How Can You Create Segments in a Circle Using CSS and Handle Different Slice Requirements?

Segments in a Circle Using CSS: Handling Different Slice Requirements

While CSS allows for creating circles using the border radius hack, extending this technique to include segments presents a challenge. However, there is a solution that involves combining CSS and SCSS to achieve this without resorting to JavaScript.

Generating Equal Slices

If the slices do not require distinct elements and are of equal size, SCSS provides the flexibility to generate a list of stops for a conic-gradient. Given a color palette, a SCSS function can distribute the stops evenly around the circle.

<code class="scss">@function stops($c) {
  $n: length($c);
  $p: 100%/$n;
  $l: ();

  @for $i from 1 through $n {
    $l: $l, nth($c, $i) 
      if($i > 1, 0%, unquote(''))
      if($i < $n, round($i*$p), unquote(''))
  }

  @return $l
}</code>

Using Conic-Gradient for Segments

With the stop list generated, a conic-gradient is used to paint the segments onto the circular element. For equal-sized segments, the code is straightforward:

<code class="css">.pie {
  width: 20em;
  aspect-ratio: 1;
  border-radius: 50%;
  background: conic-gradient(stops($c))
}</code>

Controlling Starting Angle

To ensure the segments start at a specific angle (other than 12 o'clock), the from keyword can be added to the conic-gradient():

<code class="css">background: conic-gradient(from 17deg, stops($c))</code>

Handling Content-Rich Slices

For segments that need content or require animation out of the circle, a more complex approach is necessary. This involves using pseudo-elements and CSS animations to achieve the desired result.

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