On Wed, Jul 30, 2014 at 01:40:55PM +0100, Ted Harding wrote:
> :
> The main difference, which I strongly recommend, is to use
> 'm' rather than 'v' as the scale for the vertical motion.
> The reason is that 1v is one line-space, which can be set
> independently of the current point-size, while 'm' is, in
> effect, the point size, so that the result will scale as
> the point-size changes.
>
> What I had devised (and again some tweaking of the motions
> may be desirable -- it might look better to shift it down
> a bit) is:
>
> .char \[-+] \Z'\fS+\fP'\v'-0.370m'\fS\[mi]\f[]\v'0.370m'
>
> Then, in plain text,
>
> \[-+] \[+-]
>
> will display appropriately. And of course one can also define
> "-+" for the 'eqn' environment (where it will feel most at home
> anyway):
>
> .EQ
> define -+ "\[-+]"
> cos ( A +- B ) ~~=~~
> cos ( A ) cos ( B ) ~ -+ ~ sin ( A ) sin ( B )
> .EN
>
> and, to show how the scaling adapts:
>
> .EQ
> a ~+-~ b ~-+~ c ~~~~~ e sup{a~ +-~ b ~-+~ c}
> .EN
>
> This little thing has provoked quite some interest!
This is what I like about this group!
There is such depth of knowledge that we all can draw on.
Is it possible to make .char \[-+] ... something that is part of the
S font by default?
Otherwise we are likely to revisit this in a year or two.
--
Mike Bianchi
