c++ - Position percentage to degree -



c++ - Position percentage to degree -

double x = ...; // -1.0 1.0 double y = ...; // -1.0 1.0 int deg = (int) ((atan(x / y) * 57.2958) + (y > 0 ? 540 : 360)) % 360;

some basic geometry can't seem figure out right now. spent while on it. above code works ok-ish seems mirrored wrong , i'm pretty sure mod isn't required here.

i have aa rather odd scenario, need grade outputs when reddish dot @ position. mirrored unit circle.

looking easy implementation (and maybe geometry refresher).

you need:

degrees = atan2(x, y) * 360.0 / (2.0 * m_pi) + 180.0;

note utilize of atan2 valid 4 quadrant result. need add together π radians (180 degrees) since atan2 returns values in range -π π.

note x , y transposed compared more conventional usage (atan2(y, x)).

live demo

c++ math geometry

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