Merge pull request #496 from hankjordan/mapentities

Implement `MapEntities`

src/map/mod.rs

@@ -1,4 +1,6 @@
 use bevy::asset::Assets;
+use bevy::ecs::entity::{EntityMapper, MapEntities};
+use bevy::ecs::reflect::ReflectMapEntities;
 use bevy::prelude::{ReflectComponent, Res, ResMut, Resource};
 use bevy::render::render_resource::TextureUsages;
 use bevy::{
@@ -41,9 +43,15 @@ pub struct TilemapRenderSettings {
 
 /// A component which stores a reference to the tilemap entity.
 #[derive(Component, Reflect, Clone, Copy, Debug, Hash)]
-#[reflect(Component)]
+#[reflect(Component, MapEntities)]
 pub struct TilemapId(pub Entity);
 
+impl MapEntities for TilemapId {
+    fn map_entities(&mut self, entity_mapper: &mut EntityMapper) {
+        self.0 = entity_mapper.get_or_reserve(self.0);
+    }
+}
+
 impl Default for TilemapId {
     fn default() -> Self {
         Self(Entity::from_raw(0))

src/tiles/storage.rs

@@ -1,4 +1,10 @@
-use bevy::prelude::*;
+use bevy::{
+    ecs::{
+        entity::{EntityMapper, MapEntities},
+        reflect::ReflectMapEntities,
+    },
+    prelude::*,
+};
 
 use crate::map::TilemapSize;
 
@@ -7,12 +13,20 @@ use super::TilePos;
 /// Used to store tile entities for fast look up.
 /// Tile entities are stored in a grid. The grid is always filled with None.
 #[derive(Component, Reflect, Default, Debug, Clone)]
-#[reflect(Component)]
+#[reflect(Component, MapEntities)]
 pub struct TileStorage {
     tiles: Vec<Option<Entity>>,
     pub size: TilemapSize,
 }
 
+impl MapEntities for TileStorage {
+    fn map_entities(&mut self, entity_mapper: &mut EntityMapper) {
+        for entity in self.tiles.iter_mut().flatten() {
+            *entity = entity_mapper.get_or_reserve(*entity);
+        }
+    }
+}
+
 impl TileStorage {
     /// Creates a new tile storage that is empty.
     pub fn empty(size: TilemapSize) -> Self {