Some question regarding Layers

Some question regarding Layers

[Erik Margraf]

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Hi all,
i have two questions regarding the use of layers.

 -- Is there an easy way to position a layer in the middle of the page.
    My intent is to position some kind of graphic/picture there.
    I usually try to wrap the picture in a "hbox to \paperwidth {\hfil
\externalfigure{} \hfil} and then
    wrapping the hbox in a vbox
         -- Is there a better way to achieve this?
         -- How to do that with layers?

-- Is it possible to define and position layers in one Macro. I have
something like the following
   in mind (untested):

   \define[1]\MLayer{
      \definelayer[#1]
      \setlayer[#1][state=start]{\externalfigure[#1]}
    }
    My experience so far is, that it's necessary for a layer to appear that
it is listed in "pagebackgrounds"
    ist this true? With this it seems, that a macro like that above is
impossible, true?

thanks in advance for your help

Erik

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Re: Some question regarding Layers

[Wolfgang Schuster]

Am 17.12.2009 um 14:05 schrieb Erik Margraf:

> Hi all,
> i have two questions regarding the use of layers. 
> 
>  -- Is there an easy way to position a layer in the middle of the page.
>     My intent is to position some kind of graphic/picture there. 
>     I usually try to wrap the picture in a "hbox to \paperwidth {\hfil \externalfigure{} \hfil} and then
>     wrapping the hbox in a vbox
>          -- Is there a better way to achieve this?
>          -- How to do that with layers? 
> 
> -- Is it possible to define and position layers in one Macro. I have something like the following
>    in mind (untested): 
> 
>    \define[1]\MLayer{
>       \definelayer[#1]
>       \setlayer[#1][state=start]{\externalfigure[#1]}
>     }
>     My experience so far is, that it's necessary for a layer to appear that it is listed in "pagebackgrounds"
>     ist this true? With this it seems, that a macro like that above is impossible, true?

\define[1]\MLayer
  {\definelayer[#1]%
   \expandparameters\setupbackgrounds[page][background={\currentvalue,#1}]%
   \setlayerframed[#1][width=\paperwidth,height=\paperheight,frame=off,align={middle,middle}]{\externalfigure[#1]}}

Wolfgang

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___________________________________________________________________________________

Contextual spacing

[Andreas Harder]

Hi all,

please have a look at the attached example. Is there a (not manually) possibility to reduce the space of two consecutive headers? Another situation is if a header with ‘before=,’ is followed by an environment with 'before=\blank’ …

\setupdelimitedtext[blockquote][before=\blank,after=\blank] 
\setuphead[subject][after=,style=\bfa]

\starttext
\subject{No space after the header}

\input tufte

\subject{Space from the \tex{blockquote}-environment} % \vskip-\lineheight

\startblockquote
  \input tufte
\stopblockquote

\input tufte

\startblockquote
  \input tufte
\stopblockquote

\startcolumns
  \section{Section}
  \input tufte \par
  \subsection{Subsection}
  \input tufte \par \column
  \section{Section} % \vskip-1.25\lineheight
  \subsection{Subsection}
  \input tufte \par
  \input tufte \par
\stopcolumns

\stoptext


Thanks in advance

	Andreas
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___________________________________________________________________________________

Re: Contextual spacing

[Wolfgang Schuster]

Am 17.12.2009 um 17:48 schrieb Andreas Harder:

> Hi all,
> 
> please have a look at the attached example. Is there a (not manually) possibility to reduce the space of two consecutive headers? Another situation is if a header with ‘before=,’ is followed by an environment with 'before=\blank’ …
> 
> \setupdelimitedtext[blockquote][before=\blank,after=\blank]

\setupdelimitedtext[...][spacebefore=default,spaceafter=default]

you can now use before/after for different settings

> \setuphead[subject][after=,style=\bfa]
> 
> \starttext
> \subject{No space after the header}
> 
> \input tufte

interesting because it works in MkII when i add \setupinterlinespace[...] to the preamble

> \subject{Space from the \tex{blockquote}-environment} % \vskip-\lineheight
> 
> \startblockquote
>  \input tufte
> \stopblockquote
> 
> \input tufte
> 
> \startblockquote
>  \input tufte
> \stopblockquote
> 
> \startcolumns
>  \section{Section}
>  \input tufte \par
>  \subsection{Subsection}
>  \input tufte \par \column
>  \section{Section} % \vskip-1.25\lineheight
>  \subsection{Subsection}
>  \input tufte \par
>  \input tufte \par
> \stopcolumns
> 
> \stoptext

see http://www.ntg.nl/pipermail/ntg-context/2008/034443.html

Wolfgang

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___________________________________________________________________________________

Re: Contextual spacing

[Andreas Harder]

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Am 17.12.2009 um 18:19 schrieb Wolfgang Schuster:

> 
> Am 17.12.2009 um 17:48 schrieb Andreas Harder:
> 
>> Hi all,
>> 
>> please have a look at the attached example. Is there a (not manually) possibility to reduce the space of two consecutive headers? Another situation is if a header with ‘before=,’ is followed by an environment with 'before=\blank’ …
>> 
>> \setupdelimitedtext[blockquote][before=\blank,after=\blank]
> 
> \setupdelimitedtext[...][spacebefore=default,spaceafter=default]
> 
> you can now use before/after for different settings
> 
>> \setuphead[subject][after=,style=\bfa]
>> 
>> \starttext
>> \subject{No space after the header}
>> 
>> \input tufte
> 
> interesting because it works in MkII when i add \setupinterlinespace[...] to the preamble
> 
>> \subject{Space from the \tex{blockquote}-environment} % \vskip-\lineheight
>> 
>> \startblockquote
>> \input tufte
>> \stopblockquote
>> 
>> \input tufte
>> 
>> \startblockquote
>> \input tufte
>> \stopblockquote
>> 
>> \startcolumns
>> \section{Section}
>> \input tufte \par
>> \subsection{Subsection}
>> \input tufte \par \column
>> \section{Section} % \vskip-1.25\lineheight
>> \subsection{Subsection}
>> \input tufte \par
>> \input tufte \par
>> \stopcolumns
>> 
>> \stoptext
> 
> see http://www.ntg.nl/pipermail/ntg-context/2008/034443.html

Hello Wolfgang,

thanks for the hint, but I don’t get it. How can I bind a signal to a heading? If I understand right a signal is a tag that can be attached to a macro …? So I’ve tried the following:

\newsignal\SpaceAfterSection

\def\TestSpace
  {\ifdim\lastskip=\SpaceAfterSection \blank[nowhite]
   \else \blank[2*big]\fi}

\setuphead[section]    [after=\SpaceAfterSection]
\setuphead[subsection] [before=\TestSpace]

\starttext  % \showgrid
\startcolumns
  \section{Section}
  \input tufte \par
  \subsection{Subsection}
  \input tufte \par \column
  \section{Section} 
  \subsection{Subsection}
  \input tufte \par
  \input tufte \par
\stopcolumns
\stoptext

I appreciate your help!  

	Andreas

PS. I use only MkIV

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Re: Contextual spacing

[Wolfgang Schuster]

Am 18.12.2009 um 00:05 schrieb Andreas Harder:

> thanks for the hint, but I don’t get it. How can I bind a signal to a heading? If I understand right a signal is a tag that can be attached to a macro …? So I’ve tried the following:

A signal is a (very small) vertical or horizontal skip, to use it you need \vskip or \hskip.

\setuphead[section][after=\vskip\SpaceAfterSection]

Wolfgang
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Re: Contextual spacing

[Andreas Harder]

Am 18.12.2009 um 06:31 schrieb Wolfgang Schuster:

> 
> Am 18.12.2009 um 00:05 schrieb Andreas Harder:
> 
>> thanks for the hint, but I don’t get it. How can I bind a signal to a heading? If I understand right a signal is a tag that can be attached to a macro …? So I’ve tried the following:
> 
> A signal is a (very small) vertical or horizontal skip, to use it you need \vskip or \hskip.
> 
> \setuphead[section][after=\vskip\SpaceAfterSection]

Ah, I see, that did the trick. Thanks you very much!

Andreas
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Re: Some question regarding Layers

[Wolfgang Schuster]

Am 18.12.2009 um 21:56 schrieb Erik Margraf:

> Thank's very much! Works perfect. At least with texexec (I suppose that's MKII) 
> I didn't get it to work with "context" (MKIV, i suppose) 
> Is this supposed to work unchanged with MIV also?

AFAIR \currentvalue did not work in MkIV but you don't have to define a new layer
for each graphic, one is enough and can be multiple times.

\definelayer[MLayer]

\setupbackgrounds[page][background=MLayer]

\define[1]\MLayer
  {\setlayerframed
     [MLayer]
     [width=\paperwidth,
      height=\paperheight,
      frame=off,
      align={middle,middle}]
     {\externalfigure[#1]}}

\starttext
...
\stoptext

Wolfgang
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