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<?php |
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namespace App\Service; |
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use App\Entity\Wander; |
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use Exception; |
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use Gothick\Geotools\Polyline; |
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use Gothick\Geotools\PolylineGeoJsonFormatter; |
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use Gothick\Geotools\PolylineRdpSimplifier; |
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use phpGPX\phpGPX; |
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use Psr\Log\LoggerInterface; |
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class GpxService |
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{ |
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/** @var phpGPX */ |
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private $phpGpx; |
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/** @var string */ |
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private $gpxDirectory; |
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/** @var LoggerInterface */ |
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private $logger; |
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/** @var array */ |
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private $homebaseCoords; |
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/** @var int */ |
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private $wanderSimplifierEpsilonMetres; |
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public function __construct(string $gpxDirectory, LoggerInterface $logger, array $homebaseCoords, int $wanderSimplifierEpsilonMetres) |
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{ |
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$this->phpGpx = new phpGPX(); |
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$this->gpxDirectory = $gpxDirectory; |
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$this->logger = $logger; |
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$this->homebaseCoords = $homebaseCoords; |
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$this->wanderSimplifierEpsilonMetres = $wanderSimplifierEpsilonMetres; |
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} |
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/** |
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* @throws \Exception |
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*/ |
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public function getFullGpxFilePathFromWander(Wander $wander): string |
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{ |
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$filename = $wander->getGpxFilename(); |
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if (!$filename) { |
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throw new \Exception("No GPX file path found in wander."); |
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} |
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return $this->getFullGpxFilePathFromFilename($filename); |
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} |
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public function getFullGpxFilePathFromFilename(string $filename): string |
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{ |
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return $this->gpxDirectory . '/' . $filename; |
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} |
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public function getGpxStringFromFilename(string $filename): string |
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{ |
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$gpx = \file_get_contents($this->getFullGpxFilePathFromFilename($filename)); |
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if ($gpx === false) { |
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throw new Exception("Couldn't read GPX file from $filename"); |
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} |
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return $gpx; |
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} |
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private function updateGeneralStats(string $gpxxml, Wander $wander): void |
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{ |
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$gpx = $this->phpGpx->parse($gpxxml); |
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// TODO: Cope with multiple tracks in a file? I don't think |
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// we've done that often, if ever. |
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foreach ($gpx->tracks as $track) |
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{ |
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$stats = $track->stats; |
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// These are the only essentials |
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$wander->setStartTime($stats->startedAt); |
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$wander->setEndTime($stats->finishedAt); |
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try { |
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$wander->setDistance($stats->distance); |
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$wander->setAvgPace($stats->averagePace); |
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$wander->setAvgSpeed($stats->averageSpeed); |
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$wander->setMaxAltitude($stats->maxAltitude); |
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$wander->setMinAltitude($stats->minAltitude); |
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$wander->setCumulativeElevationGain($stats->cumulativeElevationGain); |
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} |
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catch(Exception $e) { |
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//$this->logger->debug("Couldn't set extended GPX property on wander: " . $e->getMessage()); |
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throw new Exception("Couldn't set standard GPX stats properties on wander.", 0, $e); |
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} |
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} |
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} |
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/** |
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* Update centroid and related angle from "home base" to the centroid, |
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* though now we're using our own library the definition of "centroid" |
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* is currently "the average of the latitude and longitude values", |
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* which is close enough for rock & roll. |
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*/ |
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private function updateCentroid(string $gpxxml, Wander $wander): void |
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{ |
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$polyline = Polyline::fromGpxData($gpxxml); |
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$centroid = $polyline->getCentroid(); |
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$wander->setCentroid([$centroid->getLat(), $centroid->getLng()]); |
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$angle = $this->compass(( |
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$centroid->getLng() - $this->homebaseCoords[1]), |
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($centroid->getLat() - $this->homebaseCoords[0]) |
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); |
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$wander->setAngleFromHome($angle); |
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} |
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/** |
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* Translate co-ordinates relative to 0, 0 into a compass direction in degrees. |
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*/ |
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public function compass(float $x, float $y): float |
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{ |
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// https://www.php.net/manual/en/function.atan2.php#88119 |
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if($x==0 AND $y==0){ return 0; } // ...or return 360 |
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return ($x < 0) |
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? rad2deg(atan2($x,$y)) + 360 |
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: rad2deg(atan2($x,$y)); |
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} |
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public function gpxToGeoJson(string $gpx, float $epsilon): string |
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{ |
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$polyline = Polyline::fromGpxData($gpx); |
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$simplifier = new PolylineRdpSimplifier($epsilon); |
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$simplifiedPolyline = $simplifier->ramerDouglasPeucker($polyline); |
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$formatter = new PolylineGeoJsonFormatter(); |
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return $formatter->format($simplifiedPolyline); |
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} |
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// TODO: This is updating more than the stats now. Change the name to |
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// reflect that. |
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public function updateWanderFromGpx(Wander $wander): void |
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{ |
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$filename = $wander->getGpxFilename(); |
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if (isset($filename)) |
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{ |
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// Basic stats, updated using phpGpx |
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$gpxxml = $this->getGpxStringFromFilename($filename); |
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$wander->setGeoJson($this->gpxToGeoJson($gpxxml, $this->wanderSimplifierEpsilonMetres)); |
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$this->updateGeneralStats($gpxxml, $wander); |
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$this->updateCentroid($gpxxml, $wander); |
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} |
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} |
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} |
gothick /
omm
