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PiCraft is a Julia package which allows control over the Minecraft World using code. It is compatible with the Minecraft: Pi Edition and the Java Edition with the help of RaspberryJamMod or RaspberryJuice.

Programming in the Minecraft world can be very beneficial in constructing large scale projects which can be automated and this can also be a fun way to introduce programming to children.

Some sample projects available in the documentation are:

• Write scripts to teleport and walk over Water and Lava.
• Construct multi-storey skyscrapers within seconds.
• Draw fractals and shapes using a 3-D turtle.
• Import and export .schematic models without external software.

• The Minecraft: Pi edition is pre-installed on all Rasbian since 2014. Launch it by navigating to Menu > Games or typing minecraft-pi in the terminal. However, if you are running an older version of Raspbian get it here.
• Get the Minecraft: Java edition(MacOS, Linux and Windows) here.

Officially the ability to communicate with the Minecraft world is only available for the Minecraft: Pi edition. To get this to work on the Java edition we need to install a Mod. Detailed instructions can be found here

• "RaspberryJamMod" is a Forge Mod, if you wish to use this along with other Forge mods then this is recommended. Installation instructions are available here.
• "RaspberryJuice" is a Bukkit server plugin, recommended if you wish to work on a Bukkit Minecraft server. Get it here.

Download the appropriate Julia version for your system from here. If you are on a raspberry pi you should follow the instructions given in the documentation here.

]add PiCraft

OR

using Pkg
Pkg.add("https://github.com/JuliaBerry/PiCraft.jl")

Documentation for this package can be accessed at https://juliaberry.github.io/PiCraft.jl/ The documentation consists of a setup instructions, basic tutorials, examples and reference pages.

Load the PiCraft package on the Julia console:

using PiCraft

On load, the library will attempt to connect to a running Minecraft world on localhost. If Minecraft is not running, an error message will be printed. Subsequently, once Minecraft has been started, a connection can be forced by calling connectToWorld().

A 3-D coordinate system is used to describe the Minecraft world. Every position in the Minecraft World can be described with the help of 3 numbers. The X, Y and Z coordinates. These coordinates can be viewed by opening the Debug screen pressing the F3 key.

You can find and set your player's location:

1. Find Player position: getPos()
   • Returns a Tuple{Float64, Float64, Float64} which contains the player's current coordinates.
2. Set Player position: setPos(pos::Tuple{Float64, Float64, Float64})
   • Teleports the player to the specified coordinates.

For example : setPos(getPos() .+ (0, 10, 0)) will teleport you 10m above you current position.

Blocks are the heart of Minecraft. The package provides the ability to modify blocks at specified coordinates. Block is an immutable datatype defined in src/blocks.jl.

struct Block
    id::Int
    data::Int
end

The id defines the type of block (like cobblestone, wool, wood,.etc) and the data attribute defines additional characteristics of the block, on default every block has it data set to 0. For example, Wool's block id is 35, Block(35,0) refers to a block of white wool. Different wool colors can be accessed by changing the data attribute. Red Wool is Block(35, 14), Pink Wool is Block(35,6) and so on. A complete reference can be found here in the documentation.

1. Place Block: setBlock(Tuple{Int, Int, Int}, block::Block)
   • Place the specified Block at the specified coordinates.
2. Place Blocks: setBlocks(p1::Tuple{Real, Real, Real}, p2::Tuple{Real, Real, Real}, block::Block)
   • Set an entire region to the specified block type defined by corners.
3. Get Block information: getBlock(Tuple{Int,Int,Int})
   • Returns the block present at the specified coordinates.

While the getBlock and setBlock functions will accept Float64 as arguments these will be rounded and set to Int as a block cannot be placed on non-integer coordinates.

Contributions, feature requests and bug reports are welcome! If you want to share some of your work or have a query you can post on the #PiCraft channel on julialang's slack (get an invite from https://slackinvite.julialang.org ) or open an issue on the PiCraft github page directly.