[NTG-context] currentreferencerealpage wrong (how to detect even/odd pages?)

Hans Hagen pragma at wxs.nl
Mon Mar 16 11:27:41 CET 2015


On 3/15/2015 8:13 PM, Harald Koenig wrote:
> On Mar 15, Wolfgang Schuster wrote:
>
>>
>>> Am 15.03.2015 um 16:40 schrieb Harald Koenig <koenig at tat.physik.uni-tuebingen.de>:
>>>
>>> Hi,
>>>
>>> right now I use \currentreferencerealpage to detect if I'm on an even or odd page
>>> (because my picture placement rules depend on it) like this:
>>>
>>> \newcount\bildpage
>>> \bildpage=1
>>> % ...
>>> \def\bild#1...{%
>>>      {\global\bildpage=\realpageno}%
>>>      \ifodd\bildpage \def\eo{o}\else \def\eo{e}\fi
>>>      % ...
>>>      \if o\eo odd...\else even...\fi
>>>     \message{>> bildpage=\the\bildpage \space eo=\eo \space currentreferencerealpage=\currentreferencerealpage \space << }%
>>> }
>>>
>>> but now I notice that for some pages/pictures the value of \currentreferencerealpage
>>> is not correct (only for the first picture on a new page?):-(
>>
>> To test whether you’re on a left or right page you can use the \signalrightpage and \doifrightpageelse commands
>
> this doesn't seem to work well -- at least not within \placefigure
>
> I've tried this replacement in my \bild macro which should be equivalent (or better?)
>
> %   \ifodd\bildpage \def\eo{o}\else \def\eo{e}\fi
> %   \ifodd\bildpage \def\lr{r}\else \def\lr{l}\fi
>      \dontleavehmode\signalrightpage
>      \doifrightpageelse{\def\eo{o}}{\def\eo{e}}%
>      \doifrightpageelse{\def\lr{r}}{\def\lr{r}}%
>
> (with and without \dontleavehmode\signalrightpage)
> and now I get more wrong picture placements for the first picture on some pages...

you need to make sure that the signal travels with the stuff you're 
checking

btw, if you use side floats, the inner/outer variants do this auto 
left/right stuff

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