You can read about the project at https://kidslovetocode.wordpress.com/2016/09/27/using-scratch-with-minecraft-scriptcraft-step-by-step-instructions/ or you can follow the instructions below to try it yourselves.
You have to download BuildTools.jar from https://hub.spigotmc.org/jenkins/job/BuildTools/ and the to follow the instructions from https://www.spigotmc.org/wiki/buildtools/. Basically you will run this command (not double click on the downloaded file)
java -jar BuildTools.jar
and after a while you will find in the same folder craftbukkit-1.xx.jar and spigot-1.xx.jar. When writing this, the most recent version was 1.10, so I used the file spigot-1.10.jar.
The next steps are described at https://www.spigotmc.org/wiki/spigot-installation/. Follow them and make sure the server works.
Download scriptcraft.jar from http://scriptcraftjs.org/download/latest/ and copy it in the Minecraft server \plugins subfolder. Restart the server and you will see something similar to this in the output console:
[14:04:25 INFO]: [scriptcraft] Enabling scriptcraft v3.1.12-2015-12-30
Scriptcraft will create its own folder structure under the Minecraft server main folder.
Download the pre-built installer for your OS from https://nodejs.org/en/download/, launch it and follow the on-screen instructions.
Download it from https://scratch.mit.edu/scratch2download/ (start by installing Adobe Air if it isn't already installed on your computer)
Install the PC/Mac version from https://minecraft.net/en/download/. You must have a paid account in order to use it.
Following the installation instructions for MC server you should have created a script or a batch file (depending on the OS) containing a line similar to this (I didn't use the other parameters):
java -Xms512M -Xmx1G -jar spigot.jar
Instead of using this script to launch the server, you must download mc.js file and copy it in the same folder, taking care to modify it according to your previous parameters for spawning the new java process. You invoke this file by typing
>node mc.js
It will launch Minecraft server as a child process and will listen to ports 8088 and 8089. On port 8088 it receives commands and poll requests from Scratch and on port 8089 it receives information from MC server - current block values and result of some operations. You can leave the ports unchanged, or you can choose other values, but you will need to also update the following two files.
In the Scriptcraft plugins folder you have to copy the file scratch.js which interprets commands passed by the Node.js script.
It keeps track of IPs for each client so you can have multiple connections from different computers. You can leave 127.0.0.1 for scratchReturnAddress as the processes run on the same machine, and the port must be the same as the second one from mc.js (8089).
On the client you will have to use MCextension.json file for Scratch. The port must be the same as the first port defined in mc.js (8088), but you need to update the IP address to match the server's address if you are using a separate computer. You should also update the default player, replacing playerName with the one you will use most frequently.
Pressing Shift and clicking File in Scratch will provide access to Import experimental HTTP extension (the last option in the list) for opening the MCextension.json file.
By doing this, in the More blocks category you will have access to new blocks and variables. Before issuing any other command you should use Connect User and the name of a player with an open MC session on the server as a parameter. When connected, it will post a message in Minecraft chat and will automatically create a drone at player's position, which will execute all the commands.
The new blocks defined in MCextension.json file try to replicate some of the functions that Walter Higgins defined in the drone plugin. For short descriptions of those functions and needed parameters please check https://github.com/walterhiggins/ScriptCraft/blob/master/docs/API-Reference.md#drone-plugin.
The box, prism, cylinder and rainbow are used to create solid structures, while box0, prism0 and cylinder0 are for hollow structures - just walls without ceiling and floor. You can specify the material - block type and block data - and the dimensions. Stairs, bed, torch and wallsign are used to place specific elements which must take into account player's orientation. The move drone function tells the drone where to move. The last drone position will be remembered so if you want to start again from the player's position, you have to use move drone reset or Connect user again. Summon is used to spawn the mobs from the predefined list. You can update this list for new mobs.
At the end of the file there are some variables updated by the Minecraft server: blockType and blockData contain information about the block where the drone is, while result contains the result of last executed command. If you want to check the values for blockType and blockData, you should insert a delay of at least 0.2 secs (using standard Scratch block) after the last move drone instruction before using them.
Sometimes commands are not executed in order, especially when the server is busy. It's better to avoid launching command sequences from more than one computer at the same time, although it could work.
Hunting for bugs, adding new functions, showing the equivalent Javascript commands on screen.
Walter Higgins for creating Scripcraft, a very powerful tool for Minecraft modding and also for learning Javascript
Dave Locke for the nice explanation of Scratch 2.0 extensions and the initial idea of using MQTT
Kevin Whinnery for explaining (https://www.twilio.com/blog/2014/11/child-processes-streams-minecraft-multiplayer-server-nodejs.html) how to use Node.js to transfer commands received thru http to Minecraft server process
The creators of all other applications used - Minecraft, Scratch and Node.js
-drone created at target block position
-added ‘marker‘ block - useful to show drone position/orientation
-sounds can play for one or all players
-added MC time and weather commands
-turn command sets orientation of player (can track the drone)
-sends to Scratch positions of player and drone
-made the drone visible
Transfer Pixel art from Scratch to Minecraft world (you can find the project in Scratch-Examples)
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