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List:       kde-panel-devel
Subject:    Re: Unit conversion
From:       Petri =?iso-8859-15?q?Damst=E9n?= <petri.damsten () gmail ! com>
Date:       2008-09-01 13:58:55
Message-ID: 200809011658.56135.petri.damsten () gmail ! com
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On Monday 01 September 2008 16:07:08 Gerhard Gappmeier wrote:
> The idea behind the tables is,
> that it is not necessary to make own classes for each unit that
> uses a different conversion and to write the conversion code again
> and again for everything.

Simpler conversions already use QHash and conversion code is only in one place 
(SimpleUnit).

> The table works on linear conversion y=k*x+d
> and so it can do all typical conversions from temperatures, over lengths,
> to speed and so on.
> At the moment I don't see a need for a more generic conversion routine
> like logarithmic conversions, but the formula could be extended if needed.

e.g. Time zone and currency cannot be made with simple tables.

> Another important advantage is, that this way it doesn't need much
> resources, and it doesn't need string parsing if you want e.g. convert
> "mph" to "km/h". This would also be very fast if you need to convert
> thousands of values.

I didn't think that plasma applets or runners would do mass conversion so 
performance was not the first priority.

Petri


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