delete the map

crates/border-wars/src/map/generation.rs

@@ -11,10 +11,13 @@ pub struct MapGenerationPlugin;
 
 impl Plugin for MapGenerationPlugin {
     fn build(&self, app: &mut App) {
-        app.add_event::<MapGenerationEvent>().add_systems(
-            Update,
-            generate_map.run_if(in_state(crate::CurrentScene::Game)),
-        );
+        app.add_event::<MapGenerationEvent>()
+            .add_event::<EndMapGenerationEvent>()
+            .add_systems(
+                Update,
+                (generate_map.after(delete_map), delete_map)
+                    .run_if(in_state(crate::CurrentScene::Game)),
+            );
     }
 }
 
@@ -68,3 +71,15 @@ fn get_type_tile(position: (f32, f32), noise: &Perlin) -> Tile {
         _ => Tile::Grass,
     }
 }
+
+fn delete_map(
+    mut commands: Commands,
+    query: Query<Entity, With<Tile>>,
+    mut event: EventReader<EndMapGenerationEvent>,
+) {
+    for _ in event.read() {
+        for entity in query.iter() {
+            commands.entity(entity).despawn_recursive();
+        }
+    }
+}