Struct WaveTrend 

pub struct WaveTrend { /* private fields */ }

LazyBear’s Wave Trend Oscillator — a two-line momentum gauge built from the typical price and three cascaded EMAs.

For each candle let ap_t = (high + low + close) / 3:

esa_t = EMA(ap, channel_period)
d_t   = EMA(|ap − esa|, channel_period)
ci_t  = (ap_t − esa_t) / (0.015 * d_t)
wt1_t = EMA(ci, average_period)
wt2_t = SMA(wt1, signal_period)

Bullish trigger: wt1 crossing above wt2 from an oversold region (typically wt1 < -60); bearish trigger: the mirror crossover above +60. The indicator is mean-reverting around zero, so it is most useful at extremes.

The canonical LazyBear defaults are (channel_period = 10, average_period = 21, signal_period = 4); warmup is channel_period + average_period + signal_period − 2.

Non-finite d (a zero-volatility seed where the absolute-deviation EMA has not yet recorded any movement) collapses the channel index to zero.

Example

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

let mut indicator = WaveTrend::classic().unwrap();
let mut last = None;
for i in 0..80 {
    let base = 100.0 + f64::from(i);
    let candle =
        Candle::new(base, base + 2.0, base - 2.0, base + 1.0, 10.0, i64::from(i)).unwrap();
    last = indicator.update(candle);
}
assert!(last.is_some());

Implementations

impl WaveTrend

pub fn new( channel_period: usize, average_period: usize, signal_period: usize, ) -> Result<Self>

Construct a new Wave Trend Oscillator with explicit periods.

Errors

Returns Error::PeriodZero if any period is 0.

pub fn classic() -> Result<Self>

LazyBear’s classic Wave Trend: (channel = 10, average = 21, signal = 4).

Errors

None in practice — all periods are non-zero.

pub const fn periods(&self) -> (usize, usize, usize)

Configured (channel_period, average_period, signal_period).

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

Current value if available.

Trait Implementations

impl Clone for WaveTrend

fn clone(&self) -> WaveTrend

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WaveTrend

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

Formats the value using the given formatter.

impl Indicator for WaveTrend

type Input = Candle

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = WaveTrendOutput

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<WaveTrendOutput>

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.