sprite sheet

src/animation.rs

@@ -0,0 +1,60 @@
+use bevy::prelude::*;
+// Source : https://bevy.org/examples/2d-rendering/sprite-sheet/
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins.set(ImagePlugin::default_nearest())) // prevents blurry sprites
+        .add_systems(Startup, setup)
+        .add_systems(Update, animate_sprite)
+        .run();
+}
+
+#[derive(Component)]
+pub struct AnimationIndices {
+    pub first: usize,
+    pub last: usize,
+}
+
+#[derive(Component, Deref, DerefMut)]
+pub struct AnimationTimer(pub Timer);
+
+pub fn animate_sprite(time: Res<Time>, mut query: Query<(&AnimationIndices, &mut AnimationTimer, &mut Sprite)>) {
+    for (indices, mut timer, mut sprite) in &mut query {
+        timer.tick(time.delta());
+
+        if timer.just_finished()
+            && let Some(atlas) = &mut sprite.texture_atlas
+        {
+            atlas.index = if atlas.index >= indices.last || atlas.index < indices.first {
+                indices.first
+            } else {
+                atlas.index + 1
+            };
+        }
+    }
+}
+
+#[allow(dead_code)]
+fn setup(
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    mut texture_atlas_layouts: ResMut<Assets<TextureAtlasLayout>>,
+) {
+    let texture = asset_server.load("textures/rpg/chars/gabe/gabe-idle-run.png");
+    let layout = TextureAtlasLayout::from_grid(UVec2::splat(24), 7, 1, None, None);
+    let texture_atlas_layout = texture_atlas_layouts.add(layout);
+    // Use only the subset of sprites in the sheet that make up the run animation
+    let animation_indices = AnimationIndices { first: 1, last: 6 };
+
+    commands.spawn(Camera2d);
+
+    commands.spawn((
+        Sprite::from_atlas_image(
+            texture,
+            TextureAtlas { layout: texture_atlas_layout, index: animation_indices.first },
+        ),
+        Transform::from_scale(Vec3::splat(6.0)),
+        animation_indices,
+        AnimationTimer(Timer::from_seconds(0.1, TimerMode::Repeating)),
+    ));
+}

src/box_collider.rs

@@ -1,7 +0,0 @@
-use bevy::{prelude::*, render::renderer};
-
-#[derive(Component, Default)]
-#[require(Transform)]
-pub struct BoxCollider {
-    pub dimensions: Vec2,
-}

src/bubble.rs

@@ -1,20 +1,19 @@
 use crate::density_grid::DensityObject;
 use crate::kirby::Kirby;
 use crate::physics_body::PhysicsBody;
-use crate::sphere_collider::SphereCollider;
 use bevy::prelude::*;
 use rand::Rng;
 use std::f32::consts::TAU;
 use std::fmt::Debug;
 
 #[derive(Component)]
-#[require(Sprite, PhysicsBody, SphereCollider, DensityObject)]
-pub struct Lana {
+#[require(Sprite, PhysicsBody, DensityObject)]
+pub struct Bubble {
     move_force: f32,
 }
 
-pub fn lana_spawn(mut commands: Commands, asset_server: Res<AssetServer>) {
-    let texture: Handle<Image> = asset_server.load("sprites/lana.png");
+pub fn bubble_spawn(mut commands: Commands, asset_server: Res<AssetServer>) {
+    let texture: Handle<Image> = asset_server.load("sprites/bubble.png");
     let mut rng = rand::rng();
 
     for _ in 0..1000 {
@@ -22,16 +21,16 @@ pub fn lana_spawn(mut commands: Commands, asset_server: Res<AssetServer>) {
         let pos = Vec2::from_angle(angle) * 500.0;
 
         commands.spawn((
-            Lana { move_force: 3000.0 },
+            Bubble { move_force: 3000.0 },
             Sprite { image: texture.clone(), ..default() },
-            Transform::from_translation(pos.extend(0.0)).with_scale(Vec3::splat(0.01)),
+            Transform::from_translation(pos.extend(0.0)).with_scale(Vec3::splat(1.0)),
             PhysicsBody { mass: 10.0, force: Vec2::ZERO, velocity: Vec2::ZERO, drag: 0.05 },
         ));
     }
 }
 
-pub fn lana_move(
-    mut lana_query: Query<(&mut PhysicsBody, &Transform, &Lana), With<Lana>>,
+pub fn bubble_move(
+    mut lana_query: Query<(&mut PhysicsBody, &Transform, &Bubble), With<Bubble>>,
     kirby_query: Query<(&Transform, &Kirby), With<Kirby>>,
 ) {
     for (mut lana_body, lana_transform, lana) in &mut lana_query {
@@ -50,9 +49,3 @@ pub fn lana_move(
         lana_body.force += dir * lana.move_force;
     }
 }
-
-#[derive(Component)]
-#[require(Sprite, Transform)]
-pub struct KirbySuction {
-    box_size: Vec2,
-}

src/kirby.rs

@@ -1,3 +1,4 @@
+use crate::animation::{AnimationIndices, AnimationTimer};
 use crate::physics_body::PhysicsBody;
 use crate::sphere_collider::SphereCollider;
 use bevy::prelude::*;
@@ -8,15 +9,32 @@ pub struct Kirby {
     speed_force: f32,
 }
 
-pub fn kirby_spawn(mut commands: Commands, asset_server: Res<AssetServer>) {
-    let sprite = Sprite::from_image(asset_server.load("sprites/kirby.png"));
+pub fn kirby_spawn(
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    mut texture_atlas_layouts: ResMut<Assets<TextureAtlasLayout>>,
+) {
+    let texture: Handle<Image> = asset_server.load("sprites/Sprite_kirby-Sheet.png");
     let body = PhysicsBody { mass: 10.0, force: Vec2::ZERO, velocity: Vec2::ZERO, drag: 0.05 };
-    let transform = Transform::from_xyz(0.0, 0.0, 0.0).with_scale(Vec3::ONE * 0.25);
-    commands.spawn((Kirby { speed_force: 10000.0 }, transform, sprite, body));
+    let layout = TextureAtlasLayout::from_grid(UVec2::splat(32), 3, 3, None, None);
+    let texture_atlas_layout = texture_atlas_layouts.add(layout);
+    let animation_indices = AnimationIndices { first: 3, last: 5 }; // idle
+
+    commands.spawn((
+        Kirby { speed_force: 10000.0 },
+        Sprite::from_atlas_image(
+            texture,
+            TextureAtlas { layout: texture_atlas_layout, index: animation_indices.first },
+        ),
+        Transform::from_scale(Vec3::splat(3.0)),
+        animation_indices,
+        AnimationTimer(Timer::from_seconds(0.1, TimerMode::Repeating)),
+        body,
+    ));
 }
 
 pub fn get_dir(keys: Res<ButtonInput<KeyCode>>) -> Vec2 {
-    if keys.pressed(KeyCode::Space) {
+    if keys.just_pressed(KeyCode::Space) {
         println!("SUCKING");
     }
 
@@ -38,13 +56,23 @@ pub fn get_dir(keys: Res<ButtonInput<KeyCode>>) -> Vec2 {
     dir.normalize_or_zero()
 }
 
-pub fn kirby_player_move(keys: Res<ButtonInput<KeyCode>>, mut query: Query<(&mut PhysicsBody, &Kirby), With<Kirby>>) {
+pub fn kirby_player_move(
+    keys: Res<ButtonInput<KeyCode>>,
+    mut query: Query<(&mut PhysicsBody, &Kirby, &mut AnimationIndices), With<Kirby>>,
+) {
     if keys.pressed(KeyCode::Space) {
         println!("SUCKING");
     }
     let dir = get_dir(keys);
-    for (mut body, kirby) in &mut query {
+    for (mut body, kirby, mut anim_indices) in &mut query {
         body.force += dir * kirby.speed_force;
+        if (dir == Vec2::ZERO) {
+            anim_indices.first = 3;
+            anim_indices.last = 5;
+        } else {
+            anim_indices.first = 6;
+            anim_indices.last = 8;
+        }
     }
 }
 

src/main.rs

@@ -1,4 +1,7 @@
+use animation::animate_sprite;
 use bevy::prelude::*;
+use bubble::bubble_move;
+use bubble::bubble_spawn;
 use camera::spawn_camera;
 use density_grid::DensityGrid;
 use density_grid::density_grid_force;
@@ -6,32 +9,32 @@ use density_grid::density_grid_update;
 use density_grid::init_density_object;
 use kirby::kirby_player_move;
 use kirby::kirby_spawn;
-use lana::lana_move;
-use lana::lana_spawn;
 use map::MapBounds;
 use physics_body::integrate;
 
+mod animation;
+mod bubble;
 mod camera;
 mod density_grid;
 mod globals;
 mod kirby;
-mod lana;
 mod map;
 mod physics_body;
 mod sphere_collider;
 
 fn main() {
     App::new()
-        .add_plugins(DefaultPlugins)
+        .add_plugins(DefaultPlugins.set(ImagePlugin::default_nearest()))
         .insert_resource(MapBounds { min: Vec2::ONE * -600.0, max: Vec2::ONE * 600.0 })
         .insert_resource(DensityGrid::new())
         .add_systems(Startup, spawn_camera)
         .add_systems(Startup, kirby_spawn)
-        .add_systems(Startup, lana_spawn)
+        .add_systems(Startup, bubble_spawn)
         .add_systems(PostStartup, init_density_object)
+        .add_systems(Update, animate_sprite)
         .add_systems(FixedUpdate, (density_grid_update, density_grid_force).chain())
         .add_systems(FixedUpdate, kirby_player_move)
-        .add_systems(FixedUpdate, lana_move)
+        .add_systems(FixedUpdate, bubble_move)
         .add_systems(FixedPostUpdate, integrate)
         .run();
 }