FuncD
Copyright VelocityApps, Inc. 2011
January 9th, 2011

FuncD, Functional Drawing, is a programming language that was made to be a modern approach to the LOGO language.

(The original specification for FuncD was considered and written in August, and can be found here (out of date): http://pastie.org/1123593).

I chose to write FuncD in Python as a introductory project for myself, and threw the groundwork together over a Saturday afternoon.

Looking at the source, you can see that there are 4 main components:
	- FuncDriver: The program that you run to select options.
	- FuncDInterpreter: The program that parsing scripts as well as single commands.
	- GraphicsController: A class that handles drawing and controls the pygame window.
	- FuncData: A class that holds the default function definitions and contains functions parsed from scripts.

~~ How to use FuncD ~~
1. Install the pygame module
2. Run FuncDriver.py
	Arguments, choose one:
		- i, run the interpreter
		- t, display parse times
3. Choose an option:
	- load <file> (must be complete path, or in same directory)
	- fdi, starts the interpreter

4. After running a file, you can enter single commands through the FDI >> prompt

~~ How to write scripts ~~
There are currently only a few functions supported that provide the building blocks for your programs. Hopefully with support from the community, more will be added. The current functions (as defined in FuncData):

	- move > # (move # distance in current direction)
	- moved > dir > # (move in a direction such as up, down, left, or right for # distance)
	- penUp (draws while moving)
	- penDown (does not draw while moving)
	- random (turns a random amount)
	- randomd > # (turns a random amount and moves #)

Fucntions to be added would be setting the color, setting the direction, setting the size of the pygame window/background color, making arcs, etc.

To write scripts, save your file as .fd and follow these rules:
1. Define new blocks with the format, "new <name>:\n"
2. Add commands seperated by line breaks, such as:
	move > 20 (moves 20 forward)
	2[turn > 90] (turns +90 degrees, twice)
	move > 120 (moves 120 forward)
	; // Finish the block with a semi-colon
3. Call other functions defined (anywhere) in the script from any other function, or from the FDI prompt (after a file has been read in successfully):
	blockName (calls blockName once)
	10[blockName] (calls blockName 10 times)
4. ????
5. Profit

An example program is included, ex.fd

Hopefully support will be added for defining arguments to your own functions, calling multiple commands within a loop block, and adding more default functions.

FuncD is currently licensed under the GPL.