Struct StalledPattern 

pub struct StalledPattern { /* private fields */ }

Stalled Pattern (also called Deliberation) — a 3-bar bearish reversal warning. Two long white candles push higher, then a small-bodied white candle opens at or near the top of the second body and barely advances — the rally is running out of breath, hinting that buyers are losing control.

long body  = |close − open| >= 0.5 * (high − low)
small body = |close − open| <= 0.3 * (high − low)
bar1, bar2 long white; bar3 small white
rising closes: close3 > close2 > close1
bar3 rides the shoulder: open3 >= close2 − 0.1 * (high2 − low2)

Output is −1.0 when the pattern completes and 0.0 otherwise. Stalled Pattern is a single-direction (bearish-only) warning, so it never emits +1.0. The first two bars always return 0.0 because the three-bar window is not yet filled. Body 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, Indicator, StalledPattern};

let mut indicator = StalledPattern::new();
indicator.update(Candle::new(10.0, 12.05, 9.9, 12.0, 1.0, 0).unwrap());
indicator.update(Candle::new(11.0, 14.05, 10.9, 14.0, 1.0, 1).unwrap());
let out = indicator
    .update(Candle::new(14.0, 14.6, 13.95, 14.15, 1.0, 2).unwrap());
assert_eq!(out, Some(-1.0));

Implementations

impl StalledPattern

pub const fn new() -> Self

Construct a new Stalled Pattern detector.

Trait Implementations

impl Clone for StalledPattern

fn clone(&self) -> StalledPattern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StalledPattern

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

Formats the value using the given formatter.

impl Default for StalledPattern

fn default() -> StalledPattern

Returns the “default value” for a type.

impl Indicator for StalledPattern

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.