06Vòng tròn stroke-dashoffset

<main class="stage">
  <svg class="spinner" viewBox="0 0 44 44" width="56" height="56" role="status" aria-label="Đang tải">
    <circle class="spinner__track" cx="22" cy="22" r="18" fill="none" stroke-width="4"></circle>
    <circle class="spinner__arc" cx="22" cy="22" r="18" fill="none" stroke-width="4"></circle>
  </svg>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration-spin: 1.4s;                             // svg 전체가 도는 시간
$duration-dash: 1.4s;                             // 궤적이 늘었다 줄었다 하는 시간
$color: $subject-ink;                             // 궤적 색

@include stage($stage-yellow);

.spinner {
  animation: spin $duration-spin linear infinite;
  transform-origin: center;
}
.spinner__track {
  stroke: rgba($subject-ink, .15);
}
.spinner__arc {
  stroke: $color;
  stroke-linecap: round;
  stroke-dasharray: 113;                          // 2 * π * 18 ≈ 113
  stroke-dashoffset: 90;
  animation: dash $duration-dash ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes dash {
  0%   { stroke-dashoffset: 100; }
  50%  { stroke-dashoffset: 20; }
  100% { stroke-dashoffset: 100; }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; }
  .spinner__arc { animation: none; stroke-dashoffset: 60; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.spinner {
  animation: spin 1.4s linear infinite;
  transform-origin: center;
}

.spinner__track {
  stroke: rgba(23, 20, 26, 0.15);
}

.spinner__arc {
  stroke: #17141a;
  stroke-linecap: round;
  stroke-dasharray: 113;
  stroke-dashoffset: 90;
  animation: dash 1.4s ease-in-out infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes dash {
  0% {
    stroke-dashoffset: 100;
  }
  50% {
    stroke-dashoffset: 20;
  }
  100% {
    stroke-dashoffset: 100;
  }
}
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }
  .spinner__arc {
    animation: none;
    stroke-dashoffset: 60;
  }
}

import type { CSSProperties } from "react";
import styles from "./DashCircleSpinner.module.scss";

export type DashCircleSpinnerProps = {
  /** svg 전체가 도는 시간 (기본 1400ms) */
  durationSpin?: number;
  /** 궤적이 늘었다 줄었다 하는 시간 (기본 1400ms) */
  durationDash?: number;
  /** 궤적 색 */
  color?: string;
  label?: string;
};

type Vars = CSSProperties & { "--duration-spin"?: string; "--duration-dash"?: string; "--color"?: string };

export default function DashCircleSpinner({
  durationSpin = 1400,
  durationDash = 1400,
  color = "#17141a",
  label = "Loading",
}: DashCircleSpinnerProps) {
  const vars: Vars = {
    "--duration-spin": `${durationSpin}ms`,
    "--duration-dash": `${durationDash}ms`,
    "--color": color,
  };
  return (
    <svg
      className={styles.spinner}
      style={vars}
      viewBox="0 0 44 44"
      width="56"
      height="56"
      role="status"
      aria-label={label}
    >
      <circle className={styles.track} cx="22" cy="22" r="18" fill="none" strokeWidth="4" />
      <circle className={styles.arc} cx="22" cy="22" r="18" fill="none" strokeWidth="4" />
    </svg>
  );
}