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Different straightening algorithm, dist based instead of time based.

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Added a 30-meter distance check to prevent big editing disasters
but I'm not fully satisfied with this feature yet. I think this
is a little better than before though.
This commit is contained in:
voussoir 2023-04-12 17:29:22 -07:00
parent a181d67150
commit 2899bb992d
1 changed files with 20 additions and 7 deletions
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27
app/src/main/java/net/voussoir/trkpt/TrackFragment.kt
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@ -638,21 +638,34 @@ class TrackFragment : Fragment(), MapListener, YesNoDialog.YesNoDialogListener
fun straighten_points(a: Trkpt, b: Trkpt)
{
val al = a.toLocation()
val bl = b.toLocation()
val subtrack = Track(track.database, track.device_id)
subtrack.load_trkpts(trackbook.database.select_trkpt_start_end(
track.device_id,
start_time=min(a.time, b.time),
end_time=max(a.time, b.time),
max_accuracy=PreferencesHelper.load_max_accuracy(),
))
val lat_step = (b.latitude - a.latitude) / (b.time - a.time)
val lon_step = (b.longitude - a.longitude) / (b.time - a.time)
val ele_step = (b.altitude - a.altitude) / (b.time - a.time)
val lat_span = b.latitude - a.latitude
val lon_span = b.longitude - a.longitude
val ele_span = b.altitude - a.altitude
for (trkpt in subtrack.trkpts)
{
val index = trkpt.time - a.time
trkpt.latitude = a.latitude + (index * lat_step)
trkpt.longitude = a.longitude + (index * lon_step)
trkpt.altitude = a.altitude + (index * ele_step)
val new_location = Location("test")
val tl = trkpt.toLocation()
val dist_a = tl.distanceTo(al)
val dist_b = tl.distanceTo(bl)
val proportion = dist_a / (dist_a + dist_b)
new_location.latitude = a.latitude + (lat_span * proportion)
new_location.longitude = a.longitude + (lon_span * proportion)
if (trkpt.toLocation().distanceTo(new_location) > 30.0)
{
continue
}
trkpt.latitude = new_location.latitude
trkpt.longitude = new_location.longitude
trkpt.altitude = a.altitude + (ele_span * proportion)
trackbook.database.update_trkpt(trkpt, commit=false)
}
trackbook.database.commit()