Struct EveningDojiStar 

pub struct EveningDojiStar { /* private fields */ }

Evening Doji Star — a 3-bar bearish top reversal. A long white bar extends the advance, a doji gaps up above it (the star of indecision), then a black bar gaps back down and closes deep into the first body, confirming the turn.

long body = |close − open| >= 0.5 * (high − low)
doji      = |close − open| <= 0.1 * (high − low)
bar1 white & long
bar2 doji, body gaps UP above bar1 body       (min(o2,c2) > close1)
bar3 black, body gaps DOWN below the doji      (max(o3,c3) < min(o2,c2))
bar3 closes deep into bar1 body                (close3 < close1 − penetration·body1)

Output is −1.0 when the pattern completes and 0.0 otherwise. Evening Doji Star is a single-direction (bearish-only) reversal, so it never emits +1.0. The first two bars always return 0.0 because the three-bar window is not yet filled. penetration is how far into the first body the third bar must close; it defaults to 0.3 (TA-Lib’s CDLEVENINGDOJISTAR default) and must lie in [0, 1). Body and doji 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, EveningDojiStar, Indicator};

let mut indicator = EveningDojiStar::new();
indicator.update(Candle::new(10.0, 15.1, 9.9, 15.0, 1.0, 0).unwrap());
indicator.update(Candle::new(17.0, 17.1, 16.9, 17.0, 1.0, 1).unwrap());
let out = indicator
    .update(Candle::new(16.0, 16.1, 11.9, 12.0, 1.0, 2).unwrap());
assert_eq!(out, Some(-1.0));

Implementations

impl EveningDojiStar

pub const fn new() -> Self

Construct an Evening Doji Star detector with the default 0.3 penetration.

pub fn with_penetration(penetration: f64) -> Result<Self>

Construct an Evening Doji Star detector with a custom penetration fraction.

penetration must lie in [0, 1).

pub fn penetration(&self) -> f64

Configured penetration fraction.

Trait Implementations

impl Clone for EveningDojiStar

fn clone(&self) -> EveningDojiStar

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EveningDojiStar

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

Formats the value using the given formatter.

impl Default for EveningDojiStar

fn default() -> Self

Returns the “default value” for a type.

impl Indicator for EveningDojiStar

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.