Layers
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Layers are ConTeXt's mechanism for absolute positioning of elements and other advanced techniques like switching elements on and off.
There's still no manual about them.
My first Layer
Define a layer that takes the whole page, but starts with an offset
\definelayer [mybg] % name of the layer [x=-3mm, y=-3mm, % bleed over the page width=\paperwidth, height=\paperheight]
Now you can put something on that layer:
\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}}
Activate the layer as a background:
\setupbackgrounds [page] [background=mybg] % switch it off again: \setupbackgrounds [page] [background=]
You could also typeset the layer once using \placelayer or \flushlayer, 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
{left, top}
- location : alignment of the element relative to the corner, something like
{right, bottom}
- preset : a named location, see below
There are some "presets" for paper egde placement:
% 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}]
Similarly you can define your own presets.
Links
- Some applications in the Details manual
- Sample documents: BusinessCard and Letter style
- Source: page-lyr
TODO: We need a lot of documentation and samples for this complicated subject. (See: To-Do List) |