Make camera follow player

src/main.rs

@@ -20,5 +20,6 @@ fn main() {
         .add_startup_system(setup.system())
         .add_startup_system(add_player.system())
         .add_system(player_movement.system())
+        .add_system(follow_player.system())
         .run();
 }

src/systems/mod.rs

@@ -1,4 +1,5 @@
 use crate::prelude::*;
+use bevy::render::camera::Camera;
 
 pub fn setup(
     mut commands: Commands,
@@ -10,7 +11,7 @@ pub fn setup(
 
     // Map
     let grass_material = materials.add(asset_server.load("grass.png").into());
-    let tile_size = Vec2::new(32.0, 32.0);
+    let tile_size = Vec2::new(64.0, 64.0);
     let sprite = Sprite::new(tile_size);
     let map_size = Vec2::new(80.0, 50.0);
     let half_x = (map_size.x / 2.0) as i32;
@@ -79,6 +80,24 @@ pub fn player_movement(
     }
 }
 
+pub fn follow_player(
+    mut q: QuerySet<(
+        Query<&Transform, With<Player>>,
+        Query<&mut Transform, With<Camera>>,
+    )>,
+) {
+    if let Ok(player_transform) = q.q0().single() {
+        let player_translation = player_transform.translation;
+
+        if let Ok(mut camera_transform) = q.q1_mut().single_mut() {
+            let camera_translation = &mut camera_transform.translation;
+
+            camera_translation.x = player_translation.x;
+            camera_translation.y = player_translation.y;
+        }
+    }
+}
+
 pub fn greet_player(
     query: Query<&Name, With<Player>>,
     time: Res<Time>,