max / audiofiles

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1	//! Waveform rendering widget: custom egui Painter-based display with playback position and click-to-seek.
2
3	use egui;
4
5	use audiofiles_core::analysis::waveform::WaveformData;
6
7	use crate::ui::theme;
8
9	/// Draw a waveform display. Returns the response for click-to-seek handling.
10	pub fn draw_waveform(
11	ui: &mut egui::Ui,
12	waveform: &WaveformData,
13	playback_pos: Option<f32>,
14	height: f32,
15	) -> egui::Response {
16	let available_width = ui.available_width();
17	let size = egui::vec2(available_width, height);
18	let (rect, response) = ui.allocate_exact_size(size, egui::Sense::click());
19
20	if !ui.is_rect_visible(rect) {
21	return response;
22	}
23
24	let painter = ui.painter_at(rect);
25
26	// Dark background
27	painter.rect_filled(rect, 4.0, theme::bg_primary());
28
29	// Center line (zero crossing)
30	let center_y = rect.center().y;
31	painter.line_segment(
32	[
33	egui::pos2(rect.left(), center_y),
34	egui::pos2(rect.right(), center_y),
35	],
36	egui::Stroke::new(0.5, theme::text_muted()),
37	);
38
39	// Draw waveform peaks
40	let num_buckets = waveform.num_buckets;
41	if num_buckets > 0 && !waveform.peaks.is_empty() {
42	let bucket_width = rect.width() / num_buckets as f32;
43	let half_height = rect.height() / 2.0;
44
45	for i in 0..num_buckets {
46	let pair_idx = i * 2;
47	if pair_idx + 1 >= waveform.peaks.len() {
48	break;
49	}
50	let min_val = waveform.peaks[pair_idx];
51	let max_val = waveform.peaks[pair_idx + 1];
52
53	let x = rect.left() + (i as f32 + 0.5) * bucket_width;
54	let y_min = center_y - max_val * half_height;
55	let y_max = center_y - min_val * half_height;
56
57	painter.line_segment(
58	[egui::pos2(x, y_min), egui::pos2(x, y_max)],
59	egui::Stroke::new(1.0, theme::accent_green()),
60	);
61	}
62	}
63
64	// Playback position line
65	if let Some(pos) = playback_pos {
66	let x = rect.left() + pos.clamp(0.0, 1.0) * rect.width();
67	painter.line_segment(
68	[egui::pos2(x, rect.top()), egui::pos2(x, rect.bottom())],
69	egui::Stroke::new(1.5, theme::text_primary()),
70	);
71	}
72
73	response
74	}
75