Re: gEDA-user: arc angle confusion

["Phil Taylor" <phil@xxxxxxxxxxxxxxxxxxxxxxxx>]

Still, going up in angle is counter clockwise, not clockwise.  That's all I
was trying to say.

Phil


DJ Delorie <dj@xxxxxxxxxxx> wrote:

> 
> > DJ, yeah, right, I remember, but you've got to be on sizzurp (or
> > high on edwin abbott abbott) to think clockwise means
> > 'counterclockwise because if you were in the drawing it would be
> > opposite.  'Clockwise' just doesn't work that way.
> 
> Yeah, it confused me for a while too.  To summarize reality:
> 
> Angle     X/Y    Screen
> 
>   0      x < 0    left
>  90      y > 0    down
> 180      x > 0    right
> 270      y < 0    up
> 
> Given that 0 usually means "right" it's a little strange, and the HIDs
> all add 180 degrees to the angles.
>