Re: modify coord-rotate to get exact values for (sin PI) etc (issue 269530043 by address@hidden)

[thomasmorley65]

On 2015/10/30 21:46:55, benko.pal wrote:
> > And PostScript (and PDF and METAFONT) _do_ represent angles in
degrees.
> > So it's sort of silly that we cannot get an angle of 180 degrees
> > straight into PostScript without change.

> now that convinced me.  if we want to output angles in degrees, we
> don't want to switch back and forth neither between degrees and
> radians, nor between angles and sines.  at most one atan (acos) call
> somewhere.

> p

Just back home, noticing the discussion here.

Current patch tries to solve (or better: workaround) the problem in
guile.
I have some other pending patches _needing_ exact values from
coord-rotate.
I'd suggest to push it as is (unless some serious defect would be
detected) after countdown. So that I can go ahead with the follow up
stuff.

Opinions?

Nevertheless, I'd love to work with degrees, rather than radians.
Though, I can't help implementing it as soon as C++ etc is involved.

https://codereview.appspot.com/269530043/