My students complain that the dot in, for example, $\dot M$ is too small
and that they easily miss it. So I have been trying to make a bigger
one, but haven't found a solution that plays nicely with the surrounding
math.
For example,
\def\mydot{\overset{\externalfigure[dot.pdf]}} %bigger than usual one
\def\Vdot{\mydot V}
\starttext
$\rho\Vdot\omega$ % loose spacing
$\rho V\omega$ % tighter spacing
\stoptext
where dot.pdf is a circle of radius 0.8bp (attached).
But the \Vdot gets wrapped in an hbox (inside \overset), so the
surrounding space is too large.
I also tried a metafun approach
\startuniqueMPgraphic{math:mydot}
fill unitcircle scaled 2 shifted
(OverlayWidth/2-1,OverlayHeight+OverlayOffset);
path q;
q:= unitsquare xscaled OverlayWidth yscaled (OverlayHeight+OverlayOffset+1);
setbounds currentpicture to q;
\stopuniqueMPgraphic
\definemathornament [mathmydot] [mp=math:mydot]
\starttext
$\rho\mathmydot{V}\omega$
$\rho V\omega$
$\rho\mathmydot{V}_0^2\omega$
$\rho\dot{V}_0^2\omega$
\stoptext
The $\rho\mathmydot{V}\omega$ looks good. But the subscripted _0 is not
tucked under the V, because the bounds of the character are now a
rectangle that doesn't know about its shape. I think for a similar
reason the superscripted 2 is quite high.
Is there more math-friendly (and elegant) way to get a fatter dot?
-Sanjoy
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