Implemented End Crystal (#4715)

Co-authored-by: Dylan T. <dktapps@pmmp.io>

src/item/EndCrystal.php

@@ -0,0 +1,59 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\item;
+
+use pocketmine\block\Block;
+use pocketmine\block\BlockTypeIds;
+use pocketmine\entity\Location;
+use pocketmine\entity\object\EndCrystal as EntityEndCrystal;
+use pocketmine\math\AxisAlignedBB;
+use pocketmine\math\Facing;
+use pocketmine\math\Vector3;
+use pocketmine\player\Player;
+use function count;
+
+class EndCrystal extends Item{
+
+	public function onInteractBlock(Player $player, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, array &$returnedItems) : ItemUseResult{
+		if($blockClicked->getTypeId() === BlockTypeIds::OBSIDIAN || $blockClicked->getTypeId() === BlockTypeIds::BEDROCK){
+			$pos = $blockClicked->getPosition();
+			$world = $pos->getWorld();
+			$bb = AxisAlignedBB::one()
+				->offset($pos->getX(), $pos->getY(), $pos->getZ())
+				->extend(Facing::UP, 1);
+			if(
+				count($world->getNearbyEntities($bb)) === 0 &&
+				$blockClicked->getSide(Facing::UP)->getTypeId() === BlockTypeIds::AIR &&
+				$blockClicked->getSide(Facing::UP, 2)->getTypeId() === BlockTypeIds::AIR
+			){
+				$crystal = new EntityEndCrystal(Location::fromObject($pos->add(0.5, 1, 0.5), $world));
+				$crystal->spawnToAll();
+
+				$this->pop();
+				return ItemUseResult::SUCCESS;
+			}
+		}
+		return ItemUseResult::NONE;
+	}
+}