Minecraft Pi API: Getting Blocks

by arghbox

2013-08-18 12.13.30
Finding the type of block at a specific location is very useful. With this information you can do a variety of things such as checking to see if the player is flying, finding out whether a door is open or seeing if the player has placed a melon on an alter as an offering to the melon god.

Like the methods that set blocks, the methods that find out what type a block is use co-ordinates to determine which block you are interested in. Each method returns a value or an object for that block. There are three methods that we will look at: getBlock(), getBlockWithData() and getBlocks().

getBlock()

When you want to find the type of any block in the game, the getBlock() method is the one you need to use. It is pretty simple, you provide co-ordinates as arguments and it returns the block type as an integer value.

getBlock(x, y, z)

The following example gets the block type at co-ordinates (12, 0, 16):

import mcpi.minecraft as minecraft
mc = minecraft.Minecraft.create()

x = 12
y = 0
z = 16
blockType = getBlock(x, y, z)

getBlockWithData()

Each block in the game has a number of different states, 16 in total. This allows a single block ID to have a number of different variations. For example the wool block has 16 different states, each one representing a different colour. The TNT block can be smashed like a regular block in state 0 and is explosive in state 1. To see how to set the states check out the section on optional arguments for setBlock() and setBlocks().

Finding out the state of a block with the getBlockWithData() method is relatively simple, yet a tiny bit more complex than the getBlock() method. The getBlockWithData() method takes co-ordinates as arguments in order to determine which block you are interested in. The method returns an object, which contains two attributes, id and data. The id and data attributes store the block type and its state respectively.

getBlockWithData(x, y, z)

The following example finds out the block type and state of the block at co-ordinates (12, 0 ,16):

import mcpi.minecraft as minecraft
mc = minecraft.Minecraft.create()

x = 12
y = 0
z = 16
block = getBlockWithData(x, y, z)

blockType = block.id
blockState = block.data

getBlocks()

The getBlocks() method is supposed to return the values of all the blocks within a cuboid that is defined between two co-ordinates. At the moment the getBlocks() method does not work. I have written a function that achieves the same thing, however it is quite slow and may not be interchangeable with the getBlocks() method if it is ever corrected.

Below is my alternative function. It takes two sets of co-ordinates and returns a 3-dimensional list where x is the first list, y the first nested list and z the second nested list:

def getBlocks(x1, y1, z1, x2, y2, z2):
    xhigh = max(x1, x2)
    xlow = min(x1, x2)
    yhigh = max(y1, y2)
    ylow = min(y1, y2)
    zhigh = max(z1, z2)
    zlow = min(z1, z2)

    blocks = []
    for x in range(xhigh - xlow + 1):
        blocks.append([])
        for y in range(yhigh - ylow + 1):
            blocks[x].append([])
            for z in range(zhigh - zlow + 1):
                blocks[x][y].append([])
                block = mc.getBlock(xlow + x, ylow + y, zlow + z)
                blocks[x][y][z] = block
    return blocks