Struct LadderBottom 

pub struct LadderBottom { /* private fields */ }

Ladder Bottom — a 5-bar bullish reversal. Three long black candles step the market down like rungs of a ladder, a fourth black candle finally shows an upper shadow (the first sign of buying), and a white candle then gaps up into its body to confirm the turn.

bar1, bar2, bar3 black, with consecutively lower opens AND closes
bar4 black with an upper shadow         (high4 > open4)
bar5 white, opens above bar4's body      (open5 > open4)  and closes up

Output is +1.0 when the pattern completes and 0.0 otherwise. Ladder Bottom is a single-direction (bullish-only) reversal, so it never emits −1.0. The first four bars always return 0.0 because the five-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, 0.0 no pattern — so it drops straight into a machine-learning feature matrix as a single dimension.

Example

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

let mut indicator = LadderBottom::new();
indicator.update(Candle::new(20.0, 20.1, 17.9, 18.0, 1.0, 0).unwrap());
indicator.update(Candle::new(18.0, 18.1, 15.9, 16.0, 1.0, 1).unwrap());
indicator.update(Candle::new(16.0, 16.1, 13.9, 14.0, 1.0, 2).unwrap());
indicator.update(Candle::new(14.0, 15.0, 12.4, 12.5, 1.0, 3).unwrap());
let out = indicator
    .update(Candle::new(15.0, 17.1, 14.9, 17.0, 1.0, 4).unwrap());
assert_eq!(out, Some(1.0));

Implementations

impl LadderBottom

pub const fn new() -> Self

Construct a new Ladder Bottom detector.

Trait Implementations

impl Clone for LadderBottom

fn clone(&self) -> LadderBottom

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LadderBottom

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

Formats the value using the given formatter.

impl Default for LadderBottom

fn default() -> LadderBottom

Returns the “default value” for a type.

impl Indicator for LadderBottom

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.