import tkinter
import turtle

root = tkinter.Tk()   		

c = tkinter.Canvas(root, width=200, height=200)
c.pack()			
c.create_rectangle(0, 0, 200, 200, fill="blue")
ts = turtle.TurtleScreen(c)
ts.bgcolor("blue")
pen = turtle.RawTurtle(ts) 

 
def draw():
    ts.clearscreen() # Gets rid of the turtle
    
    # Move to starting location.
    ts.bgcolor("blue")
    pen.pencolor("blue")
    pen.setheading(180)
    pen.forward(50)
    pen.setheading(90)
    pen.forward(50)
    
    # Draw square
    pen.pencolor("white")
    pen.setheading(0)
    pen.forward(100)
    pen.setheading(270)
    pen.forward(100)
    pen.setheading(180)
    pen.forward(100)
    pen.setheading(90)
    pen.forward(100)
    
    # Return home for next draw.
    pen.pencolor("blue")
    pen.home()
    
def clear():
    ts.clearscreen()
    ts.bgcolor("blue")
    
draw = tkinter.Button(root, text="Draw", command=draw)
clear = tkinter.Button(root, text="Clear", command=clear)

draw.pack()
clear.pack()

tkinter.mainloop()