Struct DumplingTop 

pub struct DumplingTop { /* private fields */ }

Dumpling Top — the bearish mirror of the FryPanBottom: a gently rounded top (dome) across the window, confirmed by a close back below where it started.

over the last `period` closes:
  the maximum close sits in the middle third of the window (the "dome")
  the latest close is below the first close (the breakdown)
signal = −1 when both hold, else 0

The dumpling top is a distribution pattern: price rounds over at the top as buying fades, then rolls down through the level it rose from. Detection requires a central high (a symmetric dome, not a one-sided spike) and a close below the window’s opening level. The output is −1.0 (pattern) or 0.0.

The first value lands after period inputs; each update scans the window in O(period).

Example

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

let mut indicator = DumplingTop::new(9).unwrap();
let closes = [100.0, 102.0, 104.0, 105.0, 104.0, 102.0, 99.0, 97.0, 95.0];
let mut last = None;
for &cl in &closes {
    let c = Candle::new(cl, cl + 0.5, cl - 0.5, cl, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
assert_eq!(last, Some(-1.0));

Implementations

impl DumplingTop

pub fn new(period: usize) -> Result<Self>

Construct a Dumpling Top over period bars.

Errors

Returns Error::InvalidPeriod if period < 5.

pub const fn period(&self) -> usize

Configured window period.

pub const fn value(&self) -> Option<f64>

Current value if available.

Trait Implementations

impl Clone for DumplingTop

fn clone(&self) -> DumplingTop

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DumplingTop

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

Formats the value using the given formatter.

impl Indicator for DumplingTop

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.