05Extraction progress and form values changing together — while the extraction progress value fills, a form value changes along with it

<main class="stage">
<div class="dem is-demo" id="dem">
  <svg class="dem__shape" viewBox="0 0 100 100">
    <polygon class="dem__poly" id="demPoly" points=""></polygon>
  </svg>
  <div class="dem__row">
    <span class="dem__label">Extracting</span>
    <span class="dem__pct" id="demPct">0%</span>
  </div>
  <div class="dem__track"><div class="dem__fill" id="demFill"></div></div>
  <button class="dem__btn" id="demBtn" type="button">Pause</button>
</div>
</main>

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

// 계산 겹: 진행 값으로 8점 좌표 선형보간(lerp) — index.html lerpPoints() 참조. 크로스페이드 아님
@include stage($stage-paper);

.dem {
  width: 100%;
  max-width: 200px;
  display: grid;
  justify-items: center;
  gap: $sp-2;
}

.dem__shape {
  width: 120px;
  height: 120px;
}

.dem__poly {
  fill: $subject-lilac;
  stroke: $subject-blue-deep;
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.dem__row {
  width: 100%;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font: 600 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $subject-ink;
}

.dem__pct { font-variant-numeric: tabular-nums; }

.dem__track {
  width: 100%;
  height: $sp-2;
  border-radius: $r-pill;
  background: $subject-cream;
  overflow: hidden;
}

.dem__fill {
  height: 100%;
  width: 100%;
  transform-origin: left center;
  transform: scaleX(0);
  border-radius: $r-pill;
  background: $subject-blue-deep;
}

.dem__btn {
  margin-top: $sp-1;
  width: 100%;
  border: 0;
  border-radius: $r-control;
  padding: $sp-2 $sp-4;
  background: $subject-ink;
  color: $subject-cream;
  font: 700 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;

  &:active { transform: scale(.96); }
}

@media (max-width: 340px) {
  .dem { max-width: 170px; }
  .dem__shape { width: 96px; height: 96px; }
}

@media (prefers-reduced-motion: reduce) {
  .dem__btn { transition: none; }
}

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

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

.dem {
  width: 100%;
  max-width: 200px;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.dem__shape {
  width: 120px;
  height: 120px;
}

.dem__poly {
  fill: #b9a0ff;
  stroke: #0a4fe8;
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.dem__row {
  width: 100%;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font: 600 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
}

.dem__pct {
  font-variant-numeric: tabular-nums;
}

.dem__track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: #fff7e6;
  overflow: hidden;
}

.dem__fill {
  height: 100%;
  width: 100%;
  transform-origin: left center;
  transform: scaleX(0);
  border-radius: 999px;
  background: #0a4fe8;
}

.dem__btn {
  margin-top: 4px;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 8px 16px;
  background: #17141a;
  color: #fff7e6;
  font: 700 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform 140ms ease-out;
}
.dem__btn:active {
  transform: scale(0.96);
}

@media (max-width: 340px) {
  .dem {
    max-width: 170px;
  }
  .dem__shape {
    width: 96px;
    height: 96px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .dem__btn {
    transition: none;
  }
}

(function () {
  var poly = document.getElementById('demPoly');
  var pctEl = document.getElementById('demPct');
  var fill = document.getElementById('demFill');

  // 상수: 시작 형태(닫힌 상자, 8점) · 끝 형태(펼친 도형, 같은 8점 순서) — index.html
  var BOX = [[30, 25], [70, 25], [70, 40], [70, 55], [70, 75], [30, 75], [30, 55], [30, 40]];
  var OPEN = [[15, 30], [85, 20], [78, 45], [88, 60], [72, 82], [28, 88], [18, 58], [10, 42]];
  var DUR_MS = 2400;

  var start = performance.now();
  var pausedAt = 0;
  var paused = false;
  var btn = document.getElementById('demBtn');

  // 계산 겹: In progress 값(0~1)으로 8개 점 좌표를 각각 선형보간(lerp) — 두 도형을 겹쳐 페이드하지 않는다
  function lerpPoints(t) {
    var out = [];
    for (var i = 0; i < BOX.length; i++) {
      var x = BOX[i][0] + (OPEN[i][0] - BOX[i][0]) * t;
      var y = BOX[i][1] + (OPEN[i][1] - BOX[i][1]) * t;
      out.push(x.toFixed(1) + ',' + y.toFixed(1));
    }
    return out.join(' ');
  }

  function paint(t) {
    poly.setAttribute('points', lerpPoints(t));
    fill.style.transform = 'scaleX(' + t.toFixed(3) + ')';
    pctEl.textContent = Math.round(t * 100) + '%';
  }

  function frame(now) {
    if (!paused) {
      var e = (now - start) % DUR_MS;
      pausedAt = e / DUR_MS;
      paint(pausedAt);
    }
    requestAnimationFrame(frame);
  }
  requestAnimationFrame(frame);

  btn.addEventListener('click', function () {
    document.getElementById('dem').classList.remove('is-demo');
    paused = !paused;
    btn.textContent = paused ? 'Resume' : 'Pause';
    if (!paused) start = performance.now() - pausedAt * DUR_MS;
  });
})();

import { useEffect, useRef } from "react";
import styles from "./DownloadManagerExtractMorph.module.scss";

type Box<T> = { current: T };

export default function DownloadManagerExtractMorph() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement | null>;

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const poly = root.querySelector(`.${styles.poly}`) as SVGPolygonElement | null;
    const pctEl = root.querySelector(`.${styles.pct}`) as HTMLElement | null;
    const fill = root.querySelector(`.${styles.fill}`) as HTMLElement | null;
    const btn = root.querySelector(`.${styles.btn}`) as HTMLElement | null;
    if (!poly || !pctEl || !fill || !btn) return;

    // 상수: 시작 형태(닫힌 상자, 8점) · 끝 형태(펼친 도형, 같은 8점 순서)
    const BOX: [number, number][] = [[30, 25], [70, 25], [70, 40], [70, 55], [70, 75], [30, 75], [30, 55], [30, 40]];
    const OPEN: [number, number][] = [[15, 30], [85, 20], [78, 45], [88, 60], [72, 82], [28, 88], [18, 58], [10, 42]];
    const DUR_MS = 2400;

    let start = performance.now();
    let pausedAt = 0;
    let paused = false;
    let stopped = false;
    let rafId = 0;

    // 계산 겹: 진행 값(0~1)으로 8개 점 좌표를 각각 선형보간(lerp) — 두 도형을 겹쳐 페이드하지 않는다
    function lerpPoints(t: number) {
      const out: string[] = [];
      for (let i = 0; i < BOX.length; i++) {
        const x = BOX[i][0] + (OPEN[i][0] - BOX[i][0]) * t;
        const y = BOX[i][1] + (OPEN[i][1] - BOX[i][1]) * t;
        out.push(x.toFixed(1) + "," + y.toFixed(1));
      }
      return out.join(" ");
    }

    function paint(t: number) {
      poly!.setAttribute("points", lerpPoints(t));
      fill!.style.transform = "scaleX(" + t.toFixed(3) + ")";
      pctEl!.textContent = Math.round(t * 100) + "%";
    }

    function frame(now: number) {
      if (stopped) return;
      if (!paused) {
        const e = (now - start) % DUR_MS;
        pausedAt = e / DUR_MS;
        paint(pausedAt);
      }
      rafId = requestAnimationFrame(frame);
    }
    rafId = requestAnimationFrame(frame);

    function onClick() {
      root!.classList.remove(styles["is-demo"]);
      paused = !paused;
      btn!.textContent = paused ? "재개" : "일시정지";
      if (!paused) start = performance.now() - pausedAt * DUR_MS;
    }
    btn.addEventListener("click", onClick);

    return () => {
      stopped = true;
      cancelAnimationFrame(rafId);
      btn.removeEventListener("click", onClick);
    };
  }, []);

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.dem} ${styles["is-demo"]}`}>
      <svg className={styles.shape} viewBox="0 0 100 100">
        <polygon className={styles.poly} points="" />
      </svg>
      <div className={styles.row}>
        <span className={styles.label}>압축 해제</span>
        <span className={styles.pct}>0%</span>
      </div>
      <div className={styles.track}><div className={styles.fill} /></div>
      <button className={styles.btn} type="button">일시정지</button>
    </div>
  );
}