tek/src/piano_h/piano_h_notes.rs

use crate::*;
use super::note_y_iter;

pub struct PianoHorizontalNotes<'a>(pub(crate) &'a PianoHorizontal);

render!(<Tui>(self: PianoHorizontalNotes<'a>)
    |layout|Ok(Some([0, 0])),
    |render|Ok({
        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();
                    }
                }
            }
        }
    }));