Struct CantPiece 

pub struct CantPiece {
    pub length: f64,
    pub form: CantForm,
}

One piece of a CantLaw: a form over a plan length.

Fields

length: f64

Plan length the piece covers. Positive and finite when well formed.

form: CantForm

The law over the piece’s own xi = s / length.

Implementations

impl CantPiece

pub const fn new(length: f64, form: CantForm) -> CantPiece

A piece of form over length.

pub fn constant(length: f64, cant: f64) -> CantPiece

A constant cant.

pub fn linear(length: f64, start: f64, end: f64) -> CantPiece

A linear transition from start to end.

pub fn bloss(length: f64, start: f64, end: f64) -> CantPiece

A Bloss transition: start + (end - start) (3 - 2 xi) xi^2.

pub fn helmert(length: f64, start: f64, end: f64) -> [CantPiece; 2]

A Helmert (two-parabola) transition from start to end over length, as its two halves.

Over the whole transition, with x = s / length, the cant is start + 2 dD x^2 up to x = 1/2 and end - 2 dD (1 - x)^2 after. Each half is written in its own xi: start + dD/2 xi^2, then start + dD/2 + dD xi - dD/2 xi^2.

pub fn cosine(length: f64, start: f64, end: f64) -> CantPiece

A half-cosine transition from start to end.

pub fn sine(length: f64, start: f64, end: f64) -> CantPiece

A sine transition from start to end.

pub fn viennese_bend(length: f64, start: f64, end: f64) -> CantPiece

A Viennese bend from bank angle start to end, radians.

pub const fn about_rail( length: f64, rail: RailSide, elevation: f64, ) -> CantPiece

A pivot piece rotating about the held rail, whose head stands elevation above the profile (CantForm::AboutRail).

Trait Implementations

impl Clone for CantPiece

fn clone(&self) -> CantPiece

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CantPiece

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CantPiece

fn deserialize<__D>( __deserializer: __D, ) -> Result<CantPiece, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for CantPiece

fn eq(&self, other: &CantPiece) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for CantPiece

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CantPiece