Re: [NTG-context] Layers, overlays
Hello Lukáš,
I don't understand layers and overlays. This is what I could learn
about \tightlayer from the source; I hope that reviving your question
will help somebody else actually answer it.
\tightlayer is defined in pack-lyr.mkiv.
\unexpanded\def\tightlayer[#1]%
{\hbox
{\def\currentlayer{#1}% todo: left/right
\setbox\nextbox\emptybox % hoogte/breedte are
\wd\nextbox/\ht\nextbox
\hsize\layerparameter\c!width % \overlaywidth = \hsize
\vsize\layerparameter\c!height % \overlaywheight = \vsize
\composedlayer{#1}}}
The last command flushes the layer we are about to place:
\composedlayer{x} is syntactic sugar for \flushlayer[x]. (Braces vs.
brackets.)
So it seems that what \tightlayer does is create a layer object
exactly as large as its contents? What this is good for, and how it
relates to overlays, I do not know.
Good luck!
--Sietse
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[NTG-context] Layers, overlays
Hello,
I'd like to ask two questions which appeared on topic Layer vs. overlay.
Q1: What does \tightlayer[...] exactly do? (No item on wiki.)
Q2: Why some layer properties are specified on \definelayer (beforetext:
width=\overlaywidth,height=\overlayheight) and some during overlay setups
(beforetext: preset=righttop)? - Related code given before:
\starttext
\definelayer [beforetext][width=\overlaywidth,height=\overlayheight]
\defineoverlay[beforetext][{\setups[beforetext]\tightlayer[beforetext]}]
\startsetups[beforetext]
\setlayer[beforetext][preset=righttop]
{\framed[width=2in]{foo}}
\stopsetups
bar
\stoptext
TIA.
Best regards,
Lukas
--
Ing. Lukáš Procházka [mailto:l...@pontex.cz]
Pontex s. r. o. [mailto:pon...@pontex.cz] [http://www.pontex.cz]
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147 14 Praha 4
Tel: +420 244 062 238
Fax: +420 244 461 038
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