Function continuous_line2_sphere2

pub fn continuous_line2_sphere2<S>(
    line: &Line2<S>,
    sphere: &Sphere2<S>,
) -> Option<((S, Point2<S>), (S, Point2<S>))>
where
    S: Real,

Compute the intersection of a 2D line with a 2D sphere (circle).

If the line and circle intersect, the two intersection points are returned with the scalar parameter corresponding to that point along the line.

let sphere = Sphere2::unit();
let line   = Line2::new  ([0.0, 0.0].into(), Unit2::axis_x());
assert_eq!(
  continuous_line2_sphere2 (&line, &sphere).unwrap(),
  ( (-1.0, [-1.0, 0.0].into()),
    ( 1.0, [ 1.0, 0.0].into())
  )
);

Returns None if the line and circle are tangent:

let sphere = Sphere2::unit();
let line   = Line2::new  ([0.0, 1.0].into(), Unit2::axis_x());
assert_eq!(continuous_line2_sphere2 (&line, &sphere), None);