Hi Hans,

One MetaPost featur= e that I was looking forward to is the ability to create a fill between two= shapes.

Something like a difference function of two path's.<= /div>

For logos I use the workaround with creating a pat= h alongside the excluded areas but it is always cumbersome.

<= /div>

I have briefly mentioned it back here: https://m= ailman.ntg.nl/pipermail/ntg-context/2011/056910.html

Just for illustration purposes, if I wanted to fill the area in betw= een two circles:

path p ;
p :=3D fullcircle scaled 1cm ;
path q ;
q :=3D fullcircle scaled .5cm ;

Instead of creating a new path along both circles with= :

r :=3D p -- reverse q -- cycle ;

It would be nice to have something like:

fill p excludi=
ng q ;

or something like that.

I mainly h= ave use-cases for differences in shapes, but filling the intersection of tw= o shapes would be the same idea.

Thanks,

Adam

On Wed, Aug 14, 2019 at 10:57 AM Hans= Hagen <j.hagen@x= s4all.nl> wrote:

Hi,

In the process of providing an additional (more abstract) interface to
some of the old and also new MetaFun code we wonder what kind of
features users would like to see.

http://www.pragma-ade.com/general/magaz= ines/mag-1104-mkiv.pdf

As a teaser I uploaded a MyWay document that shows some of what is
coming. All is experimental but it shows the direction. We're talking <= br> ConTeXt LMTX here. For instance,

=C2=A0 =C2=A0 =C2=A0draw lmt_outline [
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0content=C2=A0 =C2=A0 =C2=A0 =C2=A0=3D &qu= ot;hello",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0kind=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =3D "reverse",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0fillcolor=C2=A0 =C2=A0 =C2=A0=3D "da= rkred",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0drawcolor=C2=A0 =C2=A0 =C2=A0=3D "da= rkblue",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0rulethickness =3D 1/2,
=C2=A0 =C2=A0 =C2=A0] ysized h shifted (3.75h,-1.25h) ;

Wraps all the outline drawing in one macro with a set of options (there will be xml interface definitions for that). Or take:

=C2=A0 =C2=A0 =C2=A0draw lmt_followtext [
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0content =3D "How well does it work {= \bf 1}! ",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0path=C2=A0 =C2=A0 =3D (fullcircle scaled = 4cm),
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0trace=C2=A0 =C2=A0=3D true,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0spread=C2=A0 =3D true,
=C2=A0 =C2=A0 =C2=A0] ysized 5cm ;

which is an easier interface to text along a curve. Arrows can be drawn with

=C2=A0 =C2=A0 =C2=A0draw lmt_arrow [
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0kind=C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D "= ;draw",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0location=C2=A0 =C2=A0 =3D "middle&qu= ot;,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0alternative =3D "curved",
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0path=C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D fullc= ircle
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0scaled=C2=A0 3cm
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0shifted (3.5cm,0cm),
=C2=A0 =C2=A0 =C2=A0] withcolor "darkblue" ;

but of course the low level interface with its many variables for
tweaking stays around. Other examples are shown in the mentioned document.<= br>
So the question is: What do you miss in metapost support? Of course it
should fit within the concept, so 'artistic freehand drawings' is n= ot
something that is likely to get interfaced. We are particularly
interested in educational applications, if only because ConTeXt started out that way.

Hans

-----------------------------------------------------------------
=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=A0Hans Hagen | PRAGMA ADE
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ridderstraat 27 | 80= 61 GH Hasselt | The Netherlands
=C2=A0 =C2=A0 =C2=A0 =C2=A0 tel: 038 477 53 69 | www.pragma-ade.nl | www.= pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________= ________
If your question is of interest to others as well, please add an entry to t= he Wiki!

maillist : ntg-cont= ext@ntg.nl / http://www.ntg.nl/mailman/listinfo/nt= g-context
webpage=C2=A0 : http://www.pragma-ade.nl / http://context.aanhet.net=
archive=C2=A0 : https://bitbucket.org/phg/context-m= irror/commits/
wiki=C2=A0 =C2=A0 =C2=A0: http://contextgarden.net
___________________________________________________________________________= ________

--000000000000fedb6a0590446608-- --===============8307212451253490704== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KSWYgeW91ciBxdWVzdGlvbiBpcyBvZiBpbnRlcmVz dCB0byBvdGhlcnMgYXMgd2VsbCwgcGxlYXNlIGFkZCBhbiBlbnRyeSB0byB0aGUgV2lraSEKCm1h aWxsaXN0IDogbnRnLWNvbnRleHRAbnRnLm5sIC8gaHR0cDovL3d3dy5udGcubmwvbWFpbG1hbi9s aXN0aW5mby9udGctY29udGV4dAp3ZWJwYWdlICA6IGh0dHA6Ly93d3cucHJhZ21hLWFkZS5ubCAv IGh0dHA6Ly9jb250ZXh0LmFhbmhldC5uZXQKYXJjaGl2ZSAgOiBodHRwczovL2JpdGJ1Y2tldC5v cmcvcGhnL2NvbnRleHQtbWlycm9yL2NvbW1pdHMvCndpa2kgICAgIDogaHR0cDovL2NvbnRleHRn YXJkZW4ubmV0Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCg== --===============8307212451253490704==--