Added several method implementations for menu

src/main.rs

@@ -4,6 +4,11 @@ struct State {
     mode: GameMode,
 }
 
+struct Player {
+    x: i32,
+    y: i32,
+    velocity: f32,
+}
 
 impl State {
     fn new() -> State {
@@ -11,8 +16,46 @@ impl State {
             mode: GameMode::Menu,
         }
     }
-}
 
+    fn play(&mut self, ctx: &mut BTerm) {
+        self.mode = GameMode::End;
+    }
+
+    fn restart(&mut self) {
+        self.mode = GameMode::Playing;
+    }
+
+    fn main_menu(&mut self, ctx: &mut BTerm) {
+        ctx.cls();
+        ctx.print_centered(5, "Welcome to Flappy Dragon");
+        ctx.print_centered(8, "(P) Play Game");
+        ctx.print_centered(9, "(Q) Quit Game");
+
+        if let Some(key) = ctx.key {
+            match key {
+                VirtualKeyCode::P => self.restart(),
+                VirtualKeyCode::Q => ctx.quitting = true,
+                _ => {}
+            }
+        }
+    }
+
+    fn dead(&mut self, ctx: &mut BTerm) {
+        ctx.cls();
+
+        ctx.print_centered(5, "You are dead!");
+        ctx.print_centered(8, "(P) Play Game");
+        ctx.print_centered(9, "(Q) Quit Game");
+
+        if let Some(key) = ctx.key {
+            match key {
+                VirtualKeyCode::P => self.restart(),
+                VirtualKeyCode::Q => ctx.quitting = true,
+                _ => {}
+            }
+        }
+    }
+}
 
 enum GameMode {
     Menu,
@@ -31,6 +74,8 @@ impl GameState for State {
 }
 
 fn main() -> BError {
-    let context = BTermBuilder::simple80x50().with_title("Flappy Dragon").build()?;
+    let context = BTermBuilder::simple80x50()
+        .with_title("Flappy Dragon")
+        .build()?;
     main_loop(context, State::new())
 }