/**
* @param SimpleXMLElement $xml
* @return TrackSegment
* @throws InvalidGPXException
*/
public static function fromXML(SimpleXMLElement $xml)
{
$trackSegment = new TrackSegment();
if (!empty($xml->trkpt)) {
$trackPoints = [];
foreach ($xml->trkpt as $trackPoint) {
array_push($trackPoints, Waypoint::fromXML($trackPoint));
}
$trackSegment->setTrackPoints($trackPoints);
}
if (!empty($xml->extensions)) {
$trackSegment->setExtensions(Extensions::fromXML($xml->extensions[0]));
}
return $trackSegment;
}
/**
* @param SimpleXMLElement $xml
* @return Waypoint
* @throws InvalidGPXException
*/
public static function fromXML(SimpleXMLElement $xml)
{
$attributes = $xml->attributes();
if (!($latitude = $attributes['lat'])) {
throw new InvalidGPXException("No latitude specified on waypoint node.");
}
if (!($longitude = $attributes['lon'])) {
throw new InvalidGPXException("No longitude specified on waypoint node.");
}
$waypoint = new Waypoint((double) $latitude, (double) $longitude);
if (!empty($xml->ele)) {
$waypoint->setElevation((double) $xml->ele[0]);
}
if (!empty($xml->time)) {
$waypoint->setTime(strtotime((string) $xml->time[0]));
}
if (!empty($xml->magvar)) {
$waypoint->setMagvar((double) $xml->magvar[0]);
}
if (!empty($xml->geoidheight)) {
$waypoint->setGeoidheight((double) $xml->geoidheight[0]);
}
if (!empty($xml->name)) {
$waypoint->setName((string) $xml->name[0]);
}
if (!empty($xml->cmt)) {
$waypoint->setComment((string) $xml->cmt[0]);
}
if (!empty($xml->desc)) {
$waypoint->setDescription((string) $xml->desc[0]);
}
if (!empty($xml->src)) {
$waypoint->setSource((string) $xml->src[0]);
}
if (!empty($xml->link)) {
$links = [];
foreach ($xml->link as $link) {
array_push($links, Link::fromXML($link));
}
$waypoint->setLinks($links);
}
if (!empty($xml->sym)) {
$waypoint->setSymbol((string) $xml->sym[0]);
}
if (!empty($xml->type)) {
$waypoint->setType((string) $xml->type[0]);
}
if (!empty($xml->fix)) {
$waypoint->setFix((string) $xml->fix[0]);
}
if (!empty($xml->sat)) {
$waypoint->setFix((int) $xml->sat[0]);
}
if (!empty($xml->hdop)) {
$waypoint->setHdop((double) $xml->hdop[0]);
}
if (!empty($xml->vdop)) {
$waypoint->setVdop((double) $xml->vdop[0]);
}
if (!empty($xml->pdop)) {
$waypoint->setPdop((double) $xml->pdop[0]);
}
if (!empty($xml->ageofdgpsdata)) {
$waypoint->setAgeofdgpsdata((double) $xml->ageofdgpsdata[0]);
}
if (!empty($xml->dgpsid)) {
$waypoint->setDgpsid((int) $xml->dgpsid[0]);
}
if (!empty($xml->extensions)) {
$waypoint->setExtensions(Extensions::fromXML($xml->extensions[0]));
}
return $waypoint;
}
/**
* @param SimpleXMLElement $xml
* @return Route
* @throws InvalidGPXException
*/
public static function fromXML(SimpleXMLElement $xml)
{
$route = new Route();
if (!empty($xml->name)) {
$route->setName((string) $xml->name[0]);
}
if (!empty($xml->cmt)) {
$route->setComment((string) $xml->cmt[0]);
}
if (!empty($xml->desc)) {
$route->setDescription((string) $xml->desc[0]);
}
if (!empty($xml->src)) {
$route->setSource((string) $xml->src[0]);
}
if (!empty($xml->link)) {
$links = [];
foreach ($xml->link as $link) {
array_push($links, Link::fromXML($link));
}
$route->setLinks($links);
}
if (!empty($xml->number)) {
$route->setNumber((int) $xml->number[0]);
}
if (!empty($xml->type)) {
$route->setType((string) $xml->type[0]);
}
if (!empty($xml->extensions)) {
$route->setExtensions(Extensions::fromXML($xml->extensions[0]));
}
if (!empty($xml->rtept)) {
$routePoints = [];
foreach ($xml->rtept as $routePoint) {
array_push($routePoints, Waypoint::fromXML($routePoint));
}
$route->setRoutePoints($routePoints);
}
return $route;
}
/**
* @param SimpleXMLElement $xml
* @return GPX
* @throws InvalidGPXException
*/
public static function fromXML(SimpleXMLElement $xml)
{
if ($xml->getName() != 'gpx') {
throw new InvalidGPXException("Root node should be 'gpx'");
}
$attributes = $xml->attributes();
$version = $attributes['version'];
if ($version != 1.1) {
throw new InvalidGPXException("Invalid GPX version. This library only supports GPX 1.1");
}
if (!($creator = $attributes['creator'])) {
throw new InvalidGPXException("No creator specified on GPX node.");
}
$gpx = new GPX((double) $version, (string) $creator);
if (!empty($xml->metadata)) {
$gpx->setMetadata(Metadata::fromXML($xml->metadata[0]));
}
if (!empty($xml->wpt)) {
$waypoints = [];
foreach ($xml->wpt as $waypoint) {
array_push($waypoints, Waypoint::fromXML($waypoint));
}
$gpx->setWaypoints($waypoints);
}
if (!empty($xml->rte)) {
$routes = [];
foreach ($xml->rte as $route) {
array_push($routes, Route::fromXML($route));
}
$gpx->setRoutes($routes);
}
if (!empty($xml->trk)) {
$tracks = [];
foreach ($xml->trk as $track) {
array_push($tracks, Track::fromXML($track));
}
$gpx->setTracks($tracks);
}
if (!empty($xml->extensions)) {
$gpx->setExtensions(Extensions::fromXML($xml->extensions[0]));
}
return $gpx;
}
/**
* Read a single section (route or track) of a GPX file and add it to the total route
* The sections are merged into one, with a straight line between the end of one and the start of the next.
*
* @param DOMElement $route Route or track root element
*/
private function readGPXSection(DOMElement $route)
{
if ($route->tagName == "trk") {
$routePoints = $route->getElementsByTagName("trkpt");
} else {
$routePoints = $route->getElementsByTagName("rtept");
}
/* Now we start to iterate through all the waypoints.
* For each point, we want the distance from the last point (added to cumulative
* distance) and the height *increase* since the last point.
* We assume that the points are close enough together that we can treat the surface
* of the Earth as a plane and use Pythagoras' theorem to calculate distances.
* To start with, we make the start point the previous point.
*/
$numPoints = $routePoints->length;
$lastKnownHeight = null;
// Last known height - used if some nodes are missing height data
$prevPoint = null;
$iWrite = count($this->wayPoints);
for ($iRead = 0; $iRead < $numPoints; $iRead++) {
// Get the position of this waypoint
$next = $routePoints->item($iRead);
$nextPoint = new Waypoint();
$nextPoint->latLng = new LatLng($next->attributes->getNamedItem("lat")->nodeValue, $next->attributes->getNamedItem("lon")->nodeValue);
// Now see if we can get the time, speed & altitude
if ($next->hasChildNodes()) {
foreach ($next->childNodes as $childNode) {
if ($childNode->nodeType == XML_ELEMENT_NODE) {
switch ($childNode->tagName) {
case "ele":
$nextPoint->alt = (int) $childNode->nodeValue;
break;
case "time":
$nextPoint->time = $childNode->nodeValue;
break;
}
}
}
}
$this->wayPoints[$iWrite] = $nextPoint;
// If we're on anything but the first waypoint, get the previous one for some calculations
if ($iWrite >= 1) {
$prevPoint = $this->wayPoints[$iWrite - 1];
// Calculate distance & total ascent
$this->distance += $nextPoint->distanceTo($prevPoint);
if (isset($nextPoint->alt) && isset($lastKnownHeight)) {
$this->ascent += max($nextPoint->alt - $lastKnownHeight, 0);
}
}
// Store the height for future rounds - if another waypoint is missing height info
// we look back to the last time we had it
if (isset($nextPoint->alt)) {
$lastKnownHeight = $nextPoint->alt;
}
$iWrite++;
}
}
* Northing/Easting: specify as a pair of integer parameters, e.g. ?north=123456&east=123456
* Lat/long: specify as a pair of float parameters, e.g. ?lat=53.21415&lon=-1.52135
* Reverse geocoding searches are done by instansiating a waypoint and using the reverseGeocode() method.
*
* Postcode: specify as a string. Any spaces will be removed, e.g. ?postcode=S314AF
* Location name: specify as a string. String is passed directly to Nominatim, e.g. ?search=Ladybower+inn
* Scope: scope can optionally be limited to Sheffield (1), or the general area for walks (2). e.g. ?search=Ladybower+inn&scope=2 TODO: Use constants on some appropriate class
* This is only a preference, nominatim will return results outside this area if necessary.
* Searches are always limited to the UK.
* Location name search is done here for now - may be moved elsewhere when appropriate
*/
header("Content-type: application/json");
$scopeSheffield = 1;
$scopeGeneralArea = 2;
if (!empty($_GET['lat']) && !empty($_GET['lon']) || !empty($_GET['east']) && !empty($_GET['north']) || !empty($_GET['gridref'])) {
$wp = new Waypoint();
if (!empty($_GET['lat']) && !empty($_GET['lon'])) {
$wp->latLng = new LatLng((double) $_GET['lat'], (double) $_GET['lon']);
} else {
if (!empty($_GET['east']) && !empty($_GET['north'])) {
$osRef = new OSRef((int) $_GET['east'], (int) $_GET['north']);
$latLng = $osRef->toLatLng();
$latLng->OSGB36ToWGS84();
$wp->latLng = $latLng;
} else {
if (!empty($_GET['gridref'])) {
$osRef = getOSRefFromSixFigureReference($_GET['gridref']);
$latLng = $osRef->toLatLng();
$latLng->OSGB36ToWGS84();
$wp->latLng = $latLng;
}
