18. The non-transitory computer-readable storage media of claim 15 , wherein the computer-executable instructions further cause the one or more processors to determine that the distance between the input position and the position indicated by the output indicator satisfies a threshold value.
20. The non-transitory computer-readable storage media of claim 18 , wherein the computer-executable instructions further cause the one or more processors to determine that the distance between the input position and the position indicated by the output indicator satisfies the threshold value for a threshold time period.