This is the readme that goes with the logo class
from Rene Kluwen <email@example.com>.
This class is an implementation of a Logo interpreter
(parser and graphical output).
The whole thing consists of one single PHP class.
License: LGPL. See: http://www.gnu.org/copyleft/lesser.html.
Parsing is mostly done using regular expressions.
Arithmetic functionality is 'borrowed' from PHP, using
the eval() function.
Output needs SWF support in your PHP version.
** The basic Logo commands:
** FD 100 Move the turtle forward 100 steps.
** RT 90 Turn the turtle to the right 90º.
** LT 90 Turn the turtle to the left 90º.
** BK 100 Move the turtle backwards 100 steps.
** PU Pick the turtle's pen up off the paper.
** PD Put the turtles pen back down on the paper.
** CS Clear the screen and start over.
** HT Hide the turtle (triangle).
** ST Show the turtle (triangle).
** REPEAT 3 [...] Repeat the commands 3 times.
** MAKE "var value Set variabele var to value
** TO wordname :par1 :par2 ... Wordname is a new word with par1, par2... as parameters
Todo: implement some music commands.
Todo: Conditional execution (IF), Local variables, more commands
(such as POLY, SETXY, etc.).