Struct Takuri 

pub struct Takuri { /* private fields */ }

Takuri — a single-bar bullish reversal, a stricter Dragonfly Doji. Open, close, and high sit at the very top of the bar with a negligible upper shadow, while an exceptionally long lower shadow shows price was driven sharply down and then bid all the way back — an emphatic rejection of the lows.

range = high − low
doji            = |close − open| <= 0.1 * range
negligible upper = high − max(open, close) <= 0.05 * range
very long lower  = min(open, close) − low   >= 0.7  * range

Output is +1.0 when the Takuri prints and 0.0 otherwise. Takuri is a single-direction (bullish-only) shape, so it never emits −1.0. Its tighter upper-shadow and longer lower-shadow thresholds make it a strict subset of crate::DragonflyDoji. Body and shadow thresholds follow the geometric house style (fixed fractions of the bar range) 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 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, Takuri};

let mut indicator = Takuri::new();
// Body at the top, very long lower shadow.
let candle = Candle::new(10.0, 10.05, 7.0, 10.0, 1.0, 0).unwrap();
assert_eq!(indicator.update(candle), Some(1.0));

Implementations

impl Takuri

pub const fn new() -> Self

Construct a new Takuri detector.

Trait Implementations

impl Clone for Takuri

fn clone(&self) -> Takuri

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Takuri

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

Formats the value using the given formatter.

impl Default for Takuri

fn default() -> Takuri

Returns the “default value” for a type.

impl Indicator for Takuri

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.