From 3b55648f60d553fa3a25e2921be2bf98b7652120 Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Tue, 19 Mar 2019 10:19:23 -0500
Subject: [PATCH] feat: track position change

---
 packages/entity/traits/positioned.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/entity/traits/positioned.js b/packages/entity/traits/positioned.js
index cb6ba3f..cb6dc46 100644
--- a/packages/entity/traits/positioned.js
+++ b/packages/entity/traits/positioned.js
@@ -28,7 +28,13 @@ class PositionedBase extends Trait {
   }
 
   set position([x, y]) {
-    this.state = this.state.merge({x, y});
+    const positionChanged = x !== entity.x || y !== entity.y;
+    const lastPosition = entity.position;
+    this.entity.x = x;
+    this.entity.y = y;
+    if (positionChanged) {
+      this.entity.emit('positionChanged', entity.position, lastPosition);
+    }
   }
 
 }