Rewrite WorldSize as a newtype around Vec2

Closes #16

Bevy provides Deref and DerefMut derives, so that's nice. I'm not sure
it makes any sense to keep the field private since those derefs expose
the Vec2 anyway. I added an `impl Default` anyway, though.

src/lib.rs

@@ -40,10 +40,7 @@ impl Plugin for AsteroidPlugin {
             RapierDebugRenderPlugin::default(),
         ))
         .insert_resource(ClearColor(BACKGROUND_COLOR))
-        .insert_resource(WorldSize {
-            width: WINDOW_SIZE.x,
-            height: WINDOW_SIZE.y,
-        })
+        .insert_resource(WorldSize::default())
         .insert_resource(Lives(3))
         .register_type::<Lives>()
         .insert_resource(Score(0))

src/machinery.rs

@@ -55,7 +55,7 @@ pub fn tick_asteroid_manager(
         let spawn_angle = rng.random_range(0.0..(std::f32::consts::PI * 2.0));
         // Rho will be the radius of a circle bordering the viewport, multiplied by 1.2
         // TODO: Use view diagonal to get a minimally sized circle around the play area
-        let spawn_distance = play_area.width.max(play_area.height) / 2.0;
+        let spawn_distance = play_area.x.max(play_area.y) / 2.0;
 
         // Convert polar to Cartesian, use as position
         let pos = Vec2::new(

src/physics.rs

@@ -56,9 +56,9 @@ pub(crate) fn wrap_entities(
     mut query: Query<&mut Transform, With<Wrapping>>,
     world_size: Res<WorldSize>,
 ) {
-    let right = world_size.width / 2.0;
+    let right = world_size.x / 2.0;
     let left = -right;
-    let top = world_size.height / 2.0;
+    let top = world_size.y / 2.0;
     let bottom = -top;
 
     for mut pos in query.iter_mut() {

src/resources.rs

@@ -10,7 +10,7 @@ use bevy::{
         Vec2,
         primitives::{Circle, Triangle2d},
     },
-    prelude::{Deref, Reflect, ReflectResource},
+    prelude::{Deref, DerefMut, Reflect, ReflectResource},
     render::mesh::Mesh,
     sprite::ColorMaterial,
 };
@@ -19,7 +19,7 @@ use bevy_inspector_egui::inspector_options::ReflectInspectorOptions;
 
 use crate::{
     ASTEROID_SMALL_COLOR, BULLET_COLOR, PLAYER_SHIP_COLOR, SHIP_THRUSTER_COLOR_ACTIVE,
-    SHIP_THRUSTER_COLOR_INACTIVE,
+    SHIP_THRUSTER_COLOR_INACTIVE, config::WINDOW_SIZE,
 };
 
 #[derive(Resource, Debug, Deref, Clone, Copy)]
@@ -41,10 +41,13 @@ impl From<Lives> for String {
     }
 }
 
-#[derive(Resource)]
-pub struct WorldSize {
-    pub width: f32,
-    pub height: f32,
+#[derive(Deref, DerefMut, Resource)]
+pub struct WorldSize(Vec2);
+
+impl Default for WorldSize {
+    fn default() -> Self {
+        WorldSize(Vec2::new(WINDOW_SIZE.x, WINDOW_SIZE.y))
+    }
 }
 
 #[derive(Resource)]