hey there all, ok, not really a ruby question, but did not know where to look. i have a circle on a graph paper. if i know the x and y of a point on the graph, if the center is at 0,0, and i know the radius, how can i find the angle that the point will be on the circumference? somewhere between 1-360. would appreciate any tips, thanks ok, if it is really against the grain to post this question here, anyone have a recommendation of where to put it? thanks all sk

on 2008-12-20 00:00

on 2008-12-20 00:06

shawn bright wrote: > ok, if it is really against the grain to post this question here, > anyone have a recommendation of where to put it? > thanks all > > sk irb(main):007:0> Math.atan2(-1.0, -1.0)*180/Math::PI % 360 => 225.0 irb(main):008:0> Math.atan2(-1.0, 1.0)*180/Math::PI % 360 => 315.0 irb(main):009:0> Math.atan2(1.0, 1.0)*180/Math::PI % 360 => 45.0 irb(main):010:0> Math.atan2(1.0, -1.0)*180/Math::PI % 360 => 135.0 HTH.

on 2008-12-20 08:02

Yes ! that helps a lot, thanks very much, vjoel ! -sk On Fri, Dec 19, 2008 at 4:57 PM, Joel VanderWerf