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use std::collections::VecDeque;
use super::View;
use crate::Echo;
#[derive(Clone)]
pub struct CyberCycle<V> {
view: V,
window_len: usize,
alpha: f64,
vals: VecDeque<f64>,
out: VecDeque<f64>,
}
impl<V> std::fmt::Debug for CyberCycle<V>
where
V: View,
{
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
write!(
fmt,
"CyberCycle(window_len: {}, alpha: {}, vals: {:?}, out: {:?})",
self.window_len, self.alpha, self.vals, self.out
)
}
}
#[inline(always)]
pub fn new_final(window_len: usize) -> CyberCycle<Echo> {
CyberCycle::new(Echo::new(), window_len)
}
impl<V> CyberCycle<V>
where
V: View,
{
#[inline]
pub fn new(view: V, window_len: usize) -> Self {
CyberCycle {
view,
window_len,
alpha: 2.0 / (window_len as f64 + 1.0),
vals: VecDeque::new(),
out: VecDeque::new(),
}
}
}
impl<V> View for CyberCycle<V>
where
V: View,
{
fn update(&mut self, val: f64) {
self.view.update(val);
let val = self.view.last();
if self.vals.len() >= self.window_len {
self.vals.pop_front();
self.out.pop_front();
}
self.vals.push_back(val);
if self.vals.len() < self.window_len {
self.out.push_back(0.0);
return;
}
let mut smooth: Vec<f64> = vec![0.0; self.vals.len()];
let last = self.vals.len() - 1;
for i in 3..self.vals.len() {
smooth[i] = (val
+ 2.0 * self.vals.get(i - 1).unwrap()
+ 2.0 * self.vals.get(i - 2).unwrap()
+ *self.vals.get(i - 3).unwrap())
/ 6.0
}
let cc = (1.0 - 0.5 * self.alpha).powi(2)
* (smooth[last] - 2.0 * smooth[last - 1] + smooth[last - 2])
+ 2.0 * (1.0 - self.alpha) * self.out.get(last - 1).unwrap()
- (1.0 - self.alpha).powi(2) * self.out.get(last - 2).unwrap();
self.out.push_back(cc);
}
#[inline(always)]
fn last(&self) -> f64 {
*self.out.get(self.out.len() - 1).unwrap()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::plot::plot_values;
use crate::test_data::TEST_DATA;
#[test]
fn cyber_cycle_plot() {
let mut cc = new_final(16);
let mut out: Vec<f64> = Vec::new();
for v in &TEST_DATA {
cc.update(*v);
out.push(cc.last());
}
let filename = "img/cyber_cycle.png";
plot_values(out, filename).unwrap();
}
}