>>> The foreground code grabs the current period value
>>> maybe twice a second, inverts it to make speed, and
>>> displays the result.
>>
>> There should be middle level (I'd say Business Level) code to deal
>> with the persisted state. Its output should be meaningful values, like
>> speed, distance etc.
>>
>> And there should be UI (User Interface) level code to display the BL
>> level output.
>
> I agree that what I called "foreground code" would actually be several
> modules. =A0However, there is no point computing speed from period except=
 when
> it's needed, which is whenever you want to display a new speed value.

I agree that there is no such point for the app at this stage of the
development. But later the calculated values will be needed for other
functionality. So to make the app consistent snd to avoid unneeded
recalculations it would make sense to provide complex calcs at some
reasonable period.

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