public static float atan2(float fY, float fX) {
        return (float) Math.atan2(fY, fX);
    }
A direct call to Math.atan2.

@param fY ordinate
@param fX abscissa
@return Math.atan2(fY,fX)
@see java.lang.Math#atan2(double, double)
jme3-core/src/main/java/com/jme3/math/FastMath.java