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This function is used to update the _input vector by an amount specified in the _deltas vector.
Both the _input and the _deltas vector should be of the same size. The keys 1 thru = and keys a thru ; are used for positive increments and the keys q thru ] and keys z thru / are used for negative increments. The number of keys used depends on the size of the _input vector. If _input is changed, the return value is equal to the number of the element of _input that was changed. A -1 is returned if _input was not changed. The maximum size of _input vector can be 23 and if the size of _input is > 23 a -3 is returned. If the size of _input and _deltas is not the same a -2 is returned. If the _quitkey is pressed this method returns a -4 |
