Common Logo Commands

Command What it does Example
CS Clear the screen of the previous drawing!  
setfloodcolor [r g b] Sets the flood color  to the appropriate RGB (Red, Green, Blue) setfloodcolor [ 0 255 255 ]
fill Floods the area with color from the command above  
SetPenSize [n n] Sets the width of the pen to n pixels. You must use two numbers SetPenSize [5 5]
SetPC [r g b] Sets the pen color to the appropriate RGB (Red, Green, Blue) values SetPC [255 0 0] (Gives red)
PE When the pen is moved, it will erase whatever is under it  
FD x Move forward x pixels FD 100
BK x Move Backward x pixels BK 100
LT x Rotate the turtle x degrees left LT 45
RT x Rotate the turtle x degrees right. RT 45
ARC a r Draw an arc ARC 45 100
Repeat x [ uses single commands ] Repeats the commands you have used before x times repeat 5  [ fd 100 rt 72 ]
PU Short for "pen up," it lifts the "pen" from the screen  
PD Short for "pen down," it droips the "pen" back to drawing  
     

Let's now look at some Logo calculation commands