Function interpolator

Interpolate cubic or quadratic bezier

const i = interpolator(myBezier);

// Get point at 50%
i(0.5); // { x, y }

interpolator(q): ((amount: number) => Point)
Parameters
- q: QuadraticBezier | CubicBezier
Returns ((amount: number) => Point)
- - (amount): Point
  - Parameters
    - amount: number
    Returns Point