src/com/apocalyptech/minecraft/xray/MinecraftLevel.java - minecraft/minecraftxray - Rivoreo Source Code Repositories

 /**
  * Copyright (c) 2010-2011, Vincent Vollers and Christopher J. Kucera
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
  *       notice, this list of conditions and the following disclaimer in the
  *       documentation and/or other materials provided with the distribution.
  *     * Neither the name of the Minecraft X-Ray team nor the
  *       names of its contributors may be used to endorse or promote products
  *       derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL VINCENT VOLLERS OR CJ KUCERA BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package com.apocalyptech.minecraft.xray;

 import java.io.File;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.ArrayList;

 import com.apocalyptech.minecraft.xray.dtf.CompoundTag;
 import com.apocalyptech.minecraft.xray.dtf.DTFReader;
 import com.apocalyptech.minecraft.xray.dtf.DoubleTag;
 import com.apocalyptech.minecraft.xray.dtf.FloatTag;
 import com.apocalyptech.minecraft.xray.dtf.IntTag;
 import com.apocalyptech.minecraft.xray.dtf.ListTag;
 import com.apocalyptech.minecraft.xray.dtf.StringTag;
 import com.apocalyptech.minecraft.xray.dtf.LongTag;
 import com.apocalyptech.minecraft.xray.dtf.Tag;

 /***
  * A Minecraft level
  * @author Vincent
  */
 public class MinecraftLevel {

 	//public static int LEVELDATA_SIZE = 256;
 	public static int LEVELDATA_SIZE = 128;
 	public static int LEVELDATA_OFFSET = Integer.MAX_VALUE/2;
 	public Chunk[][] levelData;

 	private WorldInfo world;

 	// This var holds the index of the player position we've most recently picked
 	private ArrayList<CameraPreset> playerPositions;
 	private int playerPos_idx;
 	private int spawnPoint_idx;
 	private long randomSeed;
 	public short[] HIGHLIGHT_ORES;

 	public ArrayList<Texture> minecraftTextures;
 	public Texture paintingTexture;

 	public String levelName;

 	/**
 	 * Given a WorldInfo object, return its user-defined name.  There's
 	 * some duplication here from the constructor object, but I think that's
 	 * okay for this case.
 	 */
 	public static String getLevelName(WorldInfo world)
 	{
 		File levelFile = world.getLevelDatFile();
 		CompoundTag levelData = (CompoundTag) DTFReader.readDTFFile(levelFile);
 		CompoundTag levelDataData = (CompoundTag) levelData.getTagWithName("Data");
 		StringTag levelNameTag = (StringTag) levelDataData.getTagWithName("LevelName");
 		if (levelNameTag != null)
 		{
 			return levelNameTag.value;
 		}
 		else
 		{
 			return null;
 		}
 	}

 	/***
 	 * Create a minecraftLevel from the given world
 	 * @param world
 	 */
 	public MinecraftLevel(WorldInfo world, ArrayList<Texture> minecraftTextures, Texture paintingTexture, short[] HIGHLIGHT_ORES) {
 		this.world = world;
 		this.minecraftTextures = minecraftTextures;
 		this.paintingTexture = paintingTexture;
 		this.HIGHLIGHT_ORES = HIGHLIGHT_ORES;

 		this.levelData = new Chunk[LEVELDATA_SIZE][LEVELDATA_SIZE];

 		File levelFile = world.getLevelDatFile();

 		CompoundTag levelData = (CompoundTag) DTFReader.readDTFFile(levelFile);

 		//	XRay.logger.trace(levelData.toString());

 		this.playerPositions = new ArrayList<CameraPreset>();
 		this.playerPos_idx = -1;
 		this.spawnPoint_idx = -1;

 		CompoundTag levelDataData = (CompoundTag) levelData.getTagWithName("Data");
 		CompoundTag levelPlayerData = (CompoundTag) levelDataData.getTagWithName("Player");
 		if(levelPlayerData != null) {

 			// Figure out what dimension the player's in.  If it matches, move our camera there.
 			IntTag playerDim = (IntTag) levelPlayerData.getTagWithName("Dimension");
 			if ((playerDim == null && world.isOverworld()) || (playerDim != null && ((playerDim.value == 0 && world.isOverworld()) || (playerDim.value == world.getDimension()))))
 			{
 				ListTag playerPos = (ListTag) levelPlayerData .getTagWithName("Pos");
 				ListTag playerRotation = (ListTag) levelPlayerData .getTagWithName("Rotation");

 				DoubleTag posX = (DoubleTag) playerPos.value.get(0);
 				DoubleTag posY = (DoubleTag) playerPos.value.get(1);
 				DoubleTag posZ = (DoubleTag) playerPos.value.get(2);

 				FloatTag rotYaw = (FloatTag) playerRotation.value.get(0);
 				FloatTag rotPitch = (FloatTag) playerRotation.value.get(1);

 				this.playerPositions.add(new CameraPreset(0, "Singleplayer User", new Block((int) -posX.value, (int) -posY.value, (int) -posZ.value+1),
 						rotYaw.value, rotPitch.value));
 				this.playerPos_idx = 0;
 			}
 		}

 		// Get a list of MP users that can provide valid camera positions for us
 		CompoundTag mpuserData;
 		for (String mpusername : world.mp_players.keySet())
 		{
 			try
 			{
 				mpuserData = (CompoundTag) DTFReader.readDTFFile(world.mp_players.get(mpusername));

 				// Skip players who aren't currently in the dimension that we're using
 				// (which would be weird, since SMP doesn't support Nether properly yet)
 				IntTag playerDim = (IntTag) mpuserData.getTagWithName("Dimension");
 				if (playerDim == null)
 				{
 					if (!world.isOverworld())
 					{
 						continue;
 					}
 				}
 				else
 				{
 					if ((playerDim.value == 0 && !world.isOverworld()) || (playerDim.value != world.getDimension()))
 					{
 						continue;
 					}
 				}

 				// Pull out the data
 				ListTag playerPos = (ListTag) mpuserData.getTagWithName("Pos");
 				ListTag playerRotation = (ListTag) mpuserData.getTagWithName("Rotation");
 				DoubleTag posX = (DoubleTag) playerPos.value.get(0);
 				DoubleTag posY = (DoubleTag) playerPos.value.get(1);
 				DoubleTag posZ = (DoubleTag) playerPos.value.get(2);
 				FloatTag rotYaw = (FloatTag) playerRotation.value.get(0);
 				FloatTag rotPitch = (FloatTag) playerRotation.value.get(1);
 				this.playerPositions.add(new CameraPreset(this.playerPositions.size(),
 						mpusername, new Block((int) -posX.value, (int) -posY.value-1, (int) -posZ.value+1),
 						rotYaw.value, rotPitch.value));
 			}
 			catch (Exception e)
 			{
 				// Just report to console and continue.
 				XRay.logger.warn("Error loading position information for user " + mpusername + ": " + e.toString());
 			}
 		}

 		// Set the spawn point if we're not in the Nether
 		this.spawnPoint_idx = this.playerPositions.size();
 		if (world.isOverworld())
 		{
 			IntTag spawnX = (IntTag) levelDataData.getTagWithName("SpawnX");
 			IntTag spawnY = (IntTag) levelDataData.getTagWithName("SpawnY");
 			IntTag spawnZ = (IntTag) levelDataData.getTagWithName("SpawnZ");
 			this.playerPositions.add(new CameraPreset(this.spawnPoint_idx, "Spawnpoint", new Block(-spawnX.value, -spawnY.value-1, -spawnZ.value+1), 0, 0));
 		}
 		else
 		{
 			this.playerPositions.add(new CameraPreset(this.spawnPoint_idx, "Map Center", new Block(0,-66,0), 0, 0));
 		}

 		// Figure out where to set the "player" position, if we have no singleplayer user
 		if (this.playerPos_idx == -1)
 		{
 			this.playerPos_idx = this.spawnPoint_idx;
 		}

 		// Figure out what kind of data we'll be reading.  It turns out that Minecraft
 		// will convert worlds all at once before loading, rather than doing it on-the-fly
 		// as was previously thought, so technically we can be a little more strict here
 		// if we want, but I'll support hybrids just for obscure corner cases where
 		// someone might have been playing around with conversions.
 		IntTag versionTag = (IntTag) levelDataData.getTagWithName("version");
 		StringTag levelNameTag = (StringTag) levelDataData.getTagWithName("LevelName");
 		if (versionTag != null && levelNameTag != null)
 		{
 			// Technically we should probably check for the magic version number "19132" here,
 			// but since it's a brand-new tag, we're just checking for its presence.
 			world.is_beta_1_3_level = true;
 			world.has_region_data = true;
 			this.levelName = levelNameTag.value;
 		}
 		else
 		{
 			File regionDir = new File(world.getBasePath(), "region");
 			if (regionDir.exists() && regionDir.isDirectory())
 			{
 				File[] mcrFiles = regionDir.listFiles(new RegionFileFilter());
 				if (mcrFiles.length > 0)
 				{
 					world.has_region_data = true;
 				}
 			}
 			this.levelName = null;
 		}

 		// Pull our random seed
 		this.randomSeed = ((LongTag) levelDataData.getTagWithName("RandomSeed")).value;
 	}

 	/**
 	 * Sets the random seed.
 	 */
 	public void setRandomSeed(long randomSeed)
 	{
 		this.randomSeed = randomSeed;
 	}

 	/**
 	 * Returns the random seed.
 	 */
 	public long getRandomSeed()
 	{
 		return this.randomSeed;
 	}

 	/***
 	 * returns the spawning point for this level
 	 */
 	public CameraPreset getPlayerPositionIdx(int idx)
 	{
 		return this.playerPositions.get(idx);
 	}

 	public CameraPreset getSpawnPoint() {
 		return this.getPlayerPositionIdx(this.spawnPoint_idx);
 	}

 	public CameraPreset getPlayerPosition() {
 		return this.getPlayerPositionIdx(this.playerPos_idx);
 	}

 	public CameraPreset getNextPlayerPosition(CameraPreset current) {
 		int next_idx = (current.idx+1) % this.playerPositions.size();
 		return this.getPlayerPositionIdx(next_idx);
 	}

 	public CameraPreset getPrevPlayerPosition(CameraPreset current) {
 		int prev_idx = current.idx - 1;
 		if (prev_idx < 0)
 		{
 			prev_idx = this.playerPositions.size()-1;
 		}
 		return this.getPlayerPositionIdx(prev_idx);
 	}

 	/***
 	 * correctly calculate the chunk X value given a universal coordinate
 	 * @param x
 	 * @return
 	 */
 	public static int getChunkX(int x) {
 		if(x<0) {
 			return  -(((-x)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
 		} else {
 			return x / 16;
 		}
 	}

 	/***
 	 * correctly calculate the block X value given a universal coordinate
 	 * @param x
 	 * @return
 	 */
 	public static int getBlockX(int x) {
 		if(x<0) {
 			return 15-(((-x)-1) % 16); // compensate for different chunk calculation
 		} else {
 			return x % 16;
 		}
 	}

 	/***
 	 * correctly calculate the chunk Z value given a universal coordinate
 	 * @param z
 	 * @return
 	 */
 	public static int getChunkZ(int z) {
 		if(z<0) {
 			return  -(((-z)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
 		} else {
 			return z / 16;
 		}
 	}

 	/***
 	 * correctly calculate the block Z value given a universal coordinate
 	 * @param z
 	 * @return
 	 */
 	public static int getBlockZ(int z) {
 		if(z<0) {
 			return 15-(((-z)-1) % 16); // compensate for different chunk calculation
 		} else {
 			return z % 16;
 		}
 	}

 	/***
 	 * Returns a single byte representing the block data at the given universal coordinates
 	 * @param x
 	 * @param z
 	 * @param y
 	 * @return
 	 */
 	public short getBlockData(int x, int z, int y) {
 		int chunkX = getChunkX(x);
 		int chunkZ = getChunkZ(z);

 		int blockX = getBlockX(x);
 		int blockZ = getBlockZ(z);

 		Chunk chunk = this.getChunk(chunkX, chunkZ);
 		if(chunk == null) { // no chunk for the given coordinate
 			return 0;
 		}
 		int blockOffset = y + (blockZ * 128) + (blockX * 128 * 16);

 		try {
 			return chunk.getMapData().value[blockOffset];
 		} catch(Exception e) {
 			// dirty, but there was an error with out of range blockvalues O_o
 			XRay.logger.fatal(blockOffset);
 			XRay.logger.fatal("" + x + ", " + y + ", " + z);
 			XRay.logger.fatal("" + blockX + ", " + blockZ );
 			System.exit(0);
 			return 0;
 		}
 	}


 	public void invalidateSelected() {
 		this.invalidateSelected(false);
 	}

 	public void invalidateSelected(boolean main_dirty) {
 		for (Chunk[] chunkrow : this.levelData)
 		{
 			for (Chunk chunk : chunkrow)
 			{
 				if (chunk != null)
 				{
 					chunk.setSelectedDirty();
 					if (main_dirty)
 					{
 						chunk.setDirty();
 					}
 				}
 			}
 		}
 	}

 	public void markChunkAsDirty(int x, int z) {
 		Chunk c = this.getChunk(x, z);
 		if (c != null)
 		{
 			c.setDirty();
 		}
 	}

 	/**
 	 * Loads a chunk given the chunk's x and z coordinates (not world coordinates)
 	 *
 	 * @param chunkX The Chunk X coordinate
 	 * @param chunkZ The Chunk Z coordinate
 	 */
 	public Tag loadChunk(int chunkX, int chunkZ) {
 		DataInputStream chunkInputStream = MinecraftEnvironment.getChunkInputStream(world, chunkX, chunkZ);
 		if(chunkInputStream == null) {
 			return null;
 		}
 		try
 		{
 			Tag t = DTFReader.readTagData(chunkInputStream);
 			if (t != null)
 			{
 				levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = new Chunk(this, t);
 			}
 			return t;
 		}
 		catch (IOException e)
 		{
 			return null;
 		}
 	}

 	/**
 	 * Gets the specified Chunk object
 	 *
 	 * @param chunkX
 	 * @param chunkZ
 	 * @return
 	 */
 	public Chunk getChunk(int chunkX, int chunkZ) {
 		return this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE];
 	}

 	/**
 	 * Sets a chunk to null
 	 *
 	 * @param chunkX
 	 * @param chunkZ
 	 */
 	public void clearChunk(int chunkX, int chunkZ)
 	{
 		this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = null;
 	}

 	/**
 	 * Sets all chunks in the given X row to be no longer on the minimap
 	 *
 	 * @param chunkX
 	 */
 	public ArrayList<Chunk> removeChunkRowXFromMinimap(int chunkX)
 	{
 		ArrayList<Chunk> chunks = new ArrayList<Chunk>();
 		int xval = (chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE;
 		for (int i=0; i<LEVELDATA_SIZE; i++)
 		{
 			if (this.levelData[xval][i] != null && this.levelData[xval][i].isOnMinimap)
 			{
 				//XRay.logger.trace("(" + chunkX + ") Removing from minimap on " + xval + ", " + i);
 				this.levelData[xval][i].isOnMinimap = false;
 				chunks.add(this.levelData[xval][i]);
 			}
 		}
 		return chunks;
 	}

 	/**
 	 * Sets all chunks in the given Z row to be no longer on the minimap
 	 *
 	 * @param chunkZ
 	 */
 	public ArrayList<Chunk> removeChunkRowZFromMinimap(int chunkZ)
 	{
 		ArrayList<Chunk> chunks = new ArrayList<Chunk>();
 		int zval = (chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE;
 		for (int i=0; i<LEVELDATA_SIZE; i++)
 		{
 			if (this.levelData[i][zval] != null && this.levelData[i][zval].isOnMinimap)
 			{
 				//XRay.logger.trace("Removing from minimap on " + i + ", " + zval);
 				this.levelData[i][zval].isOnMinimap = false;
 				chunks.add(this.levelData[i][zval]);
 			}
 		}
 		return chunks;
 	}

 	/**
 	 * Sets all chunks to be no longer on the minimap
 	 * @return
 	 */
 	public ArrayList<Chunk> removeAllChunksFromMinimap()
 	{
 		ArrayList<Chunk> chunks = new ArrayList<Chunk>();
 		for (int z=0; z<LEVELDATA_SIZE; z++)
 		{
 			for (int x=0; x<LEVELDATA_SIZE; x++)
 			{
 				if (this.levelData[x][z] != null && this.levelData[x][z].isOnMinimap)
 				{
 					//XRay.logger.trace("(" + chunkX + ") Removing from minimap on " + xval + ", " + i);
 					this.levelData[x][z].isOnMinimap = false;
 					chunks.add(this.levelData[x][z]);
 				}
 			}
 		}
 		return chunks;
 	}

 	/***
 	 * gets the data for a given chunk (coordinates are CHUNK coordinates, not world coordinates!)
 	 * @param chunkX
 	 * @param chunkZ
 	 * @return
 	 */
 	public short[] getChunkData(int chunkX, int chunkZ) {
 		Chunk c = this.getChunk(chunkX, chunkZ);
 		if(c == null) {
 			return new short[32768];
 		} else {
 			return c.getMapData().value;
 		}
 	}


 	public Tag getFullChunk(int chunkX, int chunkZ) {
 		Chunk c = this.getChunk(chunkX, chunkZ);
 		if(c == null) {
 			return null;
 		}
 		return c.getChunkData();
 	}
 }
	/**
	* Copyright (c) 2010-2011, Vincent Vollers and Christopher J. Kucera
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* * Neither the name of the Minecraft X-Ray team nor the
	* names of its contributors may be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL VINCENT VOLLERS OR CJ KUCERA BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package com.apocalyptech.minecraft.xray;

	import java.io.File;
	import java.io.DataInputStream;
	import java.io.IOException;
	import java.util.ArrayList;

	import com.apocalyptech.minecraft.xray.dtf.CompoundTag;
	import com.apocalyptech.minecraft.xray.dtf.DTFReader;
	import com.apocalyptech.minecraft.xray.dtf.DoubleTag;
	import com.apocalyptech.minecraft.xray.dtf.FloatTag;
	import com.apocalyptech.minecraft.xray.dtf.IntTag;
	import com.apocalyptech.minecraft.xray.dtf.ListTag;
	import com.apocalyptech.minecraft.xray.dtf.StringTag;
	import com.apocalyptech.minecraft.xray.dtf.LongTag;
	import com.apocalyptech.minecraft.xray.dtf.Tag;

	/***
	* A Minecraft level
	* @author Vincent
	*/
	public class MinecraftLevel {

	//public static int LEVELDATA_SIZE = 256;
	public static int LEVELDATA_SIZE = 128;
	public static int LEVELDATA_OFFSET = Integer.MAX_VALUE/2;
	public Chunk[][] levelData;

	private WorldInfo world;

	// This var holds the index of the player position we've most recently picked
	private ArrayList<CameraPreset> playerPositions;
	private int playerPos_idx;
	private int spawnPoint_idx;
	private long randomSeed;
	public short[] HIGHLIGHT_ORES;

	public ArrayList<Texture> minecraftTextures;
	public Texture paintingTexture;

	public String levelName;

	/**
	* Given a WorldInfo object, return its user-defined name. There's
	* some duplication here from the constructor object, but I think that's
	* okay for this case.
	*/
	public static String getLevelName(WorldInfo world)
	{
	File levelFile = world.getLevelDatFile();
	CompoundTag levelData = (CompoundTag) DTFReader.readDTFFile(levelFile);
	CompoundTag levelDataData = (CompoundTag) levelData.getTagWithName("Data");
	StringTag levelNameTag = (StringTag) levelDataData.getTagWithName("LevelName");
	if (levelNameTag != null)
	{
	return levelNameTag.value;
	}
	else
	{
	return null;
	}
	}

	/***
	* Create a minecraftLevel from the given world
	* @param world
	*/
	public MinecraftLevel(WorldInfo world, ArrayList<Texture> minecraftTextures, Texture paintingTexture, short[] HIGHLIGHT_ORES) {
	this.world = world;
	this.minecraftTextures = minecraftTextures;
	this.paintingTexture = paintingTexture;
	this.HIGHLIGHT_ORES = HIGHLIGHT_ORES;

	this.levelData = new Chunk[LEVELDATA_SIZE][LEVELDATA_SIZE];

	File levelFile = world.getLevelDatFile();

	CompoundTag levelData = (CompoundTag) DTFReader.readDTFFile(levelFile);

	// XRay.logger.trace(levelData.toString());

	this.playerPositions = new ArrayList<CameraPreset>();
	this.playerPos_idx = -1;
	this.spawnPoint_idx = -1;

	CompoundTag levelDataData = (CompoundTag) levelData.getTagWithName("Data");
	CompoundTag levelPlayerData = (CompoundTag) levelDataData.getTagWithName("Player");
	if(levelPlayerData != null) {

	// Figure out what dimension the player's in. If it matches, move our camera there.
	IntTag playerDim = (IntTag) levelPlayerData.getTagWithName("Dimension");
	if ((playerDim == null && world.isOverworld()) \|\| (playerDim != null && ((playerDim.value == 0 && world.isOverworld()) \|\| (playerDim.value == world.getDimension()))))
	{
	ListTag playerPos = (ListTag) levelPlayerData .getTagWithName("Pos");
	ListTag playerRotation = (ListTag) levelPlayerData .getTagWithName("Rotation");

	DoubleTag posX = (DoubleTag) playerPos.value.get(0);
	DoubleTag posY = (DoubleTag) playerPos.value.get(1);
	DoubleTag posZ = (DoubleTag) playerPos.value.get(2);

	FloatTag rotYaw = (FloatTag) playerRotation.value.get(0);
	FloatTag rotPitch = (FloatTag) playerRotation.value.get(1);

	this.playerPositions.add(new CameraPreset(0, "Singleplayer User", new Block((int) -posX.value, (int) -posY.value, (int) -posZ.value+1),
	rotYaw.value, rotPitch.value));
	this.playerPos_idx = 0;
	}
	}

	// Get a list of MP users that can provide valid camera positions for us
	CompoundTag mpuserData;
	for (String mpusername : world.mp_players.keySet())
	{
	try
	{
	mpuserData = (CompoundTag) DTFReader.readDTFFile(world.mp_players.get(mpusername));

	// Skip players who aren't currently in the dimension that we're using
	// (which would be weird, since SMP doesn't support Nether properly yet)
	IntTag playerDim = (IntTag) mpuserData.getTagWithName("Dimension");
	if (playerDim == null)
	{
	if (!world.isOverworld())
	{
	continue;
	}
	}
	else
	{
	if ((playerDim.value == 0 && !world.isOverworld()) \|\| (playerDim.value != world.getDimension()))
	{
	continue;
	}
	}

	// Pull out the data
	ListTag playerPos = (ListTag) mpuserData.getTagWithName("Pos");
	ListTag playerRotation = (ListTag) mpuserData.getTagWithName("Rotation");
	DoubleTag posX = (DoubleTag) playerPos.value.get(0);
	DoubleTag posY = (DoubleTag) playerPos.value.get(1);
	DoubleTag posZ = (DoubleTag) playerPos.value.get(2);
	FloatTag rotYaw = (FloatTag) playerRotation.value.get(0);
	FloatTag rotPitch = (FloatTag) playerRotation.value.get(1);
	this.playerPositions.add(new CameraPreset(this.playerPositions.size(),
	mpusername, new Block((int) -posX.value, (int) -posY.value-1, (int) -posZ.value+1),
	rotYaw.value, rotPitch.value));
	}
	catch (Exception e)
	{
	// Just report to console and continue.
	XRay.logger.warn("Error loading position information for user " + mpusername + ": " + e.toString());
	}
	}

	// Set the spawn point if we're not in the Nether
	this.spawnPoint_idx = this.playerPositions.size();
	if (world.isOverworld())
	{
	IntTag spawnX = (IntTag) levelDataData.getTagWithName("SpawnX");
	IntTag spawnY = (IntTag) levelDataData.getTagWithName("SpawnY");
	IntTag spawnZ = (IntTag) levelDataData.getTagWithName("SpawnZ");
	this.playerPositions.add(new CameraPreset(this.spawnPoint_idx, "Spawnpoint", new Block(-spawnX.value, -spawnY.value-1, -spawnZ.value+1), 0, 0));
	}
	else
	{
	this.playerPositions.add(new CameraPreset(this.spawnPoint_idx, "Map Center", new Block(0,-66,0), 0, 0));
	}

	// Figure out where to set the "player" position, if we have no singleplayer user
	if (this.playerPos_idx == -1)
	{
	this.playerPos_idx = this.spawnPoint_idx;
	}

	// Figure out what kind of data we'll be reading. It turns out that Minecraft
	// will convert worlds all at once before loading, rather than doing it on-the-fly
	// as was previously thought, so technically we can be a little more strict here
	// if we want, but I'll support hybrids just for obscure corner cases where
	// someone might have been playing around with conversions.
	IntTag versionTag = (IntTag) levelDataData.getTagWithName("version");
	StringTag levelNameTag = (StringTag) levelDataData.getTagWithName("LevelName");
	if (versionTag != null && levelNameTag != null)
	{
	// Technically we should probably check for the magic version number "19132" here,
	// but since it's a brand-new tag, we're just checking for its presence.
	world.is_beta_1_3_level = true;
	world.has_region_data = true;
	this.levelName = levelNameTag.value;
	}
	else
	{
	File regionDir = new File(world.getBasePath(), "region");
	if (regionDir.exists() && regionDir.isDirectory())
	{
	File[] mcrFiles = regionDir.listFiles(new RegionFileFilter());
	if (mcrFiles.length > 0)
	{
	world.has_region_data = true;
	}
	}
	this.levelName = null;
	}

	// Pull our random seed
	this.randomSeed = ((LongTag) levelDataData.getTagWithName("RandomSeed")).value;
	}

	/**
	* Sets the random seed.
	*/
	public void setRandomSeed(long randomSeed)
	{
	this.randomSeed = randomSeed;
	}

	/**
	* Returns the random seed.
	*/
	public long getRandomSeed()
	{
	return this.randomSeed;
	}

	/***
	* returns the spawning point for this level
	*/
	public CameraPreset getPlayerPositionIdx(int idx)
	{
	return this.playerPositions.get(idx);
	}

	public CameraPreset getSpawnPoint() {
	return this.getPlayerPositionIdx(this.spawnPoint_idx);
	}

	public CameraPreset getPlayerPosition() {
	return this.getPlayerPositionIdx(this.playerPos_idx);
	}

	public CameraPreset getNextPlayerPosition(CameraPreset current) {
	int next_idx = (current.idx+1) % this.playerPositions.size();
	return this.getPlayerPositionIdx(next_idx);
	}

	public CameraPreset getPrevPlayerPosition(CameraPreset current) {
	int prev_idx = current.idx - 1;
	if (prev_idx < 0)
	{
	prev_idx = this.playerPositions.size()-1;
	}
	return this.getPlayerPositionIdx(prev_idx);
	}

	/***
	* correctly calculate the chunk X value given a universal coordinate
	* @param x
	* @return
	*/
	public static int getChunkX(int x) {
	if(x<0) {
	return -(((-x)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
	} else {
	return x / 16;
	}
	}

	/***
	* correctly calculate the block X value given a universal coordinate
	* @param x
	* @return
	*/
	public static int getBlockX(int x) {
	if(x<0) {
	return 15-(((-x)-1) % 16); // compensate for different chunk calculation
	} else {
	return x % 16;
	}
	}

	/***
	* correctly calculate the chunk Z value given a universal coordinate
	* @param z
	* @return
	*/
	public static int getChunkZ(int z) {
	if(z<0) {
	return -(((-z)-1) / 16)-1; // otherwise -1 and +1 would return the same chunk
	} else {
	return z / 16;
	}
	}

	/***
	* correctly calculate the block Z value given a universal coordinate
	* @param z
	* @return
	*/
	public static int getBlockZ(int z) {
	if(z<0) {
	return 15-(((-z)-1) % 16); // compensate for different chunk calculation
	} else {
	return z % 16;
	}
	}

	/***
	* Returns a single byte representing the block data at the given universal coordinates
	* @param x
	* @param z
	* @param y
	* @return
	*/
	public short getBlockData(int x, int z, int y) {
	int chunkX = getChunkX(x);
	int chunkZ = getChunkZ(z);

	int blockX = getBlockX(x);
	int blockZ = getBlockZ(z);

	Chunk chunk = this.getChunk(chunkX, chunkZ);
	if(chunk == null) { // no chunk for the given coordinate
	return 0;
	}
	int blockOffset = y + (blockZ * 128) + (blockX * 128 * 16);

	try {
	return chunk.getMapData().value[blockOffset];
	} catch(Exception e) {
	// dirty, but there was an error with out of range blockvalues O_o
	XRay.logger.fatal(blockOffset);
	XRay.logger.fatal("" + x + ", " + y + ", " + z);
	XRay.logger.fatal("" + blockX + ", " + blockZ );
	System.exit(0);
	return 0;
	}
	}


	public void invalidateSelected() {
	this.invalidateSelected(false);
	}

	public void invalidateSelected(boolean main_dirty) {
	for (Chunk[] chunkrow : this.levelData)
	{
	for (Chunk chunk : chunkrow)
	{
	if (chunk != null)
	{
	chunk.setSelectedDirty();
	if (main_dirty)
	{
	chunk.setDirty();
	}
	}
	}
	}
	}

	public void markChunkAsDirty(int x, int z) {
	Chunk c = this.getChunk(x, z);
	if (c != null)
	{
	c.setDirty();
	}
	}

	/**
	* Loads a chunk given the chunk's x and z coordinates (not world coordinates)
	*
	* @param chunkX The Chunk X coordinate
	* @param chunkZ The Chunk Z coordinate
	*/
	public Tag loadChunk(int chunkX, int chunkZ) {
	DataInputStream chunkInputStream = MinecraftEnvironment.getChunkInputStream(world, chunkX, chunkZ);
	if(chunkInputStream == null) {
	return null;
	}
	try
	{
	Tag t = DTFReader.readTagData(chunkInputStream);
	if (t != null)
	{
	levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = new Chunk(this, t);
	}
	return t;
	}
	catch (IOException e)
	{
	return null;
	}
	}

	/**
	* Gets the specified Chunk object
	*
	* @param chunkX
	* @param chunkZ
	* @return
	*/
	public Chunk getChunk(int chunkX, int chunkZ) {
	return this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE];
	}

	/**
	* Sets a chunk to null
	*
	* @param chunkX
	* @param chunkZ
	*/
	public void clearChunk(int chunkX, int chunkZ)
	{
	this.levelData[(chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE][(chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE] = null;
	}

	/**
	* Sets all chunks in the given X row to be no longer on the minimap
	*
	* @param chunkX
	*/
	public ArrayList<Chunk> removeChunkRowXFromMinimap(int chunkX)
	{
	ArrayList<Chunk> chunks = new ArrayList<Chunk>();
	int xval = (chunkX+LEVELDATA_OFFSET)%LEVELDATA_SIZE;
	for (int i=0; i<LEVELDATA_SIZE; i++)
	{
	if (this.levelData[xval][i] != null && this.levelData[xval][i].isOnMinimap)
	{
	//XRay.logger.trace("(" + chunkX + ") Removing from minimap on " + xval + ", " + i);
	this.levelData[xval][i].isOnMinimap = false;
	chunks.add(this.levelData[xval][i]);
	}
	}
	return chunks;
	}

	/**
	* Sets all chunks in the given Z row to be no longer on the minimap
	*
	* @param chunkZ
	*/
	public ArrayList<Chunk> removeChunkRowZFromMinimap(int chunkZ)
	{
	ArrayList<Chunk> chunks = new ArrayList<Chunk>();
	int zval = (chunkZ+LEVELDATA_OFFSET)%LEVELDATA_SIZE;
	for (int i=0; i<LEVELDATA_SIZE; i++)
	{
	if (this.levelData[i][zval] != null && this.levelData[i][zval].isOnMinimap)
	{
	//XRay.logger.trace("Removing from minimap on " + i + ", " + zval);
	this.levelData[i][zval].isOnMinimap = false;
	chunks.add(this.levelData[i][zval]);
	}
	}
	return chunks;
	}

	/**
	* Sets all chunks to be no longer on the minimap
	* @return
	*/
	public ArrayList<Chunk> removeAllChunksFromMinimap()
	{
	ArrayList<Chunk> chunks = new ArrayList<Chunk>();
	for (int z=0; z<LEVELDATA_SIZE; z++)
	{
	for (int x=0; x<LEVELDATA_SIZE; x++)
	{
	if (this.levelData[x][z] != null && this.levelData[x][z].isOnMinimap)
	{
	//XRay.logger.trace("(" + chunkX + ") Removing from minimap on " + xval + ", " + i);
	this.levelData[x][z].isOnMinimap = false;
	chunks.add(this.levelData[x][z]);
	}
	}
	}
	return chunks;
	}

	/***
	* gets the data for a given chunk (coordinates are CHUNK coordinates, not world coordinates!)
	* @param chunkX
	* @param chunkZ
	* @return
	*/
	public short[] getChunkData(int chunkX, int chunkZ) {
	Chunk c = this.getChunk(chunkX, chunkZ);
	if(c == null) {
	return new short[32768];
	} else {
	return c.getMapData().value;
	}
	}


	public Tag getFullChunk(int chunkX, int chunkZ) {
	Chunk c = this.getChunk(chunkX, chunkZ);
	if(c == null) {
	return null;
	}
	return c.getChunkData();
	}
	}