Tank pressure line color

[tormento]

Dear Linus,

I always supply the tank size after importing my dive log. Until my
Extended Range course (soon, I hope), I am and I will be using a "single"
tank (twin included).

Alberto

P.S: sorry if double message. I replied directly to you and not to list.

Il giorno lun 10 set 2018 alle ore 17:07 Linus Torvalds <
torvalds at linux-foundation.org> ha scritto:

> On Mon, Sep 10, 2018 at 4:37 AM tormento <turment at gmail.com> wrote:
> >
> > I have just noticed that since a certain dive on, the tank pressure line
> color that previously had different shades of green to red according to
> pressure gradient, became plain grey.
>
> This is almost always because you haven't filled the tank size details.
>
> The pressure line is colored by SAC rate, and to get the SAC rate we
> need to know the tank size. With an unknown tank size we just make it
> gray.
>
> And yes, it's a bit silly, because the actual pressure color doesn't
> really depend on *absolute* SAC rate, but on relative one, and so it
> gets the same color regardless of what the tank size actually is. But
> since it's the same code that also calculates the actual SAC rate that
> we report textually, the code wants the actual real tank size..
>
> Another reason for a lack of SAC-rate (and a gray line) is if you have
> several gas cylinders, and subsurface can't figure out when each
> cylinder is used. At that point, subsurface simply doesn't know *when*
> you were breathing some cylinder, so it can't give that momentary
> SAC-rate.
>
>             Linus
>
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