/**
* Given an object or a string, return a Geometry
*
* @param mixed $input The GeoJSON string or object
*
* @return object Geometry
*/
public function read($input)
{
if (is_string($input)) {
$input = json_decode($input);
}
if (!is_object($input)) {
throw new FOX_exception(array('numeric' => 1, 'text' => "Invalid input parameter. Must be an object.", 'data' => $input, 'file' => __FILE__, 'class' => __CLASS__, 'function' => __FUNCTION__, 'line' => __LINE__, 'child' => null));
}
if (!is_string($input->type)) {
throw new FOX_exception(array('numeric' => 2, 'text' => "Invalid input parameter 'type' specifier. Must be a string.", 'data' => $input, 'file' => __FILE__, 'class' => __CLASS__, 'function' => __FUNCTION__, 'line' => __LINE__, 'child' => null));
}
// Check to see if it's a FeatureCollection
if ($input->type == 'FeatureCollection') {
$geoms = array();
foreach ($input->features as $feature) {
$geoms[] = $this->read($feature);
}
return FOX_geo::geometryReduce($geoms);
}
// Check to see if it's a Feature
if ($input->type == 'Feature') {
return $this->read($input->geometry);
}
// It's a geometry - process it
return $this->objToGeom($input);
}
public function centroid()
{
if ($this->isEmpty()) {
return null;
}
if ($this->geos()) {
return FOX_geo::geosToGeometry($this->geos()->centroid());
}
$exterior_ring = $this->components[0];
$pts = $exterior_ring->getComponents();
$c = count($pts);
if ((int) $c == '0') {
return null;
}
$cn = array('x' => '0', 'y' => '0');
$a = $this->area(true, true);
// If this is a polygon with no area. Just return the first point.
if ($a == 0) {
return $this->exteriorRing()->pointN(1);
}
foreach ($pts as $k => $p) {
$j = ($k + 1) % $c;
$P = $p->getX() * $pts[$j]->getY() - $p->getY() * $pts[$j]->getX();
$cn['x'] = $cn['x'] + ($p->getX() + $pts[$j]->getX()) * $P;
$cn['y'] = $cn['y'] + ($p->getY() + $pts[$j]->getY()) * $P;
}
$cn['x'] = $cn['x'] / (6 * $a);
$cn['y'] = $cn['y'] / (6 * $a);
$centroid = new FOX_point($cn['x'], $cn['y']);
return $centroid;
}
public function geomFromXML()
{
$geometries = array();
$geometries = array_merge($geometries, $this->parseWaypoints());
$geometries = array_merge($geometries, $this->parseTracks());
$geometries = array_merge($geometries, $this->parseRoutes());
if (empty($geometries)) {
throw new FOX_exception(array('numeric' => 1, 'text' => "Invalid GPX data string", 'data' => $geometries, 'file' => __FILE__, 'class' => __CLASS__, 'function' => __FUNCTION__, 'line' => __LINE__, 'child' => null));
}
return FOX_geo::geometryReduce($geometries);
}
public function geomFromXML()
{
$geometries = array();
$geometries = array_merge($geometries, $this->parsePoints());
$geometries = array_merge($geometries, $this->parseLines());
$geometries = array_merge($geometries, $this->parsePolygons());
$geometries = array_merge($geometries, $this->parseBoxes());
$geometries = array_merge($geometries, $this->parseCircles());
if (empty($geometries)) {
throw new FOX_exception(array('numeric' => 1, 'text' => "Invalid or empty GeoRSS data", 'data' => $geometries, 'file' => __FILE__, 'class' => __CLASS__, 'function' => __FUNCTION__, 'line' => __LINE__, 'child' => null));
}
return FOX_geo::geometryReduce($geometries);
}
public function simplify($tolerance, $preserveTopology = false)
{
if ($this->geos()) {
return FOX_geo::geosToGeometry($this->geos()->simplify($tolerance, $preserveTopology));
}
}
public function parseGeometryCollection($xml)
{
$components = array();
$geom_types = FOX_geo::geometryList();
foreach ($xml->childNodes as $child) {
$nodeName = $child->nodeName == 'linearring' ? 'linestring' : $child->nodeName;
if (array_key_exists($nodeName, $geom_types)) {
$function = 'parse' . $geom_types[$nodeName];
$components[] = $this->{$function}($child);
}
}
return new FOX_geometryCollection($components);
}
/**
* Serialize geometries into a WKT string.
*
* @param Geometry $geometry
*
* @return string The WKT string representation of the input geometries
*/
public function write(FOX_geometry $geometry)
{
// If geos is installed, then we take a shortcut and let it write the WKT
if (FOX_geo::geosInstalled()) {
$writer = new GEOSWKTWriter();
$writer->setTrim(true);
return $writer->write($geometry->geos());
}
if ($geometry->isEmpty()) {
return strtoupper($geometry->geometryType()) . ' EMPTY';
} else {
$data = $this->extractData($geometry);
if ($data) {
return strtoupper($geometry->geometryType()) . ' (' . $data . ')';
} else {
return null;
}
}
}
public function boundary()
{
if ($this->isEmpty()) {
return new LineString();
}
if ($this->geos()) {
return $this->geos()->boundary();
}
$components_boundaries = array();
foreach ($this->components as $component) {
$components_boundaries[] = $component->boundary();
}
return FOX_geo::geometryReduce($components_boundaries);
}