Re: metafun 2

[Alan Braslau <braslau.list@comcast.net>]

We have eofill in MP (in pdf/ps in fact) and that likely will do what you need.

Alan


On Sat, 17 Aug 2019 00:31:38 +0100
Adam Reviczky <reviczky@gmail.com> wrote:

> Hi Hans,
> 
> One MetaPost feature 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.
> 
> For logos I use the workaround with creating a path alongside the excluded
> areas but it is always cumbersome.
> 
> I have briefly mentioned it back here:
> https://mailman.ntg.nl/pipermail/ntg-context/2011/056910.html
> 
> Just for illustration purposes, if I wanted to fill the area in between two
> circles:
> 
> *path p ;
> **p := fullcircle scaled 1cm ;
> **path q ;
> **q := fullcircle scaled .5cm ;
> *
> 
> Instead of creating a new path along both circles with:
> 
> 
> *r := p -- reverse q -- cycle ;*
> 
> It would be nice to have something like:
> 
> *fill p excluding q ;*
> 
> or something like that.
> 
> I mainly have use-cases for differences in shapes, but filling the
> intersection of two shapes would be the same idea.
> 
> Thanks,
> Adam
> 
> 
> On Wed, Aug 14, 2019 at 10:57 AM Hans Hagen <j.hagen@xs4all.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/magazines/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
> > ConTeXt LMTX here. For instance,
> >
> >      draw lmt_outline [
> >          content       = "hello",
> >          kind          = "reverse",
> >          fillcolor     = "darkred",
> >          drawcolor     = "darkblue",
> >          rulethickness = 1/2,
> >      ] 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:
> >
> >      draw lmt_followtext [
> >          content = "How well does it work {\bf 1}! ",
> >          path    = (fullcircle scaled 4cm),
> >          trace   = true,
> >          spread  = true,
> >      ] ysized 5cm ;
> >
> > which is an easier interface to text along a curve. Arrows can be drawn
> > with
> >
> >      draw lmt_arrow [
> >          kind        = "draw",
> >          location    = "middle",
> >          alternative = "curved",
> >          path        = fullcircle
> >              scaled  3cm
> >              shifted (3.5cm,0cm),
> >      ] 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.
> >
> > So the question is: What do you miss in metapost support? Of course it
> > should fit within the concept, so 'artistic freehand drawings' is not
> > something that is likely to get interfaced. We are particularly
> > interested in educational applications, if only because ConTeXt started
> > out that way.
> >
> > Hans
> >
> >
> >
> > -----------------------------------------------------------------
> >                                            Hans Hagen | PRAGMA ADE
> >                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> >         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> > -----------------------------------------------------------------
> >
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