From 5afc3fc29ae7eabbb923e1b940049c0cb950f917 Mon Sep 17 00:00:00 2001
From: Evan Hemsley <evan@moonside.games>
Date: Mon, 27 Jul 2020 12:47:54 -0700
Subject: [PATCH] update position engine

---
 content/pong/ball/bouncing/motion_engine.md | 24 +++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/content/pong/ball/bouncing/motion_engine.md b/content/pong/ball/bouncing/motion_engine.md
index 579c253..5b115f6 100644
--- a/content/pong/ball/bouncing/motion_engine.md
+++ b/content/pong/ball/bouncing/motion_engine.md
@@ -195,6 +195,30 @@ namespace PongFE.Messages
 
 This is pretty straightforward. We'll use this message to set an entity's position.
 
+In **PongFE/Engines/UpdatePositionEngine.cs**:
+
+```cs
+using Encompass;
+using PongFE.Components;
+using PongFE.Messages;
+
+namespace PongFE.Engines
+{
+    [Receives(typeof(UpdatePositionMessage))]
+    [Writes(typeof(PositionComponent))]
+    public class UpdatePositionEngine : Engine
+    {
+        public override void Update(double dt)
+        {
+            foreach (ref readonly var message in ReadMessages<UpdatePositionMessage>())
+            {
+                SetComponent(message.Entity, new PositionComponent(message.Position));
+            }
+        }
+    }
+}
+```
+
 Now we can send these messages in **MotionEngine**.
 
 ```cs