/**
* @param BattleshipInterface $battleship
* @param PointInterface $start
* @param PointInterface $end
*/
public function __construct(BattleshipInterface $battleship, PointInterface $start, PointInterface $end)
{
/*
* placer should allow ony
* ---->
* OR
* |
* |
* \/
*
* But not <-----
* Instead of throw error, $start and $end could be exchanged.
*/
if ($start->getX() > $end->getX() || $start->getY() > $end->getY()) {
throw new Exception\Exception("Points missmatch");
}
$this->battleship = $battleship;
$this->startPoint = $start;
$this->endPoint = $end;
if ($this->getPoints()->count() !== $battleship->getSize()) {
throw new Exception\Exception('Can\'t fit battleship in placer');
}
}
/**
* Get available placers for battleship
* @param BattleshipInterface $battleship
* @return Placer[]
*/
public function getValidPlaces(BattleshipInterface $battleship)
{
$potentialPlacements = [];
$battleshipSize = $battleship->getSize();
for ($yIndex = 0; $yIndex < $this->fieldHeight; $yIndex++) {
for ($xIndex = 0; $xIndex < $this->fieldWidth; $xIndex++) {
$horizontalValidation = true;
$verticalValidation = true;
for ($i = 0; $i < $battleshipSize; $i++) {
if ($horizontalValidation) {
$pointToCheck = new Point($xIndex + $i, $yIndex);
if (!$this->isPointFree($pointToCheck)) {
$horizontalValidation = false;
}
}
if ($verticalValidation) {
$pointToCheck = new Point($xIndex, $yIndex + $i);
if (!$this->isPointFree($pointToCheck)) {
$verticalValidation = false;
}
}
if (!$horizontalValidation && !$verticalValidation) {
break;
}
}
if ($verticalValidation) {
$potentialPlacements[] = new Placer($battleship, new Point($xIndex, $yIndex), new Point($xIndex, $yIndex + $battleshipSize - 1));
}
if ($horizontalValidation) {
$potentialPlacements[] = new Placer($battleship, new Point($xIndex, $yIndex), new Point($xIndex + $battleshipSize - 1, $yIndex));
}
}
}
return $potentialPlacements;
}