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profile: use dynamic distances between labels on chart

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Use variable intervals for printing temperature and heart
beat labels. Obviously, so that the labels don't become
sparse on zooming, but also to make them not too crowded
on mobile / small screens.

This doesn't work for depth labels, because these labels
use data provided from the profile.c core that doesn't
know about the size of the chart.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-10-16 20:43:19 +02:00 • committed by Dirk Hohndel
parent 5c83fcd647
commit efc89b9d9c
3 changed files with 23 additions and 8 deletions
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10
profile-widget/divecartesianaxis.cpp
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@ -99,6 +99,16 @@ double DiveCartesianAxis::height() const
return labelHeight + labelSpaceVertical * dpr;
}
int DiveCartesianAxis::getMinLabelDistance(const DiveCartesianAxis &timeAxis) const
{
// For the plot not being to crowded we want at least two
// labels to fit between each pair of displayed labels.
// May need some optimization.
QLineF m = timeAxis.line();
double interval = labelWidth * 3.0 * (timeAxis.maximum() - timeAxis.minimum()) / (m.x2() - m.x1());
return int(ceil(interval));
}
static double sensibleInterval(double inc, int decimals)
{
// Use full decimal increments