Refactoring

seq/src/widgets/vu_meter.rs

@@ -0,0 +1,67 @@
+use ratatui::buffer::Buffer;
+use ratatui::layout::Rect;
+use ratatui::style::Color;
+use ratatui::widgets::Widget;
+
+pub struct VuMeter {
+    left: f32,
+    right: f32,
+}
+
+impl VuMeter {
+    pub fn new(left: f32, right: f32) -> Self {
+        Self { left, right }
+    }
+
+    fn level_to_color(level: f32) -> Color {
+        if level > 0.9 {
+            Color::Red
+        } else if level > 0.7 {
+            Color::Yellow
+        } else {
+            Color::Green
+        }
+    }
+}
+
+impl Widget for VuMeter {
+    fn render(self, area: Rect, buf: &mut Buffer) {
+        if area.width < 2 || area.height == 0 {
+            return;
+        }
+
+        let height = area.height as usize;
+        let left_col = area.x;
+        let right_col = area.x + area.width - 1;
+
+        let left_level = (self.left.clamp(0.0, 1.0) * height as f32) as usize;
+        let right_level = (self.right.clamp(0.0, 1.0) * height as f32) as usize;
+
+        for row in 0..height {
+            let y = area.y + area.height - 1 - row as u16;
+            let level_at_row = (row as f32 + 0.5) / height as f32;
+            let color = Self::level_to_color(level_at_row);
+
+            if row < left_level {
+                buf[(left_col, y)].set_char('█').set_fg(color);
+            } else {
+                buf[(left_col, y)].set_char('░').set_fg(Color::DarkGray);
+            }
+
+            if row < right_level {
+                buf[(right_col, y)].set_char('█').set_fg(color);
+            } else {
+                buf[(right_col, y)].set_char('░').set_fg(Color::DarkGray);
+            }
+        }
+
+        if area.width > 2 {
+            for row in 0..height {
+                let y = area.y + row as u16;
+                for x in (area.x + 1)..(area.x + area.width - 1) {
+                    buf[(x, y)].set_char(' ');
+                }
+            }
+        }
+    }
+}