Re: deprecated startMPenvironment

[Wolfgang Schuster <schuster.wolfgang@gmail.com>]

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> Meer, Hans van der <mailto:H.vanderMeer@uva.nl>
> 4. April 2016 um 11:48
>
>
>> On 04 Apr 2016, at 00:12, Hans Hagen <pragma@wxs.nl 
>> <mailto:pragma@wxs.nl>> wrote:
>>
>> On 4/3/2016 4:07 PM, Meer, Hans van der wrote:
>>> Previously I could do the following
>>>
>>> \starttext
>>> \startMPenvironment[+]\switchtobodyfont[small]\stopMPenvironment
>>> \startMPpage
>>> % metafont code
>>> \stopMPpage
>>> \stoptext
>>> \endinput
>>>
>>> This is called by context --run --once etc. producing the figure and 
>>> in this case modifying the font to a smaller size. Note, the context 
>>> call occurs on the fly inside a \directlua{{os.execute(..)}. You may 
>>> find this complicated, but it works for me and I would rather like 
>>> not having to change may things all over the place.
>>>
>>> Now I learn from the ConTeXtgarden that startMPenvironment is 
>>> deprecated and that I should use defineMPinstance and 
>>> setupMPinstance instead.
>>> Thus I tried
>>>
>>> \defineMPinstance[mp:local][metafun][setups=mp:smallfont,textcolor=red]
>>> \startsetups mp:smallfont
>>> \switchtobodyfont[small]
>>> \stopsetups
>>> \startMPpage  and also \startMPpage[mp:local]
>>> % metafont code
>>> \stopMPpage
>>> \stoptext
>>> \endinput
>>>
>>> But nothing happens. How do I get the effect earlier obtained with 
>>> startMPenvironment without having to rely an a deprecated macro?
>>
>> the bodyfont environment was needed because we had to communicate to 
>> the external mp run what the intended settings were
>> in mkiv the run is internal so the mp text generator adapts to the 
>> current settings and there is no need to pass anything
>>
>
> Indeed, I can see the effect of mp functioning inside mkiv. But there 
> is still something I do not understand.
>
> I get small italic text doing this:
>
>     \startMPenvironment[+]
>     \switchtobodyfont[small]
>     \it
>     \stopMPenvironment
>
>
> But italic only doing:
>
>     %\startMPenvironment[+]
>     \switchtobodyfont[small]
>     \it
>     %\stopMPenvironment
>
>
> How is that possible?
Please send complete examples and not only snippets.

Wolfgang

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