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profile: better increments for the time axis

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The usual increments (leading 1, 2, 4 or 5) don't look
natural for the time axis. Therefore special case the
time axis and to increments in 1, 2, 3, 4, 5, 6 or 12
parts of a minute or second.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-11-12 21:37:33 +01:00 committed by Dirk Hohndel
parent 210660d057
commit 6b33c3e721
1 changed files with 18 additions and 3 deletions
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21
profile-widget/divecartesianaxis.cpp
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@ -106,8 +106,23 @@ int DiveCartesianAxis::getMinLabelDistance(const DiveCartesianAxis &timeAxis) co
return int(ceil(interval));
}
static double sensibleInterval(double inc, int decimals)
static double sensibleInterval(double inc, int decimals, bool is_time_axis)
{
if (is_time_axis && inc < 60.0) {
// for time axes and less than one hour increments, round to
// 1, 2, 3, 4, 5, 6 or 12 parts of an hour or a minute
// (that is 60, 30, 20, 15, 12, 10 or 5 min/sec).
bool fraction_of_hour = inc > 1.0;
if (fraction_of_hour)
inc /= 60.0;
inc = inc <= 1.0 / 12.0 ? 1.0 / 12.0 :
inc <= 1.0 / 6.0 ? 1.0 / 6.0 :
1.0 / floor(1.0/inc);
if (fraction_of_hour)
inc *= 60.0;
return inc;
}
// Use full decimal increments
double digits = floor(log10(inc));
int digits_int = lrint(digits);
@ -120,7 +135,7 @@ static double sensibleInterval(double inc, int decimals)
double digits_factor = pow(10.0, digits);
int inc_int = std::max((int)ceil(inc / digits_factor), 1);
// Do "nice" increments of the leading digit: 1, 2, 4, 5.
// Do "nice" increments of the leading digit. In general: 1, 2, 4, 5.
if (inc_int > 5)
inc_int = 10;
if (inc_int == 3)
@ -151,7 +166,7 @@ void DiveCartesianAxis::updateTicks(int animSpeed)
// Round the interval to a sensible size in display units
double intervalDisplay = stepValue * transform.a;
intervalDisplay = sensibleInterval(intervalDisplay, fractionalDigits);
intervalDisplay = sensibleInterval(intervalDisplay, fractionalDigits, position == Position::Bottom);
// Choose full multiples of the interval as minumum and maximum values
double minDisplay = transform.to(dataMin);