mirror of
git://f0xx.org/ac/ac-be-hub
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628 lines
17 KiB
JavaScript
628 lines
17 KiB
JavaScript
/**
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* Hub landing globe — orthographic Canvas2D (globe3d=1).
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* Grid: hub SVG ellipses (E–W) + meridian paths (N–S) traced on sphere, then Y-rotated.
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* Land: ortho hub disk on front face; mercator-flat only on back wrap (avoids front squeeze).
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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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const AUTO_SPIN_RAD_S = 0.035;
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const DRAG_ROTATION_PER_PX = 0.004;
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const OCEAN_FALLBACK = { r: 22, g: 38, b: 60 };
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const FRONT_Z = 0.04;
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const RASTER_SCALE = 2;
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const AXIS_STEPS = 160;
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/** hub-logo-fragment-globe-grid-overlay.svg — E–W parallels. */
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const HUB_EW_PARALLELS = [
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{ cx: 720, cy: 560, rx: 318, ry: 11, bright: true },
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{ cx: 720, cy: 392, rx: 260, ry: 39, bright: false },
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{ cx: 720, cy: 728, rx: 260, ry: 39, bright: false },
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];
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/** Same SVG — N–S meridians (line + quadratic beziers). */
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const HUB_NS_MERIDIANS = [
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{ prime: true, points: sampleLinePoints(720, 248, 720, 872, AXIS_STEPS) },
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{ prime: false, points: sampleQuadPoints(620, 248, 358, 560, 620, 872, AXIS_STEPS) },
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{ prime: false, points: sampleQuadPoints(820, 248, 1082, 560, 820, 872, AXIS_STEPS) },
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];
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function sampleLinePoints(x0, y0, x1, y1, steps) {
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const pts = [];
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for (let i = 0; i <= steps; i++) {
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const t = i / steps;
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pts.push({ x: x0 + (x1 - x0) * t, y: y0 + (y1 - y0) * t });
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}
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return pts;
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}
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function sampleQuadPoints(x0, y0, cx, cy, x1, y1, steps) {
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const pts = [];
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for (let i = 0; i <= steps; i++) {
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const t = i / steps;
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const u = 1 - t;
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pts.push({
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x: u * u * x0 + 2 * u * t * cx + t * t * x1,
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y: u * u * y0 + 2 * u * t * cy + t * t * y1,
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});
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}
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return pts;
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}
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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 rasterizeImage(img, w, h, scale) {
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const s = scale || 1;
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const rw = Math.max(1, Math.round(w * s));
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const rh = Math.max(1, Math.round(h * s));
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const c = document.createElement('canvas');
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c.width = rw;
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c.height = rh;
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const ctx = c.getContext('2d', { willReadFrequently: true });
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ctx.imageSmoothingEnabled = true;
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ctx.imageSmoothingQuality = 'high';
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ctx.drawImage(img, 0, 0, rw, rh);
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return { data: ctx.getImageData(0, 0, rw, rh).data, w: rw, h: rh };
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}
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function sampleImageDataBilinear(imgData, w, h, fx, fy) {
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const x = Math.max(0, Math.min(w - 1.001, fx));
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const y = Math.max(0, Math.min(h - 1.001, fy));
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const x0 = x | 0;
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const y0 = y | 0;
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const x1 = Math.min(w - 1, x0 + 1);
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const y1 = Math.min(h - 1, y0 + 1);
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const tx = x - x0;
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const ty = y - y0;
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const i00 = (y0 * w + x0) * 4;
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const i10 = (y0 * w + x1) * 4;
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const i01 = (y1 * w + x0) * 4;
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const i11 = (y1 * w + x1) * 4;
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const out = [0, 0, 0, 0];
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for (let c = 0; c < 4; c++) {
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out[c] = Math.round(
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imgData[i00 + c] * (1 - tx) * (1 - ty) +
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imgData[i10 + c] * tx * (1 - ty) +
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imgData[i01 + c] * (1 - tx) * ty +
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imgData[i11 + c] * tx * ty
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);
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}
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return out;
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}
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function inverseRotateY(nx, ny, nz, rotY) {
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const cosR = Math.cos(rotY);
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const sinR = Math.sin(rotY);
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return {
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x: nx * cosR - nz * sinR,
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y: ny,
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z: nx * sinR + nz * cosR,
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};
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}
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function bodyToTex(body) {
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return { x: body.x, y: -body.y, z: body.z };
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}
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function bodyToView(body, rotY) {
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const cosR = Math.cos(rotY);
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const sinR = Math.sin(rotY);
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return {
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x: body.x * cosR + body.z * sinR,
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y: body.y,
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z: -body.x * sinR + body.z * cosR,
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};
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}
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/** Hub disk pixel → unit-sphere body (front hemisphere, matches globe3d=0). */
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function hubPixelToBody(hpX, hpY) {
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const texX = (hpX - GLOBE_VIEW.cx) / GLOBE_VIEW.r;
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const texY = (GLOBE_VIEW.cy - hpY) / GLOBE_VIEW.r;
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const rr = texX * texX + texY * texY;
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if (rr > 1.001) {
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return null;
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}
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return {
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x: texX,
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y: -texY,
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z: Math.sqrt(Math.max(0, 1 - rr)),
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};
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}
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function hubPointsToBodyRing(points) {
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const out = [];
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for (let i = 0; i < points.length; i++) {
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const body = hubPixelToBody(points[i].x, points[i].y);
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if (body) {
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out.push(body);
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}
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}
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return out;
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}
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function ellipseBodyRing(ellipse, steps) {
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const out = [];
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for (let i = 0; i <= steps; i++) {
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const a = (i / steps) * Math.PI * 2;
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const body = hubPixelToBody(
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ellipse.cx + ellipse.rx * Math.cos(a),
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ellipse.cy + ellipse.ry * Math.sin(a)
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);
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if (body) {
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out.push(body);
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}
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}
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return out;
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}
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function parallelStyle(bright, scale, z) {
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const t = Math.max(0, Math.min(1, (z - FRONT_Z) / (0.95 - FRONT_Z)));
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if (t <= 0) {
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return null;
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}
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const alpha = bright ? 0.55 + 0.45 * t : 0.35 + 0.5 * t;
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const rgb = bright ? '219,231,246' : '231,236,243';
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return {
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color: 'rgba(' + rgb + ',' + alpha.toFixed(3) + ')',
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width: Math.max(bright ? 3 : 2, scale * (bright ? 0.009 : 0.006)) * (0.5 + 0.5 * t),
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};
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}
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function meridianStyle(prime, scale, z) {
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const t = Math.max(0, Math.min(1, (z - FRONT_Z) / (0.95 - FRONT_Z)));
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if (t <= 0) {
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return null;
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}
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const alpha = prime ? 0.5 + 0.48 * t : 0.3 + 0.45 * t;
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return {
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color: 'rgba(238,245,255,' + alpha.toFixed(3) + ')',
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width: Math.max(prime ? 3 : 2.5, scale * (prime ? 0.0095 : 0.008)) * (0.45 + 0.55 * t),
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};
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}
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function strokeBodyRing(ctx, cx, cy, r, rotY, bodies, styleAt) {
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let run = [];
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function flush() {
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if (run.length < 2) {
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run = [];
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return;
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}
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let zSum = 0;
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for (let i = 0; i < run.length; i++) {
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zSum += run[i].z;
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}
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const style = styleAt(zSum / run.length);
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if (!style) {
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run = [];
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return;
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}
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ctx.beginPath();
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ctx.moveTo(run[0].sx, run[0].sy);
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for (let i = 1; i < run.length; i++) {
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ctx.lineTo(run[i].sx, run[i].sy);
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}
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ctx.strokeStyle = style.color;
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ctx.lineWidth = style.width;
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ctx.lineCap = 'round';
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ctx.lineJoin = 'round';
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ctx.stroke();
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run = [];
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}
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for (let i = 0; i < bodies.length; i++) {
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const view = bodyToView(bodies[i], rotY);
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if (view.z <= FRONT_Z) {
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flush();
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continue;
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}
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run.push({
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sx: cx + view.x * r,
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sy: cy - view.y * r,
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z: view.z,
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});
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}
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flush();
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}
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/** Hub SVG grid: E–W ellipses + N–S meridian paths (matches globe3d=0 artwork geometry). */
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function drawHubGrid(ctx, cx, cy, r, rotY, layoutScale) {
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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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HUB_EW_PARALLELS.forEach(function (ellipse) {
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strokeBodyRing(ctx, cx, cy, r, rotY, ellipseBodyRing(ellipse, AXIS_STEPS), function (z) {
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return parallelStyle(ellipse.bright, layoutScale, z);
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});
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});
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HUB_NS_MERIDIANS.forEach(function (mer) {
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strokeBodyRing(ctx, cx, cy, r, rotY, hubPointsToBodyRing(mer.points), function (z) {
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return meridianStyle(mer.prime, layoutScale, z);
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});
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});
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ctx.restore();
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}
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function sampleHub(layer, tex) {
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const hp = {
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x: GLOBE_VIEW.cx + tex.x * GLOBE_VIEW.r,
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y: GLOBE_VIEW.cy - tex.y * GLOBE_VIEW.r,
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};
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const sx = (hp.x / GLOBE_VIEW.imgW) * (layer.w - 1);
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const sy = (hp.y / GLOBE_VIEW.imgH) * (layer.h - 1);
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return sampleImageDataBilinear(layer.data, layer.w, layer.h, sx, sy);
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}
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function texLonLat(tex) {
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return {
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lon: Math.atan2(tex.x, tex.z),
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lat: Math.asin(Math.max(-1, Math.min(1, tex.y))),
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};
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}
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function sampleMercFlat(mercFlat, lon, lat) {
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const u = ((lon + Math.PI) / (2 * Math.PI)) * (mercFlat.w - 1);
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const v = (0.5 - lat / Math.PI) * (mercFlat.h - 1);
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return sampleImageDataBilinear(mercFlat.data, mercFlat.w, mercFlat.h, u, v);
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}
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function isLandPixel(r, g, b, a) {
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return a > 10 && r > 100 && g < 140 && b < 140;
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}
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/** Light hub grid strokes baked into hub-logo-fragment-globe.svg (vector grid drawn separately). */
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function isGridPixel(r, g, b, a) {
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if (a < 12) {
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return false;
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}
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const lum = r * 0.299 + g * 0.587 + b * 0.114;
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if (lum < 125) {
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return false;
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}
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if (g < 155 || b < 155) {
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return false;
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}
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return Math.max(r, g, b) - Math.min(r, g, b) < 85;
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}
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function sampleOceanRgba(globe, tex) {
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if (tex.z <= FRONT_Z) {
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return [OCEAN_FALLBACK.r, OCEAN_FALLBACK.g, OCEAN_FALLBACK.b, 255];
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}
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const s = sampleHub(globe, tex);
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if (s[3] > 8 && !isGridPixel(s[0], s[1], s[2], s[3])) {
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return [s[0], s[1], s[2], 255];
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}
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return [OCEAN_FALLBACK.r, OCEAN_FALLBACK.g, OCEAN_FALLBACK.b, 255];
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}
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function sampleLandRgba(continents, mercFlat, tex) {
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if (tex.z > FRONT_Z) {
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const ortho = sampleHub(continents, tex);
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if (ortho[3] > 6) {
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return ortho;
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}
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return null;
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}
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if (tex.z > -FRONT_Z) {
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return null;
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}
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const ll = texLonLat(tex);
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const flat = sampleMercFlat(mercFlat, ll.lon, ll.lat);
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if (isLandPixel(flat[0], flat[1], flat[2], flat[3])) {
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return [flat[0], flat[1], flat[2], Math.min(255, flat[3])];
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}
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return null;
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}
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function fillDiskRegion(ctx, cx, cy, r, rotY, fn) {
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const r2 = r * r;
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const x0 = Math.max(0, Math.floor(cx - r));
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const y0 = Math.max(0, Math.floor(cy - r));
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const x1 = Math.min(ctx.canvas.width - 1, Math.ceil(cx + r));
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const y1 = Math.min(ctx.canvas.height - 1, Math.ceil(cy + r));
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const w = x1 - x0 + 1;
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const h = y1 - y0 + 1;
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if (w <= 0 || h <= 0) {
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return null;
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}
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const out = ctx.createImageData(w, h);
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const px = out.data;
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let p = 0;
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for (let dy = y0; dy <= y1; dy++) {
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for (let dx = x0; dx <= x1; dx++) {
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const ox = dx - cx;
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const oy = dy - cy;
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if (ox * ox + oy * oy > r2) {
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px[p++] = 0;
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px[p++] = 0;
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px[p++] = 0;
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px[p++] = 0;
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continue;
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}
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const nx = ox / r;
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const ny = oy / r;
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const nz = Math.sqrt(Math.max(0, 1 - nx * nx - ny * ny));
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const tex = bodyToTex(inverseRotateY(nx, ny, nz, rotY));
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const rgba = fn(tex);
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px[p++] = rgba[0];
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px[p++] = rgba[1];
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px[p++] = rgba[2];
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px[p++] = rgba[3] !== undefined ? rgba[3] : 255;
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}
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}
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return { out, x0, y0 };
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}
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function blitLayer(ctx, cx, cy, r, layer) {
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if (!layer) {
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return;
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}
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const { out, x0, y0 } = layer;
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const w = out.width;
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const h = out.height;
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const src = out.data;
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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 existing = ctx.getImageData(x0, y0, w, h);
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const dst = existing.data;
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for (let i = 0; i < src.length; i += 4) {
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const sa = src[i + 3];
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if (sa === 0) {
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continue;
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}
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if (sa === 255) {
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dst[i] = src[i];
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dst[i + 1] = src[i + 1];
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dst[i + 2] = src[i + 2];
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dst[i + 3] = 255;
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continue;
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}
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const a = sa / 255;
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dst[i] = Math.round(src[i] * a + dst[i] * (1 - a));
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dst[i + 1] = Math.round(src[i + 1] * a + dst[i + 1] * (1 - a));
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dst[i + 2] = Math.round(src[i + 2] * a + dst[i + 2] * (1 - a));
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dst[i + 3] = 255;
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}
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ctx.putImageData(existing, x0, y0);
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ctx.restore();
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}
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function drawRim(ctx, globeImg, cx, cy, r, rim, layoutScale) {
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const drawW = GLOBE_VIEW.imgW * layoutScale;
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const drawH = GLOBE_VIEW.imgH * layoutScale;
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const dx = cx - GLOBE_VIEW.cx * layoutScale;
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const dy = cy - GLOBE_VIEW.cy * layoutScale;
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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(globeImg, 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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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');
|
||
stage.appendChild(canvas);
|
||
|
||
const urls = {
|
||
globe: hubAsset('assets/hub-logo-fragment-globe.svg', build),
|
||
continents: hubAsset('assets/hub-logo-continents-mercator-globe.svg', build),
|
||
mercatorFlat: hubAsset('assets/hub-logo-continents-mercator-flat.svg', build),
|
||
};
|
||
|
||
let globeImg;
|
||
let continentsImg;
|
||
let mercatorFlatImg;
|
||
try {
|
||
[globeImg, continentsImg, mercatorFlatImg] = await Promise.all([
|
||
loadImage(urls.globe),
|
||
loadImage(urls.continents),
|
||
loadImage(urls.mercatorFlat),
|
||
]);
|
||
} catch (e) {
|
||
console.warn('HubGlobe: asset load failed', e);
|
||
canvas.remove();
|
||
return null;
|
||
}
|
||
|
||
const globe = rasterizeImage(globeImg, GLOBE_VIEW.imgW, GLOBE_VIEW.imgH, RASTER_SCALE);
|
||
const continents = rasterizeImage(continentsImg, GLOBE_VIEW.imgW, GLOBE_VIEW.imgH, RASTER_SCALE);
|
||
const mercW = (mercatorFlatImg.naturalWidth || 800) * 2;
|
||
const mercH = (mercatorFlatImg.naturalHeight || 519) * 2;
|
||
const mercFlat = rasterizeImage(mercatorFlatImg, mercW, mercH, 1);
|
||
|
||
let rotation = typeof opts.initialRotationY === 'number' ? opts.initialRotationY : 0;
|
||
let angularVelocity = reducedMotion ? 0 : AUTO_SPIN_RAD_S;
|
||
let dragging = false;
|
||
let lastPointerX = 0;
|
||
let lastPointerTime = 0;
|
||
let raf = 0;
|
||
let lastFrame = performance.now();
|
||
|
||
const ctx = canvas.getContext('2d', { willReadFrequently: true });
|
||
|
||
const resize = () => {
|
||
const rect = globeCoverRect();
|
||
const dpr = Math.min(window.devicePixelRatio || 1, 2);
|
||
const px = Math.max(64, Math.floor(rect.width * dpr));
|
||
canvas.style.left = rect.left + 'px';
|
||
canvas.style.top = rect.top + 'px';
|
||
canvas.style.width = rect.width + 'px';
|
||
canvas.style.height = rect.height + 'px';
|
||
canvas.width = px;
|
||
canvas.height = px;
|
||
return { rect, dpr, px };
|
||
};
|
||
|
||
let layout = resize();
|
||
window.addEventListener('resize', () => {
|
||
layout = resize();
|
||
});
|
||
|
||
const render = () => {
|
||
const { rect, dpr, px } = layout;
|
||
const cx = (rect.cx - rect.left) * dpr;
|
||
const cy = (rect.cy - rect.top) * dpr;
|
||
const r = rect.r * dpr;
|
||
const rim = rect.rim * dpr;
|
||
const layoutScale = rect.scale * dpr;
|
||
|
||
ctx.clearRect(0, 0, px, px);
|
||
blitLayer(
|
||
ctx,
|
||
cx,
|
||
cy,
|
||
r,
|
||
fillDiskRegion(ctx, cx, cy, r, rotation, function (tex) {
|
||
return sampleOceanRgba(globe, tex);
|
||
})
|
||
);
|
||
blitLayer(
|
||
ctx,
|
||
cx,
|
||
cy,
|
||
r,
|
||
fillDiskRegion(ctx, cx, cy, r, rotation, function (tex) {
|
||
const l = sampleLandRgba(continents, mercFlat, tex);
|
||
return l || [0, 0, 0, 0];
|
||
})
|
||
);
|
||
drawHubGrid(ctx, cx, cy, r, rotation, layoutScale);
|
||
drawRim(ctx, globeImg, cx, cy, r, rim, layoutScale);
|
||
ctx.save();
|
||
ctx.beginPath();
|
||
ctx.arc(cx, cy, r, 0, Math.PI * 2);
|
||
ctx.strokeStyle = 'rgba(10,14,20,0.55)';
|
||
ctx.lineWidth = Math.max(2, layoutScale * 0.006);
|
||
ctx.stroke();
|
||
ctx.restore();
|
||
};
|
||
|
||
const onPointerDown = (ev) => {
|
||
if (ev.button !== 0) return;
|
||
dragging = true;
|
||
lastPointerX = ev.clientX;
|
||
lastPointerTime = performance.now();
|
||
canvas.setPointerCapture(ev.pointerId);
|
||
canvas.classList.add('is-dragging');
|
||
ev.preventDefault();
|
||
};
|
||
|
||
const onPointerMove = (ev) => {
|
||
if (!dragging) return;
|
||
const now = performance.now();
|
||
const dx = ev.clientX - lastPointerX;
|
||
rotation += dx * DRAG_ROTATION_PER_PX;
|
||
if (now > lastPointerTime) {
|
||
const inst = (dx * DRAG_ROTATION_PER_PX) / ((now - lastPointerTime) / 1000);
|
||
angularVelocity = Math.max(-2.5, Math.min(2.5, inst));
|
||
}
|
||
lastPointerX = ev.clientX;
|
||
lastPointerTime = now;
|
||
ev.preventDefault();
|
||
};
|
||
|
||
const endDrag = (ev) => {
|
||
if (!dragging) return;
|
||
dragging = false;
|
||
canvas.classList.remove('is-dragging');
|
||
try {
|
||
canvas.releasePointerCapture(ev.pointerId);
|
||
} catch (ignored) {}
|
||
};
|
||
|
||
canvas.addEventListener('pointerdown', onPointerDown);
|
||
canvas.addEventListener('pointermove', onPointerMove);
|
||
canvas.addEventListener('pointerup', endDrag);
|
||
canvas.addEventListener('pointercancel', endDrag);
|
||
|
||
const tick = (now) => {
|
||
raf = requestAnimationFrame(tick);
|
||
const dt = Math.min(0.05, (now - lastFrame) / 1000);
|
||
lastFrame = now;
|
||
|
||
if (!dragging) {
|
||
if (!reducedMotion) {
|
||
const target = AUTO_SPIN_RAD_S;
|
||
angularVelocity += (target - angularVelocity) * 1.2 * dt;
|
||
if (Math.abs(angularVelocity - target) < 0.004) angularVelocity = target;
|
||
} else {
|
||
angularVelocity *= Math.exp(-4 * dt);
|
||
}
|
||
rotation += angularVelocity * dt;
|
||
}
|
||
|
||
render();
|
||
};
|
||
|
||
raf = requestAnimationFrame(tick);
|
||
stage.dataset.globe3d = 'active';
|
||
stage.dataset.globeAxis = 'ew-ns-grid';
|
||
|
||
return {
|
||
destroy() {
|
||
cancelAnimationFrame(raf);
|
||
window.removeEventListener('resize', resize);
|
||
canvas.remove();
|
||
delete stage.dataset.globe3d;
|
||
delete stage.dataset.globeAxis;
|
||
},
|
||
};
|
||
}
|