/* ================= 首页头图：按孕周换宝宝 + 阳光水波（2026-10-04） ================= 用户：「宝宝按孕周换、孕囊跟着宝宝大小变；顶部往下落的花瓣去掉，换成阳光和水波纹」。 ① 换宝宝：孕周来自 app.js 的 mb-preg 事件（syncPregnancy 跑完广播，首屏一次、远程档案回来再一次）。 9 个阶段各一张「羊水囊 + 宝宝」整幅图：静图（首帧）先出，GIF 加载完再盖上淡入。 没建档 / 产后 / 事件迟迟不来 → 用第 6 阶段（原来那个 25 周的宝宝）。 孕囊大小 = .hero-baby 的 --k（相对原 25 周囊的倍数），CSS 里围绕同一圆心缩放、带过渡。 调试：URL 带 kidweek=12 强制按 12 周显示。 ② 阳光水波：#heroFx 一张画布，screen 混合叠在宝宝上、文字下。 光束从顶上打进来 + 水底焦散 + 悬浮微粒；羊水囊整体挂 SVG 位移滤镜做液体折射（详见下面那段）。 不在首页 / 页面隐藏 / 头图滚出视口时停画；系统「减少动态效果」下整块不画（CSS 也隐藏）。 */ (function () { 'use strict'; // [起始孕周, 静图, GIF, 孕囊倍数 k] const STAGES = [ [0, '6fff51c80fe6.jpg', '2ad895e978db.gif', .42], // 1 4–7 周 胚芽 + 卵黄囊 [8, 'a75f4970478c.jpg', '90bd965c9c20.gif', .52], // 2 8–10 周 小豆芽胚胎 [11, '42d00e242622.jpg', 'd7eda80e7d45.gif', .62], // 3 11–13 周 刚有人形 [14, '23302f9bfb42.jpg', 'f8252c0c0c22.gif', .72], // 4 14–17 周 身子拉长、吮手 [18, '7e6c3509097a.jpg', '993c4174c867.gif', .86], // 5 18–23 周 比例接近新生儿、偏瘦 [24, 'c0cbdd749ab0.jpg', '9c682de32bc3.gif', 1], // 6 24–27 周 原来那个宝宝 [28, 'bbaebc03aaf7.jpg', '01529c30ecc6.gif', 1.01], // 7 28–31 周 大一圈、有胎发 [32, '086e4e001a89.jpg', '11061c1c24c1.gif', 1.02], // 8 32–35 周 肉嘟嘟、抱腿 [36, '66b149335975.jpg', '291f74fb9d03.gif', 1.03] // 9 36 周起 足月、撑满羊水囊（头朝上：10-04 用户说头朝下看着不舒服） ]; const DEFAULT = 5; const IMG = 'assets/img/'; const box = document.getElementById('heroBaby'); const still = document.getElementById('heroStill'); const kid = document.getElementById('heroKid'); if (!box || !still || !kid) return; const reduce = matchMedia('(prefers-reduced-motion: reduce)').matches; const force = (location.search.match(/[?&]kidweek=(\d+)/) || [])[1]; function stageOf(week) { if (week == null || isNaN(week)) return DEFAULT; let i = 0; while (i + 1 < STAGES.length && week >= STAGES[i + 1][0]) i++; return i; } let cur = -1, seq = 0; function show(i) { if (i === cur) return; cur = i; const [, png, gif, k] = STAGES[i], my = ++seq; box.style.setProperty('--k', k); // 先把旧图淡掉再换，避免新旧宝宝叠在一起闪一下 kid.classList.remove('is-on'); still.classList.remove('is-on'); const s = new Image(); s.onload = () => { if (my !== seq) return; still.src = s.src; still.classList.add('is-on'); }; s.src = IMG + png; if (reduce) return; const g = new Image(); g.onload = () => { if (my !== seq) return; kid.src = g.src; kid.classList.add('is-on'); }; g.src = IMG + gif; } function onPreg(d) { show(stageOf(force != null ? +force : (d && d.week))); } addEventListener('mb-preg', e => onPreg(e.detail)); if (force != null || window.__mbPreg) onPreg(window.__mbPreg); else setTimeout(() => { if (cur < 0) show(DEFAULT); }, 2500); /* ---------------- 阳光 + 水波 ---------------- 2026-10-04 二版（用户：「水波纹上面要有光束打进来，水波纹要模拟真实羊水的感觉」）： · 折射：.hero-baby（羊水囊 + 宝宝）挂一个 SVG 位移滤镜，噪声图慢慢变形 → 隔着一层液体看的那种轻微晃动 · 焦散：水底那种不规则、不停变形的细亮网（游动点的细胞边界 + 正弦扭曲），低分辨率算完放大，囊附近更亮 · 光束：从顶上斜着打进来，三层叠出软边，各自慢慢摆、忽明忽暗，越往下越散 · 悬浮微粒：羊水里的小颗粒，慢慢漂、闪一下，经过光束时更亮 */ const cv = document.getElementById('heroFx'); if (!cv || reduce) return; const hero = cv.parentNode, home = document.getElementById('screen-home'); const ctx = cv.getContext('2d'); // 折射滤镜：baseFrequency 在 16 秒里来回变 → 噪声缓缓「流动」；位移 5px，看得出是液体，又不至于把宝宝扭坏 const NS = 'http://www.w3.org/2000/svg'; const svg = document.createElementNS(NS, 'svg'); svg.setAttribute('width', '0'); svg.setAttribute('height', '0'); svg.setAttribute('aria-hidden', 'true'); svg.style.position = 'absolute'; svg.innerHTML = '' + '' + '' + ''; document.body.appendChild(svg); box.classList.add('is-fluid'); const CW = 96; // 焦散低分辨率宽（太低会糊成团，看不出是光网） const off = document.createElement('canvas'), oc = off.getContext('2d'); let tick = 0, W = 0, H = 0, dpr = 1, ch = 0, img = null, seen = true, raf = 0, last = 0, prev = 0; let SX = 0, SY = 0, SR = 1; // 羊水囊圆心/半径（CSS px），焦散在囊附近更亮 function size() { const r = hero.getBoundingClientRect(), b = box.getBoundingClientRect(); dpr = Math.min(devicePixelRatio || 1, 2); W = r.width; H = r.height; cv.width = Math.round(W * dpr); cv.height = Math.round(H * dpr); ch = Math.max(8, Math.round(CW * H / W)); off.width = CW; off.height = ch; img = oc.createImageData(CW, ch); SX = b.left - r.left + b.width / 2; SY = b.top - r.top + b.height / 2; SR = Math.max(b.width, 60) / 2; } // 焦散：真实水底那种不规则细亮网 = 一群慢慢游动的点的「细胞边界」（到最近两点距离差 ≈ 0 的地方最亮）， // 坐标再加一点正弦扭曲让边线弯起来；大小两层叠加，一层快一层慢，网格才会像水一样不停变形 function mkLayer(n, cell, seed) { let r = seed; const rnd = () => ((r = (r * 16807) % 2147483647) / 2147483647); return { cell, pts: Array.from({ length: n }, () => [rnd(), rnd(), rnd() * 6.28, .35 + rnd() * .5]) }; } const LAYERS = [[mkLayer(26, 22, 11), .8, 1], [mkLayer(14, 32, 29), .5, .8]]; const PX = new Float32Array(40), PY = new Float32Array(40); function caustics(t) { const d = img.data, sx = SX / W * CW, sy = SY / H * ch, sr = SR / W * CW; const acc = caustics.acc && caustics.acc.length === CW * ch ? caustics.acc : (caustics.acc = new Float32Array(CW * ch)); acc.fill(0); const k = CW / 120; for (const [L, gain, speed] of LAYERS) { const tt = t * speed, cell = L.cell * k, sg = 1 / (2 * (cell * .06) ** 2), n = L.pts.length; for (let i = 0; i < n; i++) { const [bx, by, ph, sp] = L.pts[i]; PX[i] = bx * CW + Math.cos(tt * sp + ph) * cell * .35; PY[i] = by * ch + Math.sin(tt * sp * 1.3 + ph) * cell * .35; } for (let y = 0; y < ch; y++) { const ox = Math.sin(y * .11 / k + tt * .7) * 2.2 * k; for (let x = 0; x < CW; x++) { const wx = x + ox, wy = y + Math.sin(x * .09 / k - tt * .6) * 2.2 * k; let m1 = 1e9, m2 = 1e9; for (let i = 0; i < n; i++) { const dx = wx - PX[i], dy = wy - PY[i], q = dx * dx + dy * dy; if (q < m1) { m2 = m1; m1 = q; } else if (q < m2) m2 = q; } const e = Math.sqrt(m2) - Math.sqrt(m1); acc[y * CW + x] += Math.exp(-e * e * sg) * gain; } } } for (let y = 0; y < ch; y++) { for (let x = 0; x < CW; x++) { let v = acc[y * CW + x]; v = v >= 1 ? 1 : Math.pow(v, 1.3); // 囊里亮、囊外淡，上半部比下半部亮（光从上面来） const dd = Math.hypot(x - sx, y - sy) / sr; const w = (.3 + .7 * Math.max(0, 1 - Math.max(0, dd - .6) * 1.8)) * (1 - y / ch * .45); const o = (y * CW + x) * 4; d[o] = 255; d[o + 1] = 240; d[o + 2] = 220; d[o + 3] = v * 255 * w; } } oc.putImageData(img, 0, 0); } function drawCaustics() { ctx.globalCompositeOperation = 'lighter'; ctx.imageSmoothingEnabled = true; ctx.globalAlpha = 1; ctx.drawImage(off, 0, 0, W, H); ctx.globalAlpha = 1; } // 光束：光源在头图上方偏右的画外，斜着往左下打；每道画三层（宽/中/窄）叠出软边 const RAYS = [[-.16, .030, .7], [-.07, .018, .9], [.01, .040, .6], [.09, .022, 1], [.17, .032, .7], [.26, .02, .55]]; let rayA = []; function rays(t) { const ox = W * .78, oy = -H * .9, L = H * 2.6; ctx.globalCompositeOperation = 'lighter'; rayA = []; RAYS.forEach(([a0, w, al], i) => { const a = Math.PI * .58 + a0 + Math.sin(t * .11 + i * 1.9) * .025; const k = al * (.55 + .45 * Math.sin(t * .29 + i * 2.1)) * (.85 + .15 * Math.sin(t * 1.3 + i * 3.7)); rayA.push([a, w, k]); [[2.2, .25], [1.3, .5], [.6, 1]].forEach(([wm, am]) => { const ww = w * wm; const gr = ctx.createLinearGradient(ox, oy, ox + Math.cos(a) * L * .75, oy + Math.sin(a) * L * .75); gr.addColorStop(0, 'rgba(255,250,230,0)'); gr.addColorStop(.36, 'rgba(255,248,226,' + (.42 * k * am).toFixed(3) + ')'); gr.addColorStop(.62, 'rgba(255,242,215,' + (.22 * k * am).toFixed(3) + ')'); gr.addColorStop(1, 'rgba(255,232,200,0)'); ctx.fillStyle = gr; ctx.beginPath(); ctx.moveTo(ox, oy); ctx.lineTo(ox + Math.cos(a - ww) * L, oy + Math.sin(a - ww) * L); ctx.lineTo(ox + Math.cos(a + ww) * L, oy + Math.sin(a + ww) * L); ctx.closePath(); ctx.fill(); }); }); return [ox, oy]; } // 悬浮微粒：慢慢往上漂、左右游，忽明忽暗；落在光束里更亮 const DOTS = Array.from({ length: 34 }, () => ({ x: Math.random(), y: Math.random(), r: .5 + Math.random() * 1.4, vx: (Math.random() - .5) * .006, vy: -(.004 + Math.random() * .008), ph: Math.random() * 6.3, sp: .6 + Math.random() * 1.4 })); function dots(t, dt, o) { ctx.globalCompositeOperation = 'lighter'; for (const p of DOTS) { p.x += (p.vx + Math.sin(t * .5 + p.ph) * .002) * dt; p.y += p.vy * dt; if (p.y < -.03) { p.y = 1.03; p.x = Math.random(); } if (p.x < -.03) p.x = 1.03; else if (p.x > 1.03) p.x = -.03; const X = p.x * W, Y = p.y * H; let lit = 0; const ang = Math.atan2(Y - o[1], X - o[0]); for (const [a, w, k] of rayA) { const d = Math.abs(ang - a); if (d < w * 1.3) lit = Math.max(lit, k * (1 - d / (w * 1.3))); } const al = (.18 + .3 * (.5 + .5 * Math.sin(t * p.sp + p.ph))) * (1 + lit * 1.6); const R = p.r * 2.4, g = ctx.createRadialGradient(X, Y, 0, X, Y, R); g.addColorStop(0, 'rgba(255,250,238,' + Math.min(al, .9).toFixed(3) + ')'); g.addColorStop(1, 'rgba(255,250,238,0)'); ctx.fillStyle = g; ctx.beginPath(); ctx.arc(X, Y, R, 0, 6.2832); ctx.fill(); } } function frame(now) { raf = 0; if (!(seen && !document.hidden && (!home || home.classList.contains('is-active')))) { prev = 0; return; } raf = requestAnimationFrame(frame); if (now - last < 33) return; // ≈30fps 足够，省电 const dt = prev ? Math.min((now - prev) / 1000, .1) : 0; prev = now; last = now; const t = now / 1000; ctx.setTransform(dpr, 0, 0, dpr, 0, 0); ctx.clearRect(0, 0, W, H); if ((tick ^= 1)) caustics(t); // 焦散 15fps 算一次就够（水底光网本来就慢），每帧照画 drawCaustics(); const o = rays(t); dots(t, dt, o); } function kick() { if (!raf) raf = requestAnimationFrame(frame); } size(); addEventListener('resize', () => { size(); kick(); }); box.addEventListener('transitionend', size); // 换阶段后孕囊尺寸变了，焦散的「囊附近更亮」跟着挪 document.addEventListener('visibilitychange', kick); if (home) new MutationObserver(kick).observe(home, { attributes: true, attributeFilter: ['class'] }); if ('IntersectionObserver' in window) new IntersectionObserver(es => { seen = es[0].isIntersecting; kick(); }).observe(hero); cv.classList.add('is-on'); kick(); })();