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fix: add comment

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This commit is contained in:
David Nguyen
2024-06-12 14:00:45 +10:00
parent 9fbc61a04d
commit 6174415339
1 changed files with 10 additions and 4 deletions
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14
packages/lib/server-only/pdf/insert-field-in-pdf.ts
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@ -52,8 +52,15 @@ export const insertFieldInPDF = async (pdf: PDFDocument, field: FieldWithSignatu
let { width: pageWidth, height: pageHeight } = page.getSize();
// For landscape pages, swap the width and height so we can calculate item position the same way
// the user placed it in the editor.
// PDFs can have pages that are rotated, which are correctly rendered in the frontend.
// However when we load the PDF in the backend, the rotation is applied.
//
// To account for this, we swap the width and height for pages that are rotated by 90/270
// degrees. This is so we can calculate the virtual position the field was placed if it
// was correctly oriented in the frontend.
//
// Then when we insert the fields, we apply a transformation to the position of the field
// so it is rotated correctly.
if (isPageRotatedToLandscape) {
[pageWidth, pageHeight] = [pageHeight, pageWidth];
}
@ -174,16 +181,15 @@ const adjustPositionForRotation = (
) => {
if (pageRotationInDegrees === 270) {
xPos = pageWidth - xPos;
[xPos, yPos] = [yPos, xPos];
}
if (pageRotationInDegrees === 90) {
yPos = pageHeight - yPos;
[xPos, yPos] = [yPos, xPos];
}
// Invert all the positions since it's rotated by 180 degrees.
if (pageRotationInDegrees === 180) {
xPos = pageWidth - xPos;
yPos = pageHeight - yPos;