[NTG-context] fluctuating baseline of header text

Hans Hagen pragma at wxs.nl
Sat Dec 27 13:36:49 CET 2014


On 12/27/2014 12:16 PM, j. van den hoff wrote:
> On Sat, 27 Dec 2014 10:40:30 +0100, Pablo Rodriguez <oinos at gmx.es> wrote:
>
>> On 12/26/2014 11:32 PM, j. van den hoff wrote:
>>> [...]
>>> in this example (and with this font) the problem is only occuring when
>>> toggling between pages 6/7 or 7/8 (at sufficient zoom it's easy to see),
>>> i.e.the header is shifted downward on page 7. in other docs with
>>> different
>>> fonts it happens across multiple pages. my guess would be it has to
>>> do with the digit heights in the different fonts and the fact that the
>>> page numbers are much larger than the heading, but that's only a guess.
>>>
>>> can someone confirm the problem?
>>
>> Hi Jörg,
>>
>> this sample shows the issue without zooming:
>
> thanks for confirming this. @devs: can this be considered "misbehaviour"
> (not to call it a bug ;-)) or is it somehow unavoidable?

it's not a bug at all .. you just get what you ask for

\showframe \showglyphs

your header is too small so what you want only works if the heights  of 
all characters are the same which is not the case here

solutions:

- use a proper height for the header
- package the header text in a box and set the height of that box

>>
>>     \setuppapersize[A8]
>>     \setupheader      [style=\itx\ss]
>>     \setupheadertexts [section]
>>     \setuppagenumbering[location={header,margin}, style=\bfd]
>>     \starttext
>>     \dorecurse{80}{\section{Introduction}
>>     bla\page[yes]}
>>     \stoptext
>>
>> When the glyph 7 is involved in page number, baseline is a bit lower. As
>> you wrote, I guess this is related with the glyph metrics.
>
> yes. this seems to be supported by the fact that it happens differently
> (usually more frequently) with other fonts.
>
> joerg
>
>>
>> Just in case it helps,
>>
>>
>> Pablo
>
>


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