Struct AndrewsPitchfork 

pub struct AndrewsPitchfork { /* private fields */ }

Andrews Pitchfork — Alan Andrews’ median-line tool drawn from the three most recent swing pivots, projected forward to the current bar.

detect alternating swing highs/lows with a `strength`-bar fractal
P0 = handle (oldest of the last three), P1, P2 = the next two
M  = midpoint of P1 and P2
median(t) = P0 + slope·(t − t0)          slope = (M − P0) / (M_t − t0)
upper / lower = median(t) offset by the vertical gap to the higher / lower anchor

The pitchfork projects a “fork” of three parallel lines: a central median line drawn from a starting pivot through the midpoint of a later swing, plus two parallels passing through that swing’s high and low. Price tends to oscillate around the median line and find support/resistance at the parallels. This streaming version detects the pivots automatically with a symmetric fractal of half-width strength (so each pivot is confirmed strength bars late) and keeps the three most recent alternating swings.

Because it depends on swing structure, readiness is data-dependent: the first output appears once three alternating pivots have been confirmed. warmup_period returns the minimum bars to confirm a single pivot. Each update is O(strength).

Example

use wickra_core::{Candle, Indicator, AndrewsPitchfork};

let mut indicator = AndrewsPitchfork::new(2).unwrap();
let mut last = None;
for i in 0..120 {
    let base = 100.0 + (f64::from(i) * 0.4).sin() * 10.0;
    let c = Candle::new(base, base + 1.0, base - 1.0, base, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
// A swinging series eventually establishes a pitchfork.
let _ = last;

Implementations

impl AndrewsPitchfork

pub fn new(strength: usize) -> Result<Self>

Construct an Andrews Pitchfork with the given fractal strength (bars on each side of a pivot).

Errors

Returns Error::PeriodZero if strength == 0.

pub const fn strength(&self) -> usize

Configured fractal strength.

pub const fn value(&self) -> Option<AndrewsPitchforkOutput>

Current value if available.

Trait Implementations

impl Clone for AndrewsPitchfork

fn clone(&self) -> AndrewsPitchfork

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AndrewsPitchfork

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

Formats the value using the given formatter.

impl Indicator for AndrewsPitchfork

type Input = Candle

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = AndrewsPitchforkOutput

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<AndrewsPitchforkOutput>

Feed one new data point into the indicator and return the freshly computed output, or None if the indicator is still warming up.

fn reset(&mut self)

Reset all internal state, leaving the indicator equivalent to a freshly constructed instance with the same parameters.

fn warmup_period(&self) -> usize

Number of inputs required before the first non-None output can be produced.

fn is_ready(&self) -> bool

Whether the indicator has emitted at least one value since the last reset.

fn name(&self) -> &'static str

Stable, human-readable indicator name. Used by chaining and diagnostics.