I haven't done anything like this, but my first impression would be to make a streaking image and fade that over time as your hand moved. There is also a motion streak example in the project that comes with cocos2d.

Hi,

I do apologize if this is blatantly obvious but I'm a newbie (great library by the way - just discovered it!!). Essentially I am trying to do this:

I have a clock view with a hyper seconds hand that needs to rotate round the clock in under 2 seconds (using ease in). Rotation seems extremely easy to achieve. However I have a transparent layer behind the hand that essentially draws a 'trail' (i.e. a faint narrow arc) as the hand rotates round the clock (essentially following the hand and easing in with the animation).

I've read the FAQs that one can schedule a timer and draw the layers at a frame rate equal to that of the actual app. However I don't know how to draw the arc on a layer and make it seem 'animatable' or at least make it look like it's drawing the arc at the same animation rate as that of the rotating hand.

Any tips, hints would be extremely appreciated. I tried this in Core Animation and it was just dead slow on the device. Drawing the arc (effectively a one pixel line forming the arc which spans across 360 degrees) was taking too long and NSTimers weren't fast enough.

Please please help :)