Hi Hans,
I updated lmtx, but your code does not compile except t= hat the output is a pdf file where it is written ERROR.
Fabrice

tex error =C2=A0 =C2=A0 =C2=A0 > tex= error on line 1 in file ./blond.tex: ?

\font_helpers_low_level_= define ...\scaledfontmode
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 \relax \ifcase \sca= ledfont...
\font_helpers_trigger_define ..._identifier_class
=C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 \csname \v_font_identifier...
\applyfontclassstrate= gies ...to_size \lastnamedcs
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 \else \expandaf= ter \font_h...
\font_helpers_synchronize_font ...classstrategies
=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 \fi \setfalse \c_font_auto...
\rm ->\ifmmode= \mathrm \else \normalrm
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0\fi
\font_basics_switch_style ...dcsname \lastnamed= cs
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 \edef \fontstyle {#1}\ifmm...
...
= l.1 \starttext
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0

=C2=A01= >> =C2=A0\starttext
=C2=A02 =C2=A0 =C2=A0
=C2=A03 =C2=A0 =C2= =A0 \startMPcode
=C2=A04 =C2=A0 =C2=A0 =C2=A0 =C2=A0 defaultfont =C2=A0:= =3D "texgyrepagella-regular*default" ;
=C2=A05 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 defaultscale :=3D 0.8 ;
=C2=A06 =C2=A0 =C2=A0
=C2=A07 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 definecolor [ name =3D "mp:red", =C2= =A0 b =3D 1 ] ;
=C2=A08 =C2=A0 =C2=A0 =C2=A0 =C2=A0 definecolor [ name = =3D "mp:green", y =3D 1 ] ;
=C2=A09 =C2=A0 =C2=A0
10 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 path twos, threes ;
11 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 twos =C2=A0 :=3D fullcircle xscaled 4cm yscaled 2cm rotated 180 shifted= 42

mtx-context =C2=A0 =C2=A0 | fatal error: return code: 256

<= /div>

L= e=C2=A0dim. 1 d=C3=A9c. 2019 =C3=A0=C2=A013:09, Hans Hagen <j.hagen@xs4all.nl> a =C3=A9crit=C2=A0:
<= /div>

On 12/1/2019 11:32 A= M, Fabrice Couvreur wrote:
> Hello
> Thank you for your suggestion. However, it works with context and not =
> with lmtx.
> Fabrice
>
> \starttext
> \startMPcode
>=C2=A0 =C2=A0 =C2=A0defaultfont :=3D "texgyrepagella-regular*defau= lt" ;
>=C2=A0 =C2=A0 =C2=A0defaultscale :=3D0.8;
>
>=C2=A0 =C2=A0 =C2=A0color brown;
>=C2=A0 =C2=A0 =C2=A0brown =3D (0.128,0.00,0.00);
>
>=C2=A0 =C2=A0 =C2=A0path twos, threes, sixes;
>=C2=A0 =C2=A0 =C2=A0twos =3D fullcircle xscaled 4cm yscaled 2cm rotated= 180
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 shifted 42 left;
>=C2=A0 =C2=A0 =C2=A0threes =3D fullcircle xscaled 4cm yscaled 2cm shift= ed 42 right;
>=C2=A0 =C2=A0 =C2=A0sixes =3D buildcycle(twos, threes);
>
>=C2=A0 =C2=A0 =C2=A0fill twos =C2=A0 withcolor brown withtransparency(1= ,0.75);
>=C2=A0 =C2=A0 =C2=A0fill threes withcolor yellow withtransparency(1,0.7= 5);
>=C2=A0 =C2=A0 =C2=A0fill sixes withcolor yellow + brown withtransparenc= y(1,0.75);
>
>=C2=A0 =C2=A0 =C2=A0draw twos;
>=C2=A0 =C2=A0 =C2=A0draw threes;
>
>=C2=A0 =C2=A0 =C2=A0label("...",(1.5cm,0));
>=C2=A0 =C2=A0 =C2=A0label("...",(0,0));
>=C2=A0 =C2=A0 =C2=A0label("...",(-1.5cm,0));
>=C2=A0 =C2=A0 =C2=A0label.top("yeux marron",(-1.5cm,1.25cm));=
>=C2=A0 =C2=A0 =C2=A0label.top("cheveux blonds",(1.5cm,1.25cm)= );
> \stopMPcode
> \stoptext
>
> tex error =C2=A0 =C2=A0 =C2=A0 > tex error on line 1 in file ./blon= d.tex: ?
Looks ok here ... but isn't the transparacy used instead of the sizes? =
Anyway, you can use named colors

\starttext

\startMPcode
=C2=A0 =C2=A0 defaultfont=C2=A0 :=3D "texgyrepagella-regular*default&q= uot; ;
=C2=A0 =C2=A0 defaultscale :=3D 0.8 ;

=C2=A0 =C2=A0 definecolor [ name =3D "mp:red",=C2=A0 =C2=A0b =3D = 1 ] ;
=C2=A0 =C2=A0 definecolor [ name =3D "mp:green", y =3D 1 ] ;

=C2=A0 =C2=A0 path twos, threes ;
=C2=A0 =C2=A0 twos=C2=A0 =C2=A0:=3D fullcircle xscaled 4cm yscaled 2cm rota= ted 180 shifted 42
left ;
=C2=A0 =C2=A0 threes :=3D fullcircle xscaled 4cm yscaled 2cm=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0shifted 42
right ;

=C2=A0 =C2=A0 fill twos=C2=A0 =C2=A0withcolor "mp:red"=C2=A0 =C2= =A0withtransparency(1,0.5) ;
=C2=A0 =C2=A0 fill threes withcolor "mp:green" withtransparency(1= ,0.5) ;

=C2=A0 =C2=A0 draw twos ;
=C2=A0 =C2=A0 draw threes ;

=C2=A0 =C2=A0 label("...",( 1.5cm,0));
=C2=A0 =C2=A0 label("...",( 0,=C2=A0 =C2=A0 0));
=C2=A0 =C2=A0 label("...",(-1.5cm,0));
=C2=A0 =C2=A0 label.top("\strut yeux marron",=C2=A0 =C2=A0(-1.5cm= ,1.25cm));
=C2=A0 =C2=A0 label.top("\strut cheveux blonds",( 1.5cm,1.25cm));=
\stopMPcode

\stoptext

(you cannot overload colors at the tex level in mp but use them in order to be consistent)

Hans

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