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}

/* Marks a point in the persistent store. Calculations are based on

* all data collected since the previous waypoint, or from the start

* of the application if no previous waypoints exist.

private void markPoint() {

long current = System.currentTimeMillis();

WayPoint p= new WayPoint(_startTime, current, _wayHorizontalDistance,

_verticalDistance);

addWayPoint(p);

// Reset the waypoint variables.

_startTime = current;

_wayHorizontalDistance = 0;

_verticalDistance = 0;

}

/**

* View the various options for this application

public void viewOptions()

{

OptionScreen optionScreen = new OptionScreen();

pushScreen(optionScreen);

}

// View the saved waypoints.

private void viewPreviousPoints() {

PointScreen pointScreen = new PointScreen(_previousPoints, _resources);

pushScreen(pointScreen);

}

/* Adds a new waypoint and commits the set of saved waypoints

* to flash memory.

* @param p The point to add.

/*package*/ synchronized static void addWayPoint(WayPoint p) {

_previousPoints.addElement(p);

commit();

}

/* Removes a waypoint from the set of saved points and commits the modifed set to flash

memory.

* @param p the point to remove

/*package*/ synchronized static void removeWayPoint(WayPoint p) {

_previousPoints.removeElement(p);

commit();

}

// Commit the waypoint set to flash memory.

private static void commit() {

_store.setContents(_previousPoints);

_store.commit();

}

/**

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