public static function fromXmlObj(SimpleXMLElement $xmlObj)
{
$relation = new OSM_Objects_Relation();
$processedElements = $relation->_fromXmlObj($xmlObj);
foreach ($xmlObj->children() as $child) {
if (in_array($child->getName(), $processedElements)) {
continue;
}
OSM_ZLog::debug(__METHOD__, 'Found child: ', $child->getName());
switch ($child->getName()) {
case self::OBJTYPE_MEMBER:
$member = OSM_Objects_Member::fromXmlObj($child);
$relation->addMember($member);
break;
default:
throw new OSM_Exception('Object "' . $xmlObj->getName() . '" is not supported in relation');
}
}
$relation->setDirty(false);
return $relation;
}
/**
* Return relation's way ordered by nodes position, like we can draw a well formed polygon.
*
* @param OSM_Objects_Relation $relation
* @return OSM_Objects_Way[]
*/
public function getRelationWaysOrdered(OSM_Objects_Relation $relation)
{
$membersWays = $relation->findMembersByType(self::OBJTYPE_WAY);
$w1 = $membersWays[0];
if (!array_key_exists($w1->getRef(), $this->_ways)) {
throw new OSM_Exception('Way not loaded, you must load the full relation.');
}
$waysOrderedIds = array();
$waysOrdered = array();
$ww1 = $this->_ways[$w1->getRef()];
$waysOrderedIds[$ww1->getId()] = $ww1;
$waysOrdered[] = $ww1;
for ($i = 0; $i < count($membersWays); $i++) {
if (!array_key_exists($w1->getRef(), $this->_ways)) {
throw new OSM_Exception('Way not loaded, you must load the full relation.');
}
$ww1 = $this->_ways[$w1->getRef()];
for ($j = 0; $j < count($membersWays); $j++) {
$w2 = $membersWays[$j];
if ($w1->getRef() == $w2->getRef()) {
continue;
}
if (array_key_exists($w2->getRef(), $waysOrderedIds)) {
continue;
}
if (!array_key_exists($w2->getRef(), $this->_ways)) {
throw new OSM_Exception('Way not loaded, you must load the full relation.');
}
$ww2 = $this->_ways[$w2->getRef()];
$nId1F = $ww1->getFirstNodeRef();
$nId1L = $ww1->getLastNodeRef();
$nId2F = $ww2->getFirstNodeRef();
$nId2L = $ww2->getLastNodeRef();
if ($nId1F == $nId2F || $nId1F == $nId2L || $nId1L == $nId2F || $nId1L == $nId2L) {
$waysOrderedIds[$ww2->getId()] = $ww2;
$waysOrdered[] = $ww2;
$w1 = $w2;
break;
}
}
}
return $waysOrdered;
}
