/**
* Convert the geometry to geohash.
* @return string the geohash or null when the $geometry is not a Point
* @param Point $geometry
* @see GeoAdapter::write()
*/
public function write(Geometry $geometry, $precision = NULL)
{
if ($geometry->isEmpty()) {
return '';
}
if ($geometry->geometryType() === 'Point') {
return $this->encodePoint($geometry, $precision);
} else {
// The geohash is the hash grid ID that fits the envelope
$envelope = $geometry->envelope();
$geohashes = array();
$geohash = '';
foreach ($envelope->getPoints() as $point) {
$geohashes[] = $this->encodePoint($point, 1.0E-7);
}
$i = 0;
while ($i < strlen($geohashes[0])) {
$char = $geohashes[0][$i];
foreach ($geohashes as $hash) {
if ($hash[$i] != $char) {
return $geohash;
}
}
$geohash .= $char;
$i++;
}
return $geohash;
}
}
/**
* Serialize geometries into a GPX string.
*
* @param Geometry $geometry
*
* @return string The GPX string representation of the input geometries
*/
public function write(Geometry $geometry, $namespace = FALSE)
{
if ($geometry->isEmpty()) {
return NULL;
}
if ($namespace) {
$this->namespace = $namespace;
$this->nss = $namespace . ':';
}
return '<' . $this->nss . 'gpx creator="geoPHP" version="1.0">' . $this->geometryToGPX($geometry) . '</' . $this->nss . 'gpx>';
}
/**
* Serialize geometries into a WKT string.
*
* @param Geometry $geometry
*
* @return string The WKT string representation of the input geometries
*/
public function write(Geometry $geometry)
{
// If geos is installed, then we take a shortcut and let it write the WKT
if (GeoPHP::geosInstalled()) {
$writer = new GEOSWKTWriter();
$writer->setTrim(TRUE);
return $writer->write($geometry->geos());
}
if ($geometry->isEmpty()) {
return strtoupper($geometry->geometryType()) . ' EMPTY';
} else {
if ($data = $this->extractData($geometry)) {
return strtoupper($geometry->geometryType()) . ' (' . $data . ')';
}
}
}