Function visioncortex::circular_arc

pub fn circular_arc(p_0: PointI32, ap: PointI32, p_3: PointI32) -> Spline

note: the vector p_0 -> p_3 must be at 45 degrees ap: the corner; to decide wich side to take from p_0 -> p_3 the center of the circular arc lies on the opposite side of ap