st.pdf/layout.js at main · ma-serra/st.pdf · GitHub

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export function getPageSizeMm(sizeKey) {
  // ISO sizes in mm; Letter/Legal in mm
  switch ((sizeKey || "a4").toLowerCase()) {
    case "a4": return { w: 210, h: 297 };
    case "letter": return { w: 215.9, h: 279.4 };
    case "legal": return { w: 215.9, h: 355.6 };
    default: return { w: 210, h: 297 };
  }
}

export function getSlots(layoutKey, pageW, pageH, margin) {
  const innerW = pageW - margin * 2;
  const innerH = pageH - margin * 2;

  function centerSlot() {
    return [{ x: margin, y: margin, w: innerW, h: innerH }];
  }

  // helper to build a grid with gap
  function makeGrid(cols, rows, gapRatio = 0.016) {
    const gap = Math.min(innerW, innerH) * gapRatio;
    const totalGapW = gap * (cols - 1);
    const totalGapH = gap * (rows - 1);
    const w = (innerW - totalGapW) / cols;
    const h = (innerH - totalGapH) / rows;
    const arr = [];
    for (let r = 0; r < rows; r++) {
      for (let c = 0; c < cols; c++) {
        arr.push({
          x: margin + c * (w + gap),
          y: margin + r * (h + gap),
          w, h
        });
      }
    }
    return arr;
  }

  switch (layoutKey) {
    case "1_center":
      return centerSlot();

    case "2_row": {
      const gap = Math.min(innerW, innerH) * 0.02;
      const w = (innerW - gap) / 2;
      const h = innerH;
      return [
        { x: margin, y: margin, w, h },
        { x: margin + w + gap, y: margin, w, h }
      ];
    }

    case "3_row": {
      const gap = Math.min(innerW, innerH) * 0.02;
      const w = (innerW - gap * 2) / 3;
      const h = innerH;
      return [
        { x: margin, y: margin, w, h },
        { x: margin + w + gap, y: margin, w, h },
        { x: margin + 2 * (w + gap), y: margin, w, h }
      ];
    }

    case "3_col": {
      const gap = Math.min(innerW, innerH) * 0.02;
      const w = innerW;
      const h = (innerH - gap * 2) / 3;
      return [
        { x: margin, y: margin, w, h },
        { x: margin, y: margin + h + gap, w, h },
        { x: margin, y: margin + 2 * (h + gap), w, h }
      ];
    }

    case "4_grid":
      return makeGrid(2, 2, 0.02);

    case "5_col": {
      const gap = Math.min(innerW, innerH) * 0.015;
      const w = innerW;
      const h = (innerH - gap * 4) / 5;
      return Array.from({ length: 5 }, (_, i) => ({
        x: margin,
        y: margin + i * (h + gap),
        w, h
      }));
    }

    case "6_grid":
      return makeGrid(3, 2, 0.018);

    case "hero": {
      const gap = Math.min(innerW, innerH) * 0.025;
      const heroW = innerW * 0.62;
      const heroH = innerH * 0.62;
      const heroX = margin + (innerW - heroW) / 2;
      const heroY = margin + (innerH - heroH) / 2;
      const sideW = (innerW - heroW - gap * 3) / 2;
      const sideH = (innerH - gap * 3) / 2;
      return [
        { x: heroX, y: heroY, w: heroW, h: heroH }, // main
        { x: margin + gap, y: margin + gap, w: sideW, h: sideH },
        { x: margin + gap + sideW + gap + heroW + gap > margin + innerW ? margin + gap : heroX + heroW + gap, y: margin + gap, w: sideW, h: sideH },
        { x: margin + gap, y: margin + gap + sideH + gap, w: sideW, h: sideH },
        { x: heroX + heroW + gap, y: margin + gap + sideH + gap, w: sideW, h: sideH }
      ];
    }

    case "mosaic": {
      // Simple mosaic with varied tile sizes (fills area pleasantly)
      const gap = Math.min(innerW, innerH) * 0.02;
      const colW = (innerW - gap) / 2;
      const rowH = (innerH - gap * 2) / 3;

      return [
        { x: margin, y: margin, w: colW, h: rowH * 2 + gap },                   // tall left
        { x: margin + colW + gap, y: margin, w: colW, h: rowH },                 // small top-right
        { x: margin + colW + gap, y: margin + rowH + gap, w: colW, h: rowH },    // small mid-right
        { x: margin, y: margin + (rowH * 2 + gap) + gap, w: colW, h: rowH },     // small bottom-left
        { x: margin + colW + gap, y: margin + (rowH * 2 + gap) - rowH, w: colW, h: rowH * 2 + gap } // tall bottom-right
      ];
    }

    case "4x3":
      return makeGrid(4, 3, 0.012);

    case "3x4":
      return makeGrid(3, 4, 0.012);

    case "4x4":
      return makeGrid(4, 4, 0.01);

    case "4x5":
      return makeGrid(4, 5, 0.008);

    case "4x6":
      return makeGrid(4, 6, 0.006);

    default:
      return centerSlot();
  }
}