flatten workspace into 1 crate

src/sampler/sample_viewer.rs

@@ -0,0 +1,52 @@
+use crate::*;
+use std::ops::Deref;
+use ratatui::{prelude::Rect, widgets::{Widget, canvas::{Canvas, Points, Line}}};
+
+const EMPTY: &[(f64, f64)] = &[(0., 0.), (1., 1.), (2., 2.), (0., 2.), (2., 0.)];
+
+pub struct SampleViewer(pub Option<Arc<RwLock<Sample>>>);
+render!(<Tui>|self: SampleViewer|render(|to|{
+    let [x, y, width, height] = to.area();
+    let area = Rect { x, y, width, height };
+    let min_db = -40.0;
+    let (x_bounds, y_bounds, lines): ([f64;2], [f64;2], Vec<Line>) =
+        if let Some(sample) = &self.0 {
+            let sample = sample.read().unwrap();
+            let start  = sample.start  as f64;
+            let end    = sample.end    as f64;
+            let length = end - start;
+            let step   = length / width as f64;
+            let mut t = start;
+            let mut lines = vec![];
+            while t < end {
+                let chunk = &sample.channels[0][t as usize..((t + step) as usize).min(sample.end)];
+                let total: f32 = chunk.iter().map(|x|x.abs()).sum();
+                let count = chunk.len() as f32;
+                let meter = 10. * (total / count).log10();
+                let x = t as f64;
+                let y = meter as f64;
+                lines.push(Line::new(x, min_db, x, y, Color::Green));
+                t += step / 2.;
+            }
+            (
+                [sample.start as f64, sample.end as f64],
+                [min_db, 0.],
+                lines
+            )
+        } else {
+            (
+                [0.0, width  as f64],
+                [0.0, height as f64],
+                vec![
+                    Line::new(0.0, 0.0, width as f64, height as f64, Color::Red),
+                    Line::new(width as f64, 0.0, 0.0, height as f64, Color::Red),
+                ]
+            )
+        };
+    Canvas::default().x_bounds(x_bounds).y_bounds(y_bounds).paint(|ctx|{
+        for line in lines.iter() {
+            ctx.draw(line)
+        }
+    }).render(area, &mut to.buffer);
+    Ok(())
+}));