115 lines
4.4 KiB
PHP
115 lines
4.4 KiB
PHP
<?php
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declare(strict_types=1);
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namespace OCA\Memories\Db;
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use OCP\DB\QueryBuilder\IQueryBuilder;
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use OCP\IDBConnection;
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const CLUSTER_DEG = 0.0003;
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trait TimelineWriteMap
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{
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protected IDBConnection $connection;
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protected function getMapCluster(int $prevCluster, float $lat, float $lon): int
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{
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// Get all possible clusters within CLUSTER_DEG radius
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$query = $this->connection->getQueryBuilder();
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$query->select('id', 'lat', 'lon')
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->from('memories_mapclusters')
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->andWhere($query->expr()->gte('lat', $query->createNamedParameter($lat - CLUSTER_DEG, IQueryBuilder::PARAM_STR)))
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->andWhere($query->expr()->lte('lat', $query->createNamedParameter($lat + CLUSTER_DEG, IQueryBuilder::PARAM_STR)))
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->andWhere($query->expr()->gte('lon', $query->createNamedParameter($lon - CLUSTER_DEG, IQueryBuilder::PARAM_STR)))
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->andWhere($query->expr()->lte('lon', $query->createNamedParameter($lon + CLUSTER_DEG, IQueryBuilder::PARAM_STR)))
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;
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$rows = $query->executeQuery()->fetchAll();
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// Find cluster closest to the point
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$minDist = PHP_INT_MAX;
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$minId = -1;
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foreach ($rows as $r) {
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$clusterLat = (float) $r['lat'];
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$clusterLon = (float) $r['lon'];
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$dist = ($lat - $clusterLat) ** 2 + ($lon - $clusterLon) ** 2;
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if ($dist < $minDist) {
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$minDist = $dist;
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$minId = $r['id'];
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}
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}
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// If no cluster found, create a new one
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if ($minId <= 0) {
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$this->removeFromCluster($prevCluster, $lat, $lon);
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return $this->createMapCluster($lat, $lon);
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}
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// If the file was previously in the same cluster, return that
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if ($prevCluster === $minId) {
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return $minId;
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}
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// If the file was previously in a different cluster,
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// remove it from the first cluster and add it to the second
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$this->removeFromCluster($prevCluster, $lat, $lon);
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$this->addToCluster($minId, $lat, $lon);
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return $minId;
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}
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protected function addToCluster(int $clusterId, float $lat, float $lon): void
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{
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if ($clusterId <= 0) {
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return;
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}
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$query = $this->connection->getQueryBuilder();
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$query->update('memories_mapclusters')
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->set('point_count', $query->createFunction('point_count + 1'))
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->set('lat_sum', $query->createFunction("lat_sum + {$lat}"))
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->set('lon_sum', $query->createFunction("lon_sum + {$lon}"))
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->set('lat', $query->createFunction('lat_sum / point_count'))
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->set('lon', $query->createFunction('lon_sum / point_count'))
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->where($query->expr()->eq('id', $query->createNamedParameter($clusterId, IQueryBuilder::PARAM_INT)))
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;
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$query->executeStatement();
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}
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private function createMapCluster(float $lat, float $lon): int
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{
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$query = $this->connection->getQueryBuilder();
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$query->insert('memories_mapclusters')
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->values([
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'point_count' => $query->createNamedParameter(1, IQueryBuilder::PARAM_INT),
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'lat_sum' => $query->createNamedParameter($lat, IQueryBuilder::PARAM_STR),
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'lon_sum' => $query->createNamedParameter($lon, IQueryBuilder::PARAM_STR),
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'lat' => $query->createNamedParameter($lat, IQueryBuilder::PARAM_STR),
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'lon' => $query->createNamedParameter($lon, IQueryBuilder::PARAM_STR),
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])
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;
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$query->executeStatement();
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return (int) $query->getLastInsertId();
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}
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private function removeFromCluster(int $clusterId, float $lat, float $lon): void
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{
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if ($clusterId <= 0) {
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return;
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}
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$query = $this->connection->getQueryBuilder();
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$query->update('memories_mapclusters')
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->set('point_count', $query->createFunction('point_count - 1'))
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->set('lat_sum', $query->createFunction("lat_sum - {$lat}"))
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->set('lon_sum', $query->createFunction("lon_sum - {$lon}"))
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->set('lat', $query->createFunction('lat_sum / point_count'))
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->set('lon', $query->createFunction('lon_sum / point_count'))
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->where($query->expr()->eq('id', $query->createNamedParameter($clusterId, IQueryBuilder::PARAM_INT)))
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;
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$query->executeStatement();
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}
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}
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