/// <summary>
/// returns where new path with specified units can move out of the way after specified path makes it
/// </summary>
/// <remarks>chooses a random location between makePathMinDist() and makePathMaxDist() away from path</remarks>
private FP.Vector makePathMovePos(long time, Path path, List<Unit> units)
{
long makePathMinDist = path.makePathMinDist (time, units);
long makePathMaxDist = path.makePathMaxDist (time, units);
FP.Vector ret;
do {
ret = new FP.Vector((long)((UnityEngine.Random.value - 0.5) * makePathMaxDist * 2),
(long)((UnityEngine.Random.value - 0.5) * makePathMaxDist * 2));
} while (ret.lengthSq() < makePathMinDist * makePathMinDist
|| ret.lengthSq() > makePathMaxDist * makePathMaxDist);
return ret + path.posWhen(time);
}