Add setup system with camera and empty map

src/main.rs

@@ -16,6 +16,6 @@ use prelude::*;
 fn main() {
     App::build()
         .add_plugins(DefaultPlugins)
-        .add_plugin(PlayerPlugin)
+        .add_startup_system(setup.system())
         .run();
 }

src/systems/mod.rs

@@ -1,5 +1,36 @@
 use crate::prelude::*;
 
+pub fn setup(
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    // Camera
+    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
+
+    // Map
+    let grass_material = materials.add(asset_server.load("grass.png").into());
+    let tile_size = Vec2::new(32.0, 32.0);
+    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;
+    let half_y = (map_size.y / 2.0) as i32;
+
+    for y in -half_y..half_y {
+        for x in -half_x..half_x {
+            let position = Vec2::new(x as f32, y as f32);
+            let translation = (position * tile_size).extend(0.0);
+
+            commands.spawn_bundle(SpriteBundle {
+                material: grass_material.clone(),
+                sprite: sprite.clone(),
+                transform: Transform::from_translation(translation),
+                ..Default::default()
+            });
+        }
+    }
+}
+
 pub fn add_player(mut commands: Commands) {
     commands
         .spawn()