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Re: PageSize v. BoundingBox

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In article <slrnnll8f1.5c2.peter@box8.pjb.com.au>, peter@www.pjb.com.au 
says...
> 
> Hi.
>   currentpagedevice (PageSize) get ==
> prints out:
>   [594.672 841.829956]
> i.e. A4 in point.  Now if I add a:
>   %%BoundingBox: 0 0 75 37.5
> line, I would expect it to print [75 37.5] ; but it doesn't, gs
> prints [594.672 841.829956] as before, which doesn't seem useful :-(

As Carlos already pointed out, comments are just comments (any line 
beginning '%' is a comment), PostScript interpreters ignore comments. 
DSC comments are present for DSC parsers to handle, In particular they 
are used when an application imports an EPS into its content.

If you want to alter the media size the you need the setpagedevice 
operator. Eg:

<</PageSize [75 37.5]>> setpagedevice

will request media which is 75x37.5 points (ie very small, approx 1 inch 
by half an inch). You can also use -dDEVICEWIDTHPOINTS and -
dDEVICEHEIGHTPOINTS, the -g switch, and possibly some other ways that 
I've forgottten about. In short, there are lots of ways to set the media 
size, but comments aren't one of them.

 
> Is there a way from within the code of finding the BoundingBox size?

If your file is an EPS file then -dEPSCrop will crop the media to the 
declared BoundingBox. There is also a rudimentary DSC parser available 
in Ghostscript, you can find more about it in the documentation.

If you want to know the actual bounding box of a random piece of 
PostScript you can use Ghostscript's bbox device which will tell you.


			Ken

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Thread

PageSize v. BoundingBox Peter Billam <peter@www.pjb.com.au> - 2016-06-10 11:17 +0000
  Re: PageSize v. BoundingBox Carlos <angus@quovadis.com.ar> - 2016-06-10 15:00 +0200
  Re: PageSize v. BoundingBox ken <ken@spamcop.net> - 2016-06-10 17:22 +0100
    Re: PageSize v. BoundingBox Peter Billam <peter@www.pjb.com.au> - 2016-06-11 01:55 +0000
      Re: PageSize v. BoundingBox Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-10 19:18 -0700
        Re: PageSize v. BoundingBox Peter Billam <peter@www.pjb.com.au> - 2016-06-11 02:43 +0000
          Re: PageSize v. BoundingBox jdaw1 <jdawiseman@gmail.com> - 2016-06-12 02:37 -0700

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