Struct ThreeInside 

pub struct ThreeInside { /* private fields */ }

Three Inside Up / Down — a confirmed Harami: the first two bars form a Harami and the third bar confirms direction by closing beyond the first bar’s body.

Three Inside Up (+1.0):

1. Bar 1 is a long red candle.
2. Bar 2 is a small green candle whose body sits inside Bar 1’s body.
3. Bar 3 is a green candle whose close exceeds Bar 1’s open.

Three Inside Down (−1.0): the mirror — long green, small red inside, red closing below Bar 1’s open.

Pattern-shape check only — no trend filter is applied; combine with a trend indicator for actionable signals.

Signed ±1 encoding

This detector already 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 of the pattern occupy a single dimension.

Example

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

let mut indicator = ThreeInside::new();
indicator.update(Candle::new(12.0, 12.5, 9.5, 10.0, 1.0, 0).unwrap());
indicator.update(Candle::new(10.5, 11.5, 10.4, 11.0, 1.0, 1).unwrap());
let out = indicator
    .update(Candle::new(11.0, 13.0, 10.9, 12.5, 1.0, 2).unwrap());
assert_eq!(out, Some(1.0));

Implementations

impl ThreeInside

pub const fn new() -> Self

Construct a new Three Inside Up / Down detector.

Trait Implementations

impl Clone for ThreeInside

fn clone(&self) -> ThreeInside

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ThreeInside

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

Formats the value using the given formatter.

impl Default for ThreeInside

fn default() -> ThreeInside

Returns the “default value” for a type.

impl Indicator for ThreeInside

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.