Struct Tangent 

pub struct Tangent {
    pub c: [f64; 3],
    /* private fields */
}

A gnomonic tangent plane: its centre and local east and north unit vectors. Standard coordinates are radians, east and north positive.

Fields

c: [f64; 3]

Unit vector of the tangent point.

Implementations

impl Tangent

pub fn at(c: [f64; 3]) -> Option<Self>

The plane touching the sphere at unit vector c (need not be normalised). None at the poles’ exact axis, where east is undefined.

pub fn at_radec(ra: f64, dec: f64) -> Option<Self>

The plane touching (ra, dec).

pub fn project(&self, u: &[f64; 3]) -> Option<(f64, f64)>

Standard coordinates of unit vector u; None behind the plane.

pub fn deproject(&self, xi: f64, eta: f64) -> (f64, f64)

(RA, Dec) radians of standard coordinates (xi, eta).

Trait Implementations

impl Clone for Tangent

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Tangent

impl Debug for Tangent

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.