--- In PPLetterpress@y..., Brian Molanphy <bmolanphy@c...> wrote:
> what is the purpose of the control points?
So you mean the ones at the very end that turn
the straight segements into curvy ones, right?
Well, you could see them as only having an aesthetic role.
A [digital] text face can in fact be used for display work,
and it's good to account for that by reducing the jarring
effect of a trap.
I guess you could leave the segments flat (which would
in fact increase the trap's "ink capacity"), and usually
it won't matter (it might even look more appropriate in
some designs, such as Petr van Blokland's Proforma), but
continuity of curves is generally a good thing, at least
in mainstream bezier philosophy.
Also note that from a purist perspective the trap has to
curve in as an arc because ink gain is radial, and the
opposite of that is what might be called a "cleavage",
for lack of a more docile term.