From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Pdf info: width, height and rotation
Date: Thu, 17 Nov 2016 09:51:51 +0100 [thread overview]
Message-ID: <94a35210-4fc8-220a-f211-ed48af29662c@wxs.nl> (raw)
In-Reply-To: <op.yq2cfbh862epfj@lpr>
On 11/17/2016 9:27 AM, Procházka Lukáš Ing. wrote:
> Hello,
>
> two questions about pages in PDF document (slightly refers to the code
> http://www.mail-archive.com/ntg-context@ntg.nl/msg57502.html):
>
> ----
> local MyDocument = lpdf.epdf.load("A4.pdf")
>
> context.starttext()
>
> local pages = MyDocument.pages
> local dummy = MyDocument.pages[1] -- we need lua 5.2 in order to avoid
> this
>
> local nofpages = #MyDocument.pages
>
> context.starttabulate { "|c|c|c|" }
>
> context.NC() context("page")
> context.NC() context("width")
> context.NC() context("height") context.NR()
>
> for i=1, nofpages do
> local page = pages[i]
> local bbox = page.CropBox or page.MediaBox
> context.NC() context(i)
> context.NC() context(bbox[4]-bbox[2])
> context.NC() context(bbox[3]-bbox[1]) context.NR()
> end
>
> context.stoptabulate()
>
> context.stoptext()
> ----
>
> The sample gives: w ~ 842 pt, h ~ 595 pt
>
> Questions:
>
> 1. Shouldn't be width and height swapped? As the analyzed 'A4.pdf' has
> width of 210 mm and height of 297 mm, IOW width < height, whilst the cld
> code gives w > h (?!).
you do that yourself as [3] - [1] is the width while you put it under
height
> 2. Is it possible to get rotation or orientation of the page (be
> "portrait" or "landscape" or "0" or "90" or so)?
if it's in a dictionary you can locate it query the value
> 3. Is the 'bbox' already affected by the page rotation/orientation? I
> mean - in the case page orientation is 90 or 270, is the width and
> height of 'bbox' swapped compared to the situation if page orientation
> was 0 (or 180)?
I don't know.
> Best regards,
>
> Lukas
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
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> ___________________________________________________________________________________
>
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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next prev parent reply other threads:[~2016-11-17 8:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-17 8:27 Procházka Lukáš Ing.
2016-11-17 8:51 ` Hans Hagen [this message]
2016-11-17 9:16 ` Procházka Lukáš Ing.
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