[cairo] Shouldn't Cairo use/offer degrees rather than radians?

[David Kastrup]

Bill Spitzak <spitzak at gmail.com> writes:

> On Fri, Jun 30, 2017 at 1:44 PM, David Kastrup <dak at gnu.org> wrote:
>
>> I am not calling any atan2d.
>
> Your code copied and pasted from the previous email. If this is not
> your code please explain where the code you want to use is:

Appended again.  Sorry for the atan2d thing: I should have checked for
completeness, and quoting vector->angle code with respect to Cairo was
rather pointless in the first place.

The missing code unsurprisingly was

static inline Real
atan2d (Real y, Real x)
{
  return atan2 (y, x) * (180.0 / M_PI);
}

but with regard to Cairo, the direction vector->angle is hardly
relevant, with angle->vector being the seminal API in question.

I'll append the proposed patch again (at the bottom)

David Kastrup
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