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git://f0xx.org/android_cast
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initiaal 3d
This commit is contained in:
Anton Afanasyeu
404
examples/app_hub/assets/hub-globe.js
Normal file
404
examples/app_hub/assets/hub-globe.js
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/**
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* Hub landing globe — orthographic Canvas2D (matches static SVG stack at rotation 0).
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* Bakes globe + continents-mercator-globe + grid overlay into an equirectangular map,
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* then scrolls it for Y-axis rotation (same visual language as the flat layers).
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*/
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export const GLOBE_VIEW = { imgW: 1920, imgH: 1080, cx: 720, cy: 560, r: 322, rim: 330 };
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/** Idle spin: ~4× slower than the first Three.js attempt (0.14 → 0.035 rad/s). */
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const AUTO_SPIN_RAD_S = 0.035;
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const DRAG_ROTATION_PER_PX = 0.004;
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const EQ_WIDTH = 1024;
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const EQ_HEIGHT = 512;
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const OCEAN_FALLBACK = { r: 22, g: 38, b: 60 };
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function hubAsset(rel, build) {
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const link = document.querySelector('link[href*="hub.css"]');
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const base = link ? (link.getAttribute('href') || '').replace(/[^/]*$/, '') : '';
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const sep = rel.indexOf('?') >= 0 ? '&' : '?';
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return base + rel + sep + 'v=' + build;
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}
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export function globeCoverRect() {
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const vw = window.innerWidth;
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const vh = window.innerHeight;
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const scale = Math.max(vw / GLOBE_VIEW.imgW, vh / GLOBE_VIEW.imgH);
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const drawW = GLOBE_VIEW.imgW * scale;
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const drawH = GLOBE_VIEW.imgH * scale;
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const offX = (vw - drawW) / 2;
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const offY = (vh - drawH) / 2;
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const left = offX + (GLOBE_VIEW.cx - GLOBE_VIEW.r) * scale;
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const top = offY + (GLOBE_VIEW.cy - GLOBE_VIEW.r) * scale;
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const size = GLOBE_VIEW.r * 2 * scale;
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return {
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left,
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top,
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width: size,
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height: size,
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scale,
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cx: GLOBE_VIEW.cx * scale + offX,
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cy: GLOBE_VIEW.cy * scale + offY,
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r: GLOBE_VIEW.r * scale,
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rim: GLOBE_VIEW.rim * scale,
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};
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}
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function loadImage(url) {
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return new Promise((resolve, reject) => {
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const img = new Image();
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img.onload = () => resolve(img);
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img.onerror = () => reject(new Error('image load failed: ' + url));
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img.src = url;
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});
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}
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function compositeStaticLayers(globeImg, continentsImg, gridImg) {
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const c = document.createElement('canvas');
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c.width = GLOBE_VIEW.imgW;
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c.height = GLOBE_VIEW.imgH;
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const ctx = c.getContext('2d', { willReadFrequently: true });
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ctx.drawImage(globeImg, 0, 0, c.width, c.height);
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ctx.drawImage(continentsImg, 0, 0, c.width, c.height);
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ctx.drawImage(gridImg, 0, 0, c.width, c.height);
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return { canvas: c, ctx, data: ctx.getImageData(0, 0, c.width, c.height) };
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}
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function sampleComposite(data, sx, sy) {
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const w = data.width;
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const h = data.height;
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const x = Math.max(0, Math.min(w - 1, Math.round(sx)));
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const y = Math.max(0, Math.min(h - 1, Math.round(sy)));
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const i = (y * w + x) * 4;
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return [data.data[i], data.data[i + 1], data.data[i + 2], data.data[i + 3]];
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}
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function sampleMercatorFlat(ctx, lon, lat) {
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const w = ctx.canvas.width;
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const h = ctx.canvas.height;
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const u = (lon + Math.PI) / (2 * Math.PI);
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const v = 0.5 - lat / Math.PI;
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const x = Math.max(0, Math.min(w - 1, Math.round(u * (w - 1))));
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const y = Math.max(0, Math.min(h - 1, Math.round(v * (h - 1))));
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const d = ctx.getImageData(x, y, 1, 1).data;
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return [d[0], d[1], d[2], d[3]];
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}
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/**
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* Build equirectangular texture from the static orthographic hub artwork.
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*/
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function bakeEquirectangular(compositeData, mercatorFlatImg) {
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const merc = document.createElement('canvas');
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merc.width = mercatorFlatImg.naturalWidth || 800;
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merc.height = mercatorFlatImg.naturalHeight || 519;
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const mercCtx = merc.getContext('2d', { willReadFrequently: true });
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mercCtx.drawImage(mercatorFlatImg, 0, 0);
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const eq = document.createElement('canvas');
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eq.width = EQ_WIDTH;
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eq.height = EQ_HEIGHT;
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const out = eq.getContext('2d').createImageData(EQ_WIDTH, EQ_HEIGHT);
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const { cx, cy, r } = GLOBE_VIEW;
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for (let j = 0; j < EQ_HEIGHT; j++) {
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for (let i = 0; i < EQ_WIDTH; i++) {
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const lon = (i / EQ_WIDTH) * 2 * Math.PI - Math.PI;
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const lat = Math.PI * 0.5 - (j / EQ_HEIGHT) * Math.PI;
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const cosLat = Math.cos(lat);
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const x3 = cosLat * Math.sin(lon);
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const y3 = Math.sin(lat);
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const z3 = cosLat * Math.cos(lon);
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let rgba;
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if (z3 > 0.02) {
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const sx = cx + x3 * r;
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const sy = cy - y3 * r;
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rgba = sampleComposite(compositeData, sx, sy);
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if (rgba[3] < 8) {
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rgba = sampleMercatorFlat(mercCtx, lon, lat);
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}
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} else {
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rgba = sampleMercatorFlat(mercCtx, lon, lat);
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if (rgba[3] < 16) {
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rgba = [OCEAN_FALLBACK.r, OCEAN_FALLBACK.g, OCEAN_FALLBACK.b, 255];
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}
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}
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const p = (j * EQ_WIDTH + i) * 4;
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out.data[p] = rgba[0];
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out.data[p + 1] = rgba[1];
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out.data[p + 2] = rgba[2];
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out.data[p + 3] = 255;
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}
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}
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eq.getContext('2d').putImageData(out, 0, 0);
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return eq;
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}
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function drawEquirectSlice(ctx, eqCanvas, rotation, dx, dy, diam) {
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const w = eqCanvas.width;
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const h = eqCanvas.height;
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const offsetPx = ((rotation / (2 * Math.PI)) % 1) * w;
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const ox = ((offsetPx % w) + w) % w;
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ctx.save();
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ctx.beginPath();
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ctx.arc(dx, dy, diam * 0.5, 0, Math.PI * 2);
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ctx.clip();
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ctx.drawImage(eqCanvas, -ox, 0, w, h, dx - diam * 0.5, dy - diam * 0.5, diam, diam);
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ctx.drawImage(eqCanvas, w - ox, 0, w, h, dx - diam * 0.5 + diam, dy - diam * 0.5, diam, diam);
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ctx.restore();
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}
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function strokeMeridian(ctx, cx, cy, r, lonRad, rotY, strokeStyle, lineWidth) {
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const pts = [];
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for (let i = 0; i <= 64; i++) {
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const lat = -Math.PI / 2 + (i / 64) * Math.PI;
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const cosLat = Math.cos(lat);
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let x = cosLat * Math.sin(lonRad);
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let y = Math.sin(lat);
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let z = cosLat * Math.cos(lonRad);
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const x2 = x * Math.cos(rotY) + z * Math.sin(rotY);
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const z2 = -x * Math.sin(rotY) + z * Math.cos(rotY);
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if (z2 > 0.04) {
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pts.push({ x: cx + x2 * r, y: cy - y * r });
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}
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}
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if (pts.length < 2) return;
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ctx.beginPath();
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ctx.moveTo(pts[0].x, pts[0].y);
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for (let k = 1; k < pts.length; k++) ctx.lineTo(pts[k].x, pts[k].y);
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ctx.strokeStyle = strokeStyle;
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ctx.lineWidth = lineWidth;
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ctx.lineCap = 'round';
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ctx.stroke();
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}
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function drawGridOverlay(ctx, rect, rotY) {
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const cx = rect.cx;
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const cy = rect.cy;
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const r = rect.r;
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ctx.save();
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ctx.beginPath();
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ctx.arc(cx, cy, r, 0, Math.PI * 2);
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ctx.clip();
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const equatorGrad = ctx.createLinearGradient(cx - r, cy, cx + r, cy);
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equatorGrad.addColorStop(0, 'rgba(39,54,75,0.74)');
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equatorGrad.addColorStop(0.5, 'rgba(219,231,246,0.88)');
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equatorGrad.addColorStop(1, 'rgba(31,44,64,0.74)');
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ctx.beginPath();
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ctx.ellipse(cx, cy, r * 0.99, r * 0.034, 0, 0, 2 * Math.PI);
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ctx.strokeStyle = equatorGrad;
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ctx.lineWidth = Math.max(2, rect.scale * 0.007);
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ctx.stroke();
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const poleRy = r * 0.12;
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ctx.beginPath();
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ctx.ellipse(cx, cy - r * 0.52, r * 0.82, poleRy, 0, 0, 2 * Math.PI);
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ctx.strokeStyle = 'rgba(231,236,243,0.72)';
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ctx.lineWidth = Math.max(1.5, rect.scale * 0.0055);
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ctx.stroke();
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ctx.beginPath();
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ctx.ellipse(cx, cy + r * 0.52, r * 0.82, poleRy, 0, 0, 2 * Math.PI);
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ctx.stroke();
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const meridianStroke = 'rgba(238,245,255,0.92)';
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const primeStroke = 'rgba(238,245,255,0.98)';
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const lw = Math.max(2.5, rect.scale * 0.008);
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const lwPrime = Math.max(3, rect.scale * 0.0095);
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for (let lonDeg = -150; lonDeg <= 150; lonDeg += 30) {
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const lon = (lonDeg * Math.PI) / 180;
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const isPrime = lonDeg === 0;
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strokeMeridian(ctx, cx, cy, r, lon, rotY, isPrime ? primeStroke : meridianStroke, isPrime ? lwPrime : lw);
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}
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ctx.beginPath();
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ctx.arc(cx, cy, 4, 0, Math.PI * 2);
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ctx.fillStyle = '#5eead4';
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ctx.fill();
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ctx.strokeStyle = '#0a0e14';
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ctx.lineWidth = 1;
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ctx.stroke();
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ctx.restore();
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}
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function drawRim(ctx, compositeCanvas, cx, cy, r, rim, scale) {
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const drawW = GLOBE_VIEW.imgW * scale;
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const drawH = GLOBE_VIEW.imgH * scale;
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const dx = cx - GLOBE_VIEW.cx * scale;
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const dy = cy - GLOBE_VIEW.cy * scale;
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ctx.save();
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ctx.beginPath();
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ctx.arc(cx, cy, rim, 0, Math.PI * 2);
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ctx.arc(cx, cy, r, 0, Math.PI * 2, true);
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ctx.clip();
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ctx.drawImage(compositeCanvas, 0, 0, GLOBE_VIEW.imgW, GLOBE_VIEW.imgH, dx, dy, drawW, drawH);
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ctx.restore();
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}
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/**
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* @param {HTMLElement} stage
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* @param {{ build: string, reducedMotion?: boolean }} opts
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*/
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export async function mountHubGlobe(stage, opts) {
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const build = opts.build || 'earth3d';
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const reducedMotion = !!opts.reducedMotion;
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const canvas = document.createElement('canvas');
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canvas.className = 'hub-globe-canvas';
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canvas.setAttribute('aria-hidden', 'true');
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stage.appendChild(canvas);
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const urls = {
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globe: hubAsset('assets/hub-logo-fragment-globe.svg', build),
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continents: hubAsset('assets/hub-logo-continents-mercator-globe.svg', build),
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grid: hubAsset('assets/hub-logo-fragment-globe-grid-overlay.svg', build),
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mercatorFlat: hubAsset('assets/hub-logo-continents-mercator-flat.svg', build),
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};
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let globeImg;
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let continentsImg;
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let gridImg;
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let mercatorFlatImg;
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try {
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[globeImg, continentsImg, gridImg, mercatorFlatImg] = await Promise.all([
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loadImage(urls.globe),
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loadImage(urls.continents),
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loadImage(urls.grid),
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loadImage(urls.mercatorFlat),
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]);
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} catch (e) {
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console.warn('HubGlobe: asset load failed', e);
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canvas.remove();
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return null;
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}
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const composite = compositeStaticLayers(globeImg, continentsImg, gridImg);
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const eqCanvas = bakeEquirectangular(composite.data, mercatorFlatImg);
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let rotation = 0;
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let angularVelocity = reducedMotion ? 0 : AUTO_SPIN_RAD_S;
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let dragging = false;
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let lastPointerX = 0;
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let lastPointerTime = 0;
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let raf = 0;
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let lastFrame = performance.now();
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const ctx = canvas.getContext('2d');
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const resize = () => {
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const rect = globeCoverRect();
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const dpr = Math.min(window.devicePixelRatio || 1, 2);
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const px = Math.max(64, Math.floor(rect.width * dpr));
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canvas.style.left = rect.left + 'px';
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canvas.style.top = rect.top + 'px';
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canvas.style.width = rect.width + 'px';
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canvas.style.height = rect.height + 'px';
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canvas.width = px;
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canvas.height = px;
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return { rect, dpr, px };
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};
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let layout = resize();
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window.addEventListener('resize', () => {
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layout = resize();
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});
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const render = () => {
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const { rect, dpr, px } = layout;
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const cx = (rect.cx - rect.left) * dpr;
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const cy = (rect.cy - rect.top) * dpr;
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const r = rect.r * dpr;
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const rim = rect.rim * dpr;
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const drawRect = {
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cx,
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cy,
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r,
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rim,
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scale: rect.scale * dpr,
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left: 0,
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top: 0,
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};
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ctx.clearRect(0, 0, px, px);
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drawEquirectSlice(ctx, eqCanvas, rotation, cx, cy, r * 2);
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drawGridOverlay(ctx, drawRect, rotation);
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drawRim(ctx, composite.canvas, cx, cy, r, rim, rect.scale * dpr);
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};
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const onPointerDown = (ev) => {
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if (ev.button !== 0) return;
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dragging = true;
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lastPointerX = ev.clientX;
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lastPointerTime = performance.now();
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canvas.setPointerCapture(ev.pointerId);
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canvas.classList.add('is-dragging');
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ev.preventDefault();
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};
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const onPointerMove = (ev) => {
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if (!dragging) return;
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const now = performance.now();
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const dx = ev.clientX - lastPointerX;
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rotation += dx * DRAG_ROTATION_PER_PX;
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if (now > lastPointerTime) {
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const inst = (dx * DRAG_ROTATION_PER_PX) / ((now - lastPointerTime) / 1000);
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angularVelocity = Math.max(-2.5, Math.min(2.5, inst));
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}
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lastPointerX = ev.clientX;
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lastPointerTime = now;
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ev.preventDefault();
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};
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const endDrag = (ev) => {
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if (!dragging) return;
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dragging = false;
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canvas.classList.remove('is-dragging');
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try {
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canvas.releasePointerCapture(ev.pointerId);
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} catch (ignored) {}
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};
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canvas.addEventListener('pointerdown', onPointerDown);
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canvas.addEventListener('pointermove', onPointerMove);
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canvas.addEventListener('pointerup', endDrag);
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canvas.addEventListener('pointercancel', endDrag);
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const tick = (now) => {
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raf = requestAnimationFrame(tick);
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const dt = Math.min(0.05, (now - lastFrame) / 1000);
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lastFrame = now;
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if (!dragging) {
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if (!reducedMotion) {
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const target = AUTO_SPIN_RAD_S;
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angularVelocity += (target - angularVelocity) * 1.2 * dt;
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if (Math.abs(angularVelocity - target) < 0.004) angularVelocity = target;
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} else {
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angularVelocity *= Math.exp(-4 * dt);
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}
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rotation += angularVelocity * dt;
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}
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render();
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};
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raf = requestAnimationFrame(tick);
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stage.dataset.globe3d = 'active';
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return {
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destroy() {
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cancelAnimationFrame(raf);
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window.removeEventListener('resize', resize);
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canvas.remove();
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delete stage.dataset.globe3d;
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},
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};
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}
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