factor
length
angle
iterations
axiom
rules
=>
=>
=>
F    : move forward $length units while drawing
X    : move forward $length units without drawing
*    : multiply length with $factor
/    : divide length by $factor
+    : turn left by $angle degrees
-    : turn right by $angle degrees
>    : multiply angle with $factor
<    : divide angle by $factor
!    : increase $factor by 1
?    : decrease $factor by 1
[    : push all states to stack
]    : pop all states from stack
0-8  : line colour, Palette: 
       black, red, green, yellow, blue, magenta, cyan, white, random
y/p/r: yaw, pitch and roll by $angle degrees
Y/P/R: yaw, pitch and roll by -$angle degrees

Drag mouse to rotate L-System