     
     
     func renderBitmap() {
-        layer.zPosition = 2000
         if bounds.isEmpty {
             return
         }

        var height = UInt(bounds.height)
        
        if  data == nil {
            data = [Pixel]()
        }

        var p = 0.0

        }
    }
    var image:UIImage?
    private var data:[UInt8]?
    private var currentPoint = CGPointZero
    private var handleRect = CGRectZero
    public var handleColor:UIColor = UIColor.blackColor()
