from turtle import *

# Nelson Mason - LAI 676LEC A - Assignment 1.4 - Checkpoint 3 - Draw with ranges
def draw_tile(size):
    "Draws one tile, which can be repeated to form a pattern."
    draw_tile_outline(size)
    draw_squiggle(size)

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

def draw_squiggle(size): # recoded to draw a circle within each square
    penup()
    forward(size/4)
    left(90)
    forward(size/2)
    pendown() # new starting point for drawing inside the tile
    #forward(size/4) # original starting point for drawing inside the tile 
    pencolor("yellow") # change of color
    #left(90) part of original starting point positioning - moved up in this code block
    quarter_arc_right(size/4) # 1st arc
    #quarter_arc_left(size/4) not needed for right-turn drawing of circle
    #quarter_arc_left(size/4) not needed for right-turn drawing of circle
    quarter_arc_right(size/4) # 2nd arc
    quarter_arc_right(size/4) # 3rd arc - added to keep drawing the circle
    quarter_arc_right(size/4) # 4th arc - added to keep drawing the circle
    left(90) # lines 28-32 moves the pen to the tile outline starting point, 
    fly(size/4) 
    left(90)
    fly(size/2)  
    left(90) # lower left corner, pointing to the right

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)