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<?php |
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namespace Smindel\GIS; |
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use SilverStripe\Core\Config\Config; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Injector\Injectable; |
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use SilverStripe\ORM\DB; |
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use Smindel\GIS\ORM\FieldType\DBGeography; |
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use proj4php\Proj4php; |
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use proj4php\Proj; |
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use proj4php\Point; |
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use Exception; |
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class GIS |
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{ |
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use Configurable; |
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use Injectable; |
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private static $default_srid = 4326; |
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const EWKT_PATTERN = '/^SRID=(\d+);(([A-Z]+)\s*(\(.+\)))$/i'; |
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const TYPES = [ |
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'point' => 'Point', |
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'linestring' => 'LineString', |
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'polygon' => 'Polygon', |
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'multipolygon' => 'MultiPolygon', |
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]; |
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public static function of($dataObjectClass) |
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{ |
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if ($field = $dataObjectClass::config()->get('default_geo_field')) { |
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return $field; |
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} |
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foreach ($dataObjectClass::config()->get('db') ?: [] as $field => $type) { |
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if ($type == 'Geography' || $type == 'Geometry') { |
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return $field; |
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} |
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} |
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} |
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public static function to_ewkt($geo) |
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{ |
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if (is_string($geo)) return $geo; |
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if ($geo instanceof DBGeography) $geo = $geo->getValue(); |
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$type = isset($geo['type']) ? strtoupper($geo['type']) : null; |
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$srid = isset($geo['srid']) ? $geo['srid'] : Config::inst()->get(self::class, 'default_srid'); |
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$array = isset($geo['coordinates']) ? $geo['coordinates'] : $geo; |
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if (!$type) { |
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switch (true) { |
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case is_numeric($array[0]): $type = 'POINT'; break; |
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case is_numeric($array[0][0]): $type = 'LINESTRING'; break; |
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case is_numeric($array[0][0][0]): $type = 'POLYGON'; break; |
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case is_numeric($array[0][0][0][0]): $type = 'MULTIPOLYGON'; break; |
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} |
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} |
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$replacements = [ |
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'/(?<=\d),(?=-|\d)/' => ' ', |
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'/\[\[\[\[/' => '(((', |
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'/\]\]\]\]/' => ')))', |
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'/\[\[\[/' => '((', |
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'/\]\]\]/' => '))', |
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'/\[\[/' => '(', |
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'/\]\]/' => ')', |
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'/\[/' => '', |
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'/\]/' => '', |
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]; |
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$coords = preg_replace(array_keys($replacements), array_values($replacements), json_encode($array)); |
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return sprintf('SRID=%d;%s%s', $srid, $type, $type == 'POINT' ? "($coords)" : $coords); |
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} |
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public static function to_array($geo) |
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{ |
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if ($geo instanceof DBGeography) $geo = $geo->getValue(); |
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if (is_array($geo)) { |
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if (isset($geo['coordinates'])) return $geo; |
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switch (true) { |
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case is_numeric($geo[0]): $type = 'Point'; break; |
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case is_numeric($geo[0][0]): $type = 'LineString'; break; |
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case is_numeric($geo[0][0][0]): $type = 'Polygon'; break; |
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case is_numeric($geo[0][0][0][0]): $type = 'MultiPolygon'; break; |
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} |
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return [ |
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'srid' => Config::inst()->get(self::class, 'default_srid'), |
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'type' => $type, |
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'coordinates' => $geo |
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]; |
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} |
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if (preg_match(self::EWKT_PATTERN, $geo, $matches)) { |
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$coords = str_replace(['(', ')'], ['[', ']'], preg_replace('/([\d\.-]+)\s+([\d\.-]+)/', "[$1,$2]", $matches[4])); |
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if (strtolower($matches[3]) != 'point') { |
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$coords = "[$coords]"; |
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} |
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return [ |
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'srid' => $matches[1], |
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'type' => self::TYPES[strtolower($matches[3])], |
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'coordinates' => json_decode($coords, true)[0], |
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]; |
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} |
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} |
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public static function split_ewkt($ewkt, $fallbackSrid = null) |
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{ |
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$fallbackSrid = $fallbackSrid ?: Config::inst()->get(self::class, 'default_srid'); |
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if (preg_match(GIS::EWKT_PATTERN, $ewkt, $matches)) { |
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$wkt = $matches[2]; |
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$srid = (int)$matches[1]; |
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} else { |
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$wkt = $ewkt; |
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$srid = (int)$fallbackSrid; |
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} |
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return [$wkt, $srid]; |
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} |
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public static function get_type($geo) |
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{ |
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if (is_array($geo) && isset($geo['type'])) { |
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return self::TYPES[strtolower($geo['type'])]; |
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} elseif (is_array($geo)) { |
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$geo = self::to_ewkt($geo); |
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} |
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if (preg_match( |
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'/;(' . implode('|', array_keys(self::TYPES)) . ')\(/i', |
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strtolower(substr($geo, 8, 30)), |
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$matches |
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)) { |
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return self::TYPES[$matches[1]]; |
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} |
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} |
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/** |
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* reproject an array representation of a geometry to the given srid |
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*/ |
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public static function reproject($geo, $toSrid = 4326) |
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{ |
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$array = self::to_array($geo); |
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$fromSrid = $array['srid']; |
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$fromCoordinates = $array['coordinates']; |
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$type = $array['type']; |
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if ($fromSrid != $toSrid) { |
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$fromProj = self::get_proj4($fromSrid); |
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$toProj = self::get_proj4($toSrid); |
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$toCoordinates = self::reproject_array($fromCoordinates, $fromProj, $toProj); |
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} else { |
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$toCoordinates = $fromCoordinates; |
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} |
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return [ |
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'srid' => $toSrid, |
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'type' => $type, |
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'coordinates' => $toCoordinates, |
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]; |
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} |
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/** |
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* @var proj4php instance |
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*/ |
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protected static $proj4; |
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protected static function get_proj4($srid) |
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{ |
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self::$proj4 = self::$proj4 ?: new Proj4php(); |
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if (!self::$proj4->hasDef('EPSG:' . $srid)) { |
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$projDefs = Config::inst()->get(self::class, 'projections'); |
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if (!isset($projDefs[$srid])) { |
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throw new Exception("Cannot use unregistered SRID $srid. Register it's <a href=\"http://spatialreference.org/ref/epsg/$srid/proj4/\">PROJ.4 definition</a> in GIS::projections."); |
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} |
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self::$proj4->addDef('EPSG:' . $srid, $projDefs[$srid]); |
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} |
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return new Proj('EPSG:' . $srid, self::$proj4); |
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} |
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protected static function reproject_array($coordinates, $fromProj, $toProj) |
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{ |
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return self::each($coordinates, function($coordinate) use ($fromProj, $toProj) { |
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return array_slice(self::$proj4->transform($toProj, new Point($coordinate[0], $coordinate[1], $fromProj))->toArray(), 0, 2); |
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}); |
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} |
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public static function each($coordinates, $callback) |
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{ |
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if (isset($coordinates['coordinates'])) { |
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$coordinates = $coordinates['coordinates']; |
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} |
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if (is_array($coordinates[0])) { |
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foreach ($coordinates as &$coordinate) { |
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$coordinate = self::each($coordinate, $callback); |
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} |
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return $coordinates; |
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} |
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return $callback($coordinates); |
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} |
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public static function distance($geo1, $geo2) |
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{ |
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return DB::query('select ' . DB::get_schema()->translateDistanceQuery($geo1, $geo2))->value(); |
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} |
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} |
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smindel /
silverstripe-gis
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