minecraft.js/lib/chunk.js

Minecraft data serialization/deserialization and networking

var constants = require(__dirname + '/constants.js'),
    Vector2 = require(__dirname + '/vector2.js'),
    Vector3 = require(__dirname + '/vector3.js'),
    Block = require(__dirname + '/block.js');

/** @constructor */
var Chunk = module.exports = function(x, z) {
    this.blocks = new Buffer(Math.pow(constants.CHUNK_SIZE, 2) * constants.CHUNK_HEIGHT);
    this.heightMap = [];
    this.entities = [];
    this.tileEntities = [];
    this.tileTicks = [];

    this.empty = true;

    this.lastUpdate = 0;
    this.position = new Vector2(x, z);
    this.terrainPopulated = false;

    for(var i = 0; i < 16; i++) {
        this.heightMap[i] = [];
        for(var j = 0; j < 16; j++) {
            this.heightMap[i][j] = 0;
        }
    }
};

Chunk.prototype.forEachBlock = function(userFunction) {
    for(var i = 0; i < constants.CHUNK_SIZE; i++) {
        for(var j = 0; j < constants.CHUNK_SIZE; j++) {
            for(var k = 0; k < constants.CHUNK_HEIGHT; k++) {
                var args = {
                    pos: new Vector3(i, k, j),
                    block: this.get(i, k, j)
                };
                userFunction(args, this);
            }
        }
    }
};

Chunk.prototype.get =
Chunk.prototype.getBlock = function(x, y, z) {
	var blockId = Block.getId(x, y, z);
    return new Block({
    	value: this.blocks.readUInt8(blockId)
    	//TODO: get other values
    });
};

Chunk.prototype.getTop = function(x, z, yStart) {
	for(var i = yStart || (constants.CHUNK_HEIGHT - 1); i >= 0; i++) {
		var block = this.get(x, i, z);
		if(block.value != 0) return block;
   }
};

Chunk.prototype.set =
Chunk.prototype.setBlock = function(x, y, z, value) {
    if(value != undefined) {
    	var blockId = Block.getId(x, y, z);
        this.empty = false;
        
    	this.blocks.writeUInt8(value.value, blockId);
    	//TODO: set other values
   }
};