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<?php |
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/** |
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* EWKB (Extended Well Known Binary) Adapter |
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*/ |
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class EWKB extends WKB |
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{ |
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/** |
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* Read WKB binary string into geometry objects |
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* |
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* @param string $wkb An Extended-WKB binary string |
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* |
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* @return Geometry |
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*/ |
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public function read($wkb, $is_hex_string = FALSE) { |
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if ($is_hex_string) { |
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$wkb = pack('H*',$wkb); |
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} |
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// Open the wkb up in memory so we can examine the SRID |
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$mem = fopen('php://memory', 'r+'); |
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fwrite($mem, $wkb); |
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fseek($mem, 0); |
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$base_info = unpack("corder/ctype/cz/cm/cs", fread($mem, 5)); |
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if ($base_info['s']) { |
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$srid = current(unpack("Lsrid", fread($mem, 4))); |
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} |
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else { |
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$srid = NULL; |
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} |
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fclose($mem); |
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// Run the wkb through the normal WKB reader to get the geometry |
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$wkb_reader = new WKB(); |
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$geom = $wkb_reader->read($wkb); |
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// If there is an SRID, add it to the geometry |
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if ($srid) { |
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$geom->setSRID($srid); |
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} |
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return $geom; |
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} |
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/** |
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* Serialize geometries into an EWKB binary string. |
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* |
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* @param Geometry $geometry |
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* |
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* @return string The Extended-WKB binary string representation of the input geometries |
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*/ |
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public function write(Geometry $geometry, $write_as_hex = FALSE) { |
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// We always write into NDR (little endian) |
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$wkb = pack('c',1); |
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switch ($geometry->getGeomType()) { |
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case 'Point'; |
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$wkb .= pack('L',1); |
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$wkb .= $this->writePoint($geometry); |
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break; |
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case 'LineString'; |
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$wkb .= pack('L',2); |
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$wkb .= $this->writeLineString($geometry); |
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break; |
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case 'Polygon'; |
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$wkb .= pack('L',3); |
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$wkb .= $this->writePolygon($geometry); |
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break; |
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case 'MultiPoint'; |
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$wkb .= pack('L',4); |
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$wkb .= $this->writeMulti($geometry); |
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break; |
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case 'MultiLineString'; |
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$wkb .= pack('L',5); |
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$wkb .= $this->writeMulti($geometry); |
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break; |
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case 'MultiPolygon'; |
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$wkb .= pack('L',6); |
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$wkb .= $this->writeMulti($geometry); |
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break; |
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case 'GeometryCollection'; |
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$wkb .= pack('L',7); |
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$wkb .= $this->writeMulti($geometry); |
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break; |
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} |
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if ($write_as_hex) { |
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$unpacked = unpack('H*',$wkb); |
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return $unpacked[1]; |
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} |
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else { |
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return $wkb; |
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} |
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} |
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} |
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mprins /
dokuwiki-plugin-geophp
