Enum ChartAggregateFn 

pub enum ChartAggregateFn {
    Mean,
    Sum,
    Min,
    Max,
    First,
    Last,
    Custom(Rc<dyn Fn(&[f32]) -> f32>),
}

A reduction applied to the numeric values within one bucket.

Variants

Mean

Arithmetic mean of the bucket’s values (0.0 for an empty bucket).

Sum

Sum of the bucket’s values.

Min

Smallest value in the bucket.

Max

Largest value in the bucket.

First

The bucket’s first value.

Last

The bucket’s last value.

Custom(Rc<dyn Fn(&[f32]) -> f32>)

A caller-supplied reduction.

Implementations

impl ChartAggregateFn

pub fn apply(&self, values: &[f32]) -> f32

Apply the reduction to a bucket’s values.

On an empty slice, every built-in variant returns 0.0 (Mean/Min/Max/First/Last) or the empty sum (Sum, also 0.0) — a uniform, unsurprising convention rather than Min/Max leaking their fold seed (±INFINITY) into a chart value. Custom returns whatever the supplied closure computes for &[]. No internal caller actually passes an empty slice — compute_bucket_datum bails out before calling apply for an empty bucket — so this only bites a direct caller.

Trait Implementations

impl Clone for ChartAggregateFn

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChartAggregateFn

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

Formats the value using the given formatter.