02Logo reveal

<main class="stage">
  <p class="mark">
    <svg viewBox="0 0 24 24" width="56" height="56" aria-hidden="true">
      <path class="mark__fill" d="M12 3L21 12L12 21L3 12Z"/>
      <path class="mark__trail" pathLength="100" d="M12 3L21 12L12 21L3 12Z"/>
      <path class="mark__line" pathLength="100" d="M12 3L21 12L12 21L3 12Z"/>
      <circle class="mark__spark" r="1" cx="12" cy="3"/>
      <circle class="mark__bit" r=".5" cx="12" cy="3" style="--dx:0px;--dy:-2.4px"/>
      <circle class="mark__bit" r=".45" cx="12" cy="3" style="--dx:2px;--dy:0px"/>
      <circle class="mark__bit" r=".45" cx="12" cy="3" style="--dx:-2px;--dy:0px"/>
    </svg>
    GODRICH
  </p>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-enter;   // 600ms — 선이 그려지는 시간
$easing: $ease-out;
$color: $subject-ink;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);

.mark {
  margin: 0;
  display: inline-flex; align-items: center; gap: clamp($sp-2, 3vw, $sp-3);
  color: $color; font-weight: 800; font-size: clamp(16px, 5vw, 22px); line-height: 1; font-family: inherit; letter-spacing: .08em;
}
.mark svg { width: clamp(44px, 13vw, 56px); height: clamp(44px, 13vw, 56px); }
.mark__fill {
  fill: $color; opacity: 0;
  animation: fill-in $duration $easing infinite;
}
.mark__line {
  fill: none; stroke: $color; stroke-width: 1.6;
  stroke-dasharray: 100;                    // pathLength="100"
  animation: line-draw $duration $easing infinite;
}

// 1단계: 선으로 그린다 → 2단계: 면을 채운다 → 다시 선만 남기고 반복
@keyframes line-draw {
  0%   { stroke-dashoffset: 100; opacity: 1; }
  55%  { stroke-dashoffset: 0;   opacity: 1; }
  70%  { opacity: 1; }
  85%  { opacity: 0; }
  100% { stroke-dashoffset: 0;   opacity: 0; }
}
@keyframes fill-in {
  0%, 55%  { opacity: 0; }
  75%, 85% { opacity: 1; }
  100%     { opacity: 0; }
}

// ── 한 겹: 펜 끝 스파크 + 미광 잔상 ──────────────────────
// 본선 뒤에 남는 잔상 — 지워질 때 본선보다 반박자 늦게 사라져 펜 자국이 빛난다
.mark__trail {
  fill: none; stroke: $color; stroke-width: 1.6;
  stroke-dasharray: 100;
  animation: trail-fade $duration $easing infinite;
}
@keyframes trail-fade {
  0%   { stroke-dashoffset: 100; opacity: .4; }
  55%  { stroke-dashoffset: 0;   opacity: .4; }
  78%  { stroke-dashoffset: 0;   opacity: .4; }
  100% { stroke-dashoffset: 0;   opacity: 0; }
}

// 펜 끝 스파크 — 그리기 단계에만 JS 가 좌표를 옮기고 켠다
.mark__spark {
  fill: $color;
  opacity: 0;
  transform: scale(1.5); transform-origin: center; transform-box: fill-box;
  filter: drop-shadow(0 0 1px $color);
}

// 펜이 지난 자리에서 진행 반대 방향으로 튀는 찌꺼기
.mark__bit {
  fill: $color;
  opacity: 0;
  animation: bit-fly 420ms $ease-out forwards;
}
@keyframes bit-fly {
  0%   { opacity: .9; transform: translate(0, 0) scale(1); }
  100% { opacity: 0;  transform: translate(var(--dx), var(--dy)) scale(.3); }
}

// ── 접근성: 움직임 줄이기 설정이면 완성된 마크만 남긴다 ──────
@media (prefers-reduced-motion: reduce) {
  .mark__line  { animation: none; stroke-dashoffset: 0; }
  .mark__fill  { animation: none; opacity: 1; }
  .mark__trail { display: none; }
  .mark__spark { display: none; }
  .mark__bit   { display: none; }
}

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);
}

.mark {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: clamp(8px, 3vw, 12px);
  color: #17141a;
  font-weight: 800;
  font-size: clamp(16px, 5vw, 22px);
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.08em;
}

.mark svg {
  width: clamp(44px, 13vw, 56px);
  height: clamp(44px, 13vw, 56px);
}

.mark__fill {
  fill: #17141a;
  opacity: 0;
  animation: fill-in 600ms ease-out infinite;
}

.mark__line {
  fill: none;
  stroke: #17141a;
  stroke-width: 1.6;
  stroke-dasharray: 100;
  animation: line-draw 600ms ease-out infinite;
}

@keyframes line-draw {
  0% {
    stroke-dashoffset: 100;
    opacity: 1;
  }
  55% {
    stroke-dashoffset: 0;
    opacity: 1;
  }
  70% {
    opacity: 1;
  }
  85% {
    opacity: 0;
  }
  100% {
    stroke-dashoffset: 0;
    opacity: 0;
  }
}
@keyframes fill-in {
  0%, 55% {
    opacity: 0;
  }
  75%, 85% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
.mark__trail {
  fill: none;
  stroke: #17141a;
  stroke-width: 1.6;
  stroke-dasharray: 100;
  animation: trail-fade 600ms ease-out infinite;
}

@keyframes trail-fade {
  0% {
    stroke-dashoffset: 100;
    opacity: 0.4;
  }
  55% {
    stroke-dashoffset: 0;
    opacity: 0.4;
  }
  78% {
    stroke-dashoffset: 0;
    opacity: 0.4;
  }
  100% {
    stroke-dashoffset: 0;
    opacity: 0;
  }
}
.mark__spark {
  fill: #17141a;
  opacity: 0;
  transform: scale(1.5);
  transform-origin: center;
  transform-box: fill-box;
  filter: drop-shadow(0 0 1px #17141a);
}

.mark__bit {
  fill: #17141a;
  opacity: 0;
  animation: bit-fly 420ms ease-out forwards;
}

@keyframes bit-fly {
  0% {
    opacity: 0.9;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) scale(0.3);
  }
}
@media (prefers-reduced-motion: reduce) {
  .mark__line {
    animation: none;
    stroke-dashoffset: 0;
  }
  .mark__fill {
    animation: none;
    opacity: 1;
  }
  .mark__trail {
    display: none;
  }
  .mark__spark {
    display: none;
  }
  .mark__bit {
    display: none;
  }
}

// 로고 리빌 한 겹 — 선 그리기 단계(0~55%)에서만 펜 끝을 추적해 스파크를 옮기고 찌꺼기를 뿌린다.
// 계산 방식은 01 과 같다: getTotalLength 로 실측한 경로 위를 getPointAtLength 로 훑는다.
(function () {
  var svg = document.querySelector('.mark svg');
  if (!svg) return;
  var line = svg.querySelector('.mark__line');
  var spark = svg.querySelector('.mark__spark');
  var bits = [].slice.call(svg.querySelectorAll('.mark__bit'));
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (reduce || !spark || !line.getTotalLength) { if (spark) spark.style.display = 'none'; return; }

  var L = line.getTotalLength();
  var prev = null, lastEmit = 0, emitIdx = 0;
  function frame(t) {
    var off = parseFloat(getComputedStyle(line).strokeDashoffset) || 0;
    var at = Math.max(0, Math.min(100, 100 - off));
    var p = line.getPointAtLength(at / 100 * L);
    if (prev && (Math.abs(p.x - prev.x) + Math.abs(p.y - prev.y)) > .05) {
      spark.setAttribute('cx', p.x);
      spark.setAttribute('cy', p.y);
      spark.style.opacity = 1;
      if (t - lastEmit > 60) {
        lastEmit = t;
        var ang = Math.atan2(p.y - prev.y, p.x - prev.x) + Math.PI;
        var sp = .4 + Math.random() * .5;
        var b = bits[emitIdx++ % bits.length];
        b.setAttribute('cx', p.x);
        b.setAttribute('cy', p.y);
        b.style.setProperty('--dx', (Math.cos(ang) * sp * 5).toFixed(2) + 'px');
        b.style.setProperty('--dy', (Math.sin(ang) * sp * 5).toFixed(2) + 'px');
        b.style.animation = 'none';
        void b.getBBox;
        b.style.animation = '';
        b.style.animationName = 'bit-fly';
      }
      prev = p;
    } else {
      if (prev) spark.style.opacity = 0;
      if (!prev) prev = p;
    }
    requestAnimationFrame(frame);
  }
  requestAnimationFrame(frame);
})();

import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./LogoReveal.module.scss";

export type LogoRevealProps = {
  wordmark?: string;
  /** 선이 그려지는 시간, ms */
  duration?: number;
  easing?: string;
  color?: string;
};

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

const BIT_DIRS: Array<[number, number]> = [
  [0, -2.4],
  [2, 0],
  [-2, 0],
];

export default function LogoReveal({
  wordmark = "GODRICH",
  duration = 600,
  easing = "ease-out",
  color = "#17141a",
}: LogoRevealProps) {
  const lineRef = useRef<SVGPathElement>(null);
  const sparkRef = useRef<SVGCircleElement>(null);
  const bitRefs = useRef<Array<SVGCircleElement | null>>([]) as unknown as { current: Array<SVGCircleElement | null> };

  // 한 겹: 펜 끝 추적 — getTotalLength 실측 + getPointAtLength 로 스파크를 옮기고
  // 이동 방향 뒤쪽으로 찌꺼기를 방출한다 (vanilla 데모와 동일 계산)
  useEffect(() => {
    const line = lineRef.current, spark = sparkRef.current;
    if (!line || !spark || !line.getTotalLength) return;
    if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return;
    const L = line.getTotalLength();
    const bits = bitRefs.current.filter(Boolean) as SVGCircleElement[];
    let prev: DOMPoint | null = null, lastEmit = 0, emitIdx = 0, raf = 0;
    const frame = (t: number) => {
      const off = parseFloat(getComputedStyle(line).strokeDashoffset) || 0;
      const at = Math.max(0, Math.min(100, 100 - off));
      const p = line.getPointAtLength(at / 100 * L);
      if (prev && Math.abs(p.x - prev.x) + Math.abs(p.y - prev.y) > 0.05) {
        spark.setAttribute("cx", String(p.x));
        spark.setAttribute("cy", String(p.y));
        spark.style.opacity = "1";
        if (t - lastEmit > 60 && bits.length) {
          lastEmit = t;
          const ang = Math.atan2(p.y - prev.y, p.x - prev.x) + Math.PI;
          const sp = 0.4 + Math.random() * 0.5;
          const b = bits[emitIdx++ % bits.length];
          b.setAttribute("cx", String(p.x));
          b.setAttribute("cy", String(p.y));
          b.style.setProperty("--dx", (Math.cos(ang) * sp * 5).toFixed(2) + "px");
          b.style.setProperty("--dy", (Math.sin(ang) * sp * 5).toFixed(2) + "px");
          b.style.animation = "none";
          void b.getBoundingClientRect();
          b.style.animation = "";
        }
        prev = p;
      } else {
        if (prev) spark.style.opacity = "0";
        if (!prev) prev = p;
      }
      raf = requestAnimationFrame(frame);
    };
    raf = requestAnimationFrame(frame);
    return () => cancelAnimationFrame(raf);
  }, []);

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <p className={styles.mark} style={vars}>
      <svg viewBox="0 0 24 24" width="56" height="56" aria-hidden="true">
        <path className={styles.mark__fill} d="M12 3L21 12L12 21L3 12Z" />
        <path className={styles.mark__trail} pathLength={100} d="M12 3L21 12L12 21L3 12Z" />
        <path ref={lineRef} className={styles.mark__line} pathLength={100} d="M12 3L21 12L12 21L3 12Z" />
        <circle ref={sparkRef} className={styles.mark__spark} r={1} cx={12} cy={3} />
        {BIT_DIRS.map(([dx, dy], i) => (
          <circle
            key={i}
            ref={(el: SVGCircleElement | null) => { bitRefs.current[i] = el; }}
            className={styles.mark__bit}
            r={i === 0 ? 0.5 : 0.45}
            cx={12}
            cy={3}
            style={{ "--dx": `${dx}px`, "--dy": `${dy}px` } as CSSProperties}
          />
        ))}
      </svg>
      {wordmark}
    </p>
  );
}