[Twisted-Python] twisted.positioning: storing the error information

Laurens Van Houtven lvh at laurensvh.be
Thu Sep 3 08:23:47 EDT 2009

Oh, I think I've just found a nice and clever way of doing it.

Let's stop pretending that altitudes are special. After all, the axes
altitude, latitude and longitude are measured on are all orthogonal.
The only difference is that we use degrees to measure one and meters
to measure the other (because the earth just isn't flat). The
"position" in time-position-velocity (TPV) is traditionally understood
to also contain altitude information.

This has the advantage of keeping the Position(ing)Error object
consistent with the way it works now, and then we only have to remove
the IPositioningReceiver.altitudeReceived callback and merge it with
IPositioningReceiver.positionReceived, and then add a bunch of objects
for describing all sorts of errors (ClimbError, HeadingError...),
rename PositioningError to PositionError and add it as a parameter on
positionReceived, and similarly add a parameter for all of the other
callbacks except for beaconInformationReceived.

Make sense to anyone else but me?

Thanks for listening

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