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1,605 bytes added ,  22:12, 14 January 2006
first example for layers
There's still no manual about them.
 
=My first Layer=
 
Define a layer that takes the whole page, but starts with an offset
<texcode>
\definelayer [mybg] % name of the layer
[x=-3mm, y=-3mm, % bleed over the page
width=\paperwidth, height=\paperheight]
</texcode>
 
Now you can put something on that layer:
<texcode>
\setlayer [mybg] % name of the layer
[x=2cm, y=5cm] % placement (from upper left corner of the layer)
{\framed[frame=on, width=3cm, height=2cm]{LAYER}}
</texcode>
 
Activate the layer as a background:
<texcode>
\setupbackgrounds [page] [background=mybg]
% switch it off again:
\setupbackgrounds [page] [background=]
</texcode>
 
You could also typeset the layer once using <cmd>placelayer</cmd> or <cmd>flushlayer</cmd>, but then the location depends from the upper left of the text area! (Bug?)
 
==Placement==
 
There are several possibilities for defining the placement of layer content:
* x, y (or hoffset, voffset) : offset from upper left corner
* corner : reference point, something like <code>{left, top}</code>
* location : alignment of the element relative to the corner, something like <code>{right, bottom}</code>
* preset : a named location, see below
 
There are some "presets" for paper egde placement:
<texcode>
% These four are defined by ConTeXt!
\definelayerpreset [lefttop] [corner={left,top}, location={right,bottom}]
\definelayerpreset [righttop] [corner={right,top}, location={left,bottom}]
\definelayerpreset [leftbottom] [corner={left,bottom}, location={right,top}]
\definelayerpreset [rightbottom] [corner={right,bottom}, location={left,top}]
</texcode>
Similarly you can define your own presets.
=Links=

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