public override void OnCollide(Entity entB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if(IsTractored && m_lastCollideTime <= 0.0f) {
                if((ActualVelocity - entB.ActualVelocity).Length() > 700.0f) {
                    if (entB is TakesDamage)
                    {
                        ((TakesDamage)entB).TakeHit(tractoredDmg);
                        asteroidHealth -= tractoredDmg;

                        m_lastCollideTime = timeBetweenCollisions;
                        Sound.PlayCue("crash", this);

                    }
                    else if (IsTractored && (ActualVelocity - entB.ActualVelocity).Length() > 700.0f)
                    {
                        asteroidHealth -= tractoredDmg;

                        m_lastCollideTime = timeBetweenCollisions;
                        Sound.PlayCue("crash", this);
                    }
                }
                if (asteroidHealth <= 0) InstaKill();
            }

            base.OnCollide(entB, contact);
        }

        bool body_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (body.BodyType == BodyType.Static) return true;

            Fixture surface;
            if (fixtureA.Body == body)
                surface = fixtureB;
            else
                surface = fixtureA;

            if (surface.Body.BodyType == BodyType.Static && surface.Shape.MassData.Area > 100)
            {
                // rotate to contact normal
                Vector2 normal = contact.Manifold.LocalNormal;

                if (Vector2.Dot(normal, body.LinearVelocity) > 0)
                {
                    return false;
                }

                isPendingAttach = true;
                pendingRotation = (float)Math.Atan2(normal.Y, normal.X);

                body.CollidesWith = Category.None;

                return false;
            }

            return true;
        }

        public override void Create(FarseerPhysics.Dynamics.World world, float Xoffset)
        {
            base.Create(world, Xoffset);

            _button = FixtureFactory.CreateRectangle(_world, Dimensions.X, Dimensions.Y, 1, Position + new Vector2(Xoffset, 0));
            _fixtures.Add(_button);
            _fixtures.Last().UserData = this;
        }

        private bool OnEnter(FarseerPhysics.Dynamics.Fixture fixtureA, FarseerPhysics.Dynamics.Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            Renderer.IsEnabled = false;
            RigidBody.Body.Enabled = false;
            Trigger.Enabled = false;
            playerScript.HasShank = true;

            return true;
        }

        public bool deadPlayerOnCollision(Fixture one, Fixture two, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (two.UserData.ToString() == "Grave" || two.Body.UserData.ToString() == "Grave")
            {
                return true;
            }

            return false;
        }

 bool Body_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
 {
     fixtureB.Body.BodyType = BodyType.Dynamic;
     if (fixtureB.Body.Mass == 101){
         Random rand = new Random();
         this.Position = new Vector2(100 + rand.Next(800), 100 + rand.Next(600));
         realPosition = Position;
     }
     return true;
 }

        // Collide with non-circloid bullets and non-circloid ships.
        public override bool ShouldCollide(Entity entB, FarseerPhysics.Dynamics.Fixture fixture, FarseerPhysics.Dynamics.Fixture entBFixture)
        {
            if (entB is CircloidShip || entB is Boss || entB is Bullet || entB is SputnikShip) return false;

            if (entB is TakesDamage && ((TakesDamage) entB).IsFriendly()) {
                return false;
            }

            return true;
        }

 /// <summary>
 /// Body_OnCollision re-enables jumping capability if on an object
 /// </summary>
 /// <param name="a_fixtureA">fixture passed in from Body A</param> 
 /// <param name="a_fixtureB">fixture passed in from Body B</param> 
 /// <param name="a_contact">Checking contact between fixtures</param> 
 private bool Body_OnCollision(Fixture a_fixtureA, Fixture a_fixtureB, FarseerPhysics.Dynamics.Contacts.Contact a_contact)
 {
     if ((string)a_fixtureB.Body.UserData == "platform")
     {
         m_body.CollisionCategories = Category.None;
         m_body.OnCollision -= Body_OnCollision;
         return true;
     }
     return false;
 }

        public override bool OnCollidedWith(Fixture f1, UserControlledCharacter character, Fixture f2, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (!character.Invulnerable)
            {
                character.TakeDamage(25, true, true);
                Dead = true;
            }

            return false;
        }

        public override bool ShouldCollide(Entity entB, FarseerPhysics.Dynamics.Fixture fixture, FarseerPhysics.Dynamics.Fixture entBFixture)
        {
            if (entB is Bullet) return false; // Don't collide with other bullets.
            if (entB == owner) return false;

            if (entB is TakesDamage) {
                if (((TakesDamage) owner).IsAllied((TakesDamage) entB)) return false;
            }

            return true;
        }

        public override bool collision(Fixture f1, Fixture f2, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            if (f2.CollisionCategories == Category.Cat3)
            {
                if (!mInvicible && mHealth > 0)
                    mHealth--;

                Console.WriteLine("Health = " + mHealth);
            }
            return true;
        }

        public override void Create(FarseerPhysics.Dynamics.World world, float Xoffset)
        {
            base.Create(world, Xoffset);

            _door = FixtureFactory.CreateRectangle(_world, Dimensions.X, Dimensions.Y, 1000000, Position + new Vector2(Xoffset, 0));
            JointFactory.CreateFixedAngleJoint(_world, _door.Body);
            _door.Body.BodyType = BodyType.Dynamic;
            _fixtures.Add(_door);
            _door.Restitution = -1.0f;
            _fixtures.Last().UserData = this;
        }

 public override bool onCollision(Fixture fix1, Fixture fix, FarseerPhysics.Dynamics.Contacts.Contact Contact)
 {
     if (target.Fixture.Contains(fix))
     {
         dispose = true;
         onHit(this, fix.UserData as Creature);
         return true;
     }
     else
         return false;
 }

        bool GroundCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            FarseerPhysics.Collision.Manifold man = new FarseerPhysics.Collision.Manifold();
            //get collision manifold
            contact.GetManifold(out man);

            if (man.LocalNormal.X == 0 && man.LocalNormal.Y == 1)
                _grounded = true;

            return true;
        }

 public override bool OnCollisionEnter(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
 {
     if (!this.triggered && !this.consumed)
     {
         if (fixtureB.Body.parent.identity.Equals(this.triggerer))
         {
              this.triggered = true;
         }
     }
     return false;
 }

        public override void Init(FarseerPhysics.Dynamics.World w, Kinect.RagdollManager r)
        {
            world = w;
            target = r.ragdoll;
            body.setWorld(w);

            body.OnCollision += new OnCollisionEventHandler(body_OnCollision);

            world.ProcessChanges();
            IsOperational = true;
        }

        public override void OnCollide(Entity entB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            m_shouldCull = !(entB is BlackHole);
            if (entB is TakesDamage) {
                ((TakesDamage) entB).TakeHit(bulletStrength);
            }

            // Disable collision response.
            contact.Enabled = false;

            base.OnCollide(entB, contact);
        }

 public override bool onCollision(Fixture fix1, Fixture fix, FarseerPhysics.Dynamics.Contacts.Contact Contact)
 {
     if (fix.CollisionCategories == Category.Cat2)
         dispose = true;
     if (fix.UserData as Creature != null && ((Creature)fix.UserData).team != this.attacker.team)
     {
         onHit(this, (Creature)fix.UserData);
         attacker.OnAttack((Creature)fix.UserData);
         dispose = true;
     }
     return false;
 }

        private bool RigidBody_OnCollision(Fixture fixtureA, Fixture fixtureB, FarseerPhysics.Dynamics.Contacts.Contact contact)
        {
            var collider = (GameModel)fixtureB.Body.UserData;

            //if (collider.Name == "Player")
            //{
            //    m_Receiver = (Player)collider;
            //    Console.WriteLine("Player hit enemy: " + EnemyName);
            //    hasHit = true;
            //}

            return true;
        }

 public override void OnCollide(Entity entB, FarseerPhysics.Dynamics.Contacts.Contact contact)
 {
     if (entB is Bullet && attachedShip == null)
     {
         //Horrible Casting makes me sad.
         foreach (SquaretopiaShip s in Environment.squares)
         {
             if(s!= this)
                 s.ai.GotShotBy(this, (GameEntity)((Bullet)entB).owner);
         }
     }
     base.OnCollide(entB, contact);
 }