about

An interpreter for the programming language Piet (http://www.dangermouse.net/esoteric/piet.html). Currently only runs the program "hi.png".

build instructions

Run ghc -o piet Main.hs Types.hs.

program manual

Assuming the compiled program is called piet, run ./piet <img_name> -cs <codel_size> on a Unix system or piet.exe <img_name> -cs <codel_size> when you're on Windows. img_name and codel_size respectively represent the name of the image you'd like to execute and the 'pixel size'. That is, a codel is an enlarged pixel by a factor of codel_size. The reason Piet uses codels, and not just pixels, is that otherwise Piet programs would be rather small.

running the example

The codels of hi.png are 16x16, so you should run ./piet hi.png -cs 16 or piet.exe hi.png -cs 16.

hi.png was downloaded from http://www.bertnase.de/npiet/.

licence

You may use this code for whatever purpose it may serve.