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Add BoundingBox calculation

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The BoundingBox is computed using all existing Waypoints of a Track and
returning the box through a collection of GeoPoints. The box might be
used to autofit the map of a saved Track.

See issue #60.
This commit is contained in:
Marco Bresciani 2019-08-12 10:00:02 +02:00
parent 77220dad80
commit 9902060d7b
1 changed files with 30 additions and 2 deletions
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32
app/src/main/java/org/y20k/trackbook/core/Track.java
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@ -20,6 +20,10 @@ import android.location.Location;
import android.os.Parcel;
import android.os.Parcelable;
import androidx.annotation.Nullable;
import org.osmdroid.util.BoundingBox;
import org.osmdroid.util.GeoPoint;
import org.y20k.trackbook.helpers.LocationHelper;
import org.y20k.trackbook.helpers.TrackbookKeys;
@ -28,8 +32,6 @@ import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import androidx.annotation.Nullable;
/**
* Track class
@ -53,6 +55,32 @@ public class Track implements TrackbookKeys, Parcelable {
private double mPositiveElevation;
private double mNegativeElevation;
private BoundingBox boundingBox;
/**
* Create a {@code BoundingBox} for the collection of
* {@code WayPoint}s, so that it would be possible to fit the map in
* such box and see the whole {@code Track} in the map without
* manual zooming.
*
* It computes the {@code BoundingBox} only once since it's possibly
* useless to compute it everytime.
*
* @return {@code BoundingBox} containing all {@code Waypoint}s
*/
public BoundingBox getBoundingBox() {
if (null == boundingBox) {
final ArrayList<GeoPoint> geoPoints = new ArrayList<>(mWayPoints.size());
for (final WayPoint aWayPoint : mWayPoints) {
final GeoPoint aGeoPoint = new GeoPoint(aWayPoint.getLocation());
geoPoints.add(aGeoPoint);
}
boundingBox = BoundingBox.fromGeoPoints(geoPoints);
}
return boundingBox;
}
/* Generic Constructor */
public Track(int trackFormatVersion, List<WayPoint> wayPoints, float trackLength, long duration, float stepCount, Date recordingStart, Date recordingStop, double maxAltitude, double minAltitude, double positiveElevation, double negativeElevation) {