I am using pdfium to handle converting a pdf to a designer.cs file for winforms.

Conversion of pdfium points to winform pixels. The direct conversion seems to work only for left and right coordinates and not the top / bottom coordinates.


Example:

I have a control who's points are L:270.96, B:684.24, R: 383.16, T:699.6 in pdfium

Converting the Right and Left points using 1.3 (96/72)

L to px => 270.96 pt * 1.3 px/pt = 352.25px
R to px => 383.16 pt * 1.3 px/pt = 498.11px

This conversion equal(given +/- 3 px) the correct L and R values.

When converting Top and Bottom from pt to px
Top to px => 699.6 pt * 1.3 px/pt = 909.48 px
Bottom to px => 684.24 * 1.3 px/pt = 889.51 px

The values I expect for Top is 122 and Bottom are 142. My assumption is pdfium uses a different quadrant system then what winforms uses. I believe winform uses the top left as the origin with values increasing as the move away from the origin.

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Is there a way to convert the top and bottom coordinates from pdfium into winform coordinates?

Try to use PdfViewer.PageToClient() or, if PdfViewer is not used in your App, then PdfPage.PageToDevice().