Look around DCs dive time for automatically fixed positions.

dive = find_dive_including(gpsfix->when);

only finds dives which have a fix during the underwater time.  If the positions have
been fixed before or after the dive, fails quietly.  So let's test this situation and, in case,
pass the job to  find_dive_n_near().

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Hook up UI elements for ascent rates to planner

That provides some UI elements that were recently introduced with function
of allowing the ascent rates of the planner to be configured by the user.

I tried to make it work both with senisble as well as with imperial units.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Template for subsurface android package

For modifications to the final source code of built android package
such as permission additions and inclusion of xml and java files, it
is necessary to maintain a template. The template is copied without
any modifications on top of qt android-template before building
subsurface libraries. Refer:
http://qt-project.org/doc/qt-5/deployment-android.html#qmake-variables

Files that are required to be directly copied to android package
would be included in directory android.
Icons for subsurface on android and string.xml are included.

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>
Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add missed xml-end tag in AndroidManifest

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add ALU7 to common cylinders

Fixes #562

Signed-off-by: Joakim Bygdell <j.bygdell@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add ability to reset the settings

This may be a bit crude and it doesn't actually FULLY reset the settings
(as for example the column widths will still be maintained), but it's a
good start, I think.

Fixes #552

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Deco artefacts with low GFlow

In a dive, when you choose a very low GFlow (like 5 or 9) and a trimix
with quite some He (12/48 in the example) and descend fast, the ceiling
seems to do strange things in the first minutes of the dive (very very
deep for example or jumping around).

To understand what is going on we have to recall what gradient factors do
in detail: Plain Buehlmann gives you for each tissue a maximal inert gas
pressure that is a straight line when plotted against the ambient
pressure. So for each depth (=ambient pressure) there is a maximally
allowed over-pressure.

The idea of gradient factors is that one does not use all the possible
over-pressure that Buehlmann gives us but only a depth dependent fraction.
GFhigh is the fraction of the possible over-pressure at the surface while
GFlow is the fraction at the first deco stop. In between, the fraction is
linearly interpolated. As the Buehlmann over-pressure is increasing with
depth and typically also the allowed overpressure after applications of
gradient factors increases with depth or said differently: the tissue
saturation has to be lower if the diver wants to ascent.

The main problem is: What is the first stop (where to apply GFlow)? In a
planned dive, we could take the first deco stop, but in a real dive from a
dive computer download it is impossible to say what constitutes a stop and
what is only a slow ascent?

What I have used so far is not exactly the first stop but rather the first
theoretical stop: During all of the dive, I have calculated the ceiling
under the assumption that GFlow applies everywhere (and not just at a
single depth). The deepest of these ceilings I have used as the “first
stop depth”, the depth at which GFlow applies.

Even more, I only wanted to use the information that a diver has during
the dive, so I actually only considered the ceilings in the past (and not
in the future of a given sample).

But this brings with it the problem that early in the dive, in particular
during the descent the lowest ceiling so far is very shallow (as not much
gas has built up in the body so far).

This problem now interferes with a second one: If at the start of the dive
when the all compartments have 790mbar N2 the diver starts breathing a
He-heavy mix (like 12/48) and descents fast the He builds up in the
tissues before the N2 can diffuse out. So right at the start, we already
encounter high tissue loadings.

If now we have a large difference between GFhigh and GFlow but they apply
at very similar depth (the surface and a very shallow depth of the deepest
ceiling (which for a non-decompression dive would be theoretically at
negative depth) so far) it can happen that the linear interpolation as
opposite slope then in the typical case above: The allowed over-pressure
is degreasing with depth, shallower depth do not require lower gas loading
in the tissue (i.e. can be reached after further off-gasing) but but
tolerate higher loadings. In that situation the ceiling disappears (or is
rather a floor).

So far, I got rid of that problem, by stating that the minimum depth for
GFlow was 20m (after all, GFlow is about deep stops, so it should better
not be too shallow). Now the dive reported in ticket #549 takes values to
an extreme in such away that 20m (which is determined by
buehlmann_config.gf_low_position_min in deco.c) was not enough to prevent
this inversion problem (or in a milder form that the interpolation of
gradient factors is in fact an extrapolation with quite extreme values).

This patch that gets rid of the problem for the dive described above but
still it is possible to find (more extreme) parameter choices that lead to
non-realistic ceilings.

Let me close by pointing out that all this is only about the descent, as
it is about too shallow depth for GFlow. So no real deco (i.e. later part
of the dive) is inflicted. This is only about a theoretical ceiling
displayed possibly in the first minutes of a dive. So this is more an
aesthetically than a practical problem.

Fixes #549

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix typo in connecting ui.descRate to setDescRate

Qt didn't find the right function without the type there. This also gets
rid of the warning about that.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Connect prefs.descrate to drop_stone_mode points

This enables so we can change the decent speed for drop like a stone
mode.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Make pO2 settings functional in planner

Spin boxes for pO2 are now hooked up to preference values. Adding new
cylinders (or changing their fo2) computes the MOD accordin to the current
value of decopo2. Note that chaning the limits for deco pO2 does _not_
automatically update the switch depth of all cylinders as those might have
been manually entered.

Furthermore, MOD has now to option of rounding to multiples of a given
depth. That is used for the automatic switch depth which are now always
multiples of 3m (so that EAN50 is switched to at 21m rather than 22m).

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Make gas mod be reasonable for users of imperial units as well

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix keyboard shortcuts for user manual

Shortcuts for widgets without focus should have window context.

Signed-off-by: Sergey Starosek <sergey.starosek@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Create Dive Computer configuration dialog

Create a dialog for reading and writing settings to and
from dive computers, with a menu entry in MainWindow to
open the dialog.

I will build up on this dialog and change it as needed.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Load vendor list and product list

Using code from 'downloadfromdivecomputer' class, this code
loads the vendors and products to the respective comboboxes.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Read basic details from dive computer

Added classes for reading data from dive computer. This is
at the basic level and I will expand it as I go along.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Create class to write settings to dive computer

Adds a class to write settings to dive computer, and modifies
the existing ones to integrate it.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Change dive computer family detection

Following suggestions on the mailing list, this changes the
method used to detect the dive computer family. Detection is
now done using: dc_device_get_type.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Improve writing of date and time to dive computer

Improves writing of date and time to the dive computer. This
has been tested using the Heinrichs Weikamp OSTC-3.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Improve writing of device name to dive computers.

Improves the writing of device name to the dive computer. The
code has been updated to use a switch statement.

This will make it easier to add new devices in the future.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Add brightness setting

Adds a setting to control the device's brightness. Currently I
have only the OSTC 3. Will add more afterwards.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>