03Segment-pip crack toggle — the bar splits into pips, and dropping past one pip leaves a crack pattern on it

<main class="stage">
<div class="gb is-demo" id="gb">
  <div class="gb__head">
    <span class="gb__label">Boss HP</span>
    <span class="gb__value" id="gbValue">5 / 5</span>
  </div>
  <div class="gb__track" id="gbTrack" role="progressbar" aria-label="Boss HP" aria-valuemin="0" aria-valuemax="5" aria-valuenow="5"></div>
  <button type="button" class="gb__hit" id="gbBreak">Break Segment</button>
</div>
</main>

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

// 계산 겹: index.html stateFor() 가 각 칸이 깨진 시각과 현재 시각의 차(dt)로
// 균열 두 줄의 등장 시점(stagger)과 채움 투명도를 매 프레임 다시 계산한다.
@include stage($stage-orange);

.gb { width: 100%; max-width: 260px; background: $subject-cream; border-radius: $r-card; padding: $sp-5; box-shadow: $shadow-raised; box-sizing: border-box; }
.gb__head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: $sp-3; }
.gb__label { font-size: 12px; font-weight: 700; letter-spacing: .04em; color: rgba($subject-ink, .72); text-transform: uppercase; }
.gb__value { font-size: 15px; font-weight: 700; color: $subject-ink; }

.gb__track { display: grid; grid-template-columns: repeat(5, 1fr); gap: $sp-1; height: 22px; }
.gb__pip { position: relative; border-radius: $r-xs; background: rgba($subject-ink, .12); overflow: hidden; }
.gb__pipFill { position: absolute; inset: 0; background: $subject-blue-deep; opacity: 1; will-change: opacity; }
.gb__crack {
  position: absolute; left: 50%; top: 50%; width: 2px; height: 70%;
  background: $subject-cream; opacity: 0; will-change: opacity;
}
.gb__crack--a { transform: translate(-50%, -50%) rotate(24deg); }
.gb__crack--b { transform: translate(-50%, -50%) rotate(-28deg); }

.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-4; }
  .gb__track { height: 18px; }
  .gb__value { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .gb__crack { display: none; }
}

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: 260px;
  background: #fff7e6;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  box-sizing: border-box;
}

.gb__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  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__value {
  font-size: 15px;
  font-weight: 700;
  color: #17141a;
}

.gb__track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  height: 22px;
}

.gb__pip {
  position: relative;
  border-radius: 4px;
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.gb__pipFill {
  position: absolute;
  inset: 0;
  background: #0a4fe8;
  opacity: 1;
  will-change: opacity;
}

.gb__crack {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 2px;
  height: 70%;
  background: #fff7e6;
  opacity: 0;
  will-change: opacity;
}

.gb__crack--a {
  transform: translate(-50%, -50%) rotate(24deg);
}

.gb__crack--b {
  transform: translate(-50%, -50%) rotate(-28deg);
}

.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: 16px;
  }
  .gb__track {
    height: 18px;
  }
  .gb__value {
    font-size: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .gb__crack {
    display: none;
  }
}

(function () {
  var PIPS = 5; // 계산 겹 상수: 칸 개수
  var EVENT_T = [400, 1300, 2200, 3100]; // ms, 자동 루프 안에서 칸이 깨지는 시각(PIPS-1 개)
  var CRACK_DUR = 520; // ms, 한 칸이 다 깨지는 데 걸리는 시간
  var STAGGER = 150; // ms, 균열 두 줄 사이 지연 — 칸 단위 stagger
  var PAUSE = 500;
  var CYCLE = EVENT_T[EVENT_T.length - 1] + CRACK_DUR + PAUSE;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var gb = document.getElementById('gb');
  var track = document.getElementById('gbTrack');
  var valueEl = document.getElementById('gbValue');
  var breakBtn = document.getElementById('gbBreak');

  var pips = [];
  for (var i = 0; i < PIPS; i++) {
    var pip = document.createElement('div');
    pip.className = 'gb__pip';
    var fillEl = document.createElement('div');
    fillEl.className = 'gb__pipFill';
    var c1 = document.createElement('div');
    c1.className = 'gb__crack gb__crack--a';
    var c2 = document.createElement('div');
    c2.className = 'gb__crack gb__crack--b';
    pip.appendChild(fillEl);
    pip.appendChild(c1);
    pip.appendChild(c2);
    track.appendChild(pip);
    pips.push({ el: pip, fill: fillEl, c1: c1, c2: c2 });
  }

  var isDemo = true;
  var appliedIdx = 0; // 몇 칸이 깨지는 이벤트를 지났는가 (0..PIPS-1)
  var eventTs = []; // 실제 깨진 시각 기록(자동·수동 공용)
  var cycleStart = 0;

  // 칸 pipIdx 는 오른쪽부터 먼저 깨진다: eventIndex = PIPS-1-pipIdx
  function stateFor(pipIdx, ts) {
    var eventIndex = PIPS - 1 - pipIdx;
    if (eventIndex < 0 || eventIndex >= appliedIdx) {
      return { c1: 0, c2: 0, fill: 1 };
    }
    var t0 = eventTs[eventIndex];
    var dt = Math.max(0, ts - t0);
    var c1 = Math.min(1, dt / (CRACK_DUR * 0.45));
    var c2 = Math.min(1, Math.max(0, dt - STAGGER) / (CRACK_DUR * 0.45));
    var fill = 1 - Math.min(1, Math.max(0, dt - STAGGER) / (CRACK_DUR - STAGGER));
    return { c1: c1, c2: c2, fill: fill };
  }

  function render(ts) {
    for (var i = 0; i < PIPS; i++) {
      var s = stateFor(i, ts);
      pips[i].fill.style.opacity = s.fill.toFixed(3);
      pips[i].c1.style.opacity = s.c1.toFixed(3);
      pips[i].c2.style.opacity = s.c2.toFixed(3);
    }
    var remaining = PIPS - appliedIdx;
    valueEl.textContent = remaining + ' / ' + PIPS;
    track.setAttribute('aria-valuenow', String(remaining));
  }

  function breakOne(ts) {
    eventTs[appliedIdx] = ts;
    appliedIdx++;
  }

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

  breakBtn.addEventListener('click', function () {
    human();
    var now = performance.now();
    if (appliedIdx >= PIPS - 1) { appliedIdx = 0; eventTs = []; }
    else { breakOne(now); }
    render(now);
  });
  breakBtn.addEventListener('keydown', function (ev) {
    if (ev.key !== 'Enter' && ev.key !== ' ') return;
    ev.preventDefault();
    breakBtn.click();
  });

  function loop(ts) {
    if (!cycleStart) cycleStart = ts;
    var elapsed = ts - cycleStart;

    if (isDemo) {
      if (elapsed >= CYCLE) {
        cycleStart = ts; elapsed = 0; appliedIdx = 0; eventTs = [];
      }
      for (var i = 0; i < EVENT_T.length; i++) {
        if (elapsed >= EVENT_T[i] && appliedIdx <= i) {
          eventTs[i] = cycleStart + EVENT_T[i];
          appliedIdx = i + 1;
        }
      }
    }

    render(ts);
    requestAnimationFrame(loop);
  }

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

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

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

const PIPS = 5; // 계산 겹 상수: 칸 개수
const EVENT_T = [400, 1300, 2200, 3100]; // ms, 자동 루프 안에서 칸이 깨지는 시각(PIPS-1 개)
const CRACK_DUR = 520; // ms, 한 칸이 다 깨지는 데 걸리는 시간
const STAGGER = 150; // ms, 균열 두 줄 사이 지연 — 칸 단위 stagger
const PAUSE = 500;
const CYCLE = EVENT_T[EVENT_T.length - 1] + CRACK_DUR + PAUSE;

type PipState = { c1: number; c2: number; fill: number };

export default function GaugeBarSegmentPipCrack() {
  const pipRefs = useRef(
    Array.from({ length: PIPS }, () => ({ fill: null, c1: null, c2: null }))
  ) as unknown as Box<{ fill: HTMLDivElement | null; c1: HTMLDivElement | null; c2: HTMLDivElement | null }[]>;
  const trackRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const isDemoRef = useRef(true) as unknown as Box<boolean>;
  const [isDemo, setIsDemo] = useState(true);
  const [remaining, setRemaining] = useState(PIPS);

  const appliedIdxRef = useRef(0) as unknown as Box<number>;
  const eventTsRef = useRef<number[]>([]) as unknown as Box<number[]>;

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

  // 칸 pipIdx 는 오른쪽부터 먼저 깨진다: eventIndex = PIPS-1-pipIdx
  function stateFor(pipIdx: number, ts: number): PipState {
    const eventIndex = PIPS - 1 - pipIdx;
    if (eventIndex < 0 || eventIndex >= appliedIdxRef.current) {
      return { c1: 0, c2: 0, fill: 1 };
    }
    const t0 = eventTsRef.current[eventIndex];
    const dt = Math.max(0, ts - t0);
    const c1 = Math.min(1, dt / (CRACK_DUR * 0.45));
    const c2 = Math.min(1, Math.max(0, dt - STAGGER) / (CRACK_DUR * 0.45));
    const fill = 1 - Math.min(1, Math.max(0, dt - STAGGER) / (CRACK_DUR - STAGGER));
    return { c1, c2, fill };
  }

  function render(ts: number) {
    for (let i = 0; i < PIPS; i++) {
      const s = stateFor(i, ts);
      const r = pipRefs.current[i];
      if (r.fill) r.fill.style.opacity = s.fill.toFixed(3);
      if (r.c1) r.c1.style.opacity = s.c1.toFixed(3);
      if (r.c2) r.c2.style.opacity = s.c2.toFixed(3);
    }
    const rem = PIPS - appliedIdxRef.current;
    const track = trackRef.current;
    if (track) track.setAttribute('aria-valuenow', String(rem));
    setRemaining(rem);
  }

  function breakOne(ts: number) {
    eventTsRef.current[appliedIdxRef.current] = ts;
    appliedIdxRef.current++;
  }

  useEffect(() => {
    const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
    let cycleStart = 0;
    let rafId = 0;

    function loop(ts: number) {
      if (!cycleStart) cycleStart = ts;
      let elapsed = ts - cycleStart;

      if (isDemoRef.current) {
        if (elapsed >= CYCLE) {
          cycleStart = ts; elapsed = 0; appliedIdxRef.current = 0; eventTsRef.current = [];
        }
        for (let i = 0; i < EVENT_T.length; i++) {
          if (elapsed >= EVENT_T[i] && appliedIdxRef.current <= i) {
            eventTsRef.current[i] = cycleStart + EVENT_T[i];
            appliedIdxRef.current = i + 1;
          }
        }
      }

      render(ts);
      rafId = requestAnimationFrame(loop);
    }

    if (!reduce) {
      rafId = requestAnimationFrame(loop);
    } else {
      render(0);
    }
    return () => cancelAnimationFrame(rafId);
  }, []);

  function onBreak() {
    human();
    const now = performance.now();
    if (appliedIdxRef.current >= PIPS - 1) { appliedIdxRef.current = 0; eventTsRef.current = []; }
    else { breakOne(now); }
    render(now);
  }

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

  return (
    <div className={`${styles.gb} ${isDemo ? styles.isDemo : ''}`}>
      <div className={styles.gbHead}>
        <span className={styles.gbLabel}>보스 체력</span>
        <span className={styles.gbValue}>{remaining} / {PIPS}</span>
      </div>
      <div
        className={styles.gbTrack}
        role="progressbar"
        aria-label="보스 체력"
        aria-valuemin={0}
        aria-valuemax={PIPS}
        aria-valuenow={remaining}
        ref={trackRef}
      >
        {Array.from({ length: PIPS }, (_, i) => (
          <div className={styles.gbPip} key={i}>
            <div
              className={styles.gbPipFill}
              ref={(el: HTMLDivElement | null) => { pipRefs.current[i].fill = el; }}
            />
            <div
              className={`${styles.gbCrack} ${styles.gbCrackA}`}
              ref={(el: HTMLDivElement | null) => { pipRefs.current[i].c1 = el; }}
            />
            <div
              className={`${styles.gbCrack} ${styles.gbCrackB}`}
              ref={(el: HTMLDivElement | null) => { pipRefs.current[i].c2 = el; }}
            />
          </div>
        ))}
      </div>
      <button type="button" className={styles.gbHit} onClick={onBreak} onKeyDown={onKeyDown}>
        칸 깨기
      </button>
    </div>
  );
}