Move the turtle forward by the given number of units. If the pen is down, draw a line with the configured color.
Put the pen up or down.
Change the turtle orientation by the given number of degrees.
Current turtle color.
Current turtle orientation (in degrees). Initially, the turtle is facing upwards.
Is the pen currently down?
How many pixels is one unit (as used by forward).
View to draw on. This will usually be a reference.
Current turtle coordinates.