from turtle import *

def draw_tile(size):
    "Draws one tile, which can be repeated to form a pattern."
    draw_tile_outline(size)
    draw_design(size)

def draw_tile_outline(size):
    pencolor("#dddddd")
    square(size)

def draw_design(size):
    
    pencolor("blue")
    
    "draw a corner square 1/4 the size of the tile"
    for i in range(4):
        forward (size/4)
        left (90)
        forward (size/4)
        left (90)
        forward (size/4)
        left (90)
        forward (size/4)
        left (90)
        forward (size)
        left (90)
    
    "move to the top of the diamond"
    left (90)
    forward (size*3.5/4)
    penup()
    right(90)
    forward (size/2)
    right(45)
    pendown()
    "draw red diamond"
    pencolor("red")
    forward (size/2)
    right(90)
    forward (size/2)
    right(90)
    forward (size/2)
    right(90)
    forward (size/2)
    penup()
    "reset pen"
    left(45)
    forward (size/2)
    right (180)
    forward(size+size/4+size/8)
    right(90)
    forward (size/2)
    right (180)
    pendown()



def fly(distance):
    "Moves without drawing."
    penup()
    forward(distance)
    pendown()

def square(size):
    "Draws a square of side length `size`"
    for side in range(4):
        forward(size)
        left(90)

def quarter_arc_right(radius):
    "Draws a quarter of an arc, turning to the right."
    circle(-radius, 90)

def quarter_arc_left(radius):
    "Draws a quarter of an arc, turning to the left."
    circle(radius, 90)