Re: How do you position/move a MPgraphic?

[Peter Rolf <indiego@gmx.net>]

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Daniel Bundzik schrieb:
> Hi!
>
> How do you position/move a MPgraphic?
>
> Let us us say that you have the MPgraphics "somebackground" and 
> "somecolorcircle" (See example below). These MPgraphics are both 
> framed and used as a background,  upon which "sometext" is written on. 
> How can you freely move or position "somecolorcircle"? ( I want to 
> move "somecolorcircle" below "sometext") Naturally, I have read 
> Metafun and tried "shifted (x,y)", \definelayer, \setlayer, register, 
> \setMPlayer, \getMPlayer...
>
> In general, if you have defined two or more MPgraphics how do you 
> position them (In my case "somebackground" is fixed while 
> "somecolorcircle" could be anywhere on "somebackground")?
>
Hi Daniel,

I attached a working example which uses layers. You should take a look 
at the 'details.pdf' manual; link and more information can be found on
http://wiki.contextgarden.net/Layers

Just play around with the layer parameters and see what happens.
'height/width' (for layer definition), 'corner/location' (important to 
understand!) and 'x/y' should be sufficient for most needs. 
'hoffset/voffset' can be handy too, if you want relative positioning.


[pack-lyr.mkii]

\def\dodefinelayer[#1][#2]% \zeropoint ipv \!!zeropoint
  {\setuplayer
     [#1]
     [\c!doublesided=,\c!preset=,
      \c!state=\v!start,\c!direction=\v!normal,\c!option=,
      \c!x=\zeropoint,\c!y=\zeropoint,\c!position=\v!no,
      \c!line=0,\c!column=0,
      \c!width=\nextboxwd,\c!height=\nextboxht,
      \c!offset=\zeropoint,\c!rotation=, % geen 0 !
      \c!hoffset=\zeropoint,\c!voffset=\zeropoint,
      \c!dx=\zeropoint,\c!dy=\zeropoint,
      \c!location=rb,\c!position=\v!no,\c!page=,
      \c!method=\v!overlay,
      \c!sx=1,\c!sy=1,\c!corner=,#2]%
   \doifvalue{\??ll#1\c!doublesided}\v!yes
     {\dopresetlayerbox{\v!left #1}%
      \dopresetlayerbox{\v!right#1}}%
   \dopresetlayerbox{#1}%
   \defineoverlay[#1][\composedlayer{#1}]}


Best wishes,  Peter

> How would you solve this?
>
> Regards,
> Daniel
>


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\setupcolors[state=start]
\setuppapersize[S6][S6]
\setuplayout [width=fit,
rightmargin=0cm,
leftmargin=0cm,
leftmargindistance=0pt,
rightmargindistance=0pt,
height=fit,
topspace=0cm,
header=0pt,
footer=0cm,
bottomspace=0cm,
backspace=0cm,
location=singlesided]

\definecolor[Orange][r=1.,g=.47,b=.0] % dark orange
\setupinteractionscreen[option=max]

\startbuffer[sometext]
\switchtobodyfont[sansserif,1.0cm]
\midaligned{\white \bf This is the text}
\stopbuffer

\starttext

\startuseMPgraphic{somebackground}
   fill fullsquare
       scaled 10cm
       withcolor .625red ;
   fill fullsquare
       scaled 10cm
       shifted (10cm,0)
       withcolor black ;
   fill fullsquare
       scaled 10cm
       shifted (20cm,0)
       withcolor \MPcolor{Orange} ;
   currentpicture := currentpicture xysized(OverlayWidth+.5pt,OverlayHeight+.5pt) ;
\stopuseMPgraphic

\startuseMPgraphic{somecolorcircle}
   colorcircle(2cm,white,.625red,\MPcolor{Orange}) ;
\stopuseMPgraphic

\startTEXpage


\definelayer[somelayer]%[width=600pt,height=450pt]

\setlayer[somelayer]
{\useMPgraphic{somebackground}}

\setlayer[somelayer][x=9.6cm,y=7.5cm]
{\useMPgraphic{somecolorcircle}}

\setlayer[somelayer][y=6cm]
{\getbuffer[sometext]}

\flushlayer[somelayer]

\stopTEXpage

\stoptext

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