Logo Color Commands





In Logo, the pen color can be modified with the SETPC command followed by a single integer, a text command, or an RBG sequence. The background color can be changed using the SETBG command and the interior of a shape can be changed using the FILL command. Recall that the pen width can be changed using the SETW command with an integer value between 1 and 99.
Command
Result
SETPC 4
This will change the pen color to red.
SETPC “YELLOW
This will change the pen color to yellow. Note there is a space after the setpc command and you must type the double quote symbol.
SETPC [0 255 0]
This will set the pen color to lime green using the RGB values. The three integers indicate the amount of red, green and blue to be mixed.
*Use the color picker (in the toolbox) to find the RGB (red green blue) values.

Basic Color Chart:
0
Black

8
DarkGray
1
Blue

9
LightBlue
2
Green

10
LightGreen
3
Cyan

11
LightCyan
4
Red

12
LightRed
5
Violet

13
Magenta
6
Brown

14
Yellow
7
LightGray

15
White
*There are additional colors that are not listed above.

Change the background color to brown by typing SETBG 6

To color the interior of a shape, you must do the following:
1. Move the turtle to a location inside the shape (I suggest a pen up, move, pen down sequence).
2. Change to the desired color.
3. Type FILL. (You will not see the turtle because it is the same color as the square, so use pen up (PU) and carefully move him out of the square.)

Practice the color commands by typing the following sequences in the listener window.
cs
repeat 4[fd 100 rt 90]
pu
rt 45 fd 10
setpc "red
pd fill
setbg "green
pu
cs pd
setbg 1
setpc 0
setw 10
repeat 6[rt 60 fd 100]
pu
setxy [15 0]
setpc [25 100 150]
pd fill

Refer to the help menu for additional examples and information.