Chief Delphi - Cartesian to angle

Quote:

Originally Posted by Ether (Post 1069977)

Here's a simple C function CWYdeg(x,y) which returns an angle from 0 to 360 degrees measured clockwise from the +Y Cartesian axis when given Cartesian coordinates (x,y).

Using single-precision floats, the accuracy is better than +/-0.17 degree over the entire 0 to 360 range.

I've refined the solution. I like these coefficients better:

a = -15.6526435831
b = 60.6626425889
c = -0.0049997982

Although the accuracy is ever so slightly less with these revised coefficients (+/-0.21 instead of +/-0.17 degrees), there is virtually no discontinuity (0.01 degree) at the octant boundaries.