Subsurface deco calculations
willemferguson at zoology.up.ac.za
Wed Feb 8 22:42:07 PST 2017
On 09/02/2017 06:23, Linus Torvalds wrote:
> We never renumber or delete cylinders on our own - we just ignore
> unused cylinders at the end.
> So when you download from the OSTC first, you actually have four
> cylinders defined, and the second one is the one you are using. If you
> look at the XML, you'll see all four cylinders.
> The first cylinder is an air one that you never use, but we don't
> delete it just because you didn't use it. You had it in your dive
> computer, we keep it around.
> In fact we keep the other two around too, but we have that crazy logic
> where we don't show them because they are at the end and not used. We
> should stop doing that too, but Dirk added it for some broken dive
> computers that always reported eight cylinders or something like that.
> When you download from the vyper first, the 32% cylinder ends up being
> the first one, and you still have the other three cylinders that the
> OSTC reports, but now they are all at the end so they get hidden by
> that same crazy logic.
> BTW what is the flags in the event tag?
> Not really used any more. We used to encode the cylinder number in the
> flags (because libdivecomputer didn't give it any sane way), but now
> it's just legacy noise that doesn't get renumbered. So it was the
> first cylinder for the vyper, and it is still flags=1 for that one,
> and it was the second cylinder for the OSTC, so it's flags=2 for that one.
Remember that these approaches towards non-used cylinders need to take
into account the setting in Preferences->Graph: Misc. Show unused
cylinders in equipment tab.
I will eventually have to write about this in the user manual. So if the
management unused cylinders is easy to explain, that will really help.
I will do some testing of this using some dive plans, once the patch has
been pulled into master. It appears pretty useful.
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