Struct EaseOfMovement 

pub struct EaseOfMovement { /* private fields */ }

Richard Arms’ Ease of Movement — how far price travels per unit of volume.

distance_t = (high_t + low_t)/2 − (high_{t−1} + low_{t−1})/2
EMV_t      = distance_t · (high_t − low_t) · divisor / volume_t
EOM_t      = SMA(EMV, period)_t

A large positive EMV means price climbed a long way on light volume — it moved “easily”; a value near zero means heavy volume was needed to shift price at all. The divisor only rescales the output: the conventional 1e8 keeps EMV in a readable range for typical share volumes. A bar with zero volume contributes EMV = 0 (no trading carries no signal), as does a zero-range bar. The first candle only seeds the previous midpoint, so the first value appears on candle period + 1.

Example

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

let mut indicator = EaseOfMovement::new(14).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 EaseOfMovement

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

Construct an Ease of Movement with the conventional 1e8 volume divisor.

Errors

Returns Error::PeriodZero if period == 0.

pub fn with_divisor(period: usize, divisor: f64) -> Result<Self>

Construct an Ease of Movement with an explicit volume divisor. The divisor is a pure output-scaling constant; pick whatever keeps EMV readable for your instrument’s volume magnitude.

Errors

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

pub const fn period(&self) -> usize

Configured period.

pub const fn divisor(&self) -> f64

Configured volume divisor.

Trait Implementations

impl Clone for EaseOfMovement

fn clone(&self) -> EaseOfMovement

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EaseOfMovement

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

Formats the value using the given formatter.

impl Indicator for EaseOfMovement

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.