wip: more time traits

crates/tek_core/src/lib.rs

@@ -16,7 +16,7 @@ pub(crate) use std::thread::{spawn, JoinHandle};
 pub(crate) use std::time::Duration;
 pub(crate) use atomic_float::*;
 use better_panic::{Settings, Verbosity};
-use std::ops::{Add, Sub, Mul, Div};
+use std::ops::{Add, Sub, Mul, Div, Rem};
 use std::cmp::{Ord, Eq, PartialEq};
 use std::fmt::{Debug, Display};
 

crates/tek_core/src/time.rs

@@ -1,9 +1,10 @@
 use crate::*;
+use std::iter::Iterator;
 
-pub trait TimeUnit: Mul<Self, Output=Self> + Div<Self, Output=Self> + From<f64> + Sized {}
-
-impl<T> TimeUnit for T
-    where T: Mul<Self, Output=Self> + Div<Self, Output=Self> + From<f64> + Sized {}
+pub trait TimeUnit: Mul<Self, Output=Self> + Div<Self, Output=Self>
+    + Rem<Self, Output=Self> + From<f64> + Copy {}
+impl<T> TimeUnit for T where T: Mul<Self, Output=Self> + Div<Self, Output=Self>
+    + Rem<Self, Output=Self> + From<f64> + Copy {}
 
 /// Trait for struct that defines a sample rate in hertz (samples per second)
 pub trait TimeSR<T: TimeUnit> {
@@ -27,6 +28,30 @@ pub trait TimeBPM<T: TimeUnit> {
     #[inline] fn usec_per_beat   (&self) -> T { T::from(60_000_000f64) / self.bpm() }
     /// Return the number of beats in a second
     #[inline] fn beat_per_second (&self) -> T { self.bpm() / T::from(60_000_000f64) }
+    /// Return the duration of a note in microseconds
+    #[inline] fn note_to_usec (&self, (num, den): (T, T)) -> T {
+        T::from(4.0) * self.usec_per_beat() * num / den
+    }
+    /// Return the quantized position of a moment in time given a step
+    #[inline] fn quantize (&self, step: (T, T), time: T) -> (T, T) {
+        let step = self.note_to_usec(step);
+        (time / step, time % step)
+    }
+    /// Quantize a collection of events
+    #[inline] fn quantize_into <E: Iterator<Item=(T, T)> + Sized, U> (
+        &self, step: (T, T), events: E
+    ) -> Vec<(T, U)> {
+        let step = (step.0.into(), step.1.into());
+        events
+            .map(|(time, event)|(self.quantize(step, time).0, event))
+            .collect()
+    }
+    #[inline] fn note_to_frame (&self, note: (T, T)) -> T where Self: TimeSR<T> {
+        self.usec_to_frame(self.note_to_usec(note))
+    }
+    #[inline] fn usec_to_frame (&self, usec: T) -> T where Self: TimeSR<T> {
+        usec * self.sr() / T::from(1000f64)
+    }
 }
 
 /// Trait for struct that defines a MIDI resolution in pulses per quaver (beat)
@@ -72,6 +97,12 @@ pub struct Timebase {
     /// Ticks per beat
     pub ppq: AtomicF64,
 }
+impl Default for Timebase { fn default () -> Self { Self::new(48000f64, 150f64, 96f64) } }
+impl Timebase {
+    pub fn new (s: impl Into<AtomicF64>, b: impl Into<AtomicF64>, p: impl Into<AtomicF64>) -> Self {
+        Self { sr: s.into(), bpm: b.into(), ppq: p.into() }
+    }
+}
 
 #[derive(Debug)]
 pub struct TransportTime {
@@ -133,48 +164,6 @@ pub trait TimePoint<T>: TimeFrame<T> + TimePulse<T> + TimeUsec<T> {}
 pub trait TimeSync<T>  { fn sync (&self) -> T; fn set_sync (&self, sync: T) -> T; }
 pub trait TimeQuant<T> { fn quant (&self) -> T; fn set_quant (&self, quant: T); }
 
-impl Default for Timebase {
-    fn default () -> Self { Self::new(48000f64, 150f64, 96f64) }
-}
-
-impl Timebase {
-    pub fn new (
-        sr: impl Into<AtomicF64>, bpm: impl Into<AtomicF64>, ppq: impl Into<AtomicF64>
-    ) -> Self {
-        Self { sr: sr.into(), bpm: bpm.into(), ppq: ppq.into() }
-    }
-
-    #[inline] pub fn note_to_usec (&self, (num, den): (f64, f64)) -> f64 {
-        4.0 * self.usec_per_beat() * num / den
-    }
-
-    #[inline] pub fn note_to_frame (&self, note: (f64, f64)) -> f64 {
-        self.usec_to_frame(self.note_to_usec(note))
-    }
-    #[inline] fn usec_to_frame (&self, usec: f64) -> f64 {
-        usec * self.sr() / 1000.0
-    }
-
-    #[inline] pub fn quantize (
-        &self, step: (f64, f64), time: f64
-    ) -> (f64, f64) {
-        let step = self.note_to_usec(step);
-        (time / step, time % step)
-    }
-
-    #[inline] pub fn quantize_into <E, T> (
-        &self, step: (f64, f64), events: E
-    ) -> Vec<(f64, T)>
-        where E: std::iter::Iterator<Item=(f64, T)> + Sized
-    {
-        let step = (step.0.into(), step.1.into());
-        events
-            .map(|(time, event)|(self.quantize(step, time).0, event))
-            .collect()
-    }
-
-}
-
 /// (pulses, name)
 pub const NOTE_DURATIONS: [(usize, &str);26] = [
     (1,    "1/384"),