atan2()

static FASTLED_FORCE_INLINE s16x16 fl::s16x16::atan2 ( s16x16 y, s16x16 x )

inlinestatic

Definition at line 195 of file s16x16.h.

                                                                             {
        constexpr s16x16 pi(3.1415926f);
        constexpr s16x16 pi_over_2(1.5707963f);
        if (x.mValue == 0 && y.mValue == 0) return s16x16();
        if (x.mValue == 0) return y.mValue > 0 ? pi_over_2 : -pi_over_2;
        if (y.mValue == 0) return x.mValue > 0 ? s16x16() : pi;
        s16x16 ax = abs(x);
        s16x16 ay = abs(y);
        s16x16 a;
        if (ax >= ay) {
            a = atan_unit(ay / ax);
        } else {
            a = pi_over_2 - atan_unit(ax / ay);
        }
        if (x.mValue < 0) a = pi - a;
        if (y.mValue < 0) a = -a;
        return a;
    }

References s16x16(), abs(), atan_unit(), FASTLED_FORCE_INLINE, FL_NOEXCEPT, fl::x, and fl::y.

Referenced by acos(), and asin().

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