Struct InNeck 

pub struct InNeck { /* private fields */ }

In-Neck — a 2-bar bearish continuation, slightly stronger than On-Neck. A long black candle in a decline is followed by a white candle that opens below the black bar’s low and closes just barely into the black body, around its close level. The shallow recovery still favours the sellers.

long body = |close − open| >= 0.5 * (high − low)
bar1 black & long
bar2 white, opens below bar1's low      (open2 < low1)
bar2 closes just into bar1's body        (close1 <= close2 <= close1 + 0.1 · body1)

Output is −1.0 when the pattern completes and 0.0 otherwise. In-Neck is a single-direction (bearish-only) continuation, so it never emits +1.0. The first bar always returns 0.0 because the two-bar window is not yet filled. Body and neckline thresholds follow the geometric house style rather than TA-Lib’s rolling averages. Pattern-shape check only — no trend filter is applied; combine with a trend indicator for actionable signals.

Signed ±1 encoding

This detector emits the uniform candlestick sign convention shared across the pattern family — −1.0 bearish, 0.0 no pattern — so it drops straight into a machine-learning feature matrix as a single dimension.

Example

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

let mut indicator = InNeck::new();
indicator.update(Candle::new(15.0, 15.1, 9.0, 10.0, 1.0, 0).unwrap());
let out = indicator
    .update(Candle::new(7.0, 10.3, 6.9, 10.2, 1.0, 1).unwrap());
assert_eq!(out, Some(-1.0));

Implementations

impl InNeck

pub const fn new() -> Self

Construct a new In-Neck detector.

Trait Implementations

impl Clone for InNeck

fn clone(&self) -> InNeck

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InNeck

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

Formats the value using the given formatter.

impl Default for InNeck

fn default() -> InNeck

Returns the “default value” for a type.

impl Indicator for InNeck

type Input = Candle

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

type Output = f64

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<f64>

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.