notebook: draw edges and arrows

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_notebook/src/debug.rs

@@ -0,0 +1,26 @@
+
+/*
+fn debug_slider(
+    ui: &mut egui::Ui,
+    id: egui::Id,
+    point: Pos2,
+    initial: f32,
+    range: std::ops::RangeInclusive<f32>,
+) -> f32 {
+    let mut val = ui.data_mut(|d| *d.get_temp_mut_or::<f32>(id, initial));
+    let nudge = vec2(10.0, 10.0);
+    let slider = Rect::from_min_max(point - nudge, point + nudge);
+    let label = Rect::from_min_max(point + nudge * 2.0, point - nudge * 2.0);
+
+    let old_val = val;
+    ui.put(slider, egui::Slider::new(&mut val, range));
+    ui.put(label, egui::Label::new(format!("{val}")));
+
+    if val != old_val {
+        ui.data_mut(|d| d.insert_temp(id, val))
+    }
+
+    val
+}
+*/
+