private IEnumerable <GroupAction> Curve(int duration, double radius, double degrees, int delay = 0, double priority = 0, int[] positions = null)
{
double eps = 0.000001;
return(new List <GroupAction>
{
GroupActions.Rotate(degrees / 2, duration: duration, delay: delay, priority: priority - eps, positions: positions),
GroupActions.MoveForward(duration, stepsize: radius * PositionHelper.ToRadians(Math.Abs(degrees) / duration), delay: delay, priority: priority, positions: positions),
GroupActions.Rotate(degrees / 2, duration: duration, delay: delay, priority: priority + eps, positions: positions)
});
}
