scaling reusableMPgraphic & some ConTeXt programming

["Mojca Miklavec" <mojca.miklavec.lists@gmail.com>]

Hello,

the answers to these three questions are most probably one-liners, but
I don't know which ones ;)

1. How can I scale (an already defined) reusableMPgraphic? Simplified
example of what I currently (want to) have:

% how should I change this definition?
\def\usemygraphic[#1][#2]{\reuseMPgraphic{#1}}
\usemygraphic[name][width=.7\textwidth]


2. I have several graphics defined as

\startGNUPLOTgraphic[1][name]
	draw fullcircle scaled 3cm withcolor .625red;
\stopGNUPLOTgraphic
\startGNUPLOTgraphic[2][name]
	draw fullcircle scaled 3cm withcolor .625green;
\stopGNUPLOTgraphic
\startGNUPLOTgraphic[3][name]
	draw fullcircle scaled 3cm withcolor .625blue;
\stopGNUPLOTgraphic

\startGNUPLOTgraphic[1][othername]
	fill fullcircle scaled 3cm withcolor .625red;
\stopGNUPLOTgraphic
\startGNUPLOTgraphic[2][othername]
	fill fullcircle scaled 3cm withcolor .625green;
\stopGNUPLOTgraphic

and a pretty stupid definition:

\long\def\startGNUPLOTgraphic
	{\dodoubleargument\dostartGNUPLOTgraphic}

\long\def\dostartGNUPLOTgraphic[#1][#2]#3\stopGNUPLOTgraphic % [number][name]
	{% add to counter to note the nuber of the graphic
         % define a new counter for the first time when you use it
	 \doif{#1}{1}{\doglobal\newcounter\abc}% counter name has to depend on #2
	 \doglobal\increment\abc % assigning the value #1 to it would also be OK
	 \startreusableMPgraphic{gpg:#2:#1}#3\stopreusableMPgraphic}

How can I give a better name than \abc to the counter (the name should
depend on #2 in order to be unique)?


3. I would like to change \usemygraphic, so that
\usemygraphic[othername] or \usemygraphic[othername][height=5cm] would
resolve to
    \dorecurse{2}{\useMPgraphic{gpg:othername:\recurselevel}}
and \usemygraphic[name][n={1,3},width=8cm] (syntax might be different
if necessary) to
    \reuseMPgraphic{gpg:name:1}
    \reuseMPgraphic{gpg:name:3}
(with proper scaling if possible).

How should I start?

Thank you a lot for any hints,
    Mojca Miklavec