[NTG-context] chapter counter?

[NTG-context] chapter counter?

[Henning Hraban Ramm]

Hi,
I’d like to check the chapter number like

\ifodd\rawcountervalue[chapter]
What an odd chapter!
\fi

but apparently the counter isn’t called "chapter", or I’m doing it wrong 
otherwise.
Could you enlighten me?

Hraban
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[NTG-context] Re: chapter counter?

[Wolfgang Schuster]

Henning Hraban Ramm schrieb am 26.08.2024 um 17:41:
> Hi,
> I’d like to check the chapter number like
> 
> \ifodd\rawcountervalue[chapter]
> What an odd chapter!
> \fi
> 
> but apparently the counter isn’t called "chapter", or I’m doing it wrong 
> otherwise.
> Could you enlighten me?

\namedheadnumber{chapter}

Wolfgang
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[NTG-context] Re: chapter counter?

[Aditya Mahajan]

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On Mon, 26 Aug 2024, Henning Hraban Ramm wrote:

> Hi,
> I’d like to check the chapter number like
> 
> \ifodd\rawcountervalue[chapter]
> What an odd chapter!
> \fi
> 
> but apparently the counter isn’t called "chapter", or I’m doing it wrong
> otherwise.
> Could you enlighten me?

You need: \somenamedheadnumber{chapter}{current}


    \starttext

    \startsection[title=First]
    This is: \somenamedheadnumber{section}{current}

    \ifodd\somenamedheadnumber{section}{current}\relax
      This is odd
    \else
      This is even
    \fi
      
    \stopsection

    \startsection[title=Second]
    This is: \somenamedheadnumber{section}{current}

    \ifodd\somenamedheadnumber{section}{current}\relax
      This is odd
    \else
      This is even
    \fi
      
    \stopsection


    \stoptext


Aditya

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[NTG-context] Re: chapter counter?

[Henning Hraban Ramm]

Am 26.08.24 um 17:57 schrieb Wolfgang Schuster:
> Henning Hraban Ramm schrieb am 26.08.2024 um 17:41:
>> Hi,
>> I’d like to check the chapter number like
>>
>> \ifodd\rawcountervalue[chapter]
>> What an odd chapter!
>> \fi
>>
>> but apparently the counter isn’t called "chapter", or I’m doing it 
>> wrong otherwise.
>> Could you enlighten me?
> 
> \namedheadnumber{chapter}

Thank you, but it doesn’t work in my setup where I’m trying to change a 
background image depending on the chapter number:

\defineoverlay[BG][\start
\ifodd\namedheadnumber{chapter}\relax
\externalfigure[bgimage][height=\overlayheight]
\else
\mirror{\externalfigure[bgimage][height=\overlayheight]}
\fi
\stop]

This is then used with

\setlayerframed[papier][background=BG]

I guess it’s expanded only once.

But it was a bad idea anyway, I wanted more than two variants and now 
just set them as a uservariable.

Sorry for the effort.

Hraban
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[NTG-context] Re: chapter counter?

[Henning Hraban Ramm]

Am 26.08.24 um 17:58 schrieb Aditya Mahajan:
> On Mon, 26 Aug 2024, Henning Hraban Ramm wrote:
> 
>> Hi,
>> I’d like to check the chapter number like
>>
>> \ifodd\rawcountervalue[chapter]
>> What an odd chapter!
>> \fi
>>
>> but apparently the counter isn’t called "chapter", or I’m doing it wrong
>> otherwise.
>> Could you enlighten me?
> 
> You need: \somenamedheadnumber{chapter}{current}

Thank you, esp. for the effort!

See my other mail – expansion got into my way, and I found a different 
solution.

Hraban
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[NTG-context] Re: chapter counter?

[Wolfgang Schuster]

Henning Hraban Ramm schrieb am 26.08.2024 um 20:14:
> Am 26.08.24 um 17:57 schrieb Wolfgang Schuster:
>> Henning Hraban Ramm schrieb am 26.08.2024 um 17:41:
>>> Hi,
>>> I’d like to check the chapter number like
>>>
>>> \ifodd\rawcountervalue[chapter]
>>> What an odd chapter!
>>> \fi
>>>
>>> but apparently the counter isn’t called "chapter", or I’m doing it 
>>> wrong otherwise.
>>> Could you enlighten me?
>>
>> \namedheadnumber{chapter}
> 
> Thank you, but it doesn’t work in my setup where I’m trying to change a 
> background image depending on the chapter number:
> 
> \defineoverlay[BG][\start
> \ifodd\namedheadnumber{chapter}\relax
> \externalfigure[bgimage][height=\overlayheight]
> \else
> \mirror{\externalfigure[bgimage][height=\overlayheight]}
> \fi
> \stop]
> 
> This is then used with
> 
> \setlayerframed[papier][background=BG]
> 
> I guess it’s expanded only once.
> 
> But it was a bad idea anyway, I wanted more than two variants and now 
> just set them as a uservariable.

Without more information there is no way to provide a solution but for 
the archive there is below a solution to get mirrored images for even 
chapters. The background has also a check an image before the start of 
the first chapter.

\setupexternalfigure[location=default]

\defineoverlay
   [BackGround]
   [\ifzeronum\namedheadnumber{chapter}\relax
      %
    \orelse\ifodd\namedheadnumber{chapter}\relax
      \externalfigure[mill][factor=min]%
    \else
      \mirror{\externalfigure[mill][factor=min]}%
    \fi]

\setupbackgrounds[page][background=BackGround]

\starttext

FooBar

\chapter{Foo}

\chapter{Bar}

\stoptext

Wolfgang
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