finding angles 0-360

Question

Need help with a math issue: i need to get the true angle from 0 degrees using x and y cordinates im using this at the moment:

Math.atan((x2-x1)/(y1-y2))/(Ma         


        

Answer 1

so with a single decesion (i hope this ugly basiclike notation explains it):

IF x = 0 THEN

360degree = 270 - (SIGN(x) + 1) * 90

ELSE

360degree = MOD(180 + (SIGN(y) + 1) * 90 + ATAN(x/y) , 360)

ENDIF

to draw a full circle from north 0degree to 360degree clockwise:

x=SIN(0to360) y=COS(0to360)

cheers, Lev