Function kurbo::common::solve_cubic

pub fn solve_cubic(c0: f64, c1: f64, c2: f64, c3: f64) -> ArrayVec<[f64; 3]>

Find real roots of cubic equation.

The implementation is not (yet) fully robust, but it does handle the case where c3 is zero (in that case, solving the quadratic equation).

See: http://mathworld.wolfram.com/CubicFormula.html

Returns values of x for which c0 + c1 x + c2 x² + c3 x³ = 0.