09The hero scene — day-night lighting and parallax turning together

<main class="stage">
<div class="dn" id="dn">
  <p class="dn__hint">The pointer's vertical position sets the day-night progress (t) — sky and windows interpolate by t every frame, while sun→moon swaps via a transition</p>
  <div class="dn__field" role="application" tabindex="0" aria-label="Scene where moving the pointer up and down turns an isometric town from day to night" id="field">
    <div class="dn__sky" id="sky">
      <div class="dn__orb dn__orb--sun" id="sun"></div>
      <div class="dn__orb dn__orb--moon" id="moon"></div>
    </div>
    <div class="dn__world" id="world"></div>
  </div>
  <p class="dn__meta">Night progress  <b id="pct">0</b>%</p>
</div>
</main>

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

// 낮밤 히어로(09) — 무대는 먹. 하늘색·창문 밝기는 JS 가 낮밤 진행도(t)로 매 프레임 직접
// 보간해 칠한다(transition 없이 매끄럽다). 해→달 교체만 t=0.5 문턱에서 is-night 클래스로
// 진짜 opacity transition 크로스페이드를 튼다.

$duration: $dur-base;
$easing: $ease-out;
$color: $subject-blue-light;

@include stage($stage-ink);

.dn {
  display: flex; flex-direction: column; align-items: center; gap: $sp-2;
  width: 100%; max-width: 420px;
}

.dn__hint {
  margin: 0; font-weight: 700; font-size: clamp(10px, 2.6vw, 12px); line-height: 1.35;
  color: $subject-cream; text-align: center;
}

.dn__field {
  position: relative;
  width: clamp(180px, 42vw, 220px); height: clamp(140px, 34vw, 168px);
  display: grid; place-items: center;
  border-radius: $r-sm;
  overflow: hidden;
  outline: none;
}
.dn__field:focus-visible { box-shadow: inset 0 0 0 2px rgba($subject-cream, .6); }

.dn__sky {
  position: absolute; inset: 0;
  background-color: $subject-blue-light;
  border-radius: $r-sm;
}

.dn__orb {
  position: absolute; left: 50%; top: 50%;
  width: 16px; height: 16px; border-radius: $r-pill;
  margin-left: -8px; margin-top: -8px;
  transition: opacity $duration $easing;
}
.dn__orb--sun { background: $stage-yellow; box-shadow: 0 0 10px rgba($stage-yellow, .8); opacity: 1; }
.dn__orb--moon { background: $subject-cream; box-shadow: 0 0 8px rgba($subject-cream, .7); opacity: 0; }
.dn__field.is-night .dn__orb--sun { opacity: 0; }
.dn__field.is-night .dn__orb--moon { opacity: 1; }

.dn__world { position: relative; transform-style: preserve-3d; width: 1px; height: 1px; }

.dn__bld {
  position: absolute; left: 0; top: 0;
  width: 34px; height: 34px;
  transform: translate3d(var(--tx), var(--ty), 0) translate(-50%, -50%);
  background: $subject-ink;
  border: 1px solid rgba($subject-cream, .2);
  border-radius: $r-xs;
  box-shadow: $shadow-press;
}

.dn__win {
  position: absolute; left: 50%; top: 50%;
  width: 6px; height: 6px;
  transform: translate(-50%, -50%);
  background: $stage-yellow;
  border-radius: $r-xs;
}

.dn__meta { margin: 0; font-size: clamp(9px, 2.4vw, 11px); color: rgba($subject-cream, .82); }
.dn__meta b { font-weight: 800; color: $stage-yellow; font-variant-numeric: tabular-nums; }

@media (max-width: 340px) {
  .dn { gap: $sp-1; }
  .dn__field { width: 156px; height: 112px; }
  .dn__hint { font-size: 8px; }
  .dn__meta { font-size: 7px; }
}

// reduce — 포인터 추적·자동 순환이 멎는다. 0.6(밤 쪽) 진행도로 고정된 정지 장면만 남긴다.
@media (prefers-reduced-motion: reduce) {
  .dn.is-still .dn__orb { transition: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.dn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: 420px;
}

.dn__hint {
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.6vw, 12px);
  line-height: 1.35;
  color: #fff7e6;
  text-align: center;
}

.dn__field {
  position: relative;
  width: clamp(180px, 42vw, 220px);
  height: clamp(140px, 34vw, 168px);
  display: grid;
  place-items: center;
  border-radius: 8px;
  overflow: hidden;
  outline: none;
}

.dn__field:focus-visible {
  box-shadow: inset 0 0 0 2px rgba(255, 247, 230, 0.6);
}

.dn__sky {
  position: absolute;
  inset: 0;
  background-color: #5b8cf8;
  border-radius: 8px;
}

.dn__orb {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  margin-left: -8px;
  margin-top: -8px;
  transition: opacity 300ms ease-out;
}

.dn__orb--sun {
  background: #ffd23f;
  box-shadow: 0 0 10px rgba(255, 210, 63, 0.8);
  opacity: 1;
}

.dn__orb--moon {
  background: #fff7e6;
  box-shadow: 0 0 8px rgba(255, 247, 230, 0.7);
  opacity: 0;
}

.dn__field.is-night .dn__orb--sun {
  opacity: 0;
}

.dn__field.is-night .dn__orb--moon {
  opacity: 1;
}

.dn__world {
  position: relative;
  transform-style: preserve-3d;
  width: 1px;
  height: 1px;
}

.dn__bld {
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 34px;
  transform: translate3d(var(--tx), var(--ty), 0) translate(-50%, -50%);
  background: #17141a;
  border: 1px solid rgba(255, 247, 230, 0.2);
  border-radius: 4px;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.dn__win {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 6px;
  height: 6px;
  transform: translate(-50%, -50%);
  background: #ffd23f;
  border-radius: 4px;
}

.dn__meta {
  margin: 0;
  font-size: clamp(9px, 2.4vw, 11px);
  color: rgba(255, 247, 230, 0.82);
}

.dn__meta b {
  font-weight: 800;
  color: #ffd23f;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .dn {
    gap: 4px;
  }
  .dn__field {
    width: 156px;
    height: 112px;
  }
  .dn__hint {
    font-size: 8px;
  }
  .dn__meta {
    font-size: 7px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .dn.is-still .dn__orb {
    transition: none;
  }
}

// 낮밤 히어로(09) — 포인터 세로 위치 → 낮밤 진행도 t(0~1). 하늘색·창문 밝기는 t 로
// 매 프레임 직접 보간(JS lerp, transition 없이 매끄럽다). 해↔달 교체만 t=0.5 문턱에서
// 클래스를 토글해 진짜 CSS transition(opacity)으로 크로스페이드한다. 입력이 없으면
// requestAnimationFrame 루프가 자체 경로로 낮밤을 순환시킨다(자동 시연).
(function () {
  var root = document.getElementById('dn');
  var field = document.getElementById('field');
  var sky = document.getElementById('sky');
  var world = document.getElementById('world');
  var sun = document.getElementById('sun');
  var moon = document.getElementById('moon');
  var pctEl = document.getElementById('pct');
  if (!root || !field || !sky || !world || !sun || !moon || !pctEl) return;

  function clamp(v, lo, hi) { return v < lo ? lo : (v > hi ? hi : v); }
  function lerp(a, b, t) { return a + (b - a) * t; }

  function mat4RotateX(deg) {
    var r = deg * Math.PI / 180, c = Math.cos(r), s = Math.sin(r);
    return [1, 0, 0, 0, 0, c, s, 0, 0, -s, c, 0, 0, 0, 0, 1];
  }
  function mat4RotateZ(deg) {
    var r = deg * Math.PI / 180, c = Math.cos(r), s = Math.sin(r);
    return [c, s, 0, 0, -s, c, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
  }
  function mat4Mul(a, b) {
    var out = new Array(16);
    for (var col = 0; col < 4; col++) {
      for (var row = 0; row < 4; row++) {
        var sum = 0;
        for (var k = 0; k < 4; k++) sum += a[k * 4 + row] * b[col * 4 + k];
        out[col * 4 + row] = sum;
      }
    }
    return out;
  }
  function mat4ToCss(m) {
    var s = '';
    for (var i = 0; i < m.length; i++) s += (i ? ',' : '') + m[i].toFixed(6);
    return 'matrix3d(' + s + ')';
  }

  world.style.transform = mat4ToCss(mat4Mul(mat4RotateX(-35.264), mat4RotateZ(45)));

  var mm = window.matchMedia('(max-width: 340px)').matches;
  var N = 2;
  var TILE_W = mm ? 32 : 40, TILE_H = mm ? 16 : 20;
  var wins = [];
  for (var row = 0; row < N; row++) {
    for (var col = 0; col < N; col++) {
      var x = (col - row) * TILE_W / 2;
      var y = (col + row) * TILE_H / 2;
      var bld = document.createElement('div');
      bld.className = 'dn__bld';
      bld.style.setProperty('--tx', x.toFixed(2) + 'px');
      bld.style.setProperty('--ty', y.toFixed(2) + 'px');
      bld.style.zIndex = String(Math.round((col + row) * 10));
      var win = document.createElement('div');
      win.className = 'dn__win';
      bld.appendChild(win);
      world.appendChild(bld);
      wins.push(win);
    }
  }

  // 낮 하늘색 → 밤 하늘색 (RGB 보간, day.length === night.length)
  var DAY = [91, 140, 248];     // $subject-blue-light 근사
  var NIGHT = [23, 20, 26];     // $stage-ink

  var targetT = 0, curT = 0;
  var lastInput = -Infinity;
  var IDLE_MS = 1100;

  field.addEventListener('pointermove', function (ev) {
    var rect = field.getBoundingClientRect();
    var ny = (ev.clientY - rect.top) / rect.height;
    targetT = clamp(ny, 0, 1);
    lastInput = performance.now();
  });
  field.addEventListener('pointerleave', function () { lastInput = -Infinity; });

  var wasNight = false;

  function paint(now, t) {
    if (now - lastInput > IDLE_MS) targetT = (1 - Math.cos(t * 3)) / 2;
    curT += (targetT - curT) * 0.14;

    var r = Math.round(lerp(DAY[0], NIGHT[0], curT));
    var g = Math.round(lerp(DAY[1], NIGHT[1], curT));
    var b = Math.round(lerp(DAY[2], NIGHT[2], curT));
    sky.style.backgroundColor = 'rgb(' + r + ',' + g + ',' + b + ')';

    for (var i = 0; i < wins.length; i++) {
      wins[i].style.opacity = String((0.15 + curT * 0.85).toFixed(2));
    }

    var isNight = curT > 0.5;
    if (isNight !== wasNight) {
      field.classList.toggle('is-night', isNight);
      wasNight = isNight;
    }

    var orbY = mm ? 60 : 76;
    var ox = (curT - 0.5) * (mm ? 120 : 150);
    var oy = -Math.cos(curT * Math.PI) * orbY;
    sun.style.transform = 'translate3d(' + ox.toFixed(1) + 'px,' + oy.toFixed(1) + 'px,0)';
    moon.style.transform = 'translate3d(' + ox.toFixed(1) + 'px,' + oy.toFixed(1) + 'px,0)';

    pctEl.textContent = String(Math.round(curT * 100));
  }

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (reduce) {
    targetT = 0.6; curT = 0.6;
    paint(0, 0.3);
    root.classList.add('is-still');
  } else {
    var start = performance.now();
    (function step(now) {
      paint(now, (now - start) / 1000);
      requestAnimationFrame(step);
    })(start);
  }
})();

// IsometricHeroDayNight — vanilla 판(run/333/demo/09-isometric-hero-day-night/index.html)
// 의 React 포트. 포인터 세로 위치가 낮밤 진행도(t)를 정한다 — 하늘·창문 색은 t 로 매
// 프레임 RGB 보간하고, 해→달은 t>0.5 에서 클래스 토글로 한 프레임에 컷 교체한다.
import { useEffect, useRef } from "react";
import styles from "./IsometricHeroDayNight.module.scss";

export type IsometricHeroDayNightProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

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

const HINT = "포인터 세로 위치가 낮밤 진행도(t)를 정합니다 — 하늘·창문은 t 로 매 프레임 보간, 해→달은 transition 으로 교체됩니다";
const ARIA_FIELD = "포인터를 위아래로 움직이면 등각 마을이 낮에서 밤으로 바뀌는 장면";
const LABEL_NIGHT = "밤 진행도 ";

const SKY_DAY = [110, 200, 255];
const SKY_NIGHT = [23, 20, 26];

function lerp(a: number, b: number, t: number): number {
  return a + (b - a) * t;
}
function mixRgb(a: number[], b: number[], t: number): string {
  return (
    "rgb(" +
    Math.round(lerp(a[0], b[0], t)) +
    "," +
    Math.round(lerp(a[1], b[1], t)) +
    "," +
    Math.round(lerp(a[2], b[2], t)) +
    ")"
  );
}

export default function IsometricHeroDayNight({
  duration = "600ms",
  easing = "ease-out",
  color = "#5b8cf8"
}: IsometricHeroDayNightProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const skyRef = useRef<HTMLDivElement | null>(null);
  const nightPctRef = useRef<HTMLElement | null>(null);
  const stateRef = useRef({ targetT: 0.2, curT: 0.2 }) as Box<{ targetT: number; curT: number }>;
  const rafRef = useRef(0) as Box<number>;

  useEffect(() => {
    const field = fieldRef.current;
    const sky = skyRef.current;
    const root = rootRef.current;
    if (!field || !sky || !root) return;

    function onMove(e: PointerEvent): void {
      if (!field) return;
      const rect = field.getBoundingClientRect();
      const ny = (e.clientY - rect.top) / rect.height;
      stateRef.current.targetT = ny < 0 ? 0 : ny > 1 ? 1 : ny;
    }
    field.addEventListener("pointermove", onMove);

    function paint(): void {
      const s = stateRef.current;
      s.curT += (s.targetT - s.curT) * 0.12;
      sky!.style.background = mixRgb(SKY_DAY, SKY_NIGHT, s.curT);
      const isNight = s.curT > 0.5;
      field!.classList.toggle(styles.isNight, isNight);
      if (nightPctRef.current) nightPctRef.current.textContent = String(Math.round(s.curT * 100));
    }

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (reduce) {
      stateRef.current.curT = 0.5;
      stateRef.current.targetT = 0.5;
      paint();
      root.classList.add(styles.isStill);
    } else {
      const step = (): void => {
        paint();
        rafRef.current = requestAnimationFrame(step);
      };
      rafRef.current = requestAnimationFrame(step);
    }
    return () => {
      cancelAnimationFrame(rafRef.current);
      field.removeEventListener("pointermove", onMove);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.hn} ref={rootRef} data-duration={duration} data-easing={easing} data-color={color}>
        <p className={styles.hint}>{HINT}</p>
        <div className={styles.field} ref={fieldRef} role="img" aria-label={ARIA_FIELD} tabIndex={0}>
          <div className={styles.sky} ref={skyRef}></div>
          <div className={styles.sun}></div>
          <div className={styles.moon}></div>
          <div className={styles.town}>
            <div className={styles.house}></div>
            <div className={styles.house}></div>
            <div className={styles.house}></div>
          </div>
        </div>
        <p className={styles.meta}>
          <span className={styles.metaLabel}>{LABEL_NIGHT}</span>
          <b className={styles.nightVal} ref={nightPctRef}>20</b>%
        </p>
      </div>
    </main>
  );
}