Exercise: Represent turtle graphics
There is a cursor (or turtle) in the x-y two-dimensional sphere. It has some (x,y) coordinates. It can go forward n pixels. It can turn left n degrees. It can lift up the pencil or put it down.
There is a cursor (or turtle) in the x-y two-dimensional sphere. It has some (x,y) coordinates. It can go forward n pixels. It can turn left n degrees. It can lift up the pencil or put it down.