pub fn offset_point2(
curve: &Curve2,
distance: f64,
t: f64,
) -> Result<DVec2, GeomError>Expand description
The point of the offset by distance to the left of a 2D curve at its
parameter t: B(t) + d normalise(Z x B'(t)).
§Errors
The basis’s evaluation errors, and GeomError::Degenerate where its
tangent vanishes.