Hi Hans, Thank you very much for the new features! I haven't yet read all the mag-1104-mkiv.pdf where you explain some of them, but after modifying one of your examples, I noticed that some funtions get a strange graph, which is probably due to the fact that metafun2 is interpolating between points in a way which is not correct. For instance, in the following example (which is a slight modification of yours), the curve drawn is not a graph, in the sense that for some values of x it seems to be two or more values of y. How does metafun 2 traces the curve between two discretization points? Best regards: OK %%% begin draw-2.tex \starttext \startMPcode{doublefun} draw lmt_function [ xmin = 1.0, xmax = 2.5066283, xstep = .1, ymin = -2, ymax = 2, % xticks = "bottom", xsmall = 80, xlarge = 20, % yticks = "left", ysmall = 40, ylarge = 4, code = "1.5 * math.sin(2*x^2)", xlabels = "yes", ylabels = "yes", ycaption = "\strut\tfd \rotate[rotation=90]{vertical}", xcaption = "\strut\tfd horizontal", pointsymbol = "dot", pointsize = 4, pointcolor = "orange", sx = 2mm, sy = 4mm, linewidth = .025mm, offset = .1mm, ] xsized 8cm ; \stopMPcode \stoptext %%% end draw-2.tex

On 14 Aug 2019, at 11:54, 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 ----------------------------------------------------------------- ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________

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 -----------------------------------------------------------------

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net

___________________________________________________________________________________

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

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 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 -----------------------------------------------------------------

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net

___________________________________________________________________________________