Recording average depth data

This is the calculation that is needed to display a running average in the
profile.

It adds a new member plot_data.running_sum which can be turned into the
running average by dividing by plot_data.time.

Right now this isn't used by the UI.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/profile.c b/profile.c
index 6efd05eb7..521e6f68f 100644
--- a/profile.c
+++ b/profile.c
@@ -597,6 +597,7 @@ struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *
 		entry->sec = time;
 		entry->depth = depth;
 
+		entry->running_sum = (entry - 1)->running_sum + (time - lasttime) * (depth + lastdepth) / 2;
 		entry->stopdepth = sample->stopdepth.mm;
 		entry->stoptime = sample->stoptime.seconds;
 		entry->ndl = sample->ndl.seconds;