Box2DX.Dynamics.Body.SetFixedRotation C# (CSharp) Method

		public void SetFixedRotation(bool fixedr)
		{
			if (fixedr)
			{
				_angularVelocity = 0.0f;
				_invI = 0.0f;
				_flags |= BodyFlags.FixedRotation;
			}
			else
			{
				if (_I > 0.0f)
				{
					// Recover _invI from _I.
					_invI = 1.0f / _I;
					_flags &= BodyFlags.FixedRotation;
				}
				// TODO: Else what?
			}
		}

        private void InitPhysics(BattleArena arena)
        {
            // Define the dynamic body. We set its position and call the body factory.
            BodyDef bodyDef = new BodyDef();
            bodyDef.Position.Set(0.0f, 4.0f);
            body = arena.world.CreateBody(bodyDef);

            // Define another box shape for our dynamic body.
            PolygonDef shapeDef = new PolygonDef();
            shapeDef.SetAsBox(Pokemon.Width / 2, Pokemon.Height / 2);

            // Set the box density to be non-zero, so it will be dynamic.
            shapeDef.Density = 1.0f;

            // Override the default friction.
            //shapeDef.Friction = 2f;

            // Add the shape to the body.
            Fixture fix = body.CreateFixture(shapeDef);
            fix.Density = 1;
            fix.Friction = 0.3f;
            fix.Restitution = 0.1f;
            fix.UserData = this;
            fix.Filter.GroupIndex = this.ID;
            fix.Filter.CategoryBits = 0x0002;
            if (Pokemon.Types.Contains(PokemonType.Ghost)){
                fix.Filter.MaskBits = 0xFFFF - 0x0002;
            } else {
                fix.Filter.MaskBits = 0xFFFF;
            }

            // Now tell the dynamic body to compute it's mass properties base
            // on its shape.
            var mass = body.GetMassData();
            mass.Mass = Pokemon.Weight;
            body.SetMass(mass);

            body.SetFixedRotation(true);
        }