 import QuartzCore
 import UIKit
 
+///  C4Curve is a concrete subclass of C4Shape that has a special initialzer that creates an bezier whose shape is defined by its end points and two control points.
 public class C4Curve : C4Shape {
     
     /// The beginning and end points of the receiver. Animatable.

        }
    }
    
    
    public override var origin : C4Point {
        get {
            return C4Point(view.frame.origin)

            updatePath()
        }
    }

    /// The center of the curve's view.
    public override var center : C4Point {
        get {
            return C4Point(view.center)
