/* ================= 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。 柔光束 + 柔和水波光影 + 悬浮微粒,宝宝区域避开(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 三版(用户:「光束太硬,要柔柔地射进来;水波纹可以有,但宝宝的脸不能变;不要白色网状水波纹」): · 光束:画在 1/6 分辨率的小画布上再放大,边缘天然糊开 → 柔光;宽、淡、慢慢摆、忽明忽暗 · 水波:极低分辨率算几层正弦叠出的大片明暗,放大后是柔和的、缓缓流动的光影(不是网) · 宝宝区域(孕囊中心 70% 半径内)水波压到很淡、光束减半;不再给孕囊挂任何形变滤镜,宝宝的脸一像素都不动 · 悬浮微粒:羊水里的小颗粒,慢慢漂、闪一下 */ const cv = document.getElementById('heroFx'); if (!cv || reduce) return; const hero = cv.parentNode, home = document.getElementById('screen-home'); const ctx = cv.getContext('2d'); const RS = 6; // 光束小画布缩小倍数 const rc = document.createElement('canvas'), rx = rc.getContext('2d'); const CW = 32; // 水波低分辨率宽(越低越柔) 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; // 孕囊圆心/半径(CSS px) 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); rc.width = Math.max(8, Math.round(W / RS)); rc.height = Math.max(8, Math.round(H / RS)); 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; } // 宝宝保护:孕囊中心附近 → 0,囊边 → 1 function guard(x, y) { const d = Math.hypot(x - SX, y - SY) / SR; return d < .45 ? 0 : d > .95 ? 1 : (d - .45) / .5; } // 水波:四层不同方向、不同速度的长波叠加,取正半部分 → 一片片柔和的亮斑缓缓流过 function water(t) { const d = img.data, T = t * .45; for (let y = 0; y < ch; y++) { for (let x = 0; x < CW; x++) { const u = x / CW * 6, v = y / CW * 6; let w = Math.sin(u * 1.1 + T) + Math.sin(v * 1.3 - T * .8 + u * .4) + Math.sin((u - v) * .9 + T * .6) + Math.sin(Math.hypot(u - 4.5, v - 1) * 1.6 - T * 1.1); w = w / 4; w = w > 0 ? w * w : 0; // 只留亮的那半,平方让过渡更软 const X = x / CW * W, Y = y / ch * H; const g = .15 + .85 * guard(X, Y); const o = (y * CW + x) * 4; d[o] = 255; d[o + 1] = 238; d[o + 2] = 214; d[o + 3] = w * 200 * g * (1 - y / ch * .35); } } oc.putImageData(img, 0, 0); } function drawWater() { ctx.globalCompositeOperation = 'lighter'; ctx.imageSmoothingEnabled = true; ctx.imageSmoothingQuality = 'high'; ctx.globalAlpha = .55; ctx.drawImage(off, 0, 0, W, H); ctx.globalAlpha = 1; } // 柔光束:光源在头图上方偏右画外;每道是一条很宽的渐变扇形,画在小画布上再放大 const RAYS = [[-.12, .07, .8], [0, .05, .7], [.11, .08, 1], [.23, .06, .7]]; function rays(t) { const w = rc.width, h = rc.height, ox = w * .8, oy = -h * .9, L = h * 2.8; rx.setTransform(1, 0, 0, 1, 0, 0); rx.clearRect(0, 0, w, h); rx.globalCompositeOperation = 'lighter'; RAYS.forEach(([a0, ww, al], i) => { const a = Math.PI * .6 + a0 + Math.sin(t * .09 + i * 1.9) * .03; const k = al * (.6 + .4 * Math.sin(t * .23 + i * 2.1)); const wv = ww * (1 + .2 * Math.sin(t * .17 + i)); const gr = rx.createLinearGradient(ox, oy, ox + Math.cos(a) * L * .8, oy + Math.sin(a) * L * .8); gr.addColorStop(0, 'rgba(255,248,228,0)'); gr.addColorStop(.35, 'rgba(255,246,224,' + (.34 * k).toFixed(3) + ')'); gr.addColorStop(.65, 'rgba(255,240,215,' + (.15 * k).toFixed(3) + ')'); gr.addColorStop(1, 'rgba(255,235,205,0)'); rx.fillStyle = gr; rx.beginPath(); rx.moveTo(ox, oy); rx.lineTo(ox + Math.cos(a - wv) * L, oy + Math.sin(a - wv) * L); rx.lineTo(ox + Math.cos(a + wv) * L, oy + Math.sin(a + wv) * L); rx.closePath(); rx.fill(); }); // 宝宝区域光束减半:在小画布上挖一个软边的「淡区」 rx.globalCompositeOperation = 'destination-out'; const sx = SX / RS, sy = SY / RS, sr = SR / RS, g = rx.createRadialGradient(sx, sy, 0, sx, sy, sr * .9); g.addColorStop(0, 'rgba(0,0,0,.5)'); g.addColorStop(.6, 'rgba(0,0,0,.35)'); g.addColorStop(1, 'rgba(0,0,0,0)'); rx.fillStyle = g; rx.beginPath(); rx.arc(sx, sy, sr, 0, 6.2832); rx.fill(); ctx.globalCompositeOperation = 'lighter'; ctx.imageSmoothingEnabled = true; ctx.imageSmoothingQuality = 'high'; ctx.drawImage(rc, 0, 0, W, H); } // 悬浮微粒:慢慢往上漂、左右游,忽明忽暗;孕囊中心附近不画,免得落在宝宝脸上 const DOTS = Array.from({ length: 26 }, () => ({ x: Math.random(), y: Math.random(), r: .5 + Math.random() * 1.2, 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) { 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, gd = guard(X, Y); if (gd <= 0) continue; const al = (.15 + .25 * (.5 + .5 * Math.sin(t * p.sp + p.ph))) * gd; const R = p.r * 2.4, g = ctx.createRadialGradient(X, Y, 0, X, Y, R); g.addColorStop(0, 'rgba(255,250,238,' + al.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)) water(t); // 水波 15fps 算一次就够,每帧照画 drawWater(); rays(t); dots(t, dt); } 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,保护区跟着挪 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(); })();