Drawing a clipped gradient beyond the start and end points

gistfile1.swift

import Foundation
import UIKit

class MyView: UIView {
    override func drawRect(rect: CGRect) {
        // just some path
        let path = UIBezierPath(roundedRect: CGRectMake(10, 10, 200, 100), byRoundingCorners: .TopLeft | .BottomRight, cornerRadii: CGSizeMake(30, 60))
        
        // fill with red
        UIColor.redColor().setFill()
        path.fill()
        
        let ctx = UIGraphicsGetCurrentContext()
        
        // the gradiend
        let colors: NSArray = [UIColor.blueColor().CGColor, UIColor.greenColor().CGColor]
        let colorSpace = CGBitmapContextGetColorSpace(ctx)
        let locations: [CGFloat] = [0.2, 0.8]
        
        let gradient = CGGradientCreateWithColors(colorSpace, colors, locations)
        
        let options: CGGradientDrawingOptions = CGGradientDrawingOptions(kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation)
        
        UIGraphicsPushContext(ctx)
            // clip to the path
            CGContextAddPath(ctx, path.CGPath)
            CGContextClip(ctx)
        
            CGContextDrawLinearGradient(ctx, gradient, CGPointMake(50, 0), CGPointMake(100, 100), options)
            
         UIGraphicsPopContext()
        
    }
}

let view = MyView(frame: CGRectMake(0, 0, 220, 120))