FarseerPhysics.ScreenSystem.GameScreen.MouseDown C# (CSharp) Method

        private void MouseDown(Vector2 p)
        {
            if (_fixedMouseJoint != null)
            {
                return;
            }

            // Make a small box.
            AABB aabb;
            Vector2 d = new Vector2(0.001f, 0.001f);
            aabb.LowerBound = p - d;
            aabb.UpperBound = p + d;

            Fixture savedFixture = null;

            // Query the world for overlapping shapes.
            World.QueryAABB(
                fixture =>
                {
                    Body body = fixture.Body;
                    if (body.BodyType == BodyType.Dynamic)
                    {
                        bool inside = fixture.TestPoint(ref p);
                        if (inside)
                        {
                            savedFixture = fixture;

                            // We are done, terminate the query.
                            return false;
                        }
                    }

                    // Continue the query.
                    return true;
                }, ref aabb);

            if (savedFixture != null)
            {
                Body body = savedFixture.Body;
                _fixedMouseJoint = new FixedMouseJoint(body, p);
                _fixedMouseJoint.MaxForce = 1000.0f * body.Mass;
                World.AddJoint(_fixedMouseJoint);
                body.Awake = true;
            }
        }