feat: Add smoke explosion on demon boss spawn

Author: PraxTube

assets/spell/smoke.png

@@ -0,0 +1,7 @@
+[
+    (
+        name: "main",
+        keyframes: KeyframesRange((start: 0, end: 12)),
+        duration: 1.0,
+    ),
+]

assets/spell/smoke.trickfilm

@@ -108,6 +108,11 @@ pub struct GameAssets {
     pub demon_boss_explosion2: Handle<TextureAtlas>,
     #[asset(paths("spell/explosion2.trickfilm#main"), collection(typed))]
     pub demon_boss_explosion2_animations: Vec<Handle<AnimationClip2D>>,
+    #[asset(texture_atlas(tile_size_x = 64.0, tile_size_y = 64.0, columns = 12, rows = 1))]
+    #[asset(path = "spell/smoke.png")]
+    pub demon_boss_smoke: Handle<TextureAtlas>,
+    #[asset(paths("spell/smoke.trickfilm#main"), collection(typed))]
+    pub demon_boss_smoke_animations: Vec<Handle<AnimationClip2D>>,
 
     // --- MAP ---
     #[asset(path = "map/level.ldtk")]

src/assets.rs

@@ -3,7 +3,10 @@ use std::time::Duration;
 use bevy::prelude::*;
 use bevy_kira_audio::prelude::*;
 
-use crate::{item::statue::StatueUnlockedDelayed, GameAssets, GameState};
+use crate::{
+    item::{platform::TriggerFinalAct, statue::StatueUnlockedDelayed},
+    GameAssets, GameState,
+};
 
 use super::GameAudio;
 
@@ -38,6 +41,31 @@ fn play_bgm(
     commands.spawn(Bgm { handle });
 }
 
+fn play_boss_bgm(
+    mut commands: Commands,
+    assets: Res<GameAssets>,
+    audio: Res<Audio>,
+    game_audio: Res<GameAudio>,
+    mut ev_trigger_final_act: EventReader<TriggerFinalAct>,
+) {
+    if ev_trigger_final_act.is_empty() {
+        return;
+    }
+    ev_trigger_final_act.clear();
+
+    let volume = game_audio.main_volume * BGM_VOLUME;
+    let handle = audio
+        .play(assets.bgm_boss.clone())
+        .fade_in(AudioTween::new(
+            Duration::from_secs_f32(3.0),
+            AudioEasing::InPowi(3),
+        ))
+        .with_volume(volume)
+        .looped()
+        .handle();
+    commands.spawn(Bgm { handle });
+}
+
 fn update_bgm_volumes(
     game_audio: Res<GameAudio>,
     mut audio_instances: ResMut<Assets<AudioInstance>>,
@@ -104,6 +132,25 @@ fn unmute_bgms(
     }
 }
 
+fn despawn_normal_bgm(
+    mut commands: Commands,
+    mut audio_instances: ResMut<Assets<AudioInstance>>,
+    q_bgms: Query<(Entity, &Bgm)>,
+    mut ev_trigger_final_act: EventReader<TriggerFinalAct>,
+) {
+    if ev_trigger_final_act.is_empty() {
+        return;
+    }
+    ev_trigger_final_act.clear();
+
+    for (entity, bgm) in &q_bgms {
+        if let Some(instance) = audio_instances.get_mut(bgm.handle.clone()) {
+            instance.stop(AudioTween::default());
+        }
+        commands.entity(entity).despawn_recursive();
+    }
+}
+
 pub struct BgmPlugin;
 
 impl Plugin for BgmPlugin {
@@ -112,9 +159,11 @@ impl Plugin for BgmPlugin {
             .add_systems(
                 Update,
                 (
+                    play_boss_bgm.run_if(in_state(GameState::Gaming)),
                     update_bgm_volumes.run_if(in_state(GameState::GameOver)),
                     mute_bgms.after(update_bgm_volumes),
                     unmute_bgms,
+                    despawn_normal_bgm,
                 ),
             );
     }

src/audio/bgm.rs

@@ -16,7 +16,7 @@ use super::{
 };
 
 const SCALE: f32 = 1.5;
-const SPAWN_POS: Vec3 = Vec3::new(250.0, 0.0, 0.0);
+const SPAWN_POS: Vec3 = Vec3::new(200.0, 0.0, 0.0);
 
 #[derive(Component)]
 struct Shadow;
@@ -25,11 +25,30 @@ struct DemonCollider;
 
 #[derive(Component, Deref, DerefMut)]
 struct SpawnDelay(Timer);
+#[derive(Component)]
+struct Smoke;
+
+fn spawn_smokes(commands: &mut Commands, assets: &Res<GameAssets>, pos: Vec3) {
+    let mut animator = AnimationPlayer2D::default();
+    animator.play(assets.demon_boss_smoke_animations[0].clone());
+
+    commands.spawn((
+        Smoke,
+        animator,
+        YSort(1.0),
+        SpriteSheetBundle {
+            texture_atlas: assets.demon_boss_smoke.clone(),
+            transform: Transform::from_translation(pos).with_scale(Vec3::splat(5.0)),
+            ..default()
+        },
+    ));
+}
 
 fn spawn_demon_boss(
     mut commands: Commands,
     assets: Res<GameAssets>,
     time: Res<Time>,
+    q_smoke: Query<Entity, (With<Smoke>, Without<SpawnDelay>)>,
     mut q_delay: Query<(Entity, &mut SpawnDelay)>,
 ) {
     let (entity, mut delay) = match q_delay.get_single_mut() {
@@ -43,6 +62,13 @@ fn spawn_demon_boss(
     }
     commands.entity(entity).despawn_recursive();
 
+    let pos = PLAYER_SPAWN_POS + SPAWN_POS;
+    if q_smoke.is_empty() {
+        spawn_smokes(&mut commands, &assets, pos);
+        commands.spawn(SpawnDelay(Timer::from_seconds(0.2, TimerMode::Once)));
+        return;
+    }
+
     let mut animator = AnimationPlayer2D::default();
     animator
         .play(assets.enemy_boss_animations[0].clone())
@@ -83,8 +109,7 @@ fn spawn_demon_boss(
             YSort(36.0 * SCALE * TRANSLATION_TO_PIXEL),
             SpriteSheetBundle {
                 texture_atlas: assets.enemy_boss.clone(),
-                transform: Transform::from_translation(PLAYER_SPAWN_POS + SPAWN_POS)
-                    .with_scale(Vec3::splat(SCALE)),
+                transform: Transform::from_translation(pos).with_scale(Vec3::splat(SCALE)),
                 ..default()
             },
         ))
@@ -100,7 +125,7 @@ fn spawn_demon_boss_delay(
     }
     ev_trigger_final_act.clear();
 
-    commands.spawn(SpawnDelay(Timer::from_seconds(3.5, TimerMode::Once)));
+    commands.spawn(SpawnDelay(Timer::from_seconds(5.0, TimerMode::Once)));
 }
 
 fn despawn_demon_boss(

src/enemy/demon_boss/spawn.rs

@@ -185,8 +185,8 @@ fn trigger_final_act(
             CollisionEvent::Stopped(_, _, _) => continue,
         };
 
-        if !(&player.collider_entity == source && &item_entity == target)
-            && !(&player.collider_entity == target && &item_entity == source)
+        if !(&player.collider_entity == source && &item_entity == target
+            || &player.collider_entity == target && &item_entity == source)
         {
             continue;
         }