Euclidean + hue rotation

src/views/render.rs

@@ -16,7 +16,9 @@ use crate::app::App;
 use crate::engine::{LinkState, SequencerSnapshot};
 use crate::model::{SourceSpan, StepContext, Value};
 use crate::page::Page;
-use crate::state::{FlashKind, Modal, PanelFocus, PatternField, SidePanel, StackCache};
+use crate::state::{
+    EuclideanField, FlashKind, Modal, PanelFocus, PatternField, SidePanel, StackCache,
+};
 use crate::theme;
 use crate::views::highlight::{self, highlight_line, highlight_line_with_runtime};
 use crate::widgets::{
@@ -1038,5 +1040,131 @@ fn render_modal(frame: &mut Frame, app: &App, snapshot: &SequencerSnapshot, term
                 hint_area,
             );
         }
+        Modal::EuclideanDistribution {
+            source_step,
+            field,
+            pulses,
+            steps,
+            rotation,
+            ..
+        } => {
+            let width = 50u16;
+            let height = 11u16;
+            let x = (term.width.saturating_sub(width)) / 2;
+            let y = (term.height.saturating_sub(height)) / 2;
+            let area = Rect::new(x, y, width, height);
+
+            let block = Block::bordered()
+                .title(format!(" Euclidean Distribution (Step {:02}) ", source_step + 1))
+                .border_style(Style::default().fg(theme.modal.input));
+
+            let inner = block.inner(area);
+            frame.render_widget(Clear, area);
+
+            // Fill background with theme color
+            let bg_fill = " ".repeat(area.width as usize);
+            for row in 0..area.height {
+                let line_area = Rect::new(area.x, area.y + row, area.width, 1);
+                frame.render_widget(
+                    Paragraph::new(bg_fill.clone()).style(Style::new().bg(theme.ui.bg)),
+                    line_area,
+                );
+            }
+
+            frame.render_widget(block, area);
+
+            let fields = [
+                (
+                    "Pulses",
+                    pulses.as_str(),
+                    *field == EuclideanField::Pulses,
+                ),
+                ("Steps", steps.as_str(), *field == EuclideanField::Steps),
+                (
+                    "Rotation",
+                    rotation.as_str(),
+                    *field == EuclideanField::Rotation,
+                ),
+            ];
+
+            for (i, (label, value, selected)) in fields.iter().enumerate() {
+                let row_y = inner.y + i as u16;
+                if row_y >= inner.y + inner.height {
+                    break;
+                }
+
+                let (label_style, value_style) = if *selected {
+                    (
+                        Style::default()
+                            .fg(theme.hint.key)
+                            .add_modifier(Modifier::BOLD),
+                        Style::default()
+                            .fg(theme.ui.text_primary)
+                            .bg(theme.ui.surface),
+                    )
+                } else {
+                    (
+                        Style::default().fg(theme.ui.text_muted),
+                        Style::default().fg(theme.ui.text_primary),
+                    )
+                };
+
+                let label_area = Rect::new(inner.x + 1, row_y, 14, 1);
+                let value_area = Rect::new(inner.x + 16, row_y, inner.width.saturating_sub(18), 1);
+
+                frame.render_widget(
+                    Paragraph::new(format!("{label}:")).style(label_style),
+                    label_area,
+                );
+                frame.render_widget(Paragraph::new(*value).style(value_style), value_area);
+            }
+
+            let preview_y = inner.y + 4;
+            if preview_y < inner.y + inner.height {
+                let pulses_val: usize = pulses.parse().unwrap_or(0);
+                let steps_val: usize = steps.parse().unwrap_or(0);
+                let rotation_val: usize = rotation.parse().unwrap_or(0);
+                let preview = format_euclidean_preview(pulses_val, steps_val, rotation_val);
+                let preview_line = Line::from(vec![
+                    Span::styled("Preview: ", Style::default().fg(theme.ui.text_muted)),
+                    Span::styled(preview, Style::default().fg(theme.modal.input)),
+                ]);
+                let preview_area =
+                    Rect::new(inner.x + 1, preview_y, inner.width.saturating_sub(2), 1);
+                frame.render_widget(Paragraph::new(preview_line), preview_area);
+            }
+
+            let hint_area = Rect::new(inner.x, inner.y + inner.height - 1, inner.width, 1);
+            let hint_line = Line::from(vec![
+                Span::styled("↑↓", Style::default().fg(theme.hint.key)),
+                Span::styled(" nav  ", Style::default().fg(theme.hint.text)),
+                Span::styled("←→", Style::default().fg(theme.hint.key)),
+                Span::styled(" adjust  ", Style::default().fg(theme.hint.text)),
+                Span::styled("Enter", Style::default().fg(theme.hint.key)),
+                Span::styled(" apply  ", Style::default().fg(theme.hint.text)),
+                Span::styled("Esc", Style::default().fg(theme.hint.key)),
+                Span::styled(" cancel", Style::default().fg(theme.hint.text)),
+            ]);
+            frame.render_widget(Paragraph::new(hint_line), hint_area);
+        }
     }
 }
+
+fn format_euclidean_preview(pulses: usize, steps: usize, rotation: usize) -> String {
+    if pulses == 0 || steps == 0 || pulses > steps {
+        return "[invalid]".to_string();
+    }
+
+    let mut pattern = vec![false; steps];
+    for i in 0..pulses {
+        let pos = (i * steps) / pulses;
+        pattern[pos] = true;
+    }
+
+    if rotation > 0 {
+        pattern.rotate_left(rotation % steps);
+    }
+
+    let chars: Vec<&str> = pattern.iter().map(|&h| if h { "x" } else { "." }).collect();
+    format!("[{}]", chars.join(" "))
+}