From 2d2b4a8a58437998f8a0159b5f3dbd3a2db02264 Mon Sep 17 00:00:00 2001
From: Viktor Lidholt <viktorl@google.com>
Date: Mon, 12 Oct 2015 16:53:24 -0700
Subject: [PATCH] Save list of sprite physics joints

---
 packages/flutter_sprites/lib/physics_joint.dart | 2 ++
 packages/flutter_sprites/lib/physics_node.dart  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/packages/flutter_sprites/lib/physics_joint.dart b/packages/flutter_sprites/lib/physics_joint.dart
index 1a5020a65e..2c251a862e 100644
--- a/packages/flutter_sprites/lib/physics_joint.dart
+++ b/packages/flutter_sprites/lib/physics_joint.dart
@@ -25,6 +25,7 @@ abstract class PhysicsJoint {
     if (_joint == null) {
       _physicsNode = physicsNode;
       _joint = _createB2Joint(physicsNode);
+      _physicsNode._joints.add(this);
     }
   }
 
@@ -32,6 +33,7 @@ abstract class PhysicsJoint {
     if (_joint != null && _active) {
       _physicsNode.b2World.destroyJoint(_joint);
       _joint = null;
+      _physicsNode._joints.remove(this);
     }
     _active = false;
   }
diff --git a/packages/flutter_sprites/lib/physics_node.dart b/packages/flutter_sprites/lib/physics_node.dart
index fb76b21781..fbaeb9c008 100644
--- a/packages/flutter_sprites/lib/physics_node.dart
+++ b/packages/flutter_sprites/lib/physics_node.dart
@@ -31,6 +31,8 @@ class PhysicsNode extends Node {
 
   _ContactHandler _contactHandler;
 
+  List<PhysicsJoint> _joints = [];
+
   List<box2d.Body> _bodiesScheduledForDestruction = [];
 
   double b2WorldToNodeConversionFactor = 10.0;