes less processing power.

## SCSS

This was my first experience working with SCSS ("Sassy CSS"), an extension language for CSS. The concept behind SCSS is you can write a .scss file using variables and loops, and a compiler will interpret that file into something the browser can use, and save it as a .css file (which you can seee the result of in the code for this page). See below the animation for more details.

## The Concept

There are 50 divs with class .hexagon, each containing a span.

The divs are translated by even amounts around the frame, and animated with a slight offset, giving the wave effect.

Tsankashvili's original Codepen made use of HAML to translate super-simple instructions into HTML, but I just coded the HTML directly (with the help of PHP).

## The SCSS

The SCSS makes use of these 3 variables:

$size: 50px;$circle-count: 50;
$speed: 3s; The variables are utilized in the following manner for the widths, heights and radii of the objects: .hexagon{ width:$size;
height: $size / 2; &, span{ border-top-left-radius:$size;
border-bottom-right-radius: $size; } ...  The coolest part is this loop, which sets the color, transform and animation properties of each of the divs: @for$i from 1 through $circle-count{ &:nth-child(#{$i}){
$color:$i * 360 / $circle-count; transform: rotate(-$i * 360deg / $circle-count) translate($size + 100px);
color: hsla($color,100%,50%,1); span{ animation-delay: -$i * $speed * 3 /$circle-count;
background-color: hsla(\$color,100%,50%,0.5);
}
}
}


For a compiler, I made use of Koala, a "GUI application for Less, Sass, Compass and CoffeeScript compilation", which was a 10-minute download and deploy process.

## The math

As usual with any animations involving circles and hexagone, trigonometry and geometry are involved, and of course transformational geometry as previously mentioned.

## Credits

Based heavily on Hexagon Codepen by Tsankashvili

### Screen shot

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