map overlay

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay{
    //make a new overlay
    MKPolygonView *polyView = [[MKPolygonView alloc] initWithOverlay:overlay];
    //set things
    polyView.lineWidth = 1;
    //polyView.strokeColor = [UIColor blueColor];

    //get the image and make it fit the overlay
    UIImage *image = [UIImage imageNamed:@"map.jpeg"];
    MKMapRect theMapRect = [overlay boundingMapRect];

    CGSize size = CGSizeMake(theMapRect.size.width, theMapRect.size.height);

    UIGraphicsBeginImageContext(size);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height )];
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //assign the final image as the fill color
    polyView.fillColor = [UIColor colorWithPatternImage:finalImage];
    return polyView;

}