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fix(po): centre signature over name; stamp to its right and behind it
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In the XLSX signatory block, place the approver signature centred over the
name and tuck the stamp to its right with a slight overlap. The stamp is now
drawn before the signature so it layers behind it (Excel z-order = add order).

Images are positioned by absolute pixels via native EMU offsets — ExcelJS's
fractional-column anchors don't map cleanly to pixels (the stamp was landing
on top of the signature centre instead of to its right). Verified in a real
export: signature centre 252px in the 503px A-D block (centred), stamp to the
right (305-372px), stamp drawn behind the signature.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hardik 2026-06-21 13:45:56 +05:30
parent 6677ef4fcf
commit 610c9aa56d
1 changed files with 40 additions and 18 deletions
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58
App/app/api/po/[id]/export/route.ts
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@ -459,14 +459,49 @@ export async function GET(request: NextRequest, { params }: Props) {
ws.getRow(SIG_ROW + 1).height = 14;
ws.getRow(SIG_ROW + 2).height = 14;
// Left sig block (approver — the manager who authorized the PO)
if (signatureBase64) {
// Left signatory block (cols A-D). Position images by absolute pixels via native
// EMU offsets — ExcelJS's fractional-column anchors don't map cleanly to pixels.
const EMU = 9525; // EMU per pixel
const COL_PX = [22, 4, 28, 15, 8, 15, 15, 8, 16].map((w) => Math.round(w * 7 + 5));
const SIG_BLOCK_PX = COL_PX[0] + COL_PX[1] + COL_PX[2] + COL_PX[3]; // A-D
const anchorAt = (leftPx: number, row: number) => {
let x = 0;
for (let c = 0; c < COL_PX.length - 1; c++) {
if (leftPx < x + COL_PX[c]) {
return { nativeCol: c, nativeColOff: Math.round((leftPx - x) * EMU), nativeRow: row, nativeRowOff: 0 } as unknown as ExcelJS.Anchor;
}
x += COL_PX[c];
}
return { nativeCol: COL_PX.length - 1, nativeColOff: Math.round((leftPx - x) * EMU), nativeRow: row, nativeRowOff: 0 } as unknown as ExcelJS.Anchor;
};
const sigExt = signatureBase64 ? scaleToBox(signatureSize ?? { width: 360, height: 96 }, 165, 44) : null;
const sigLeft = sigExt ? Math.round((SIG_BLOCK_PX - sigExt.width) / 2) : 0; // centred over the name
// Stamp / seal — drawn FIRST so it sits BEHIND the signature, tucked to its right.
if (stampImg) {
const stampExt = scaleToBox(stampImg, 80, 66);
const stampLeft = sigExt
? Math.min(SIG_BLOCK_PX - stampExt.width, sigLeft + sigExt.width - Math.round(stampExt.width * 0.35))
: SIG_BLOCK_PX - stampExt.width - 6;
const stampId = wb.addImage({
base64: stampImg.base64,
extension: stampImg.mime === "image/jpeg" ? "jpeg" : "png",
});
ws.addImage(stampId, {
tl: anchorAt(Math.max(0, stampLeft), SIG_ROW - 1),
ext: stampExt,
editAs: "oneCell",
});
}
// Approver signature — drawn AFTER the stamp (on top), centred over the name.
if (signatureBase64 && sigExt) {
const imgType = signatureMime === "image/jpeg" ? "jpeg" : "png";
const imgId = wb.addImage({ base64: signatureBase64, extension: imgType });
// Sized by pixels (aspect preserved) and placed inside the signatory box
ws.addImage(imgId, {
tl: { col: 0.4, row: SIG_ROW - 1 } as unknown as ExcelJS.Anchor,
ext: scaleToBox(signatureSize ?? { width: 360, height: 96 }, 165, 44),
tl: anchorAt(Math.max(0, sigLeft), SIG_ROW - 1),
ext: sigExt,
editAs: "oneCell",
});
sc(SIG_ROW, 1, "", { border: { top: thin(), left: thin(), right: thin() } });
@ -485,19 +520,6 @@ export async function GET(request: NextRequest, { params }: Props) {
ws.getRow(SIG_ROW + 2).height = 14;
ws.getRow(SIG_ROW + 3).height = 14;
// Company stamp / seal — overlays the right of the approver's signatory block (aspect preserved)
if (stampImg) {
const stampId = wb.addImage({
base64: stampImg.base64,
extension: stampImg.mime === "image/jpeg" ? "jpeg" : "png",
});
ws.addImage(stampId, {
tl: { col: 2.35, row: SIG_ROW - 1 } as unknown as ExcelJS.Anchor,
ext: scaleToBox(stampImg, 80, 66),
editAs: "oneCell",
});
}
// Right sig block (vendor)
const vName = po.vendor?.name ?? "";
sc(SIG_ROW, 6, vName, { font: fBold, border: { top: thin(), left: thin(), right: thin() }, align: alignC });