A gallery guide whose links print as QR codes

const stop = { enabled: true, minHeight: pt(4 * LEAD), slot: { elements: [
    { kind: 'text', id: 'stop', content: '{attr.stop}', ...caps(7.5), color: col('delft'),
      align: 'left', placement: at('container', 'top-left', 0, 0) },
    { kind: 'text', id: 'title', content: '{titleText}', fontFamily: DISPLAY, fontSize: pt(22),
      lineHeight: 1.05, color: col('ink'), align: 'left', placement: at('#stop', 'below', 0, 1.6) },
    { kind: 'text', id: 'artist', content: '{attr.artist}', fontFamily: TEXT, italic: true,
      fontSize: pt(10.5), color: col('muted'), align: 'left',
      placement: at('#title', 'below', 0, 0.8) },
  ] } };

// Paintings are not numbered: their own type, with no caption prefix and no number.
const paintingType = { id: 'painting', name: t({ en: 'Painting', es: 'Cuadro' }),
  shortLabel: t({ en: 'painting', es: 'cuadro' }), captionPrefix: '', numberingTemplate: '',
  resetOn: 'never', counterFormat: 'decimal' };
// Set where the ::resource line stands, under the stop's heading; caption and note beside it.
const HERE = { position: 'here', captionSide: 'inside' };
const cm = (n) => (LANG === 'es' ? String(n).replace('.', ',') : String(n)); // decimal comma
// The wall label: medium, size in cm (no-break spaces) and the museum's credit line.
const painting = (id, w, h, [cmH, cmW], credit, alt, width = 0.5) => ({
  id, typeId: 'painting', kind: 'bitmap', createdAt: 0, updatedAt: 0, placement: { ...HERE, width },
  bitmap: { fileId: `${id}-${Math.max(w, h)}.jpg`, format: 'jpeg', width: w, height: h },
  caption: `${OIL}, ${cm(cmH)}\u00a0×\u00a0${cm(cmW)}\u00a0cm. ${credit}`, altText: alt,
  note: 'The Metropolitan Museum of Art, Open Access (CC0)' });
const OIL = t({ en: 'Oil on canvas', es: 'Óleo sobre lienzo' });
const ALTMAN = t({ en: 'Bequest of Benjamin Altman, 1913', es: 'Legado de Benjamin Altman, 1913' });
const resources = [
  painting('hals', 908, 1200, [105.4, 79.4], `${ALTMAN} (14.40.602)`, t({
    en: 'A laughing young man raises a glass; a young woman leans on his shoulder.',
    es: 'Un joven ríe y alza una copa; una joven se apoya en su hombro.' }), 0.4), // portrait
  painting('steen', 1115, 1200, [141, 131.4], 'Fletcher Fund, 1958 (58.89)', t({
    en: 'A crowded party under a vine, with a lute player, a child and a dog.',
    es: 'Una fiesta concurrida bajo una parra, con un laudista, un niño y un perro.' })),
  painting('rembrandt', 1139, 1200, [143.5, 136.5], t({
    en: 'Purchase, special contributions and funds given or bequeathed by friends of the Museum',
    es: 'Compra con aportaciones y fondos donados o legados por amigos del Museo' })
    + ', 1961 (61.198)', t({ en: 'A bearded man in a black hat rests his hand on a marble bust.',
    es: 'Un hombre barbado con sombrero negro apoya la mano en un busto de mármol.' })),
  painting('vermeer', 1422, 1600, [45.7, 40.6], t({ en: 'Marquand Collection, gift of',
    es: 'Colección Marquand, donación de' }) + ' Henry G. Marquand, 1889 (89.15.21)', t({
    en: 'A young woman at an open window holds a gilt pitcher over a basin.',
    es: 'Una joven junto a una ventana abierta sujeta una jarra dorada sobre una jofaina.' })),
  painting('ruisdael', 1400, 1084, [100, 130.2], `${ALTMAN} (14.40.623)`, t({
    en: 'A sandy road between wheat fields under a tall bank of cloud.',
    es: 'Un camino de arena entre campos de trigo bajo un alto banco de nubes.' }), 0.6),
  // The cover: the Vermeer cut to the box's 4 : 3 (160 × 120 mm), since the opener fits a
  // picture inside its box. Drawn by the cover design, never cited.
  { ...painting('vermeer-cover', 1800, 1350, [], '', t({
    en: 'Detail of Vermeer’s young woman at the window, in blue and white.',
    es: 'Detalle de la joven de Vermeer junto a la ventana, en azul y blanco.' })),
  caption: '', note: '' },
];

const head = (id, content, parity, edge, x, extra = {}) => ({
  kind: 'text', id, content, parity, pages: 'body', ...caps(7, 600), color: col('muted'),
  placement: at('page', edge, x, 13), ...extra,
});
const folio = { ...caps(8, 700), color: col('ink') };
const header = { elements: [
  head('verso-folio', '{pageNumber}', 'even', 'top-left', OUTER, folio),
  head('verso-title', '{title}', 'even', 'top-left', OUTER + 9),
  head('recto-stop', '{firstMark.h2}', 'odd', 'top-right', -(OUTER + 9)),
  head('recto-folio', '{pageNumber}', 'odd', 'top-right', -OUTER, folio),
] };