PHP Online Logo Interpreter

No need to install any software... The Server will interpret the input and get a pretty image for you.

Do you know LOGO? If You Don't, you can visit Wikipedia for a basic knowledge. Logo is fun, i remember when i was a kid, i was first taught the LOGO , i was so addicted to it ... Now, during X-mas 2006, i had the idea of programming a basic interpreter for LOGO and finally i made it.

This interpreter, however, is written in PHP. That means you don't have to download whatever software but just put the code and run it. The result is shown in the following image, which by the way, you can easily save as. Pretty Amazing, Huh? You can do it 2!

Image Output 640x480 (16 Colors) (Need 'IFRRAME')

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Logo Language Input

/* logo sample program 
   4 zlai logo online interpreter v0.1
   note: case - insensitive
   and expressions should not contain spaces ~
*/

#  this is a comment.
;  this is also a comment.
// this is also also a comment.

make "T 220     ; Testing Global Variable

# Spiral
to spiral :size :angle 
  if :size>:T [stop]
  forward :size
  right :angle
  spiral :size+2 :angle
end

# Tree
to tree :size
  if :size<10 [stop]
  fd :size
  lt 30 tree :size*0.7  ;left branch, recursive
  rt 60 tree :size*0.7  ;right branch, recursive
  lt 30 
  bk :size
end

# Entry of Program
window           ; set the window mode
setfc black  ; set flood colour to logo_cyan
fill             ; fill the background
penup            ; pen up
setxy 200 -150   ; set turtle position
pd               ; pen down
setpc white   ; set pen colour to white
spiral 0 91      ; do the work

pu               ; pen up
setpc yellow; set to yellowcolour
setxy -180 -100   ; set the location
lt  degree       ; degree is a global variable
pd               ; pen down
tree 100         ; draw a tree
hideturtle       ; ht = hide the turtle, it is actually a small circle
setpc green      ; last pc command sets the color of text

/*
   enjoy yourself~
   that is all folks, no more time for the improvement now
   however, please tell me bugs or suggestions : admin@zhihua-lai.com
   so i can work on it later if i have time
   it is just for fun!
*/

Instructions

Case In-Sensitive. For Example, make "a 3 is equivant to MaKe "A 3

Empty Spaces are used to separate the code. Write :X+:Y Rather than :X(SPACE)+(SPACE):Y

V0.1 Supports ...

    var $_keywords_args=array(
             "FORWARD","FD",
             "BACK","BK",
             "RIGHT","RT",
             "LEFT","LT",
             "SETPC","SETPENCOLOR","SETPENCOLOUR",
             "SETSCREENCOLOR","SETSC","SETSCREENCOLOUR",
             "REPEAT",
             "SETXY","SETPOS",
             "SETX",
             "SETY",
             "TO",
             "ARC",
             "MAKE",
             "LOCALMAKE",
             "LOCAL",
             "IF",
             "SETFC","SETFLOODCOLOR","SETFLOODCOLOUR"
      );
      
      var $_keywords=array(
            "HT","HIDETURTLE",
            "ST","SHOWTURTLE",
            "PU","PENUP",
            "PD","PENDOWN",
            "CS","CLEANSCREEN",
            "HOME",
            "FENCE",
            "WINDOW",
            "WRAP",
            "FILL",
            "END",
            "STOP"
      );

    Constants
    
      "PI"
      "WIDTH"
      "HEIGHT"
      "MAXX"
      "MAXY"
      "MINX"
      "MINY"
      "ISTRUECOLOR"
    	("BLACK",0);
    	("BLUE",1);
    	("GREEN",2);
    	("CYAN",3);
    	("RED",4);
    	("MAGENTA",5);
    	("BROWN",6);
    	("LIGHTGRAY",7);
    	("DARKGRAY",8);
    	("LIGHTGREY",7);
    	("DARKGREY",8);    	
    	("LIGHTBLUE",9);
    	("LIGHTGREEN",10);
    	("LIGHTCYAN",11);
    	("LIGHTRED",12);
    	("LIGHTMAGENTA",13);
    	("YELLOW",14);
    	("WHITE",15);
    	
    	
    Global Variables
    
      "RANDOMNUMBER0_100"
    	"POSX"
    	"POSY"
    	"DEGREE"
      "SCREENCOLOUR"
      "FLOODCOLOUR"
      "PENCOLOUR"
      "SCREENCOLOR"
      "FLOODCOLOR"
      "PENCOLOR"

Dr. Lai, Zhihua | ZLai

PHP Online Logo Interpreter

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