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use std::collections::VecDeque;
use crate::View;
#[derive(Clone)]
pub struct Cumulative<V> {
view: V,
window_len: usize,
q_vals: VecDeque<f64>,
out: f64,
}
impl<V> Cumulative<V>
where
V: View,
{
#[inline]
pub fn new(view: V, window_len: usize) -> Self {
Self {
view,
window_len,
q_vals: VecDeque::new(),
out: 0.0,
}
}
}
impl<V> View for Cumulative<V>
where
V: View,
{
fn update(&mut self, val: f64) {
self.view.update(val);
let val = self.view.last();
if self.q_vals.len() >= self.window_len {
let old = self.q_vals.pop_front().unwrap();
self.out -= old;
}
self.q_vals.push_back(val);
self.out += val;
}
#[inline(always)]
fn last(&self) -> f64 {
self.out
}
}
#[cfg(test)]
mod tests {
use crate::{plot::plot_values, test_data::TEST_DATA, Echo};
use super::*;
#[test]
fn cumulative_plot() {
let mut cum = Cumulative::new(Echo::new(), TEST_DATA.len());
let mut out: Vec<f64> = Vec::with_capacity(TEST_DATA.len());
for v in &TEST_DATA {
cum.update(*v);
out.push(cum.last());
}
let filename = "img/cumulative.png";
plot_values(out, filename).unwrap();
}
}