Re: MPpositiongraphic: I don't know when it's going to work and when it's not.

From: Hans Hagen <pragma@wxs.nl>
To: ntg-context@ntg.nl
Subject: Re: MPpositiongraphic: I don't know when it's going to work and when it's not.
Date: Mon, 27 Jan 2014 13:34:21 +0100	[thread overview]
Message-ID: <52E6524D.1020601@wxs.nl> (raw)
In-Reply-To: <CAGMMSTD=fW627UZ-x705OL3hcGk=gOXjXn7iWsNny-d6pV+6mQ@mail.gmail.com>

On 1/24/2014 12:52 AM, Elspeth McGullicuddy wrote:
> Hi Hans,
>
> The tip you gave me (wandering spaces), worked for the previous
> example, the one where the overlay was attached to the background of
> the "paper".
> For the other example, where the overlay is attached to the background
> of a "\framed", I haven't been able to make it work. The extra spaces
> there, were in fact added "during the mail process" but weren't in my
> file.
>
> I put the file that doesn't work in "attached files", so there are no
> risk it collects extra spaces.
> There is probably an obvious and silly mistake but I can't find it:
> for me it's quite similar to the examples in metafun-p.pdf, p. 127:
> "\framed[background=demo circle]{This text is overlayed.}", but mine
> refuses to work.

you need to anchor the graphic:

\starttext

\defineoverlay[my fourth overlay][\positionoverlay{my backgraphics}]

\startpositionoverlay{my backgraphics}

\setMPpositiongraphic{three}{mypos:circle}{mypos:circleradius=1cm,mypos:circlecolor=red}

\setMPpositiongraphic{three}{mypos:circle}{mypos:circleradius=.5cm,mypos:circlecolor=green}
\stoppositionoverlay

\startMPinclusions
     if unknown context_apos : input mp-apos.mpiv ; fi ;
     if unknown context_abck : input mp-abck.mpiv ; fi ;
\stopMPinclusions

\startMPpositiongraphic{mypos:circle}
     numeric x, y, w, h, d, radius;
     color c;
     path p ;
     x = \MPx{\MPvar{self}};
     y = \MPy{\MPvar{self}};
     w = \MPw{\MPvar{self}};
     radius = \MPvar{mypos:circleradius};
     c = \MPvar{mypos:circlecolor};
     p = (x+w/2+radius,y)..(x+w/2,y+radius)..(x+w/2-radius,y) 
..(x+w/2,y-radius)..cycle;
     drawarrow p withpen pencircle scaled 2pt withcolor c;
     anchor_box(\MPanchor{\MPvar{self}}) ;
\stopMPpositiongraphic

\framed [background=my fourth overlay,align=middle,width=7cm] {have 
attached it: \hpos{three}{{\em here}}, the}

\stoptext

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