Is there a way to change rotation of gesture events?

Question

I need to trigger gesture events in Mac OS X. I found this question: Is there a way to trigger gesture events on Mac OS X? It works for me, but if I want to change rotation? For example,

- (void)rotateWithEvent:(NSEvent *)event {
    NSLog(@"ROTATE: %f", [event rotation]);
}
-(IBAction)button:(id)sender {
    ...
    CGEventSourceRef eventSource = CGEventSourceCreate(kCGEventSourceStateCombinedSessionState);
    CGEventRef event = CGEventCreate(eventSource);
    CGEventSetType(event, NSEventTypeRotate);
    CGEventPost(kCGHIDEventTap, event);
    ...
}

will log

ROTATE: 0.0

I was searching how to change rotation, but had not found anything... Thanks for any help.