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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 Smindel\GIS\ORM\FieldType\DBGeometry; |
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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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const WKT_PATTERN = '/^(([A-Z]+)\s*(\(.+\)))$/i'; |
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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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'multipoint' => 'MultiPoint', |
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'multilinestring' => 'MultiLineString', |
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'multipolygon' => 'MultiPolygon', |
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]; |
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private static $default_srid = 4326; |
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protected $value; |
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/** |
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* Constructor |
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* |
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* @param $value mixed geo value: |
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* string: wkt (default srid) or ewkt |
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* array: just coordinates (default srid, autodetect shape) or assoc with type, srid and coordinates |
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* GIS: extract value |
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* DBGeography: extract value |
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*/ |
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public function __construct($value) |
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{ |
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if ($value instanceof GIS) { |
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$this->value = $value->value; |
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} else if ($value instanceof DBGeography) { |
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$this->value = $value->getValue(); |
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} else if (is_string($value) && preg_match(self::WKT_PATTERN, $value)) { |
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$this->value = 'SRID=' . self::config()->default_srid . ';' . $value; |
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} else if ( |
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(is_array($value) && count($value) == 3 && isset($value['type'])) |
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|| (is_string($value) && preg_match(self::EWKT_PATTERN, $value)) |
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) { |
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$this->value = $value; |
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} else if (empty($value) || isset($value['coordinates']) && empty($value['coordinates'])) { |
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$this->value = null; |
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} else if (is_array($value) && !isset($value['type'])) { |
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switch (true) { |
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case is_numeric($value[0]): $type = 'Point'; break; |
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case is_numeric($value[0][0]): $type = 'LineString'; break; |
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case is_numeric($value[0][0][0]): $type = 'Polygon'; break; |
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case is_numeric($value[0][0][0][0]): $type = 'MultiPolygon'; break; |
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} |
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$this->value = [ |
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'srid' => GIS::config()->default_srid, |
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'type' => $type, |
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'coordinates' => $value, |
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]; |
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} else { |
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throw new Exception('Invalid geo value'); |
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} |
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} |
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public function __isset($property) |
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{ |
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return array_search($offset, ['array', 'ewkt', 'srid', 'type', 'coordinates']) !== false; |
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} |
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public function __get($property) |
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{ |
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if (isset($this->value[$property])) { |
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return $this->value[$property]; |
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} |
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switch ($property) { |
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case 'array': return ['srid' => $this->srid, 'type' => $this->type, 'coordinates' => $this->coordinates]; |
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case 'ewkt': return (string)$this; |
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case 'wkt': return explode(';', (string)$this)[1]; |
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case 'srid': return preg_match('/^SRID=(\d+);/i', $this->value, $matches) ? (int)$matches[1] : null; |
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case 'type': return preg_match('/^SRID=\d+;(' . implode('|', array_change_key_case(self::TYPES, CASE_UPPER)) . ')/i', $this->value, $matches) ? self::TYPES[strtolower($matches[1])] : null; |
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case 'coordinates': |
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if (preg_match(self::EWKT_PATTERN, $this->value, $matches)) { |
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$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 json_decode($coords, true)[0]; |
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} else return null; |
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default: throw new Exception('Unkown property ' . $property); |
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} |
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} |
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public function __toString() |
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{ |
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if (is_string($this->value)) return $this->value; |
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$type = isset($this->value['type']) ? strtoupper($this->value['type']) : null; |
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$srid = isset($this->value['srid']) ? $this->value['srid'] : GIS::config()->default_srid; |
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$array = isset($this->value['coordinates']) ? $this->value['coordinates'] : $this->value; |
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$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)" : $coords); |
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} |
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public function isNull() |
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{ |
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return empty($this->value) || isset($this->value['coordinates']) && empty($this->value['coordinates']); |
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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 $field; |
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} |
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} |
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} |
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/** |
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* reproject an array representation of a geometry to the given srid |
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*/ |
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public function reproject($toSrid = 4326) |
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{ |
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$fromSrid = $this->srid; |
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$fromCoordinates = $this->coordinates; |
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$type = $this->type; |
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if ($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 GIS::create([ |
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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, $callback) |
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{ |
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if ($coordinates instanceof GIS) { |
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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 function distance($geo) |
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{ |
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return DB::query('select ' . DB::get_schema()->translateDistanceQuery($this, GIS::create($geo)))->value(); |
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} |
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} |
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smindel /
silverstripe-gis
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