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-rw-r--r--klangfarbrs/src/lib.rs2
-rw-r--r--klangfarbrs/src/line.rs49
-rw-r--r--klangfarbrs/src/phasor.rs7
-rw-r--r--klangfarbrs/src/utils.rs10
4 files changed, 38 insertions, 30 deletions
diff --git a/klangfarbrs/src/lib.rs b/klangfarbrs/src/lib.rs
index e64246c..0d78e01 100644
--- a/klangfarbrs/src/lib.rs
+++ b/klangfarbrs/src/lib.rs
@@ -22,6 +22,8 @@ use osc::{Osc, Waveform};
pub mod envelope;
use envelope::Envelope;
+mod utils;
+
/// Aliasing some types to distinguish various audio properties.
type Sample = f32;
type SamplesPerSecond = f32;
diff --git a/klangfarbrs/src/line.rs b/klangfarbrs/src/line.rs
index f57b103..5f862a8 100644
--- a/klangfarbrs/src/line.rs
+++ b/klangfarbrs/src/line.rs
@@ -1,19 +1,25 @@
use super::{Millisecond, Amplitude, SamplesPerSecond};
+use super::utils::*;
pub struct Line {
- pub start: Amplitude,
- pub end: Amplitude,
- pub duration: Millisecond,
- pub index: u32,
+ index: u32,
+ samples: u32,
slope: f32,
- samples: u32
+ y_intercept: f32,
}
impl Line {
pub fn new(
start: Amplitude, end: Amplitude, duration: Millisecond, sample_rate: SamplesPerSecond
) -> Self {
- Self { start, end, duration, index: 0, slope: slope(start, end, ms_to_samples(duration, sample_rate)), samples: ms_to_samples(duration, sample_rate) }
+ let number_of_samples = ms_to_samples(duration, sample_rate);
+
+ Self {
+ index: 0,
+ slope: slope(start, end, number_of_samples),
+ samples: number_of_samples,
+ y_intercept: start,
+ }
}
}
@@ -22,25 +28,16 @@ impl Iterator for Line {
fn next(&mut self) -> Option<Self::Item> {
let idx = self.index;
- let val = self.slope * idx as f32 + self.start;
+ let val = self.slope * idx as f32 + self.y_intercept;
self.index += 1;
-
+
if idx <= self.samples {
Some(val)
} else {
None
}
-
- }
-}
-
-fn slope(start: Amplitude, end: Amplitude, duration: Millisecond) -> f32 {
- return (end - start) / duration as f32 ;
-}
-fn ms_to_samples(ms: Millisecond, sample_rate: SamplesPerSecond) -> u32 {
- let multiplier = sample_rate as u32 / 1000;
- multiplier * ms
+ }
}
#[cfg(test)]
@@ -51,18 +48,18 @@ mod tests {
fn it_calculates_a_slope() {
let expected = 0.5;
let slope = slope(0.0, 0.5, 1);
- assert_eq! (expected, slope)
+ assert_eq! (slope, expected)
}
#[test]
fn it_calculates_the_next_values() {
let mut line = Line::new(0.0, 0.5, 1, 5000.0);
- assert_eq!(0.0, line.next().unwrap());
- assert_eq!(0.1, line.next().unwrap());
- assert_eq!(0.2, line.next().unwrap());
- assert_eq!(0.3, line.next().unwrap());
- assert_eq!(0.4, line.next().unwrap());
- assert_eq!(0.5, line.next().unwrap());
- assert_eq!(None, line.next());
+ assert_eq!(line.next(), Some(0.0));
+ assert_eq!(line.next(), Some(0.1));
+ assert_eq!(line.next(), Some(0.2));
+ assert_eq!(line.next(), Some(0.3));
+ assert_eq!(line.next(), Some(0.4));
+ assert_eq!(line.next(), Some(0.5));
+ assert_eq!(line.next(), None);
}
}
diff --git a/klangfarbrs/src/phasor.rs b/klangfarbrs/src/phasor.rs
index 5bfc79e..4d6a714 100644
--- a/klangfarbrs/src/phasor.rs
+++ b/klangfarbrs/src/phasor.rs
@@ -39,11 +39,10 @@ mod tests {
}
#[test]
- fn it_produces_expected_next_values() {
+ fn it_wraps_around_as_expected() {
let phasor = Phasor::new(10.0, 100.0);
- let taken_iterator = phasor.take(11);
- assert_eq!(taken_iterator.last(), Some(0.1))
- // 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)
+ let last_val = phasor.take(11).last().unwrap();
+ assert_eq!(last_val.floor(), 0.0)
}
}
diff --git a/klangfarbrs/src/utils.rs b/klangfarbrs/src/utils.rs
new file mode 100644
index 0000000..9f99e23
--- /dev/null
+++ b/klangfarbrs/src/utils.rs
@@ -0,0 +1,10 @@
+use super::{ Amplitude, Millisecond, SamplesPerSecond };
+
+pub fn slope(start: Amplitude, end: Amplitude, duration: Millisecond) -> f32 {
+ return (end - start) / duration as f32 ;
+}
+
+pub fn ms_to_samples(ms: Millisecond, sample_rate: SamplesPerSecond) -> u32 {
+ let multiplier = sample_rate as u32 / 1000;
+ multiplier * ms
+}