TeX macro to MP variable

TeX macro to MP variable

[Marco Patzer]

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Hi,

I am looking for a way to assign the value of a TeX macro to an MP variable.
However, this only works the first time, then the value is not updated any
longer. Example:

\startMPdefinitions
  size = \somesize ;
\stopMPdefinitions

\startuseMPgraphic{alpha}
  fill unitcircle scaled size;
\stopuseMPgraphic

\starttext
  \def\somesize{1cm}
  \useMPgraphic{alpha} %% diameter = 1cm

  \def\somesize{2cm}
  \useMPgraphic{alpha} %% diameter = 1cm
\stoptext

I looked into \setupMPvariables, but I couldn't manage to assign them to an
MP variable. The setups key from \defineMPinstance seems to to the job, but
it's TeX, not MetaPost. What comes to mind is a \processMPbuffer before
every MPgraphic:

\startbuffer[foo]
  size := \somesize ;
\stopbuffer

\startuseMPgraphic{alpha}
  fill unitcircle scaled size;
\stopuseMPgraphic

\starttext
  \def\somesize{1cm}
  \processMPbuffer[foo]
  \useMPgraphic{alpha} %% diameter = 1cm

  \def\somesize{2cm}
  \processMPbuffer[foo]
  \useMPgraphic{alpha} %% diameter = 2cm
\stoptext

Is there a better way?

Marco

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Re: TeX macro to MP variable

[Thomas A. Schmitz]

On 03/16/2013 04:07 PM, Marco Patzer wrote:
> Hi,
>
> I am looking for a way to assign the value of a TeX macro to an MP variable.
> However, this only works the first time, then the value is not updated any
> longer. Example:

I'm not quite sure if this is what you're looking for, but here is an 
example how you could do this with \MPvars:

\def\Circlediameter{15mm}

\def\setupCircle#1[#2]%
   {\getparameters[Circle][diameter=15mm,#2]}

\setupMPvariables
     [mycircle]
     [diameter=\Circlediameter,
]

\startuseMPgraphic{mycircle}
   fill unitcircle scaled \MPvar{diameter} withcolor red ;
\stopuseMPgraphic

\starttext

\useMPgraphic{mycircle}

\blank[1cm]

\setupCircle[diameter=5cm]

\useMPgraphic{mycircle}

\blank[1cm]

\setupCircle[diameter=0.5cm]

\useMPgraphic{mycircle}

\stoptext

Thomas
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Re: TeX macro to MP variable

[Marco Patzer]

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On 2013–03–16 Thomas A. Schmitz wrote:

> I'm not quite sure if this is what you're looking for, but here is
> an example how you could do this with \MPvars:
> 
> \def\Circlediameter{15mm}
> 
> \def\setupCircle#1[#2]%
>   {\getparameters[Circle][diameter=15mm,#2]}
> 
> \setupMPvariables
>     [mycircle]
>     [diameter=\Circlediameter,
> ]
> 
> \startuseMPgraphic{mycircle}
>   fill unitcircle scaled \MPvar{diameter} withcolor red ;
> \stopuseMPgraphic

The above works in the larger document, but a construct like this
fails:

\startuseMPgraphic{mycircle}
  mysize := \MPvar{diameter};
  fill unitcircle scaled mysize withcolor red ;
\stopuseMPgraphic

However, in the minimal example it works, too. So the problem lies
be somewhere else. I will investigate why it fails. I like the MPvar
solution and try to get it working. Thanks

Marco

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Re: TeX macro to MP variable

[Marco Patzer]

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On 2013–03–16 Thomas A. Schmitz wrote:

> \setupMPvariables
>     [mycircle]
>     [diameter=\Circlediameter,
> ]

MPvariables are local to a particular MP graphic. I need a way to
set the variables global to all MPgraphics of that MP instance.

Marco

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Re: TeX macro to MP variable

[Wolfgang Schuster]

Am 16.03.2013 um 17:13 schrieb Marco Patzer <homerow@lavabit.com>:

> On 2013–03–16 Thomas A. Schmitz wrote:
> 
>> \setupMPvariables
>>    [mycircle]
>>    [diameter=\Circlediameter,
>> ]
> 
> MPvariables are local to a particular MP graphic. I need a way to
> set the variables global to all MPgraphics of that MP instance.

http://www.ntg.nl/pipermail/ntg-context/2013/071538.html

Wolfgang
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Re: TeX macro to MP variable

[Marco Patzer]

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On 2013–03–16 Wolfgang Schuster wrote:

> http://www.ntg.nl/pipermail/ntg-context/2013/071538.html

Well, I played with all possible environments, but there is no
environment local to a particular MP instance which is re-read on
every MP graphic. The only usable environment in this case is
MPinitializations, but the values affect all MP instances.

I will settle for MPinitializations until I find a better solution,
it allows for a cleaner code compared to the MPbuffer workaround.
But still, I would prefer to have the setting non-global.

Marco

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Re: TeX macro to MP variable

[Aditya Mahajan]

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On Sat, 16 Mar 2013, Marco Patzer wrote:

> On 2013–03–16 Thomas A. Schmitz wrote:
>
>> \setupMPvariables
>>     [mycircle]
>>     [diameter=\Circlediameter,
>> ]
>
> MPvariables are local to a particular MP graphic. I need a way to
> set the variables global to all MPgraphics of that MP instance.

See the visualcounter module for an alternative way to pass values from 
TeX to MP. Basically, I define a namespace and then just access the 
parameters at MP end using

somvar := \....parameter{...};

etc.

Aditya

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Re: TeX macro to MP variable

[Marco Patzer]

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On 2013–03–16 Aditya Mahajan wrote:

> See the visualcounter module for an alternative way to pass values
> from TeX to MP.

I see, you create an initialisation graphic and include it where
necessary. And it's local to the MP instance. Thanks for the
pointer.

Marco

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Re: TeX macro to MP variable

[Hans Hagen]

On 3/16/2013 4:07 PM, Marco Patzer wrote:
> Hi,
>
> I am looking for a way to assign the value of a TeX macro to an MP variable.
> However, this only works the first time, then the value is not updated any
> longer. Example:
>
> \startMPdefinitions
>    size = \somesize ;
> \stopMPdefinitions
>
> \startuseMPgraphic{alpha}
>    fill unitcircle scaled size;
> \stopuseMPgraphic
>
> \starttext
>    \def\somesize{1cm}
>    \useMPgraphic{alpha} %% diameter = 1cm
>
>    \def\somesize{2cm}
>    \useMPgraphic{alpha} %% diameter = 1cm
> \stoptext
>
> I looked into \setupMPvariables, but I couldn't manage to assign them to an
> MP variable. The setups key from \defineMPinstance seems to to the job, but
> it's TeX, not MetaPost. What comes to mind is a \processMPbuffer before
> every MPgraphic:
>
> \startbuffer[foo]
>    size := \somesize ;
> \stopbuffer
>
> \startuseMPgraphic{alpha}
>    fill unitcircle scaled size;
> \stopuseMPgraphic
>
> \starttext
>    \def\somesize{1cm}
>    \processMPbuffer[foo]
>    \useMPgraphic{alpha} %% diameter = 1cm
>
>    \def\somesize{2cm}
>    \processMPbuffer[foo]
>    \useMPgraphic{alpha} %% diameter = 2cm
> \stoptext
>
> Is there a better way?

grep for \includeMPgraphic



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Re: TeX macro to MP variable

[Marco Patzer]

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On 2013–03–16 Hans Hagen wrote:

> >Is there a better way?
> 
> grep for \includeMPgraphic

Well, I know \includeMPgraphic but the combination of
\includeMPgraphic and \MPvar is very creative, indeed. But it's a
little tricky to find out what code actually gets included.

Obviously there are plenty of solutions to pass from TeX to MP.

Marco

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