Re: Some question regarding Layers

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

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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