From 02ccc3d1a5810f1da07e89f2e23c158d1b24df78 Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Thu, 9 Feb 2023 10:50:25 -0800
Subject: [PATCH] add World.Relate + Spawner object

---
 src/Spawner.cs | 16 ++++++++++++++++
 src/System.cs  |  8 +-------
 src/World.cs   |  8 ++++++++
 3 files changed, 25 insertions(+), 7 deletions(-)
 create mode 100644 src/Spawner.cs

diff --git a/src/Spawner.cs b/src/Spawner.cs
new file mode 100644
index 0000000..babb1f6
--- /dev/null
+++ b/src/Spawner.cs
@@ -0,0 +1,16 @@
+namespace MoonTools.ECS
+{
+	public abstract class Spawner
+	{
+		private World World;
+
+		public Spawner(World world)
+		{
+			World = world;
+		}
+
+		protected Entity CreateEntity() => World.CreateEntity();
+		protected void Set<TComponent>(in Entity entity, in TComponent component) where TComponent : unmanaged => World.Set<TComponent>(entity, component);
+		protected void Relate<TRelationKind>(in Entity entityA, in Entity entityB, TRelationKind relationData) where TRelationKind : unmanaged => World.Relate(entityA, entityB, relationData);
+	}
+}
diff --git a/src/System.cs b/src/System.cs
index 6d1d4dd..ea59464 100644
--- a/src/System.cs
+++ b/src/System.cs
@@ -69,13 +69,7 @@ namespace MoonTools.ECS
 			MessageDepot.Add(entity.ID, message);
 		}
 
-		protected void Relate<TRelationKind>(in Entity entityA, in Entity entityB, TRelationKind relationData) where TRelationKind : unmanaged
-		{
-			RelationDepot.Set(entityA, entityB, relationData);
-			var relationTypeIndex = RelationTypeIndices.GetIndex<TRelationKind>();
-			EntityStorage.AddRelationKind(entityA.ID, relationTypeIndex);
-			EntityStorage.AddRelationKind(entityB.ID, relationTypeIndex);
-		}
+		protected void Relate<TRelationKind>(in Entity entityA, in Entity entityB, TRelationKind relationData) where TRelationKind : unmanaged => World.Relate(entityA, entityB, relationData);
 
 		protected void Unrelate<TRelationKind>(in Entity entityA, in Entity entityB) where TRelationKind : unmanaged
 		{
diff --git a/src/World.cs b/src/World.cs
index 481900e..7e3b067 100644
--- a/src/World.cs
+++ b/src/World.cs
@@ -78,6 +78,14 @@ namespace MoonTools.ECS
 			MessageDepot.Add(message);
 		}
 
+		public void Relate<TRelationKind>(in Entity entityA, in Entity entityB, TRelationKind relationData) where TRelationKind : unmanaged
+		{
+			RelationDepot.Set(entityA, entityB, relationData);
+			var relationTypeIndex = RelationTypeIndices.GetIndex<TRelationKind>();
+			EntityStorage.AddRelationKind(entityA.ID, relationTypeIndex);
+			EntityStorage.AddRelationKind(entityB.ID, relationTypeIndex);
+		}
+
 		public void Destroy(in Entity entity)
 		{
 			foreach (var componentTypeIndex in EntityStorage.ComponentTypeIndices(entity.ID))