Added basic oscilloscope functionality to watch the waveform

The triggering algorithm isn't great at the moment. Seems the
interesting signals end up crossing zero a few times. I need to take
things like maxima into account as well.

I'm also running out of vertical space. I need to start making the GUI a
bit smarter, and allow turning some of these graphs on/off at runtime.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/transforms.rs b/src/transforms.rs
index 0ff3e17..72aad8a 100644
--- a/src/transforms.rs
+++ b/src/transforms.rs
@@ -227,3 +227,12 @@ fn c4_is_correct() {
 fn f5_is_correct() {
     assert_eq!(hz_to_pitch(698.46), "F5 +0");
 }
+
+
+pub fn align_to_rising_edge(samples: &Vec<f64>) -> Vec<f64> {
+    samples.iter()
+        .skip_while(|x| !x.is_sign_negative())
+        .skip_while(|x| x.is_sign_negative())
+        .cloned()
+        .collect()
+}