private List <Circle> circleChildrens; //các đường tròn con trong 1 đường tròn cha public Circle(int _handle) { this.handle = _handle; this.x = Lcad.PropGetFloat(handle, Lcad.LC_PROP_CIRCLE_X); this.y = Lcad.PropGetFloat(handle, Lcad.LC_PROP_CIRCLE_Y); this.radius = Lcad.PropGetFloat(handle, Lcad.LC_PROP_CIRCLE_RAD); this.circleChildrens = new List <Circle>(); this.circleParent = null; }