Reorganize repository

crates/ratatui/src/spectrum.rs

@@ -0,0 +1,62 @@
+use ratatui::buffer::Buffer;
+use ratatui::layout::Rect;
+use ratatui::style::Color;
+use ratatui::widgets::Widget;
+
+const BLOCKS: [char; 8] = ['\u{2581}', '\u{2582}', '\u{2583}', '\u{2584}', '\u{2585}', '\u{2586}', '\u{2587}', '\u{2588}'];
+
+pub struct Spectrum<'a> {
+    data: &'a [f32; 32],
+}
+
+impl<'a> Spectrum<'a> {
+    pub fn new(data: &'a [f32; 32]) -> Self {
+        Self { data }
+    }
+}
+
+impl Widget for Spectrum<'_> {
+    fn render(self, area: Rect, buf: &mut Buffer) {
+        if area.width == 0 || area.height == 0 {
+            return;
+        }
+
+        let height = area.height as f32;
+        let band_width = area.width as usize / 32;
+        if band_width == 0 {
+            return;
+        }
+
+        for (band, &mag) in self.data.iter().enumerate() {
+            let bar_height = mag * height;
+            let full_cells = bar_height as usize;
+            let frac = bar_height - full_cells as f32;
+            let frac_idx = (frac * 8.0) as usize;
+
+            let x_start = area.x + (band * band_width) as u16;
+
+            for row in 0..area.height as usize {
+                let y = area.y + area.height - 1 - row as u16;
+                let ratio = row as f32 / area.height as f32;
+                let color = if ratio < 0.33 {
+                    Color::Rgb(40, 180, 80)
+                } else if ratio < 0.66 {
+                    Color::Rgb(220, 180, 40)
+                } else {
+                    Color::Rgb(220, 60, 40)
+                };
+                for dx in 0..band_width as u16 {
+                    let x = x_start + dx;
+                    if x >= area.x + area.width {
+                        break;
+                    }
+                    if row < full_cells {
+                        buf[(x, y)].set_char(BLOCKS[7]).set_fg(color);
+                    } else if row == full_cells && frac_idx > 0 {
+                        buf[(x, y)].set_char(BLOCKS[frac_idx - 1]).set_fg(color);
+                    }
+                }
+            }
+        }
+    }
+}