Re: \centerline vs. \midaligned vs. \startalignment[middle]

["Procházka Lukáš Ing. - Pontex s. r. o." <LPr@pontex.cz>]

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Hello,

thanks for explanation.

I also wrote a sample code which should typeset a midaligned table via Lua using "tabulate".

But I'm not able to achieve the goal - what am I doing wrong?

----
\starttext
   T

   \startluacode
     local f = function()
       context.starttabulate{"|rw(2cm)|rw(2cm)|"}
         context.NC()
         context("A")
         context.NC()
         context("B")
         context.NC()
         context.NR()
       context.stoptabulate()
     end

     f()

     context("U\\par")

     context.startalignment{"middle"}
       context("V") -- OK, "V" is successfully midaligned
     context.stopalignment()

     context.startalignment{"middle"}
       f() -- Wrong, table is not midaligned
     context.stopalignment()

     context.startalignment{"middle"}
       context.dontleavehmode()
       f() -- Wrong, too, table is still not midaligned (?!)
     context.stopalignment()

     -- context.midaligned(f) -- This breaks Ctx!
   \stopluacode
\stoptext
----

Best regards,

Lukas


On Wed, 26 Jun 2013 14:46:32 +0200, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

>
> Am 26.06.2013 um 14:07 schrieb Procházka Lukáš Ing. - Pontex s. r. o. <LPr@pontex.cz>:
>
>> Hello,
>>
>> there are several similar commands to produce text (or another object) to be centered on the line.
>>
>> What are differences (or intended usage) among \centerline, \midaligned, \startalignment[middle]?
>>
>> (NB: \centerline has no its-own page on wiki, but it is used at several places in wiki samples.
>>
>> \centerline was also mentioned here in the mailing list, when I was trying to center "tabulate" - and neither \midaligned nor \startalignment[middle] combined with \dontleavehmode worked.)
>
> The three commands
>
>   - \leftline,
>   - \rightline and
>   - \centerline
>
> are copied from plain TeX and allow you to center short text which fits on a single line but it isn’t recommended to use them because ConTeXt has it’s own alternative for them. The replacement commands are
>
>   - \leftaligned,
>   - \rightaligned and
>   - \midaligned.
>
> Even though each command is only meant for short text you use the \\ command to put text into several lines, e.g.
>
>   \starttext
>   \midaligned{One\\Two\\Three}
>   \stoptext
>
> creates three lines for the input. In recent installations you can write
>
>   \startlinealignment[left|middle|right]
>   …
>   \stopalignment
>
> as a alternative to \leftaligned etc.
>
> With the alignment environment you can change the alignment of the text for a certain region. Unlike the line alignment environment you can use text which covers more than a single line.
>
>   \starttext
>   \input knuth\par
>   \startalignment[middle]
>   \input knuth\par
>   \stopalignment
>   \stoptext
>
> Wolfgang


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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\starttext
  T

  \startluacode
    local f = function()
      context.starttabulate{"|rw(2cm)|rw(2cm)|"}
        context.NC()
        context("A")
        context.NC()
        context("B")
        context.NC()
        context.NR()
      context.stoptabulate()
    end

    f()

    context("U\\par")

    context.startalignment{"middle"}
      context("V") -- OK, "V" is successfully midaligned
    context.stopalignment()

    context.startalignment{"middle"}
      f() -- Wrong, table is not midaligned
    context.stopalignment()

    context.startalignment{"middle"}
      context.dontleavehmode()
      f() -- Wrong, too, table is still not midaligned (?!)
    context.stopalignment()

    -- context.midaligned(f) -- This breaks Ctx
  \stopluacode
\stoptext

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