Struct FallingThreeMethods 

pub struct FallingThreeMethods { /* private fields */ }

Falling Three Methods — a 5-bar bearish continuation. A long black candle is followed by three small bars that drift up but stay inside its range (a brief rest), then a second long black candle closes below the first, resuming the decline.

long body = |close − open| >= 0.5 * (high − low)
bar1 black & long
bar2, bar3, bar4 small bodies, each contained within bar1's high/low range
bar5 black, closing below bar1's close

Output is −1.0 when the pattern completes and 0.0 otherwise. Falling Three Methods is a single-direction (bearish-only) continuation, so it never emits +1.0. The first four bars always return 0.0 because the five-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, FallingThreeMethods, Indicator};

let mut indicator = FallingThreeMethods::new();
indicator.update(Candle::new(15.0, 15.1, 9.9, 10.0, 1.0, 0).unwrap());
indicator.update(Candle::new(11.0, 12.1, 10.9, 12.0, 1.0, 1).unwrap());
indicator.update(Candle::new(11.5, 12.6, 11.4, 12.5, 1.0, 2).unwrap());
indicator.update(Candle::new(12.0, 13.1, 11.9, 13.0, 1.0, 3).unwrap());
let out = indicator
    .update(Candle::new(12.5, 12.6, 8.9, 9.0, 1.0, 4).unwrap());
assert_eq!(out, Some(-1.0));

Implementations

impl FallingThreeMethods

pub const fn new() -> Self

Construct a new Falling Three Methods detector.

Trait Implementations

impl Clone for FallingThreeMethods

fn clone(&self) -> FallingThreeMethods

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FallingThreeMethods

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

Formats the value using the given formatter.

impl Default for FallingThreeMethods

fn default() -> FallingThreeMethods

Returns the “default value” for a type.

impl Indicator for FallingThreeMethods

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.