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Zonciu · Apr 22, 2019 · 23d3ff6 · 23d3ff6
1 parent 8e87752
commit 23d3ff6
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Showing 2 changed files with 3 additions and 9 deletions.
diff --git a/src/Collision/Shapes/Shape.cs b/src/Collision/Shapes/Shape.cs
@@ -14,18 +14,11 @@ public abstract class Shape
         /// making rounded polygons.
         public float Radius;
 
-        public ShapeType ShapeType;
+        public ShapeType ShapeType { get; internal set; }
 
         /// Clone the concrete shape using the provided allocator.
         public abstract Shape Clone();
 
-        /// Get the type of this shape. You can use this to down cast to the concrete shape.
-        /// @return the shape type.
-        public ShapeType GetShapeType()
-        {
-            return ShapeType;
-        }
-
         /// Get the number of child primitives.
         public abstract int GetChildCount();
 

diff --git a/src/Dynamics/ContactManager.cs b/src/Dynamics/ContactManager.cs
@@ -98,7 +98,8 @@ private Contact CreateContact(
             Debug.Assert(0 <= type1 && type1 < ShapeType.TypeCount);
             Debug.Assert(0 <= type2 && type2 < ShapeType.TypeCount);
 
-            var reg = _registers[(int) type1, (int) type2];
+            var reg = _registers[(int) type1, (int) type2]
+                   ?? throw new NullReferenceException($"{type1.ToString()} can not contact to {type2.ToString()}");
             if (reg.Primary)
             {
                 return reg.Factory.Create(fixtureA, indexA, fixtureB, indexB);