COMMANDS

• C - Change colour to the next one from the cyclic sequence: black, blue, green, cyan, red, magenta, yellow, and white.

• F - Move forward by one cell and paint the new cell.

• R - Rotate clockwise by 45°.

• [ - Begin a repeatable block and continue executing subsequent code normally.

• ] - Go back to the beginning of the current repeatable block, repeat it once more, and exit the block.  A block bounded by ‘[’ and ‘]’ behaves like a loop that runs twice before the block exits.

EXAMPLES

• [FFF] - Draw a column of 6 white cells.

• CC[[FFF]] - Draw a column of 12 blue cells.

• CCC[[[[[FFF]]R]]] - Draw a green octagon.

MORE

• Visit github.com/susam/cfr for complete information.

• Visit susam.net/cfrs.html for animation effects.