/**
* Find the shortest path from starting region to destination region using
* breadth-first search (BFS). Don't know if it's according to spec, but it
* works.
*
* @param \Mastercoding\Conquest\Object\map $map
* @param \Mastercoding\Conquest\Object\Region $startingRegion
* @param \Mastercoding\Conquest\Object\Region $destinationRegion
* @param bool $onlyYours
*/
public static function shortestPath(\Mastercoding\Conquest\Object\map $map, \Mastercoding\Conquest\Object\Region $startingRegion, \Mastercoding\Conquest\Object\Region $destinationRegion, $onlyYours = false)
{
// same?
if ($startingRegion->getId() == $destinationRegion->getId()) {
throw new \Exception('Starting region is destination region');
}
// level
$level = 0;
// loop queue
$queue = array($startingRegion);
$visited = array($startingRegion->getId() => true);
// list keeping
$parents = array();
// loop
for ($i = 0; $i < count($queue); $i++) {
foreach ($queue[$i]->getNeighbors() as $neighbor) {
// yours
if ($onlyYours && $neighbor->getOwner() != $map->getYou()) {
continue;
}
// mark visited and track path
if (!isset($visited[$neighbor->getId()])) {
$parents[$neighbor->getId()] = $queue[$i];
$visited[$neighbor->getId()] = true;
// add neighbors to queue
if ($neighbor->hasNeighbors()) {
$queue[] = $neighbor;
}
}
// this one the one we want?
if ($neighbor->getId() == $destinationRegion->getId()) {
// the end
$object = $neighbor;
$path = array();
// track back path
$j = 0;
while (is_object($object) && ++$j) {
$path[] = $object;
$object = isset($parents[$object->getId()]) ? $parents[$object->getId()] : null;
}
return $path;
}
}
}
// no path
return null;
}
/**
* Check if all neighbors are neutral or yours
*
* @param \Mastercoding\Conquest\Object\Map $map
* @param \Mastercoding\Conquest\Object\Region $region
*/
public static function allYoursOrDifferentContinentNeutral(\Mastercoding\Conquest\Object\map $map, \Mastercoding\Conquest\Object\Region $region)
{
// neighbors
foreach ($region->getNeighbors() as $neighbor) {
// not all mine, continue in parent loop
if ($neighbor->getOwner() == $map->getYou()) {
continue;
}
// neutral and same continent
if ($neighbor->getOwner()->getName() == \Mastercoding\Conquest\Object\Owner\AbstractOwner::NEUTRAL && $neighbor->getContinentId() != $region->getContinentId()) {
continue;
}
// false
return false;
}
return true;
}