07複数レーン比較切替 — 並んだ2本以上の帯がそれぞれ異なる値で並行して満ちる方式

<main class="stage">
<div class="gb is-demo" id="gb">
  <div class="gb__head">
    <span class="gb__label">進行度比較</span>
  </div>
  <div class="gb__lanes" id="gbLanes"></div>
  <button type="button" class="gb__hit" id="gbJolt">順位を揺らす</button>
</div>
</main>

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

// 계산 겹: index.html render() 가 매 프레임 4레인 값을 계산해 내림차순 정렬하고
// 선두·2위 차이만큼만 밝은 겹을 얹는다. 왕관 표시는 DOM 순서를 바꾸지 않고
// translateY 로 현재 선두 행에만 옮겨진다 — 값의 사인 궤적도 계산이다.
@include stage($stage-orange);

.gb { width: 100%; max-width: 280px; background: $subject-cream; border-radius: $r-card; padding: $sp-5; box-shadow: $shadow-raised; box-sizing: border-box; }
.gb__head { margin-bottom: $sp-3; }
.gb__label { font-size: 12px; font-weight: 700; letter-spacing: .04em; color: rgba($subject-ink, .72); text-transform: uppercase; }

.gb__lanes { position: relative; display: flex; flex-direction: column; gap: $sp-2; }
.gb__row { display: flex; align-items: center; gap: $sp-2; height: 22px; }
.gb__laneLabel { width: 14px; font-size: 12px; font-weight: 700; color: $subject-ink; flex: 0 0 auto; }
.gb__laneTrack { position: relative; flex: 1 1 auto; height: 10px; border-radius: $r-pill; background: rgba($subject-ink, .1); overflow: hidden; }
.gb__laneFill { position: absolute; left: 0; top: 0; height: 100%; width: 0%; border-radius: $r-pill; background: $subject-blue; will-change: width; }
.gb__laneFill--lead { background: $subject-blue-deep; }
.gb__laneLead {
  position: absolute; top: 0; height: 100%; width: 0%; left: 0%;
  background: $subject-mint; opacity: 0; will-change: width, left, opacity;
}

.gb__crown {
  position: absolute; left: -2px; top: 0;
  width: 0; height: 0; border-style: solid;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent $subject-orange-deep;
  transform: translateY(0px); will-change: transform;
}

.gb__hit {
  margin-top: $sp-4; width: 100%; border: none; border-radius: $r-control;
  background: $subject-blue; color: $subject-cream;
  font-weight: 700; font-size: 13px; line-height: 1;
  padding: $sp-3 0; cursor: pointer;
}
.gb__hit:active { box-shadow: $shadow-press; }

@media (max-width: 340px) {
  .gb { max-width: 220px; padding: $sp-3; }
  .gb__head { margin-bottom: $sp-2; }
  .gb__label { font-size: 10px; }
  .gb__lanes { gap: $sp-1; }
  .gb__row { height: 14px; gap: $sp-1; }
  .gb__laneLabel { font-size: 10px; }
  .gb__crown { border-width: 4px 0 4px 6px; }
  .gb__hit { margin-top: $sp-2; padding: $sp-2 0; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .gb__laneFill, .gb__laneLead, .gb__crown { transition: none !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.gb {
  width: 100%;
  max-width: 280px;
  background: #fff7e6;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  box-sizing: border-box;
}

.gb__head {
  margin-bottom: 12px;
}

.gb__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: rgba(23, 20, 26, 0.72);
  text-transform: uppercase;
}

.gb__lanes {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gb__row {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 22px;
}

.gb__laneLabel {
  width: 14px;
  font-size: 12px;
  font-weight: 700;
  color: #17141a;
  flex: 0 0 auto;
}

.gb__laneTrack {
  position: relative;
  flex: 1 1 auto;
  height: 10px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.1);
  overflow: hidden;
}

.gb__laneFill {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: #2f6df6;
  will-change: width;
}

.gb__laneFill--lead {
  background: #0a4fe8;
}

.gb__laneLead {
  position: absolute;
  top: 0;
  height: 100%;
  width: 0%;
  left: 0%;
  background: #4cd4a6;
  opacity: 0;
  will-change: width, left, opacity;
}

.gb__crown {
  position: absolute;
  left: -2px;
  top: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 5px 0 5px 7px;
  border-color: transparent transparent transparent #c93000;
  transform: translateY(0px);
  will-change: transform;
}

.gb__hit {
  margin-top: 16px;
  width: 100%;
  border: none;
  border-radius: 12px;
  background: #2f6df6;
  color: #fff7e6;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  padding: 12px 0;
  cursor: pointer;
}

.gb__hit:active {
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

@media (max-width: 340px) {
  .gb {
    max-width: 220px;
    padding: 12px;
  }
  .gb__head {
    margin-bottom: 8px;
  }
  .gb__label {
    font-size: 10px;
  }
  .gb__lanes {
    gap: 4px;
  }
  .gb__row {
    height: 14px;
    gap: 4px;
  }
  .gb__laneLabel {
    font-size: 10px;
  }
  .gb__crown {
    border-width: 4px 0 4px 6px;
  }
  .gb__hit {
    margin-top: 8px;
    padding: 8px 0;
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .gb__laneFill, .gb__laneLead, .gb__crown {
    transition: none !important;
  }
}

(function () {
  // 계산 겹 상수: 레인마다 다른 위상·주파수의 사인 궤적 — 시드 고정, Math.random 미사용
  var LANES = [
    { label: 'A', base: 55, amp: 22, freq: .55, phase: 0.0, offset: 0 },
    { label: 'B', base: 60, amp: 18, freq: .70, phase: 1.3, offset: 0 },
    { label: 'C', base: 45, amp: 25, freq: .40, phase: 2.8, offset: 0 },
    { label: 'D', base: 50, amp: 20, freq: .62, phase: 4.1, offset: 0 }
  ];
  var JOLTS = [
    [0, 0, 20, 0],
    [-15, 0, 0, 18],
    [0, 22, -10, 0],
    [16, -12, 0, 0]
  ]; // 클릭마다 순환 적용되는 레인별 고정 오프셋 증가량
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var gb = document.getElementById('gb');
  var lanesEl = document.getElementById('gbLanes');
  var joltBtn = document.getElementById('gbJolt');

  var rows = LANES.map(function (l) {
    var row = document.createElement('div');
    row.className = 'gb__row';
    var label = document.createElement('span');
    label.className = 'gb__laneLabel';
    label.textContent = l.label;
    var track = document.createElement('div');
    track.className = 'gb__laneTrack';
    var fill = document.createElement('div');
    fill.className = 'gb__laneFill';
    var lead = document.createElement('div');
    lead.className = 'gb__laneLead';
    track.appendChild(fill);
    track.appendChild(lead);
    row.appendChild(label);
    row.appendChild(track);
    lanesEl.appendChild(row);
    return { row: row, fill: fill, lead: lead };
  });

  var crown = document.createElement('div');
  crown.className = 'gb__crown';
  lanesEl.appendChild(crown);

  // 계산 겹: 왕관을 옮기는 간격은 고정 px 이 아니라 실제 행 간격을 측정한 값이다 — 320px 폭에서
  // 행 높이·행간이 좁아져도(미디어 쿼리) 왕관이 항상 정확히 다음 행 위에 앉는다.
  var rowStep = rows.length > 1
    ? rows[1].row.getBoundingClientRect().top - rows[0].row.getBoundingClientRect().top
    : rows[0].row.getBoundingClientRect().height;

  var isDemo = true;
  var joltIdx = 0;

  function valuesAt(t) {
    return LANES.map(function (l) {
      var v = l.base + l.offset + l.amp * Math.sin(l.freq * t / 1000 + l.phase);
      return Math.max(4, Math.min(100, v));
    });
  }

  function human() {
    if (isDemo) { gb.classList.remove('is-demo'); isDemo = false; }
  }

  joltBtn.addEventListener('click', function () {
    human();
    var d = JOLTS[joltIdx % JOLTS.length];
    for (var i = 0; i < LANES.length; i++) LANES[i].offset += d[i];
    joltIdx++;
  });
  joltBtn.addEventListener('keydown', function (ev) {
    if (ev.key !== 'Enter' && ev.key !== ' ') return;
    ev.preventDefault();
    joltBtn.click();
  });

  function render(t) {
    var values = valuesAt(t);
    var sorted = values.slice().sort(function (a, b) { return b - a; });
    var leaderVal = sorted[0];
    var secondVal = sorted[1];
    var leaderIdx = values.indexOf(leaderVal);

    for (var i = 0; i < rows.length; i++) {
      var v = values[i];
      rows[i].fill.style.width = v.toFixed(2) + '%';
      var isLeader = i === leaderIdx;
      rows[i].fill.classList.toggle('gb__laneFill--lead', isLeader);
      // 계산 겹: 선두와 2위의 값 차이만큼만 밝은 겹으로 얹어 "얼마나 앞섰는지" 를 보인다
      if (isLeader && leaderVal - secondVal > 0.3) {
        rows[i].lead.style.left = secondVal.toFixed(2) + '%';
        rows[i].lead.style.width = (leaderVal - secondVal).toFixed(2) + '%';
        rows[i].lead.style.opacity = '1';
      } else {
        rows[i].lead.style.opacity = '0';
      }
    }
    // 계산 겹: translateY 로 왕관 표시를 현재 선두 레인 행으로 옮긴다(DOM 재배치 없이 순위만 계산)
    crown.style.transform = 'translateY(' + (leaderIdx * rowStep) + 'px)';
  }

  function loop(ts) {
    render(ts);
    requestAnimationFrame(loop);
  }

  if (!reduce) {
    requestAnimationFrame(loop);
  } else {
    render(0);
  }
})();

import { useEffect, useRef, useState } from 'react';
import styles from './GaugeBarMultiLaneCompare.module.scss';

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

// 계산 겹 상수: 레인마다 다른 위상·주파수의 사인 궤적 — 시드 고정, Math.random 미사용
type Lane = { label: string; base: number; amp: number; freq: number; phase: number; offset: number };
const LANES_INIT: Lane[] = [
  { label: 'A', base: 55, amp: 22, freq: 0.55, phase: 0.0, offset: 0 },
  { label: 'B', base: 60, amp: 18, freq: 0.70, phase: 1.3, offset: 0 },
  { label: 'C', base: 45, amp: 25, freq: 0.40, phase: 2.8, offset: 0 },
  { label: 'D', base: 50, amp: 20, freq: 0.62, phase: 4.1, offset: 0 },
];
const JOLTS = [
  [0, 0, 20, 0],
  [-15, 0, 0, 18],
  [0, 22, -10, 0],
  [16, -12, 0, 0],
]; // 클릭마다 순환 적용되는 레인별 고정 오프셋 증가량

function valuesAt(lanes: Lane[], t: number) {
  return lanes.map((l) => {
    const v = l.base + l.offset + l.amp * Math.sin((l.freq * t) / 1000 + l.phase);
    return Math.max(4, Math.min(100, v));
  });
}

export default function GaugeBarMultiLaneCompare() {
  const fillRefs = useRef(Array.from({ length: 4 }, () => null)) as unknown as Box<(HTMLDivElement | null)[]>;
  const leadRefs = useRef(Array.from({ length: 4 }, () => null)) as unknown as Box<(HTMLDivElement | null)[]>;
  const rowRefs = useRef(Array.from({ length: 4 }, () => null)) as unknown as Box<(HTMLDivElement | null)[]>;
  const crownRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const isDemoRef = useRef(true) as unknown as Box<boolean>;
  const [isDemo, setIsDemo] = useState(true);

  const lanesRef = useRef(LANES_INIT.map((l) => ({ ...l }))) as unknown as Box<Lane[]>;
  const joltIdxRef = useRef(0) as unknown as Box<number>;
  // 계산 겹: 왕관 이동 간격은 고정 px 이 아니라 실제 행 간격을 측정한 값이다(vanilla 와 동일 원칙)
  const rowStepRef = useRef(30) as unknown as Box<number>;

  function human() {
    isDemoRef.current = false;
    setIsDemo(false);
  }

  function render(t: number) {
    const lanes = lanesRef.current;
    const values = valuesAt(lanes, t);
    const sorted = values.slice().sort((a, b) => b - a);
    const leaderVal = sorted[0];
    const secondVal = sorted[1];
    const leaderIdx = values.indexOf(leaderVal);

    for (let i = 0; i < lanes.length; i++) {
      const v = values[i];
      const fill = fillRefs.current[i];
      const lead = leadRefs.current[i];
      const isLeader = i === leaderIdx;
      if (fill) {
        fill.style.width = v.toFixed(2) + '%';
        fill.classList.toggle(styles.gbLaneFillLead, isLeader);
      }
      // 계산 겹: 선두와 2위의 값 차이만큼만 밝은 겹으로 얹어 "얼마나 앞섰는지" 를 보인다
      if (lead) {
        if (isLeader && leaderVal - secondVal > 0.3) {
          lead.style.left = secondVal.toFixed(2) + '%';
          lead.style.width = (leaderVal - secondVal).toFixed(2) + '%';
          lead.style.opacity = '1';
        } else {
          lead.style.opacity = '0';
        }
      }
    }
    // 계산 겹: translateY 로 왕관 표시를 현재 선두 레인 행으로 옮긴다(DOM 재배치 없이 순위만 계산)
    const crown = crownRef.current;
    if (crown) crown.style.transform = 'translateY(' + leaderIdx * rowStepRef.current + 'px)';
  }

  useEffect(() => {
    const rows = rowRefs.current;
    if (rows[0] && rows[1]) {
      rowStepRef.current = rows[1].getBoundingClientRect().top - rows[0].getBoundingClientRect().top;
    } else if (rows[0]) {
      rowStepRef.current = rows[0].getBoundingClientRect().height;
    }
    const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
    let rafId = 0;
    function loop(ts: number) {
      render(ts);
      rafId = requestAnimationFrame(loop);
    }
    if (!reduce) {
      rafId = requestAnimationFrame(loop);
    } else {
      render(0);
    }
    return () => cancelAnimationFrame(rafId);
  }, []);

  function onJolt() {
    human();
    const d = JOLTS[joltIdxRef.current % JOLTS.length];
    const lanes = lanesRef.current;
    for (let i = 0; i < lanes.length; i++) lanes[i].offset += d[i];
    joltIdxRef.current++;
  }

  function onKeyDown(e: { key: string; preventDefault: () => void }) {
    if (e.key !== 'Enter' && e.key !== ' ') return;
    e.preventDefault();
    onJolt();
  }

  return (
    <div className={`${styles.gb} ${isDemo ? styles.isDemo : ''}`}>
      <div className={styles.gbHead}>
        <span className={styles.gbLabel}>진행도 비교</span>
      </div>
      <div className={styles.gbLanes}>
        {LANES_INIT.map((l, i) => (
          <div
            className={styles.gbRow}
            key={l.label}
            ref={(el: HTMLDivElement | null) => { rowRefs.current[i] = el; }}
          >
            <span className={styles.gbLaneLabel}>{l.label}</span>
            <div className={styles.gbLaneTrack}>
              <div className={styles.gbLaneFill} ref={(el: HTMLDivElement | null) => { fillRefs.current[i] = el; }} />
              <div className={styles.gbLaneLead} ref={(el: HTMLDivElement | null) => { leadRefs.current[i] = el; }} />
            </div>
          </div>
        ))}
        <div className={styles.gbCrown} ref={crownRef} />
      </div>
      <button type="button" className={styles.gbHit} onClick={onJolt} onKeyDown={onKeyDown}>
        순위 흔들기
      </button>
    </div>
  );
}