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<?php
/* phpTrackme
*
* Copyright(C) 2013 Bartek Fabiszewski (www.fabiszewski.net)
*
* This is free software; you can redistribute it and/or modify it under
* the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
require_once("auth.php");
$userid = ((isset($_REQUEST["userid"]) && is_numeric($_REQUEST["userid"])) ? $_REQUEST["userid"] : 0);
$trackid = ((isset($_REQUEST["trackid"]) && is_numeric($_REQUEST["trackid"])) ? $_REQUEST["trackid"] : 0);
function haversine_distance($lat1, $lon1, $lat2, $lon2) {
$lat1 = deg2rad($lat1);
$lon1 = deg2rad($lon1);
$lat2 = deg2rad($lat2);
$lon2 = deg2rad($lon2);
$latD = $lat2 - $lat1;
$lonD = $lon2 - $lon1;
$angle = 2*asin(sqrt(pow(sin($latD/2),2)+cos($lat1)*cos($lat2)*pow(sin($lonD/2),2)));
return $angle * 6371000;
}
if ($userid) {
if ($trackid) {
// get all track data
$query = $mysqli->prepare("SELECT positions.ID,Latitude,Longitude,Altitude,Speed,Angle,DateOccurred,username,trips.Name,trips.ID FROM positions LEFT JOIN users ON (positions.FK_Users_ID=users.ID) LEFT JOIN trips ON (positions.FK_Trips_ID=trips.ID) WHERE positions.FK_Users_ID=? AND positions.FK_Trips_ID=? ORDER BY positions.DateOccurred");
$query->bind_param('ii', $userid, $trackid);
}
else {
// get data only for latest point
$query = $mysqli->prepare("SELECT positions.ID,Latitude,Longitude,Altitude,Speed,Angle,DateOccurred,username,trips.Name,trips.ID FROM positions LEFT JOIN users ON (positions.FK_Users_ID=users.ID) LEFT JOIN trips ON (positions.FK_Trips_ID=trips.ID) WHERE positions.FK_Users_ID=? ORDER BY positions.DateOccurred DESC LIMIT 1");
$query->bind_param('i', $userid);
}
$query->execute();
$query->bind_result($positionid,$latitude,$longitude,$altitude,$speed,$angle,$dateoccured,$username,$trackname,$trackid);
header("Content-type: text/xml");
$xml = new XMLWriter();
$xml->openURI("php://output");
$xml->startDocument("1.0");
$xml->setIndent(true);
$xml->startElement('root');
while ($query->fetch()) {
$xml->startElement("position");
$xml->writeAttribute("id", $positionid);
$xml->writeElement("latitude", $latitude);
$xml->writeElement("longitude", $longitude);
$xml->writeElement("altitude", ($altitude)?round($altitude):$altitude);
$xml->writeElement("speed", $speed);
$xml->writeElement("angle", $angle);
$xml->writeElement("dateoccured", $dateoccured);
$xml->writeElement("username", $username);
$xml->writeElement("trackid", $trackid);
$xml->writeElement("trackname", $trackname);
$distance = (isset($prev_latitude))?haversine_distance($prev_latitude,$prev_longitude,$latitude,$longitude):0;
$prev_latitude = $latitude;
$prev_longitude = $longitude;
$xml->writeElement("distance", round($distance));
$seconds = (isset($prev_dateoccured))?(strtotime($dateoccured)-strtotime($prev_dateoccured)):0;
$prev_dateoccured = $dateoccured;
$xml->writeElement("seconds", $seconds);
$xml->endElement();
}
$xml->endElement();
$xml->endDocument();
$xml->flush();
$query->free_result();
}
$mysqli->close();
?>
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