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New profile: try to pick better HR samples for which to print number

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This simply tries to pick at least local minima / maxima.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2014-02-25 14:24:09 -08:00
parent 21ed18816a
commit 67a1e3f3e0
1 changed files with 25 additions and 8 deletions
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31
qt-ui/profile/diveprofileitem.cpp
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@ -228,6 +228,11 @@ DiveHeartrateItem::DiveHeartrateItem()
void DiveHeartrateItem::modelDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
{
int last = -300, last_printed_hr = 0, sec = 0;
struct {
int sec;
int hr;
} hist[3] = {0};
// We don't have enougth data to calculate things, quit.
if (!shouldCalculateStuff(topLeft, bottomRight))
return;
@ -243,17 +248,29 @@ void DiveHeartrateItem::modelDataChanged(const QModelIndex &topLeft, const QMode
sec = dataModel->index(i, hDataColumn).data().toInt();
QPointF point( hAxis->posAtValue(sec), vAxis->posAtValue(hr));
poly.append(point);
/* don't print a HR
* if it's been less than 5min and less than a 20 beats change OR
* if it's been less than 2min OR if the change from the
* last print is less than 10 beats */
if (((sec < last + 300) && (abs(hr - last_printed_hr) < 20)) ||
if (hr == hist[2].hr)
// same as last one, no point in looking at printing
continue;
hist[0] = hist[1];
hist[1] = hist[2];
hist[2].sec = sec;
hist[2].hr = hr;
// don't print a HR
// if it's not a local min / max
// if it's been less than 5min and less than a 20 beats change OR
// if it's been less than 2min OR if the change from the
// last print is less than 10 beats
// to test min / max requires three points, so we now look at the
// previous one
sec = hist[1].sec;
hr = hist[1].hr;
if ((hist[0].hr < hr && hr < hist[2].hr) ||
(hist[0].hr > hr && hr > hist[2].hr) ||
((sec < last + 300) && (abs(hr - last_printed_hr) < 20)) ||
(sec < last + 120) ||
(abs(hr - last_printed_hr) < 10))
continue;
last = sec;
if (hr > 0)
createTextItem(sec, hr);
last_printed_hr = hr;
}