feat: Player, assets and basic movement

src/player.rs

@@ -0,0 +1,41 @@
+use bevy::prelude::*;
+
+#[derive(Component)]
+pub struct Player {
+    // px/s
+    speed: f32,
+}
+
+fn player_bundle(asset_server: &Res<AssetServer>) -> impl Bundle {
+    let image = asset_server.load("sprites/player/player.png");
+    (
+        Player {
+            speed: 51.2,
+        },
+        Sprite::from_image(image),
+        Transform::from_xyz(0f32, 0f32, 1f32),
+    )
+}
+
+pub fn setup_player(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn(player_bundle(&asset_server));
+}
+
+pub fn handle_input(
+    key_input: Res<ButtonInput<KeyCode>>,
+    time: Res<Time>,
+    player: Query<(&Player, &mut Transform, &mut Sprite)>,
+) {
+    let exclusive_pressed = key_input.pressed(KeyCode::KeyA) != key_input.pressed(KeyCode::KeyD);
+    let direction = if !exclusive_pressed { 0f32 }
+        else if key_input.pressed(KeyCode::KeyA) { -1f32 }
+        else if key_input.pressed(KeyCode::KeyD) { 1f32 }
+        else { unreachable!() };
+
+    for (Player {speed}, mut transform, mut sprite) in player {
+        transform.translation.x += direction * speed * time.delta_secs();
+        if direction != 0f32 {
+            sprite.flip_x = direction < 0f32;
+        }
+    }
+}