Get the angle and make sure it's in the range 0-359, the divide it by 360 (same principle applies if you are using radians, just the range is 0 - 2*PI). This will give you a number in the range 0-0.999999. Then multiply this number by the number of frames you are using e.g. 36. This will give you a frame number from 0 to 35. You may want to work out how to round it properly so that a frame number result of <.5 goes to the lower frame and >= 0.5 goes to the higher frame. Hope this makes sense.
rotation/direction
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