Struct GravestoneDoji 

pub struct GravestoneDoji { /* private fields */ }

Gravestone Doji — a single-bar bearish reversal. Open, close, and low sit at the bottom of the bar while a long upper shadow shows price was pushed up hard and then sold all the way back to the open — sellers rejecting the highs.

range = high − low
doji          = |close − open| <= 0.1 * range
no lower wick = min(open, close) − low   <= 0.1 * range
long upper    = high − max(open, close)  >= 0.5 * range

Output is −1.0 when the gravestone prints and 0.0 otherwise. Gravestone Doji is a single-direction (bearish-only) shape, so it never emits +1.0. 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 bearish, 0.0 no pattern — so it drops straight into a machine-learning feature matrix as a single dimension.

Example

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

let mut indicator = GravestoneDoji::new();
// Body at the bottom, long upper shadow.
let candle = Candle::new(10.0, 14.0, 9.95, 10.0, 1.0, 0).unwrap();
assert_eq!(indicator.update(candle), Some(-1.0));

Implementations

impl GravestoneDoji

pub const fn new() -> Self

Construct a new Gravestone Doji detector.

Trait Implementations

impl Clone for GravestoneDoji

fn clone(&self) -> GravestoneDoji

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GravestoneDoji

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

Formats the value using the given formatter.

impl Default for GravestoneDoji

fn default() -> GravestoneDoji

Returns the “default value” for a type.

impl Indicator for GravestoneDoji

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.