support cutscene camera

src/cutscene.rs

@@ -0,0 +1,60 @@
+use crate::{DebugVisuals, tb_entities::CutsceneCamera};
+use bevy::prelude::*;
+
+#[derive(Event, Debug)]
+pub struct StartCutscene(pub String);
+
+#[derive(Resource, Debug, Default)]
+enum CutsceneState {
+    #[default]
+    None,
+    Playing {
+        timer: Timer,
+    },
+}
+
+pub fn plugin(app: &mut App) {
+    app.init_resource::<CutsceneState>();
+    app.add_systems(Update, update);
+    app.add_observer(on_start_cutscene);
+}
+
+fn on_start_cutscene(
+    trigger: Trigger<StartCutscene>,
+    cutscenes: Query<(&Transform, &CutsceneCamera), Without<Camera>>,
+    mut res: ResMut<DebugVisuals>,
+    mut cutscene_state: ResMut<CutsceneState>,
+    mut cam: Query<&mut Transform, With<Camera>>,
+) {
+    let cutscene = trigger.event().0.clone();
+
+    let Some((t, _)) = cutscenes
+        .iter()
+        .find(|(_, cutscene_camera)| cutscene == cutscene_camera.name)
+    else {
+        return;
+    };
+
+    res.cam_follow = false;
+
+    *cam.single_mut() = *t;
+
+    *cutscene_state = CutsceneState::Playing {
+        timer: Timer::from_seconds(2.0, TimerMode::Once),
+    };
+}
+
+fn update(
+    mut res: ResMut<DebugVisuals>,
+    mut cutscene_state: ResMut<CutsceneState>,
+    time: Res<Time>,
+) {
+    if let CutsceneState::Playing { timer, .. } = &mut *cutscene_state {
+        timer.tick(time.delta());
+
+        if timer.finished() {
+            res.cam_follow = true;
+            *cutscene_state = CutsceneState::None;
+        }
+    }
+}

src/gates.rs

@@ -1,4 +1,4 @@
-use crate::{keys::KeyCollected, movables::TriggerMovableEvent};
+use crate::{cutscene::StartCutscene, keys::KeyCollected, movables::TriggerMovableEvent};
 use bevy::{prelude::*, utils::hashbrown::HashSet};
 
 #[derive(Resource)]
@@ -20,6 +20,7 @@ fn on_key(
 ) {
     if matches!(*state, GatesState::Init) {
         *state = GatesState::GateOpen1;
+        commands.trigger(StartCutscene("fence_01".to_string()));
 
         //TODO: put into a sound effects system
         commands.spawn((

src/main.rs

@@ -3,6 +3,7 @@ mod alien;
 mod billboards;
 mod camera;
 mod cash;
+mod cutscene;
 mod gates;
 mod heads_ui;
 mod keys;
@@ -86,6 +87,7 @@ fn main() {
     app.add_plugins(npc::plugin);
     app.add_plugins(keys::plugin);
     app.add_plugins(squish_animation::plugin);
+    app.add_plugins(cutscene::plugin);
 
     app.insert_resource(AmbientLight {
         color: Color::WHITE,

src/tb_entities.rs

@@ -78,6 +78,13 @@ pub struct MoveTarget {
     pub targetname: String,
 }
 
+#[derive(PointClass, Component, Reflect, Default)]
+#[reflect(Component)]
+#[require(Transform)]
+pub struct CutsceneCamera {
+    pub name: String,
+}
+
 #[derive(PointClass, Component, Reflect, Default)]
 #[reflect(Component)]
 #[require(Transform)]