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package cgeo.geocaching.maps;
import android.location.Location;
import java.util.ArrayList;
/**
* Map trail history
*/
public class PositionHistory {
/**
* minimum distance between two recorded points of the trail
*/
private static final double MINIMUM_DISTANCE_METERS = 10.0;
/**
* maximum number of positions to remember
*/
private static final int MAX_POSITIONS = 700;
private ArrayList<Location> history = new ArrayList<>();
/**
* Adds the current position to the trail history to be able to show the trail on the map.
*/
void rememberTrailPosition(Location coordinates) {
if (coordinates.getAccuracy() >= 50f) {
return;
}
if (coordinates.getLatitude() == 0.0 && coordinates.getLongitude() == 0.0) {
return;
}
if (history.isEmpty()) {
history.add(coordinates);
return;
}
Location historyRecent = history.get(history.size() - 1);
if (historyRecent.distanceTo(coordinates) <= MINIMUM_DISTANCE_METERS) {
return;
}
history.add(coordinates);
// avoid running out of memory
final int itemsToRemove = getHistory().size() - MAX_POSITIONS;
if (itemsToRemove > 0) {
for (int i = 0; i < itemsToRemove; i++) {
getHistory().remove(0);
}
}
}
public ArrayList<Location> getHistory() {
return history;
}
public void setHistory(ArrayList<Location> history) {
this.history = history;
}
}
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