override this.ToString () =
sprintf "{Ellipse: cx = %f, cy = %f, a = %f, b = %f, alpha = %f}" this.Cx this.Cy this.A this.B this.Alpha
override this.ToString () =
sprintf "{Ellipse: cx = %f, cy = %f, a = %f, b = %f, alpha = %f}" this.Cx this.Cy this.A this.B this.Alpha