beta: figure boundingbox

beta: figure boundingbox

[Peter Rolf]

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Hi,

while comparing the PDF of mkii and mkiv I noticed a slight differ in 
the boundingboxes (bb) of MP figures.
While all mkii bb have the form [0 0 w h], the mkiv counterparts use [-1 
-1 w+1 h+1]. So the bb of mkiv is enlarged 1bp in all directions. Is 
this intended?

Minimal example and PDF attached. (ConTeXt 2009-04-06; luatex0.37; 
pdftex1.40.9; mpost1.102)


Best wishes, Peter

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\pdfcompresslevel0

\setuppagenumber[state=stop]

\startuniqueMPgraphic{foo}
  fill unitsquare xyscaled(2in,1in);  
\stopuniqueMPgraphic

\starttext
\null
\useMPgraphic{foo}
\stoptext

[-- Attachment #3: bb_mkii.pdf --]
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[-- Attachment #4: bb_mkiv.pdf --]
[-- Type: application/pdf, Size: 1803 bytes --]

[-- Attachment #5: Type: text/plain, Size: 487 bytes --]

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Re: beta: figure boundingbox

[Hans Hagen]

Peter Rolf wrote:
> Hi,
> 
> while comparing the PDF of mkii and mkiv I noticed a slight differ in 
> the boundingboxes (bb) of MP figures.
> While all mkii bb have the form [0 0 w h], the mkiv counterparts use [-1 
> -1 w+1 h+1]. So the bb of mkiv is enlarged 1bp in all directions. Is 
> this intended?

harmless ... it prevents clipping of lines

\setbox0\hbox{\useMPgraphic{foo}}
\the\wd0 \the\dimexpr2in\relax
\box0

the real dimensions and positioning is ok




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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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___________________________________________________________________________________

Re: beta: figure boundingbox

[Peter Rolf]

Hans Hagen schrieb:
> Peter Rolf wrote:
>> Hi,
>>
>> while comparing the PDF of mkii and mkiv I noticed a slight differ in 
>> the boundingboxes (bb) of MP figures.
>> While all mkii bb have the form [0 0 w h], the mkiv counterparts use 
>> [-1 -1 w+1 h+1]. So the bb of mkiv is enlarged 1bp in all directions. 
>> Is this intended?
>
> harmless ... it prevents clipping of lines
mh, you mean if something is \framed (with default frame settings)?

>
> \setbox0\hbox{\useMPgraphic{foo}}
> \the\wd0 \the\dimexpr2in\relax
> \box0
>
> the real dimensions and positioning is ok
>
i haven't seen any problems here so far and my default unit (px) is 
smaller than one bp. i was just wondering.... :)
thx for the info.

>
>
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________ 
>
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

___________________________________________________________________________________
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://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: beta: figure boundingbox

[Hans Hagen]

Peter Rolf wrote:
> Hans Hagen schrieb:
>> Peter Rolf wrote:
>>> Hi,
>>>
>>> while comparing the PDF of mkii and mkiv I noticed a slight differ in 
>>> the boundingboxes (bb) of MP figures.
>>> While all mkii bb have the form [0 0 w h], the mkiv counterparts use 
>>> [-1 -1 w+1 h+1]. So the bb of mkiv is enlarged 1bp in all directions. 
>>> Is this intended?
>>
>> harmless ... it prevents clipping of lines
> mh, you mean if something is \framed (with default frame settings)?

if the bbox goes through the middle of a line in an xform then you get 
(in acrobat) clipped lines so this avoids that problem


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________