WIP.

src/main.rs

 pub mod image;
 pub mod slide;
 
-use crate::slide::introduction::Introduction;
-use crate::slide::title::Title;
+use crate::slide::s1_title::Title;
+use crate::slide::s2_introduction::Introduction;
+use crate::slide::s3_complexity::Complexity;
 use crate::slide::Slide;
 use eframe::egui::style::{Margin, Widgets};
 use eframe::egui::{
@@ -45,6 +46,7 @@ impl Default for Cartoon {
             slides: vec![
                 Box::new(Title::default()) as Box<dyn Slide>,
                 Box::new(Introduction::default()),
+                Box::new(Complexity::default()),
             ],
             slide_index: 0,
         }

src/slide.rs

 use eframe::egui::{Context, Ui};
 use eframe::{egui, epi};
 
-pub mod introduction;
-pub mod title;
+pub mod s1_title;
+pub mod s2_introduction;
+pub mod s3_complexity;
 
 pub trait Slide {
     fn show(&mut self, ui: &mut Ui, ctx: &Context);

src/slide/s3_complexity.rs

+use crate::egui::{Context, Ui, Window};
+use crate::{Key, Slide};
+use eframe::egui::text_edit::{CCursorRange, CursorRange, TextEditState};
+use eframe::egui::{Align, Align2, Frame, Layout, TextEdit, Vec2};
+use eframe::epaint::text::cursor::{CCursor, Cursor};
+
+#[derive(Default)]
+pub struct Complexity {}
+
+impl Slide for Complexity {
+    fn show(&mut self, ui: &mut Ui, ctx: &Context) {
+        Window::new("complexity")
+            .title_bar(false)
+            .resizable(false)
+            .frame(Frame::none())
+            .anchor(Align2::CENTER_CENTER, Vec2::ZERO)
+            .fixed_size(Vec2::new(440.0, 100.0))
+            .show(ctx, |ui| {
+                ui.vertical_centered_justified(|ui| {
+                    let mut state = TextEditState::default();
+                    state.set_ccursor_range(Some(CCursorRange::two(
+                        CCursor::new(0),
+                        CCursor::new(7),
+                    )));
+                    let text_edit =
+                        ui.text_edit_singleline(&mut "Complex Rules ➡ Complex Results?");
+                    text_edit.request_focus();
+                    TextEdit::store_state(ctx, text_edit.id, state);
+                });
+            });
+    }
+}