I meant to include an example of what I mean, since at least it seems to work (am including just the definition part of your example), So at least I can get middle and right alignment.

\define[2]\MemoirChapter
 {\midaligned{\startoverlay
      {#1}
      {#2}
    \stopoverlay}}

Julian

On 17/8/20 4:54 pm, Aditya Mahajan wrote:
On Mon, 17 Aug 2020, jbf wrote:

Am completely new to using Metafun, which I presume I would need to use
to achieve a Hansen Memoir-style Chapter heading (chapter title
overlayed on a large lightgray number). Of course, I am assuming I would
need to use Metafun to create this...

So my first question is to ask if I could achieve the same effect
without Metafun?

I have read through the Metafun manual, and I think I can understand how
to overlay text on a graphic (MP), but it would be currently beyond me
to draw numbers of the kind we find in, say, the Memoir examples.

Has anyone created such an example? I was keenly looking for one in the
manual and elsewhere, in terms of ConTeXt/Metafun commands, but could
not find one. But I'd be quite prepared to 'have a go' at this, if I had
some pointers of just where to start! I assume I would have to
\defineoverlay[number] and then add text on top \framed (but without the
frame borders). Am I at least correct about this?
You don't need metafun for something this simple. Here is a crude 
implementation:

\setuphead[chapter]
           [
             numberstyle={\switchtobodyfont[48pt]},
             numbercolor=gray,
             alternative=command,
             command=\MemoirChapter,
           ]

\define[2]\MemoirChapter%
   {\startoverlay
       {#1}
       {#2}
     \stopoverlay}
\starttext
\startchapter[title={This is a test}]
\stopchapter

\stoptext

Overlays don't allow tuning the location...for that you need layers. See the 
chapter on ornaments in the details manual, which also explains an alternative 
method to set title of chapters (toward the end of that chapter), which is 
useful if you need absolute positioning.

Aditya


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