"do nothing" is done. we have rewind alive/dead/rewind states implemented

examples/images.rs

@@ -26,7 +26,6 @@ fn init_image(
         }));
         let mesh = Mesh2d(meshes.add(Rectangle::from_size(Vec2::splat(10.0))));
 
-
         // opaque
         // Each sprite should be square with the transparent parts being completely black
         // The blue sprite should be on top with the white and green one behind it
@@ -50,6 +49,4 @@ fn init_image(
 
         commands.spawn((name, mesh, material, t));
     }
-
 }
-

src/bin/flappy/main.rs

@@ -1,16 +1,56 @@
+use bevy::{input::common_conditions::input_just_released, render::view::VisibleEntities};
 use games::*;
 
 fn main() {
     App::new()
-        .add_plugins(BaseGamePlugin { name: "flappy bird (with rewind)".into() })
+        .add_plugins(BaseGamePlugin {
-        .add_systems(Startup, init_bird)
+            name: "flappy bird (with rewind)".into(),
-        .add_systems(Update, flap)
+        })
+        .init_state::<PlayerState>()
+        .add_systems(Startup, (init_bird, init_ui))
+        .add_systems(OnEnter(PlayerState::Dead), kill_bird)
+        .add_systems(OnEnter(PlayerState::Alive), alive_bird)
+        .add_systems(
+            Update,
+            (
+                // Systems to run when player state changes
+                (
+                    // Print out when this state changes for debugging purposes
+                    debug_state_changes::<PlayerState>,
+                    // Toggle (UI) elements when the player dies/alives
+                    toggle_state_visibility::<PlayerState>,
+                ).run_if(state_changed::<PlayerState>),
+                // Detect if the bird is "dead" by checking if it is visible
+                // from the point of view of the camera
+                detect_dead.run_if(in_state(PlayerState::Alive)),
+                // Toggle rewinding state when "R" is pressed/released
+                toggle_rewind.run_if(
+                    input_just_pressed(KeyCode::KeyR).or(input_just_released(KeyCode::KeyR)),
+                ),
+                // Systems to run in the "play" state
+                (
+                    // Only flap when we press the space key
+                    flap.run_if(input_just_pressed(KeyCode::Space)),
+                )
+                    .run_if(in_state(PlayerState::Alive)),
+                // Rewinding systems
+                rewind.run_if(in_state(PlayerState::Rewind)),
+            ),
+        )
         .run();
 }
 
 #[derive(Component)]
 struct Bird;
 
+#[derive(States, Clone, Eq, PartialEq, Debug, Hash, Default, Component)]
+enum PlayerState {
+    #[default]
+    Alive,
+    Rewind,
+    Dead,
+}
+
 fn init_bird(
     mut commands: Commands,
     server: Res<AssetServer>,
@@ -30,28 +70,128 @@ fn init_bird(
 
     let t = Transform::from_xyz(0.0, 0.0, -10.0).with_rotation(Quat::from_rotation_x(PI / 2.0));
 
-        let mass = (
+    let mass = (RigidBody::Dynamic, Collider::capsule(1.0, 1.0), Mass(1.0));
-            RigidBody::Dynamic,
-            Collider::capsule(1.0, 1.0),
-            Mass(1.0),
-        );
 
     let force = ExternalForce::default().with_persistence(false);
 
     commands.spawn((name, mesh, material, mass, t, Bird, force));
 }
 
+fn init_ui(
+    mut commands: Commands,
+) {
+    commands.spawn((
+        Node {
+            align_self: AlignSelf::Center,
+            justify_self: JustifySelf::Center,
+            flex_direction: FlexDirection::Column,
+            ..default()
+        },
+        PlayerState::Dead,
+        children![
+            Text::new("You Died"),
+            Text::new("Press R to Rewind"),
+        ],
+    ));
+}
+
 // TODO: Create floor (and ceiling?)
 // Q: Move bird + camera or move world around bird & camera?
 // TODO: Obstacles
 
 fn flap(
-    keyboard: Res<ButtonInput<KeyCode>>,
+    #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
+    #[cfg(debug_assertions)] keycode: Res<ButtonInput<KeyCode>>,
     mut bird: Query<(&Transform, &mut ExternalForce), With<Bird>>,
 ) {
-    if keyboard.just_pressed(KeyCode::Space) {
+    debug_assert!(
+        matches!(state.get(), PlayerState::Alive),
+        "Only flap when playing"
+    );
+    debug_assert!(
+        keycode.just_pressed(KeyCode::Space),
+        "Only flap when space is just pressed"
+    );
+
     bird.iter_mut().for_each(|(t, mut f)| {
         f.apply_force(t.rotation * Vec3::NEG_Z * 1000.0);
     });
 }
+
+fn toggle_rewind(keycode: Res<ButtonInput<KeyCode>>, mut next: ResMut<NextState<PlayerState>>) {
+    debug_assert!(
+        keycode.just_pressed(KeyCode::KeyR) || keycode.just_released(KeyCode::KeyR),
+        "Only toggle rewind when R is pressed"
+    );
+
+    if keycode.pressed(KeyCode::KeyR) {
+        info!("Toggling rewind ON");
+        next.set(PlayerState::Rewind)
+    } else {
+        info!("Toggling rewind OFF");
+        next.set(PlayerState::Alive)
+    }
+}
+
+fn rewind(
+    #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
+    birds: Query<&Transform, With<Bird>>,
+) {
+    debug_assert!(
+        matches!(state.get(), PlayerState::Rewind),
+        "Only rewind in the rewinding state"
+    );
+
+    birds.iter().for_each(|bird| {
+        info!("Position: {:?}", *bird);
+    });
+}
+
+// PERF: Runs more than it needs, should only execute when bird enters/exit frame
+fn detect_dead(
+    #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
+    bird: Single<Entity, With<Bird>>,
+    visible: Query<&VisibleEntities, With<Camera>>,
+    mut next: ResMut<NextState<PlayerState>>,
+) {
+    debug_assert!(
+        matches!(state.get(), PlayerState::Alive),
+        "Only check if dead while alive"
+    );
+    visible.iter().for_each(|ve| {
+        if ve.entities.iter().len() > 0 {
+            let bird_visible = ve
+                .entities
+                .iter()
+                .any(|(_type_id, list)| list.contains(&(*bird)));
+
+            if bird_visible {
+                info!("Bird is visible, making alive");
+                next.set(PlayerState::Alive);
+            } else {
+                info!("Bird is not visible, making dead");
+                next.set(PlayerState::Dead);
+            }
+        }
+    });
+}
+
+fn alive_bird(
+    #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
+    bird: Single<Entity, With<Bird>>,
+    mut commands: Commands,
+) {
+    debug_assert!(!matches!(state.get(), PlayerState::Dead));
+    debug!("Aliving bird");
+    commands.entity(*bird).insert(RigidBody::Dynamic);
+}
+
+fn kill_bird(
+    #[cfg(debug_assertions)] state: Res<State<PlayerState>>,
+    bird: Single<Entity, With<Bird>>,
+    mut commands: Commands,
+) {
+    debug_assert!(matches!(state.get(), PlayerState::Dead));
+    debug!("Killing bird");
+    commands.entity(*bird).remove::<RigidBody>();
 }

src/bin/trees/debug.rs

@@ -4,15 +4,11 @@ pub(crate) struct TreesDebugPlugin;
 
 impl Plugin for TreesDebugPlugin {
     fn build(&self, app: &mut App) {
-        app.add_systems(
+        app.add_systems(Startup, init_debug_ui)
-            Startup,
+            .add_systems(
-            init_debug_ui,
-        ).add_systems(
                 Update,
                 (
-                (
+                    (spawn_debug_buttons.run_if(on_event::<AssetEvent<Monologue>>),),
-                    spawn_debug_buttons.run_if(on_event::<AssetEvent<Monologue>>),
-                ),
                     (
                         monologue_asset_tooltip
                             .run_if(on_event::<Pointer<Over>>.or(on_event::<Pointer<Out>>)),
@@ -21,9 +17,11 @@ impl Plugin for TreesDebugPlugin {
                         control_menu.run_if(on_event::<Pointer<Over>>.or(on_event::<Pointer<Out>>)),
                         delete_tree.run_if(on_event::<Pointer<Click>>),
                         drag_tree.run_if(on_event::<Pointer<Drag>>),
-                ).run_if(in_state(DebuggingState::On)),
                     )
-        ).add_observer(add_dialog_option);
+                        .run_if(in_state(DebuggingState::On)),
+                ),
+            )
+            .add_observer(add_dialog_option);
     }
 }
 
@@ -36,7 +34,6 @@ struct MonologuesList;
 #[derive(Component)]
 struct MonologuePreview;
 
-
 fn drag_tree(
     mut events: EventReader<Pointer<Drag>>,
     state: Res<State<DebuggingState>>,
@@ -47,8 +44,7 @@ fn drag_tree(
     debug_assert_eq!(*state.get(), DebuggingState::On);
 
     events.read().for_each(|event| {
-        if let Ok(mut t) = query.get_mut(event.target)
+        if let Ok(mut t) = query.get_mut(event.target) {
-        {
             let world_position = window
                 .cursor_position()
                 .and_then(|cursor| camera.0.viewport_to_world(camera.1, cursor).ok())
@@ -156,7 +152,6 @@ fn init_debug_ui(mut commands: Commands) {
         });
 }
 
-
 // When you pointer goes off of the '+' or any of it's children make the entire menu invisible
 fn control_menu(
     mut over_events: EventReader<Pointer<Over>>,
@@ -227,7 +222,6 @@ fn add_dialog_option(trigger: Trigger<OnAdd, DialogOption>, mut commands: Comman
         .observe(hover_dialog_option_out);
 }
 
-
 fn assign_monologue_event(
     trigger: Trigger<Pointer<Click>>,
     mut events: EventWriter<AssignMonologue>,
@@ -237,13 +231,11 @@ fn assign_monologue_event(
     events.write(AssignMonologue(handle.clone()));
 }
 
-
 /// Observer for the "Plant a new tree" button in the debug UI
 fn spawn_tree(_trigger: Trigger<Pointer<Click>>, mut events: EventWriter<PlantTree>) {
     events.write(PlantTree(None));
 }
 
-
 fn clear_monologue(
     mut nodes: Query<
         (Entity, &NavState),
@@ -258,7 +250,6 @@ fn clear_monologue(
     });
 }
 
-
 // When you pointer over the '+' make the entire menu visible
 fn hide_menu(mut nodes: Query<(&mut Visibility, &NavState), Changed<NavState>>) {
     nodes.iter_mut().for_each(|(mut v, n)| {
@@ -269,7 +260,11 @@ fn hide_menu(mut nodes: Query<(&mut Visibility, &NavState), Changed<NavState>>)
     });
 }
 
-fn delete_tree(mut events: EventReader<Pointer<Click>>, mut commands: Commands, query: Query<Entity, With<Tree>>) {
+fn delete_tree(
+    mut events: EventReader<Pointer<Click>>,
+    mut commands: Commands,
+    query: Query<Entity, With<Tree>>,
+) {
     events.read().for_each(|event| {
         if matches!(event.event.button, PointerButton::Middle) && query.contains(event.target) {
             debug!("Middle Click -> Despawning {}", event.target);
@@ -412,4 +407,3 @@ fn spawn_debug_buttons(
         }
     });
 }
-

src/bin/trees/main.rs

@@ -3,13 +3,13 @@
 #![allow(clippy::too_many_arguments)]
 #![feature(trim_prefix_suffix)]
 
-mod mono;
 mod debug;
+mod mono;
 
 use bevy::{picking::hover::HoverMap, platform::hash::RandomState};
+use debug::*;
 use games::*;
 use mono::*;
-use debug::*;
 use std::hash::BuildHasher;
 
 fn main() {

src/bin/trees/mono.rs

@@ -16,7 +16,6 @@ impl Monologue {
     }
 }
 
-
 #[derive(Debug, Error)]
 pub struct MonologueParseError;
 
@@ -153,16 +152,12 @@ mod tests {
         let expected = Monologue {
             batches: vec![
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["hello".into()],
-                        "hello".into()
-                    ],
                 },
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["world".into()],
-                        "world".into()
+                },
-                    ]
+            ],
-                }
-            ]
         };
 
         assert_eq!(parsed, expected);
@@ -188,16 +183,12 @@ mod tests {
         let expected = Monologue {
             batches: vec![
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["hello".into()],
-                        "hello".into()
-                    ],
                 },
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["world".into()],
-                        "world".into()
+                },
-                    ]
+            ],
-                }
-            ]
         };
 
         assert_eq!(parsed, expected);
@@ -229,28 +220,21 @@ mod tests {
         let expected = Monologue {
             batches: vec![
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["a".into(), "b".into(), "c".into()],
-                        "a".into(), "b".into(), "c".into()
-                    ]
                 },
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["d".into(), "e".into()],
-                        "d".into(), "e".into()
-                    ]
                 },
                 MonologueLineBatch {
-                    lines: vec![
+                    lines: vec!["f".into()],
-                        "f".into()
-                    ]
                 },
-            ]
+            ],
         };
 
         assert_eq!(parsed, expected);
     }
 }
 
-
 #[derive(Default)]
 struct MonologueLoader;
 

src/debug.rs

@@ -390,7 +390,12 @@ fn toggle_physics_debug_render(
 ) {
     let (_, config) = config_store.config_mut::<PhysicsGizmos>();
     *config = match state.get() {
+        // TODO: Not all, don't want to hide mesh
         DebuggingState::On => PhysicsGizmos::all(),
         DebuggingState::Off => PhysicsGizmos::none(),
     };
 }
+
+pub fn debug_state_changes<S: States + std::fmt::Debug>(s: Res<State<S>>) {
+    info!("State changed: {:?}", s);
+}

src/lib.rs

@@ -9,12 +9,12 @@ mod ui;
 mod version;
 
 // Rust stdlib
-pub use std::fmt::Display;
 pub use std::f32::consts::PI;
+pub use std::fmt::Display;
 
 // Community libraries
+pub use avian3d::prelude::*;
 pub use bevy::{
-    sprite::AlphaMode2d,
     asset::{AssetLoader, LoadContext, LoadState, LoadedFolder, io::Reader},
     color::palettes::css::*,
     gizmos::{aabb::AabbGizmoPlugin, light::LightGizmoPlugin},
@@ -29,9 +29,9 @@ pub use bevy::{
     platform::collections::HashMap,
     prelude::*,
     reflect::TypePath,
+    sprite::AlphaMode2d,
     window::WindowResized,
 };
-pub use avian3d::prelude::*;
 pub use serde::Deserialize;
 pub use thiserror::Error;