Issues calculating viewer coordinates for a rotated PDF page.

[sameer-roofr]

I have a service that accepts annotations with coordinates and dimensions and places them on a PDF page. Standard functions like page.drawRectangle and pdfPage.drawText work correctly with some adjustments. However, when working with a rotated PDF page, I am facing challenges.

Specifically, the PDF coordinates and viewer coordinates differ, which is expected. To address this, I wrote a wrapper function to convert PDF coordinates to viewer coordinates. However, I noticed that when a PDF page is rotated, the library still returns the original (unrotated) dimensions via page.getSize(). For example, if a rotated page appears as 1000x800 in the viewer, page.getSize() still returns 800x1000 (its original dimensions at 0 degrees).

Is there a way to get the viewer coordinates or the correctly rotated dimensions for a PDF page instead of the original unrotated values?

tldr; I want to know how to get viewer coordinates, origin (0,0) is top-left, for rotated PDF pages.