Struct AccelerationBands 

pub struct AccelerationBands { /* private fields */ }

Acceleration Bands (Price Headley): SMA-smoothed bands that widen with each bar’s relative range (high − low) / (high + low).

ratio  = (high − low) / (high + low)
raw_up = high · (1 + factor · ratio)
raw_lo = low  · (1 − factor · ratio)
upper  = SMA(raw_up, period)
middle = SMA(close,  period)
lower  = SMA(raw_lo, period)

Headley’s reference parameters are period = 20, factor = 0.001 for intraday equity markets — the geometric ratio term tends to scale on fractional moves, so the literal factor is small. The bands compress in quiet markets and flare on impulsive bars, making them a momentum-biased alternative to the volatility-driven Bollinger or Keltner envelopes.

Example

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

let mut indicator = AccelerationBands::new(20, 0.001).unwrap();
let mut last = None;
for i in 0..40 {
    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 AccelerationBands

pub fn new(period: usize, factor: f64) -> Result<Self>

Construct a new Acceleration Bands indicator.

Errors

Returns Error::PeriodZero if period == 0 and Error::NonPositiveMultiplier if factor is not strictly positive and finite.

pub fn classic() -> Self

Headley’s classic configuration: period = 20, factor = 0.001.

pub const fn parameters(&self) -> (usize, f64)

Configured (period, factor).

Trait Implementations

impl Clone for AccelerationBands

fn clone(&self) -> AccelerationBands

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AccelerationBands

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

Formats the value using the given formatter.

impl Indicator for AccelerationBands

type Input = Candle

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

type Output = AccelerationBandsOutput

Type of one output value.

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

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.