Focus camera on player

src/main.rs

@@ -1,4 +1,4 @@
-use bevy::prelude::*;
+use bevy::{prelude::*, render::{camera::Camera, render_graph::base::camera::CAMERA_2D}};
 
 #[derive(Default, Debug)]
 struct Player {
@@ -11,8 +11,7 @@ struct Player {
 struct GameState {
     player: Player,
     score: u32,
-    camera_should_focus: Vec3,
-    camera_is_focused: Vec3,
+    camera_focus: Vec3
 }
 
 fn main() {
@@ -21,6 +20,7 @@ fn main() {
         .add_plugins(DefaultPlugins)
         .add_startup_system(setup.system())
         .add_system(movement.system())
+        .add_system(focus_camera.system())
         .run();
 }
 
@@ -117,3 +117,17 @@ fn movement(
         }
     }
 }
+
+fn focus_camera(mut game: ResMut<GameState>, mut transforms: QuerySet<(Query<(&mut Transform, &Camera)>, Query<&Transform>)>) {
+    if let Some(player_entity) = game.player.entity {
+        if let Ok(player_transform) = transforms.q1().get(player_entity) {
+            game.camera_focus = player_transform.translation;
+        }
+    }
+
+    for (mut transform, camera) in transforms.q0_mut().iter_mut() {
+        if camera.name == Some(CAMERA_2D.to_string()) {
+            *transform.translation = *game.camera_focus;
+        }
+    }
+}