I am making an analog clock, and I have 3 PNGs for the arms. I am rotating
these, but they look awful with blocky edges. The second hand is a pixel
wide for instance. Is there a trick to use smoothing (aliasing) or
something?
Here is the method I call via NSTimer every second. Is there a better way to
this (I don't know OpenGL or anything like that at the moment)? CALayer?
- (void) showActivity {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |
NSDayCalendarUnit | NSHourCalendarUnit| NSMinuteCalendarUnit
|NSSecondCalendarUnit;
NSDate *date = [NSDate date];
NSDateComponents *comps = [gregorian components:unitFlags fromDate:date];
int h = [comps hour];
int m = [comps minute];
int s = [comps second];
CGAffineTransform cgaRotateHr =
CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(h * 30));
CGAffineTransform cgaRotateMin =
CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(m * 6));
CGAffineTransform cgaRotateSec =
CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(s * 6));
//Looks awful but it works (PNGs with transparency have blocked edges)
[hrHand setTransform:cgaRotateHr];
[minHand setTransform:cgaRotateMin];
[secondHand setTransform:cgaRotateSec];
NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setTimeStyle:NSDateFormatterMediumStyle];
[clockLabel setText:[formatter stringFromDate:date]];
}
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