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profile: implement adaptive depth markings

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The old code used the maximum / minimum values of nine-minute
intervals to indicate maximum / minimum depths. This does not
work well when zooming, since the labels will get sparse.

Instead implement a primitive peak finding algorithm, that
searches for the deepest peak in the whole plot and then
repeats the procedure for the right and left sides, leaving
out a certain distance to the origninal peak. This is repeated
until there are no more peaks found.

Only peaks of a certain prominence are considered, which
conveniently gives us the valleys.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-10-18 15:30:58 +02:00 • committed by Dirk Hohndel
parent efc89b9d9c
commit 7ef0ae02a8
2 changed files with 83 additions and 22 deletions
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2
profile-widget/diveprofileitem.h
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@ -60,7 +60,7 @@ public:
DiveProfileItem(const DivePlotDataModel &model, const DiveCartesianAxis &hAxis, int hColumn, const DiveCartesianAxis &vAxis, int vColumn, double dpr);
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) override;
void replot(const dive *d, int from, int to, bool in_planner) override;
void plot_depth_sample(struct plot_data *entry, QFlags<Qt::AlignmentFlag> flags, const QColor &color);
void plot_depth_sample(const struct plot_data &entry, QFlags<Qt::AlignmentFlag> flags, const QColor &color);
int maxCeiling(int row);
private: