Struct BbTrend 

pub struct BbTrend { /* private fields */ }

BBTrend: how far a short Bollinger set has moved out of a long one.

Two band sets over the same prices, one short and one long, with the same multiplier and the same variance convention. The published value compares how far each edge of the short set sits from the matching edge of the long set:

BBTrend = 100 * (|lower_short - lower_long| - |upper_short - upper_long|) / basis_short

Positive means the short set has pushed further out at the top than at the bottom — the recent window is trending up relative to the longer one — and negative the reverse. Around zero the two sets sit concentrically, which is what a range looks like.

Both sets come from the same BollingerBands engine this crate already has, so there is one band calculation, not a second one written for this indicator. The variance convention applies to both sets: comparing a population-based set against a sample-based one would measure the convention rather than the market.

Unit: percent of the short basis. Division by a zero basis cannot arise from valid bars, whose prices are positive; should it, the value is 0.

Per-bar outputs:

• value: the BBTrend line.
• extra["upper_gap"] / extra["lower_gap"]: the two absolute edge distances it is built from, so a reader can see which side moved.

First output: with the long_len-th bar, when both sets exist. Indicator::reset clears both.

Implementations

impl BbTrend

pub fn new( short_len: usize, long_len: usize, mult: f64, variance: VarianceConvention, ) -> Self

pub fn with_defaults() -> Self

Trait Implementations

impl Clone for BbTrend

fn clone(&self) -> BbTrend

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BbTrend

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

Formats the value using the given formatter.

impl Indicator for BbTrend

fn name(&self) -> &str

fn warmup_period(&self) -> usize

fn on_bar(&mut self, bar: &Bar) -> Option<IndicatorOutput>

fn reset(&mut self)

fn on_checked_bar( &mut self, bar: &Bar, ) -> Result<Option<IndicatorOutput>, BarValidationError>

Validates a bar before forwarding it to Indicator::on_bar.

fn alerts(&self) -> Vec<IndicatorAlert>