On 2013–03–04 Roland Thiers wrote: > I'm learning a little bit of metapost language, using metafun manual. > I made some background for a title (surely the code is awful, thanks > for suggestions of improvement) but it's static, i'd like to adapt it to > the widthof the text. I don't know if it is possible from my code > and if it is i don't know how to do !
You can use the variable OverlayWidth to obtain the width of the
overlay, which is determined by the provided text. You can use it as
follows:
\setuplayout
[backspace=6cm]
\startuniqueMPgraphic{essai}
path p,p',q,q';
w:=2OverlayWidth;
p := (0,0.1cm) -- (w,0.3cm);
q := (11cm,-0.7cm) -- (w,2.2cm);
p':= (w,1.3cm) -- (-0.4cm,1.4cm);
q':= (0.3cm,2.4cm) -- (0.2cm,-0.3cm);
pickup pencircle scaled 1mm;
drawoptions(withcolor 0.3white);
draw p; draw p';
draw q; draw q';
pair A; A:=q'intersectionpoint p';
pair B; B:=q intersectionpoint p';
pair C; C:=p intersectionpoint q;
pair D; D:=q'intersectionpoint p;
path s; s:= A--B--C--D--cycle;
fill s withcolor .8white;
\stopuniqueMPgraphic
\defineoverlay
[encadrement]
[\uniqueMPgraphic{essai}]
\defineframed
[boxframed]
[frame=off,
foregroundstyle=bolditalic,
foregroundcolor=darkred,
background=encadrement]
\starttext
\boxframed{Devoir de mathématiques}
\blank [2cm]
\boxframed{Devoir de mathématiques and some more text}
\stoptext
Marco
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