At 09:02 AM 7/13/2006, Antoine wrote:
>I am trying to understand the relationship between the mediabox and
>default user space coordinates.
Coords are relative to the origin (bottom left) of the MediaBox.
> Basically, I have a mediabox
>MediaBox[0 0 595 842]. When I open it up in acrobat it tells me thats A4.
OK.
>I see there is a notion of user space which is translated to device
>space by means of the "current transformation matrix". The
>relationshitp between my mediabox and the A4 looks like it is the
>default 72dpi for screen.
Conceptually, yes. It's not really 72dpi, but it's easier
to think of it that way.
The way I teach this to folks is that "if you mentally work
out all your coordinates in 72dpi, then everything 'just works'".
>I was wanting to know (couldn't find it in the spec...) how I make
>sure that there are no non-default ctms being applied so when I read
>MediaBox[0 0 595 842] I know that that means "A4".
The size of the MediaBox is NOT effected by CTM's - it's fixed!
However, the contents of the page can be transformed all it
wants. But it will still be on an A4 page.
Do remember, however, that the MediaBox is the PHYSICAL SIZE
of the page - NOT the VISIBLE SIZE of the page...that's controlled by
the CropBox.
Leonard
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Leonard Rosenthol <mailto:[EMAIL PROTECTED]>
Chief Technical Officer <http://www.pdfsages.com>
PDF Sages, Inc. 215-938-7080 (voice)
215-938-0880 (fax)
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