06座標の値が2つの表記を行き来する同期インプット

<main class="stage">
<div class="gc is-demo" id="gc">
  <div class="gc__fields">
    <div class="gc__field">
      <span class="gc__cap">度・分・秒</span>
      <div class="gc__dms">
        <input class="gc__deg" id="gcDeg" type="number" step="1" min="-90" max="90" value="37" aria-label="度の値を入力すると分・秒と一緒に十進数座標を計算し、目盛りの位置を動かします" aria-describedby="gcReadout">
        <span aria-hidden="true">°</span>
        <input class="gc__min" id="gcMin" type="number" step="1" min="0" max="59" value="33" aria-label="分の値を入力すると度・秒と一緒に十進数座標を計算し、目盛りの位置を動かします" aria-describedby="gcReadout">
        <span aria-hidden="true">'</span>
        <input class="gc__sec" id="gcSec" type="number" step="0.1" min="0" max="59.9" value="12.0" aria-label="秒の値を入力すると度・分と一緒に十進数座標を計算し、目盛りの位置を動かします" aria-describedby="gcReadout">
        <span aria-hidden="true">"</span>
      </div>
    </div>
    <div class="gc__field">
      <span class="gc__cap">十進数</span>
      <input class="gc__dec" id="gcDec" type="number" step="0.0001" min="-90" max="90" value="37.5533" aria-label="十進数座標の値を入力すると度・分・秒も一緒に計算し、目盛りの位置を動かします" aria-describedby="gcReadout">
    </div>
  </div>
  <div class="gc__scale" aria-hidden="true">
    <div class="gc__track"></div>
    <div class="gc__marker" id="gcMarker"></div>
  </div>
  <p class="gc__readout" id="gcReadout" role="status" aria-live="polite"></p>
</div>
</main>

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

// 계산 겹(도분초<->십진수 상호변환, 눈금 위치 산출)은 index.html 의 dmsToDecimal()/decimalToDms() 에 있다. 여기는 무대·레이아웃만.
$duration: $dur-loop;
$easing:   $ease-spring;
$color:    $subject-cream;

@include stage($stage-yellow);

.gc {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: $sp-2;
  width: min(260px, 88vw);
  background: $subject-ink;
  border-radius: $r-card;
  padding: $sp-4;
  box-shadow: $shadow-raised;
}

.gc__fields {
  display: flex;
  gap: $sp-3;
  width: 100%;
}

.gc__field {
  display: flex;
  flex-direction: column;
  gap: $sp-1;
}

.gc__field:first-child {
  flex: 1 1 auto;
}

.gc__field:last-child {
  flex: 0 0 auto;
}

.gc__cap {
  color: $color;
  font-size: 11px;
  font-weight: 500;
}

.gc__dms {
  display: flex;
  align-items: center;
  gap: $sp-1;
  color: $color;
  font-size: 11px;
}

.gc__deg,
.gc__min,
.gc__sec {
  width: 34px;
  border: 0;
  border-radius: $r-control;
  padding: $sp-1;
  background: $subject-cream;
  color: $subject-ink;
  font-weight: 700;
  font-size: 12px;
  text-align: center;
}

.gc__dec {
  width: 76px;
  border: 0;
  border-radius: $r-control;
  padding: $sp-1 $sp-2;
  background: $subject-cream;
  color: $subject-ink;
  font-weight: 700;
  font-size: 12px;
  text-align: center;
}

.gc__deg:focus-visible,
.gc__min:focus-visible,
.gc__sec:focus-visible,
.gc__dec:focus-visible {
  outline: 2px solid $color;
  outline-offset: 2px;
}

.gc__scale {
  position: relative;
  height: 16px;
  border-radius: $r-pill;
}

.gc__track {
  position: absolute;
  inset: 0;
  border-radius: $r-pill;
  background: rgba($subject-cream, .16);
}

.gc__marker {
  position: absolute;
  top: 50%;
  left: 0;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  border-radius: 50%;
  background: $subject-blue;
  box-shadow: $shadow-press;
  transition: box-shadow $duration $easing;
  will-change: transform;
}

.gc__readout {
  margin: 0;
  color: $color;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
  text-align: center;
}

@media (max-width: 340px) {
  .gc { padding: $sp-3; gap: $sp-1; width: min(230px, 88vw); }
  .gc__fields { gap: $sp-2; }
  .gc__cap { font-size: 10px; }
  .gc__deg, .gc__min, .gc__sec { width: 28px; font-size: 11px; }
  .gc__dec { width: 64px; font-size: 11px; }
  .gc__scale { height: 14px; }
  .gc__marker { width: 10px; height: 10px; margin-top: -5px; }
  .gc__readout { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .gc__marker { transition: 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);
}

.gc {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  width: min(260px, 88vw);
  background: #17141a;
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.gc__fields {
  display: flex;
  gap: 12px;
  width: 100%;
}

.gc__field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gc__field:first-child {
  flex: 1 1 auto;
}

.gc__field:last-child {
  flex: 0 0 auto;
}

.gc__cap {
  color: #fff7e6;
  font-size: 11px;
  font-weight: 500;
}

.gc__dms {
  display: flex;
  align-items: center;
  gap: 4px;
  color: #fff7e6;
  font-size: 11px;
}

.gc__deg,
.gc__min,
.gc__sec {
  width: 34px;
  border: 0;
  border-radius: 12px;
  padding: 4px;
  background: #fff7e6;
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  text-align: center;
}

.gc__dec {
  width: 76px;
  border: 0;
  border-radius: 12px;
  padding: 4px 8px;
  background: #fff7e6;
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  text-align: center;
}

.gc__deg:focus-visible,
.gc__min:focus-visible,
.gc__sec:focus-visible,
.gc__dec:focus-visible {
  outline: 2px solid #fff7e6;
  outline-offset: 2px;
}

.gc__scale {
  position: relative;
  height: 16px;
  border-radius: 999px;
}

.gc__track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.16);
}

.gc__marker {
  position: absolute;
  top: 50%;
  left: 0;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  border-radius: 50%;
  background: #2f6df6;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transition: box-shadow 2s cubic-bezier(0.2, 0.8, 0.2, 1);
  will-change: transform;
}

.gc__readout {
  margin: 0;
  color: #fff7e6;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.3;
  text-align: center;
}

@media (max-width: 340px) {
  .gc {
    padding: 12px;
    gap: 4px;
    width: min(230px, 88vw);
  }
  .gc__fields {
    gap: 8px;
  }
  .gc__cap {
    font-size: 10px;
  }
  .gc__deg, .gc__min, .gc__sec {
    width: 28px;
    font-size: 11px;
  }
  .gc__dec {
    width: 64px;
    font-size: 11px;
  }
  .gc__scale {
    height: 14px;
  }
  .gc__marker {
    width: 10px;
    height: 10px;
    margin-top: -5px;
  }
  .gc__readout {
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .gc__marker {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('gc');
  var degInput = document.getElementById('gcDeg');
  var minInput = document.getElementById('gcMin');
  var secInput = document.getElementById('gcSec');
  var decInput = document.getElementById('gcDec');
  var marker = document.getElementById('gcMarker');
  var track = marker.parentElement;
  var readout = document.getElementById('gcReadout');
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var isDemo = true;

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

  var RANGE = 90;
  // 계산 한 겹 — 度分秒<-> 十進数 상호 변환, 눈금 위 위치(0~1)
  function dmsToDecimal(deg, min, sec) {
    var sign = deg < 0 ? -1 : 1;
    return sign * (Math.abs(deg) + min / 60 + sec / 3600);
  }
  function decimalToDms(dec) {
    var sign = dec < 0 ? -1 : 1;
    var abs = Math.abs(dec);
    var deg = Math.floor(abs);
    var minFull = (abs - deg) * 60;
    var min = Math.floor(minFull);
    var sec = (minFull - min) * 60;
    return { deg: sign * deg, min: min, sec: sec };
  }
  function clamp01(v) { return v < 0 ? 0 : v > 1 ? 1 : v; }

  var SENT_PREFIX = '度分秒', SENT_MID = 'は十進数で', SENT_SUFFIX = '度です。';

  var targetX = 0, renderedX = 0;
  var LERP_RATE = 0.15;

  function paintCommon(dec) {
    targetX = clamp01((dec + RANGE) / (RANGE * 2));
    if (reduce) { renderedX = targetX; paint(); }
  }

  function readSentence(deg, min, sec, dec) {
    readout.textContent = SENT_PREFIX + deg + '°' + min + "'" + sec.toFixed(1) + '"' + SENT_MID + dec.toFixed(4) + SENT_SUFFIX;
  }

  function applyFromDms() {
    var deg = parseFloat(degInput.value); if (isNaN(deg)) deg = 0;
    var min = parseFloat(minInput.value); if (isNaN(min)) min = 0;
    var sec = parseFloat(secInput.value); if (isNaN(sec)) sec = 0;
    var dec = dmsToDecimal(deg, min, sec);
    decInput.value = dec.toFixed(4);
    readSentence(deg, min, sec, dec);
    paintCommon(dec);
  }

  function applyFromDecimal() {
    var dec = parseFloat(decInput.value); if (isNaN(dec)) dec = 0;
    var dms = decimalToDms(dec);
    degInput.value = dms.deg;
    minInput.value = dms.min;
    secInput.value = dms.sec.toFixed(1);
    readSentence(dms.deg, dms.min, dms.sec, dec);
    paintCommon(dec);
  }

  function paint() {
    var trackW = track.clientWidth - marker.offsetWidth;
    var x = renderedX * trackW;
    marker.style.transform = 'translateX(' + x.toFixed(1) + 'px)';
  }

  function onDmsInput() { human(); applyFromDms(); }
  function onDecInput() { human(); applyFromDecimal(); }
  degInput.addEventListener('input', onDmsInput);
  degInput.addEventListener('change', onDmsInput);
  minInput.addEventListener('input', onDmsInput);
  minInput.addEventListener('change', onDmsInput);
  secInput.addEventListener('input', onDmsInput);
  secInput.addEventListener('change', onDmsInput);
  decInput.addEventListener('input', onDecInput);
  decInput.addEventListener('change', onDecInput);

  var DEMO_VALUES = [12.5, 45.75, -8.333, 63.104, -51.9, 29.7801];
  var DRIVE_PERIOD_MS = 2000;
  var driveStart = 0, lastIdx = -1;
  function driveTick(now) {
    if (!driveStart) driveStart = now;
    if (isDemo) {
      var frac = ((now - driveStart) % DRIVE_PERIOD_MS) / DRIVE_PERIOD_MS;
      var idx = Math.floor(frac * DEMO_VALUES.length);
      if (idx !== lastIdx) {
        lastIdx = idx;
        decInput.value = DEMO_VALUES[idx];
        applyFromDecimal();
      }
    }
    requestAnimationFrame(driveTick);
  }

  function frame() {
    renderedX += (targetX - renderedX) * LERP_RATE;
    paint();
    requestAnimationFrame(frame);
  }

  window.addEventListener('resize', paint);
  applyFromDecimal();

  if (!reduce) {
    requestAnimationFrame(driveTick);
    requestAnimationFrame(frame);
  }
})();

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

export default function GeoCoordSync() {
  const rootRef = useRef<HTMLDivElement | null>(null);
  const degRef = useRef<HTMLInputElement | null>(null);
  const minRef = useRef<HTMLInputElement | null>(null);
  const secRef = useRef<HTMLInputElement | null>(null);
  const decRef = useRef<HTMLInputElement | null>(null);
  const markerRef = useRef<HTMLDivElement | null>(null);
  const readoutRef = useRef<HTMLParagraphElement | null>(null);

  useEffect(() => {
    const root = rootRef.current;
    const degInput = degRef.current;
    const minInput = minRef.current;
    const secInput = secRef.current;
    const decInput = decRef.current;
    const marker = markerRef.current;
    const readout = readoutRef.current;
    if (!root || !degInput || !minInput || !secInput || !decInput || !marker || !readout) return;
    const track = marker.parentElement as HTMLDivElement;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    let isDemo = true;

    function human() {
      if (isDemo) {
        root!.classList.remove("is-demo");
        isDemo = false;
      }
    }

    const RANGE = 90;
    function dmsToDecimal(deg: number, min: number, sec: number) {
      const sign = deg < 0 ? -1 : 1;
      return sign * (Math.abs(deg) + min / 60 + sec / 3600);
    }
    function decimalToDms(dec: number) {
      const sign = dec < 0 ? -1 : 1;
      const abs = Math.abs(dec);
      const deg = Math.floor(abs);
      const minFull = (abs - deg) * 60;
      const min = Math.floor(minFull);
      const sec = (minFull - min) * 60;
      return { deg: sign * deg, min, sec };
    }
    function clamp01(v: number) {
      return v < 0 ? 0 : v > 1 ? 1 : v;
    }

    const SENT_PREFIX = "도분초 ";
    const SENT_MID = "는 십진수로 ";
    const SENT_SUFFIX = "도입니다";

    let targetX = 0;
    let renderedX = 0;
    const LERP_RATE = 0.15;

    function paintCommon(dec: number) {
      targetX = clamp01((dec + RANGE) / (RANGE * 2));
      if (reduce) {
        renderedX = targetX;
        paint();
      }
    }

    function readSentence(deg: number, min: number, sec: number, dec: number) {
      readout!.textContent =
        SENT_PREFIX + deg + "°" + min + "'" + sec.toFixed(1) + '"' + SENT_MID + dec.toFixed(4) + SENT_SUFFIX;
    }

    function applyFromDms() {
      let deg = parseFloat(degInput!.value); if (isNaN(deg)) deg = 0;
      let min = parseFloat(minInput!.value); if (isNaN(min)) min = 0;
      let sec = parseFloat(secInput!.value); if (isNaN(sec)) sec = 0;
      const dec = dmsToDecimal(deg, min, sec);
      decInput!.value = dec.toFixed(4);
      readSentence(deg, min, sec, dec);
      paintCommon(dec);
    }

    function applyFromDecimal() {
      let dec = parseFloat(decInput!.value); if (isNaN(dec)) dec = 0;
      const dms = decimalToDms(dec);
      degInput!.value = String(dms.deg);
      minInput!.value = String(dms.min);
      secInput!.value = dms.sec.toFixed(1);
      readSentence(dms.deg, dms.min, dms.sec, dec);
      paintCommon(dec);
    }

    function paint() {
      const trackW = track.clientWidth - marker!.offsetWidth;
      const x = renderedX * trackW;
      marker!.style.transform = "translateX(" + x.toFixed(1) + "px)";
    }

    function onDmsInput() {
      human();
      applyFromDms();
    }
    function onDecInput() {
      human();
      applyFromDecimal();
    }
    degInput.addEventListener("input", onDmsInput);
    degInput.addEventListener("change", onDmsInput);
    minInput.addEventListener("input", onDmsInput);
    minInput.addEventListener("change", onDmsInput);
    secInput.addEventListener("input", onDmsInput);
    secInput.addEventListener("change", onDmsInput);
    decInput.addEventListener("input", onDecInput);
    decInput.addEventListener("change", onDecInput);

    const DEMO_VALUES = [12.5, 45.75, -8.333, 63.104, -51.9, 29.7801];
    const DRIVE_PERIOD_MS = 2000;
    let driveStart = 0;
    let lastIdx = -1;
    let rafDrive = 0;
    function driveTick(now: number) {
      if (!driveStart) driveStart = now;
      if (isDemo) {
        const frac = ((now - driveStart) % DRIVE_PERIOD_MS) / DRIVE_PERIOD_MS;
        const idx = Math.floor(frac * DEMO_VALUES.length);
        if (idx !== lastIdx) {
          lastIdx = idx;
          decInput!.value = String(DEMO_VALUES[idx]);
          applyFromDecimal();
        }
      }
      rafDrive = requestAnimationFrame(driveTick);
    }

    let rafFrame = 0;
    function frame() {
      renderedX += (targetX - renderedX) * LERP_RATE;
      paint();
      rafFrame = requestAnimationFrame(frame);
    }

    window.addEventListener("resize", paint);
    applyFromDecimal();

    if (!reduce) {
      rafDrive = requestAnimationFrame(driveTick);
      rafFrame = requestAnimationFrame(frame);
    }

    return () => {
      degInput.removeEventListener("input", onDmsInput);
      degInput.removeEventListener("change", onDmsInput);
      minInput.removeEventListener("input", onDmsInput);
      minInput.removeEventListener("change", onDmsInput);
      secInput.removeEventListener("input", onDmsInput);
      secInput.removeEventListener("change", onDmsInput);
      decInput.removeEventListener("input", onDecInput);
      decInput.removeEventListener("change", onDecInput);
      window.removeEventListener("resize", paint);
      if (rafDrive) cancelAnimationFrame(rafDrive);
      if (rafFrame) cancelAnimationFrame(rafFrame);
    };
  }, []);

  return (
    <div ref={rootRef} className={`${styles.root} is-demo`}>
      <div className={styles.fields}>
        <div className={styles.field}>
          <span className={styles.cap}>도·분·초</span>
          <div className={styles.dms}>
            <input
              ref={degRef}
              className={styles.deg}
              type="number"
              step={1}
              min={-90}
              max={90}
              defaultValue={37}
              aria-label="도 값 — 분·초와 함께 십진수 좌표로 계산해 눈금 위치를 옮깁니다"
              aria-describedby="gcReadoutReact"
            />
            <span aria-hidden="true">°</span>
            <input
              ref={minRef}
              className={styles.min}
              type="number"
              step={1}
              min={0}
              max={59}
              defaultValue={33}
              aria-label="분 값 — 도·초와 함께 십진수 좌표로 계산해 눈금 위치를 옮깁니다"
              aria-describedby="gcReadoutReact"
            />
            <span aria-hidden="true">'</span>
            <input
              ref={secRef}
              className={styles.sec}
              type="number"
              step={0.1}
              min={0}
              max={59.9}
              defaultValue={12.0}
              aria-label="초 값 — 도·분과 함께 십진수 좌표로 계산해 눈금 위치를 옮깁니다"
              aria-describedby="gcReadoutReact"
            />
            <span aria-hidden="true">"</span>
          </div>
        </div>
        <div className={styles.field}>
          <span className={styles.cap}>십진수</span>
          <input
            ref={decRef}
            className={styles.dec}
            type="number"
            step={0.0001}
            min={-90}
            max={90}
            defaultValue={37.5533}
            aria-label="십진수 좌표 값을 입력하면 도·분·초로 함께 계산해 눈금 위치를 옮깁니다"
            aria-describedby="gcReadoutReact"
          />
        </div>
      </div>
      <div className={styles.scale} aria-hidden="true">
        <div className={styles.track} />
        <div ref={markerRef} className={styles.marker} />
      </div>
      <p ref={readoutRef} className={styles.readout} id="gcReadoutReact" role="status" aria-live="polite" />
    </div>
  );
}