Implemented frosted ice

src/pocketmine/block/BlockFactory.php

@@ -136,6 +136,7 @@ class BlockFactory{
 		self::register(new Flower(new BID(Block::RED_FLOWER, Flower::TYPE_RED_TULIP), "Red Tulip"));
 		self::register(new Flower(new BID(Block::RED_FLOWER, Flower::TYPE_WHITE_TULIP), "White Tulip"));
 		self::register(new FlowerPot(new BID(Block::FLOWER_POT_BLOCK, 0, ItemIds::FLOWER_POT, \pocketmine\tile\FlowerPot::class), "Flower Pot"));
+		self::register(new FrostedIce(new BID(Block::FROSTED_ICE), "Frosted Ice"));
 		self::register(new Furnace(new BlockIdentifierFlattened(Block::FURNACE, Block::LIT_FURNACE, 0, null, \pocketmine\tile\Furnace::class), "Furnace"));
 		self::register(new Glass(new BID(Block::GLASS), "Glass"));
 		self::register(new GlassPane(new BID(Block::GLASS_PANE), "Glass Pane"));

src/pocketmine/block/FrostedIce.php

@@ -0,0 +1,115 @@
+<?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\BlockDataValidator;
+use function max;
+use function mt_rand;
+
+class FrostedIce extends Ice{
+
+	/** @var int */
+	protected $age = 0;
+
+	public function readStateFromData(int $id, int $stateMeta) : void{
+		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 3);
+	}
+
+	protected function writeStateToMeta() : int{
+		return $this->age;
+	}
+
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
+	public function getHardness() : float{
+		return 2.5;
+	}
+
+	public function onNearbyBlockChange() : void{
+		if(!$this->checkAdjacentBlocks(2)){
+			$this->level->useBreakOn($this);
+		}else{
+			$this->level->scheduleDelayedBlockUpdate($this, mt_rand(20, 40));
+		}
+	}
+
+	public function onRandomTick() : void{
+		if((!$this->checkAdjacentBlocks(4) or mt_rand(0, 2) === 0) and
+			max( //TODO: move this to Level
+				$this->level->getHighestAdjacentBlockLight($this->x, $this->y, $this->z),
+				$this->level->getHighestAdjacentBlockSkyLight($this->x, $this->y, $this->z) - $this->level->getSkyLightReduction()
+			) >= 12 - $this->age){
+			if($this->tryMelt()){
+				foreach($this->getAllSides() as $block){
+					if($block instanceof FrostedIce){
+						$block->tryMelt();
+					}
+				}
+			}
+		}else{
+			$this->level->scheduleDelayedBlockUpdate($this, mt_rand(20, 40));
+		}
+	}
+
+	public function onScheduledUpdate() : void{
+		$this->onRandomTick();
+	}
+
+	private function checkAdjacentBlocks(int $requirement) : bool{
+		$found = 0;
+		for($x = -1; $x <= 1; ++$x){
+			for($z = -1; $z <= 1; ++$z){
+				if($x === 0 and $z === 0){
+					continue;
+				}
+				if(
+					$this->level->getBlockAt($this->x + $x, $this->y, $this->z + $z) instanceof FrostedIce and
+					++$found >= $requirement
+				){
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Updates the age of the ice, destroying it if appropriate.
+	 *
+	 * @return bool Whether the ice was destroyed.
+	 */
+	private function tryMelt() : bool{
+		if($this->age >= 3){
+			$this->level->useBreakOn($this);
+			return true;
+		}
+
+		$this->age++;
+		$this->level->setBlock($this, $this);
+		$this->level->scheduleDelayedBlockUpdate($this, mt_rand(20, 40));
+		return false;
+	}
+}