Smallest Turning Angle in Radians - CW rotations position, CCW rotations negative

gistfile1.swift

import Darwin

let π = CGFloat(M_PI)
let _2π = CGFloat(2.0 * π)

extension CGFloat
{
	func angleDeltaForShortestRotation(#toAngle: CGFloat) -> CGFloat
	{
		return remainder(toAngle - self + _2π, _2π)
	}
}