Screen coordinates to PDF Coordinates

Technical Support Apryse SDK
1

Hi, I have the following issue:

I need to draw images to a PDF file at a specific (x,y) position, but
these images (x,y) positions are given in Screen Coordinate. How can I
convert these screen (x,y) points to PDF Coordinates?

Example: screen size is 1400x1600 and the pdf size is 760x650.

Thanks,

2

In case you are using pdftron.PDF.PDFViewCrtl you can simply use built
in ConvScreenPtToPagePt() to convert from screen coordinates in PDF
view to PDF page coordinate system.

In case you are developing your own control than you need some way to
map screen to PDF page coordinates. This is usually done using a
'device' matrix.

Example: screen size is 1400x1600 and the pdf size is 760x650.

Because PDF is a device independent format you need to know the
resolution (i.e. scaling) at which the image will be drawn. It seems
that you are missing some information. Also are you drawing relative
to lower left corner of the page, or top-left?

As a starting point you may want to take a look at AddImage sample
project.