From a9032603ec24b0b6190343e3972d0c620ff93041 Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Wed, 17 Aug 2022 15:29:38 -0700
Subject: [PATCH] add Filter.NthEntity

---
 src/ComponentDepot.cs | 5 +++++
 src/Filter.cs         | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/src/ComponentDepot.cs b/src/ComponentDepot.cs
index c6eca73..c9c84f1 100644
--- a/src/ComponentDepot.cs
+++ b/src/ComponentDepot.cs
@@ -185,6 +185,11 @@ namespace MoonTools.ECS
 			}
 		}
 
+		public Entity FilterNthEntity(Filter filter, int index)
+		{
+			return new Entity(filterSignatureToEntityIDs[filter.Signature][index]);
+		}
+
 		public Entity FilterRandomEntity(Filter filter)
 		{
 			var randomIndex = RandomGenerator.Next(FilterCount(filter));
diff --git a/src/Filter.cs b/src/Filter.cs
index bf7fefa..b229728 100644
--- a/src/Filter.cs
+++ b/src/Filter.cs
@@ -20,5 +20,8 @@ namespace MoonTools.ECS
 
 		public int Count => ComponentDepot.FilterCount(this);
 		public bool Empty => Count == 0;
+
+		// WARNING: this WILL crash if the index is out of range!
+		public Entity NthEntity(int index) => ComponentDepot.FilterNthEntity(this, index);
 	}
 }