Re: [NTG-context] no line breaks between figures

[Mojca Miklavec <mojca.miklavec.lists@gmail.com>]

On Wed, Jul 22, 2009 at 03:08, Aditya Mahajan wrote:
> CCed to ConTeXt mailing list.

(And removed the pgf mailing list? :)

> On Tue, 21 Jul 2009, Mojca Miklavec wrote to pgf.user list:
>
>> Hello,
>>
>> I noticed that a large number of
>>   \begin{tikzpicture} \draw (0,0) -- (5,1); \end{tikzpicture}
>> breaks at line end while
>>   \starttikzpicture \draw (0,0) -- (5,1); \stoptikzpicture
>> just generates an infinitely long line.
>>
>> Is there any simple way to fix the behaviour in ConTeXt?
>
> Don't know.

I have just noticed that (independent of the second issue) when
placing several items of:

1.) \tikz \draw (0,0)--(4,2);
    works OK in both LaTeX and ConTeXt
2.) \begin{tikzpicture} \draw (0,0)--(4,2); \end{tikzpicture}
    works OK in LaTeX
3.) \starttikzpicture \draw (0,0)--(4,2); \stoptikzpicture{}
    works OK in ConTeXt
4.) \starttikzpicture \draw (0,0)--(4,2); \stoptikzpicture
    creates an infinitely long line in ConTeXt

Does that ring a bell to anyone? (It must be something trivial like
eating any spaces after \commandsequence, but I don't know what
exactly.)

>> I also don't like the behaviour in
>>   \placefigure{title}{\starttikzpicture ... \stoptikzpicture}
>> that has to be surrounded with
>>   \hbox{\starttikzpicture ... \stoptikzpicture}
>> else the figure gets placed at the beginning of line instead of being
>> centered.
>
> This is what is happening. The pgf code basically boils down to this.
>
> \starttext
> \newbox\pgfpic
>
> \setbox\pgfpic\hbox to 10pt\bgroup abc \egroup
>
> \placefigure
>  {testing box placement}
>  {\leavevmode\raise-2pt\box\pgfpic}
>
> \stoptext
>
> Now since \placefigure internally places its contents in a \vbox, this boils
> down to a differnce beween
>
> \hbox to \textwidth {\hss \vbox{\hbox{abc}} \hss}
>
> \hbox to \textwidth {\hss \vbox{\leavevmode\raise-2pt \hbox{abc}} \hss}
>
> So, the solution is to either patch \placefigure so that
>
> \def\setlocalfloatdimensions#1%
>  {...
>  \global\setbox\floatbox\hbox% was \vbox
>  ....}
>
> or redefine \pgfsys@typesetpicturebox to
>
> \def\pgfsys@typesetpicturebox#1{%
>  ....
>  \hbox{\leavevmode\raise-\pgf@x\box#1}%\hbox added
> }
>
>
> The redefinition at ConTeXt will break some existing documents (i.e., the
> authors will have to manually add a \vbox where there was none earlier). The
> redefinition at tikz end will make all pgf code run slightly slower (an
> extra hbox for each typeset pgfpicture)
>
> If neither of these is acceptable, then we can have a simple wrapper around
> \start-stop tikzpicture:
>
> \def\startTIKZcode{\hbox\bgroup\starttikzpicture}
> \def\stopTIKZcode {\stoptikzpicture\egroup}
>
> which will only affect ConTeXt code.

Would it affect anyone if TikZ would generate an hbox instead of vbox
(at least in ConTeXt)?

That means ... instead of
    \let\starttikzpicture=\tikzpicture
    \let\stoptikzpicture=\endtikzpicture
having
    \def\starttikzpicture{\hbox\bgroup\tikzpicture}
    \def\stoptikzpicture{\endtikzpicture\egroup}

(I admit that I don't understand all the tiny bits, for example when
one would prefer to have vbox, so I might be missing the whole
picture.)

Mojca

------------------------------------------------------------------------------
_______________________________________________
pgf-users mailing list
pgf-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/pgf-users