Re: [NTG-context] metafun 2

14 Aug 2019

      On Wed, Aug 14, 2019 at 11:55 AM Hans Hagen  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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Hi,

this looks very promising!!

Since you ask for feature requests:

1) 3d support. This is of course a very big request, but it would also be
useful for many people.
2) About graphing, it would be nice to be able to do contour polots and
density plots. I know I asked for contour plots some time ago, and there
were some examples, but I don't think there was ever some built in support
for it. Maybe that can be done "easy" with help of lua? I guess there exist
good algorithms.
3) (small) The possibility to have arrows in coordinate axes. I have not
had the possibility to test the new features today, and maybe this is
already built in (drawarrow?), but I mention it since I did not see it in
the pdf.

Again, it is very nice that you work on extending MetaPost/MetaFun further!!

/Mikael

Re: [NTG-context] metafun 2

Mikael P. Sundqvist