 	func t_doubleTapReceived(gestureRecognizer:UITapGestureRecognizer) {
 		if self.zoomsInOnDoubleTap{
 			
-			let newZoom = CGFloat(
-				min(
-					powf( 2, Float( log2(self.scrollView.zoomScale) + 1.0 ) ),
-					Float( self.scrollView.maximumZoomScale )
-					)
-			) // zoom in one level of detail
+			let newZoom = self.scrollView.jc_zoomScaleByZoomingIn(1.0)
 			
-			self.muteAnnotationUpdates = true
-			
-			let popTime = dispatch_time(
-				DISPATCH_TIME_NOW, kJCTiledScrollViewAnimationTime);
-			dispatch_after(popTime, dispatch_get_main_queue(), {
-				self.muteAnnotationUpdates = false
-			})
+			self.makeMuteAnnotationUpdatesTrueFor(kJCTiledScrollViewAnimationTime)
 			
 			if self.zoomsToTouchLocation {
 				let bounds = scrollView.bounds

		self.tiledScrollViewDelegate.tiledScrollView?(self, didReceiveTwoFingerTap: gestureRecognizer)
	}
	
}

	func t_twoFingerTapReceived(gestureRecognizer:UITapGestureRecognizer) {
		if self.zoomsOutOnTwoFingerTap{
			
			let newZoom = self.scrollView.jc_zoomScaleByZoomingOut(1.0)
			
			self.makeMuteAnnotationUpdatesTrueFor(kJCTiledScrollViewAnimationTime)
			
			scrollView.setZoomScale(newZoom, animated: true)
		}
