/**
* Get the distance between this point and another point in meters.
*
* @param TrackPoint $trackPoint The other point.
* @return float The distance in meters.
*/
public function distance(TrackPoint $trackPoint)
{
$earthRadius = 6371000;
$latFrom = deg2rad($this->getLatitude());
$lonFrom = deg2rad($this->getLongitude());
$latTo = deg2rad($trackPoint->getLatitude());
$lonTo = deg2rad($trackPoint->getLongitude());
$latDelta = $latTo - $latFrom;
$lonDelta = $lonTo - $lonFrom;
$angle = 2 * asin(sqrt(pow(sin($latDelta / 2), 2) + cos($latFrom) * cos($latTo) * pow(sin($lonDelta / 2), 2)));
return $angle * $earthRadius;
}
/**
* Flatten a track point to be posted on endomondo.
*
* @param TrackPoint $trackPoint The track point to flatten.
* @param float $distance The total distance the point in meters.
* @param float $speed The speed the point in km/h from the previous point.
* @return string
*/
private function flattenTrackPoint(TrackPoint $trackPoint, $distance, $speed)
{
$dateTime = clone $trackPoint->getDateTime();
$dateTime->setTimezone(new \DateTimeZone('UTC'));
return $this->formatEndomondoTrackPoint($dateTime, self::INSTRUCTION_START, $trackPoint->getLatitude(), $trackPoint->getLongitude(), $distance, $speed, $trackPoint->getElevation(), $trackPoint->hasExtension(HR::ID) ? $trackPoint->getExtension(HR::ID)->getValue() : '');
}