Struct ThreeLineStrike 

pub struct ThreeLineStrike { /* private fields */ }

Three Line Strike — a 4-bar pattern: three candles marching in one direction (a three-soldiers / three-crows advance) followed by a fourth candle of the opposite colour that opens beyond the third candle and closes back past the first candle’s open, “striking” through the whole run.

Bullish (+1.0):

bar1..bar3 green, each opening inside the prior body and closing higher
bar4 red & opens above bar3's close & closes below bar1's open

Bearish (−1.0): the mirror — three falling red candles struck by a green bar4 that opens below bar3’s close and closes above bar1’s open.

Output is 0.0 otherwise. The first three bars always return 0.0 because the four-bar window is not yet filled. 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 bullish, −1.0 bearish, 0.0 no pattern — so it drops straight into a machine-learning feature matrix where the bullish and bearish variants occupy a single dimension.

Example

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

let mut indicator = ThreeLineStrike::new();
indicator.update(Candle::new(10.0, 11.1, 9.9, 11.0, 1.0, 0).unwrap());
indicator.update(Candle::new(10.5, 12.1, 10.4, 12.0, 1.0, 1).unwrap());
indicator.update(Candle::new(11.5, 13.1, 11.4, 13.0, 1.0, 2).unwrap());
let out = indicator
    .update(Candle::new(13.5, 13.6, 9.4, 9.5, 1.0, 3).unwrap());
assert_eq!(out, Some(1.0));

Implementations

impl ThreeLineStrike

pub const fn new() -> Self

Construct a new Three Line Strike detector.

Trait Implementations

impl Clone for ThreeLineStrike

fn clone(&self) -> ThreeLineStrike

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ThreeLineStrike

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

Formats the value using the given formatter.

impl Default for ThreeLineStrike

fn default() -> ThreeLineStrike

Returns the “default value” for a type.

impl Indicator for ThreeLineStrike

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.