I felt this deserved a little more recognition so I am posting it on a public code medium. I was looking for a way to flip a NSImage vertically an horizontally. Thanks buddy @ http://itscoderslife.wordpress.com/2011/03/02/rotate-scale-flip-nsimageview/

NSImage+Rotate.mm

- (void)flipImageVertically {
  NSAffineTransform *flipper = [NSAffineTransform transform];
  NSSize dimensions = self.size;
  [self lockFocus];

  [flipper scaleXBy:1.0 yBy:-1.0];
  [flipper set];

  [self drawAtPoint:NSMakePoint(0,-dimensions.height) 
      fromRect:NSMakeRect(0,0, dimensions.width, dimensions.height) 
        operation:NSCompositeCopy fraction:1.0];

  [self unlockFocus];
}

- (void)flipImageHorizontally {
  NSAffineTransform *flipper = [NSAffineTransform transform];
  NSSize dimensions = self.size;
  [self lockFocus];

  [flipper scaleXBy:-1.0 yBy:1.0];
  [flipper set];

  [self drawAtPoint:NSMakePoint(-dimensions.height,0) 
      fromRect:NSMakeRect(0,0, dimensions.width, dimensions.height) 
        operation:NSCompositeCopy fraction:1.0];

  [self unlockFocus];
}