flatten arranger and piano modules

src/piano/piano_h_notes.rs

@@ -0,0 +1,32 @@
+use crate::*;
+use super::*;
+
+pub struct PianoHorizontalNotes<'a>(pub(crate) &'a PianoHorizontal);
+
+render!(Tui: |self: PianoHorizontalNotes<'a>, render|{
+    let time_start = self.0.time_start().get();
+    let note_lo    = self.0.note_lo().get();
+    let note_hi    = self.0.note_hi();
+    let note_point = self.0.note_point();
+    let source     = &self.0.buffer;
+    let [x0, y0, w, h] = render.area().xywh();
+    if h as usize != self.0.note_axis().get() {
+        panic!("area height mismatch");
+    }
+    for (area_x, screen_x) in (x0..x0+w).enumerate() {
+        for (area_y, screen_y, note) in note_y_iter(note_lo, note_hi, y0) {
+            let source_x = time_start + area_x;
+            let source_y = note_hi    - area_y;
+            // TODO: enable loop rollover:
+            //let source_x = (time_start + area_x) % source.width.max(1);
+            //let source_y = (note_hi    - area_y) % source.height.max(1);
+            let is_in_x = source_x < source.width;
+            let is_in_y = source_y < source.height;
+            if is_in_x && is_in_y {
+                if let Some(source_cell) = source.get(source_x, source_y) {
+                    *render.buffer.get_mut(screen_x, screen_y) = source_cell.clone();
+                }
+            }
+        }
+    }
+});