1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
use super::{SamplesPerSecond, Hz};
type Phase = f32; // Phase will always be between 0.0 and 1.0.
pub struct PhasorIter {
pub phase: Phase,
pub frequency: Hz,
sample_rate: SamplesPerSecond,
}
impl PhasorIter {
fn new(frequency: Hz, sample_rate: SamplesPerSecond) -> Self {
Self { phase: 0.0, frequency, sample_rate }
}
}
impl Iterator for PhasorIter {
type Item = Phase;
fn next(&mut self) -> Option<Self::Item> {
self.phase += (self.frequency / self.sample_rate);
if self.phase > 1.0 { self.phase -= 1.0; }
Some(self.phase)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_produces_expected_next_value() {
let mut phasor = PhasorIter::new(10.0, 100.0);
assert_eq!(phasor.next(), Some(0.1))
}
#[test]
fn it_produces_expected_next_values() {
let phasor = PhasorIter::new(10.0, 100.0);
let next = phasor.take(11);
assert_eq!(0.1, next.last().unwrap())
// assert_eq!([0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 0.1], next)
}
}
|
