Re: no line breaks between figures

Re: no line breaks between figures

[Aditya Mahajan]

CCed to ConTeXt 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 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.

Aditya
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Re: no line breaks between figures

[Hans Hagen]

Aditya Mahajan wrote:

> Now since \placefigure internally places its contents in a \vbox, this 
> boils down to a differnce beween

that will not change .. (being in vmode also has advantages with regards 
to spurious spaces)

> 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)

not that much slower i guess as not much repackaging is needed, just a 
box flush; in tikz parsing and calculations of the graphic take much 
more time (just take look at traced output); if you want to optimize 
tikz there are other tricks

> 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.

or just add a \dontleavehmode in front of the picture

Hans

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

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

[Mojca Miklavec]

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

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

[Aditya Mahajan]

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On Wed, 22 Jul 2009, Mojca Miklavec wrote:

> On Wed, Jul 22, 2009 at 03:08, Aditya Mahajan wrote:
>> CCed to ConTeXt mailing list.
>
> (And removed the pgf mailing list? :)

No... it was in the newsroup header (I was replying via gmane interface).

>> 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.)

Try the undocumented equivalent of \begin{...} \end{...} in ConTeXt:

\start[tikzpicture] ... \stop[tikzpicture]

>>> 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.
>>
>> [explanation snipped]
>>
>> 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}


This is same as the workaround that I suggested. It should work perfectly 
fine in ConTeXt.

Aditya

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