Table of Contents
Advertisement
setpc
setbg
pencolor
(pc)
background (bg)
penup
(pu)
pendown
(pd)
showturtle
(st)
hideturtle
(ht)
home
clearscreen
(cs)
xcor
ycor
heading
turtlestate
(ts)
wrap
window
fence
n
set pen color to N(N = 0,1). (0=white, 1=black).
n
set background color to N(N = 0, 1). (0=white,
1=black).
get current color N of pen(N=0,1). (0=white,
1=black).
get current background color N(N=0, 1). (0=white,
1=black).
put the turtle's pen up. When the turtle moves, it
does not draw a line.
put the turtle's pen down and draws a line when
the turtle moves.(default status)
make the turtle shape visible.(default status)
make the turtle shape invisible.
move the turtle to the center of the screen, points
the turtle straight up (HEADING 0), but does not
clear the graphics screen or alter the pen state.
erase the graphics screen, returns the turtle to the
center of the screen, and sets the turtle's heading
to 0. CLEARSCREEN does not affect the pen state
or screen colors.
output the X coordinate of the turtle.
output the Y coordinate of the turtle.
output the turtle's degree.
output 4 turtle properties:
pen down?
turtle visible?
background color
pen color
make the turtle remain inside the graphics
window no matter how large a movement
command is given. Any time the turtle moves off
the window borders, it wraps around the window
and reappears on the opposite edge.
remove the boundaries from the turtle's field of
movement. If the turtle moves beyond the borders
of the graphics window, it continues to move, but
cannot be seen.
prevent the turtle from moving beyond the edge
of the graphics window. If you try to move the
turtle off the window, it does not move and Logo
displays a message.
28
Advertisement
Table of Contents
