This Scratch 1.4 project draws a pixelated rainbow with a secondary rainbow in Scratch and Minecraft and can control Minecraft Pi on Raspberry Pi. This requires a Raspberry Pi with Rasbian Linux. This system also uses scratchpy and scratch2mcpi from GitHub.com. Possibly this project could also be run against a Bukkit Minecraft server using the RaspberryJuice plugin. Here is a video from Raspberry Pi Model A (a $25 computer) running Minecraft Pi 0.1.1 and Scratch 1.4: http://www.youtube.com/watch?v=LyxO5gANs3I Press a green flag. When connected to Minecraft Pi you can use O/o to say a message in the Minecraft chat and use the arrow-keys to move SWNE (up is South). You can change radius using the slider and click the stage to make a new rainbow with the new radius that is centered where you click. To not clear before drawing, press N/n before or during clicking. To inverse the rainbow, press I/i before or during clicking. If you want it to go faster, set Turbo Mode in Scratch 1.4 by using Edit/Set Single Stepping/Turbo speed and in Scratch 2 by shift-clicking the green flag after you have started it. When I made it I read about rainbows in Wikipedia and discovered the Double Rainbow-meme and YouTube-videos, and decided to also make this program draw a double rainbow by default. I used a technique from a Swedish book: "Mer om BASIC ZX81 – En fortsättningskurs i BASICprogrammering" by Thorbjörn Cruse & Thomas Eriksson (1982). I found this Minecraft Pi Edition API-documentation useful: http://www.stuffaboutcode.com/p/minecraft-api-reference.html
