Implemented coral and coral fans

this implementation is very rough due to having to hack around lots more MCPE bullshit, and currently doesn't allow dynamic coral types; but it's there. We'll clean this up after 1.13 migration is done.

src/block/FloorCoralFan.php

@@ -0,0 +1,111 @@
+<?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\block;
+
+use pocketmine\block\utils\CoralType;
+use pocketmine\data\bedrock\CoralTypeIdMap;
+use pocketmine\item\Item;
+use pocketmine\item\ItemFactory;
+use pocketmine\item\ItemIds;
+use pocketmine\math\Axis;
+use pocketmine\math\Vector3;
+use pocketmine\player\Player;
+use pocketmine\world\BlockTransaction;
+use function atan2;
+use function rad2deg;
+
+final class FloorCoralFan extends BaseCoral{
+	/** @var BlockIdentifierFlattened */
+	protected $idInfo;
+
+	private int $axis = Axis::X;
+
+	public function __construct(BlockIdentifierFlattened $idInfo, string $name, BlockBreakInfo $breakInfo, CoralType $coralType){
+		parent::__construct($idInfo, $name, $breakInfo, $coralType);
+	}
+
+	public function readStateFromData(int $id, int $stateMeta) : void{
+		$this->dead = $id === $this->idInfo->getSecondId();
+		$this->axis = ($stateMeta >> 3) === BlockLegacyMetadata::CORAL_FAN_EAST_WEST ? Axis::X : Axis::Z;
+	}
+
+	public function getId() : int{
+		return $this->dead ? $this->idInfo->getSecondId() : parent::getId();
+	}
+
+	public function asItem() : Item{
+		//TODO: HACK! workaround dead flag being lost when broken / blockpicked (original impl only uses first ID)
+		return ItemFactory::getInstance()->get(
+			$this->dead ? ItemIds::CORAL_FAN_DEAD : ItemIds::CORAL_FAN,
+			CoralTypeIdMap::getInstance()->toId($this->coralType)
+		);
+	}
+
+	protected function writeStateToMeta() : int{
+		return ($this->axis === Axis::X ? BlockLegacyMetadata::CORAL_FAN_EAST_WEST : BlockLegacyMetadata::CORAL_FAN_NORTH_SOUTH) << 3;
+	}
+
+	public function getStateBitmask() : int{
+		return 0b1000;
+	}
+
+	public function getAxis() : int{ return $this->axis; }
+
+	/** @return $this */
+	public function setAxis(int $axis) : self{
+		if($axis !== Axis::X && $axis !== Axis::Z){
+			throw new \InvalidArgumentException("Axis must be X or Z only");
+		}
+		$this->axis = $axis;
+		return $this;
+	}
+
+	public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
+		if(!$tx->fetchBlock($blockReplace->getPos()->down())->isSolid()){
+			return false;
+		}
+		if($player !== null){
+			$playerBlockPos = $player->getPosition()->floor();
+			$directionVector = $blockReplace->getPos()->subtractVector($playerBlockPos)->normalize();
+			$angle = rad2deg(atan2($directionVector->getZ(), $directionVector->getX()));
+
+			if($angle <= 45 || 315 <= $angle || (135 <= $angle && $angle <= 225)){
+				//TODO: This produces Z axis 75% of the time, because any negative angle will produce Z axis.
+				//This is a bug in vanilla. https://bugs.mojang.com/browse/MCPE-125311
+				$this->axis = Axis::Z;
+			}
+		}
+		return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
+	}
+
+	public function onNearbyBlockChange() : void{
+		$world = $this->pos->getWorld();
+		if(!$world->getBlock($this->pos->down())->isSolid()){
+			$world->useBreakOn($this->pos);
+		}else{
+			parent::onNearbyBlockChange();
+		}
+	}
+
+}