Re: wrong positioning of MP graphic in layer

[luigi scarso <luigi.scarso@gmail.com>]

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On Mon, Oct 7, 2013 at 5:56 PM, Pablo Rodríguez <oinos@gmx.es> wrote:

> Dear list,
>
> I have the following sample:
>
>     \definelayer[wrongpositioned][x=0mm, y=0mm, hoffset=0mm,
>      voffset=48mm, state=start]
>     \setuplayer[wrongpositioned]{\startMPcode draw
>      (0mm,0mm)--(8mm,0mm)--(8mm,38mm)--(14mm,38mm) ; \stopMPcode}
>     \setupbackgrounds[page][background={wrongpositioned}]
>     \starttext
>     \input knuth
>     \stoptext
>
> No matter what x, y, hoffset, voffset, location or corner, the MP
> graphic is located where the page margins start.
>
> Sorry for the so basic question, but what is wrong there?
>
> Besides that, I don’t understand how positioning in layers work. I have
> read the wiki, but I don’t get it (geometry isn’t my strength).
>
> x, y, hoffset and voffset are fine. But location and corner are
> mysterious to me. Changing them gave me no clue of what they are.
>
> The four mentioned options set a point in the paper. The corner could be
> the point of the graphic or text that would be set in the previously
> defined point in the paper.
>
> Well, if this isn’t wrong, what can location be?
>
> Sorry, I know it‘s my lack of geometrical knowledge.
>
> Could anyone be so kind to explain me what location and corner mean in
> layers?
>
> Many thanks for your help,
>
>
You can start from here

\setuppapersize[A4][A3]
\setuplayout[location=middle]
\showframe %showlayout
\definelayer[Page]
\setuplayer[Page][width=\paperwidth,height=\paperheight]
\setlayer[Page]{\startMPcode
draw    (0mm,0mm)--(PaperWidth,PaperHeight) withpen pencircle scaled 2pt
withcolor red;
draw    (0mm,PaperHeight)--(PaperWidth,0mm) withpen pencircle scaled 2pt
withcolor blue;
\stopMPcode}
\setupbackgrounds[page][background={Page}]


\starttext
    \input knuth
\stoptext


See also
http://wiki.contextgarden.net/Layers
-- 
luigi

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