Extract systems

src/game/runtime.rs

@@ -0,0 +1,40 @@
+use avian2d::prelude::*;
+use bevy::prelude::*;
+
+use super::objects::Player;
+
+pub fn move_player(
+    time: Res<Time>,
+    keyboard_input: Res<ButtonInput<KeyCode>>,
+    mut velocity: Single<&mut LinearVelocity, With<Player>>,
+) -> Result {
+    let acceleration = 500.0;
+
+    let delta_time = time.delta_secs();
+
+    if keyboard_input.any_pressed([KeyCode::KeyW, KeyCode::ArrowUp]) {
+        velocity.y += acceleration * delta_time;
+    }
+    if keyboard_input.any_pressed([KeyCode::KeyS, KeyCode::ArrowDown]) {
+        velocity.y -= acceleration * delta_time;
+    }
+    if keyboard_input.any_pressed([KeyCode::KeyA, KeyCode::ArrowLeft]) {
+        velocity.x -= acceleration * delta_time;
+    }
+    if keyboard_input.any_pressed([KeyCode::KeyD, KeyCode::ArrowRight]) {
+        velocity.x += acceleration * delta_time;
+    }
+
+    Ok(())
+}
+
+pub fn quit(mut exit: EventWriter<AppExit>) {
+    exit.write(AppExit::Success);
+}
+
+pub fn move_camera(
+    mut camera: Single<&mut Transform, (Without<Player>, With<IsDefaultUiCamera>)>,
+    player: Single<&Transform, (With<Player>, Without<IsDefaultUiCamera>)>,
+) {
+    camera.translation = camera.translation.lerp(player.translation, 0.05);
+}