Exercise 5-24 Rectangular Pattern
import turtle
# Named constants
ANIMATION_SPEED = 0
BASE_X = 0
BASE_Y = 0
def rectangle(x, y, width, height, color):
turtle.setheading(0)
turtle.fillcolor(color) # Set the fill color
turtle.penup() # Raise the pen
turtle.goto(x, y) # Move to the specified location
turtle.pendown() # Lower the pen
# Draw the rectangle.
turtle.begin_fill()
turtle.forward(width)
turtle.left(90)
turtle.forward(height)
turtle.left(90)
turtle.forward(width)
turtle.left(90)
turtle.forward(height)
turtle.end_fill()
def rectangular_pattern(width, height):
# The pattern is made of 3 nested rectangles with
# diagonal lines connecting the corners and the
# four sides.
# Draw the outer rectangle.
rectangle(BASE_X, BASE_Y, width, height, ‘white’)
# Draw the middle rectangle.
middle_x = BASE_X + width / 8
middle_y = BASE_Y + height / 8
middle_width = width – width / 4
middle_height = height – height / 4
rectangle(middle_x, middle_y, middle_width, middle_height, ‘white’)
# Draw the innermost rectangle.
inner_x = BASE_X + width / 4
inner_y = BASE_Y + height / 4
inner_width = width – width / 2
inner_height = height – height / 2
rectangle(inner_x, inner_y, inner_width, inner_height, ‘black’)
# Draw the diagonal connecting lines.
turtle.penup()
turtle.goto(BASE_X, BASE_Y)
turtle.pendown()
turtle.goto(inner_x, inner_y)
turtle.penup()
turtle.goto(BASE_X + width, BASE_Y + height)
turtle.pendown()
turtle.goto(inner_x + inner_width, inner_y + inner_height)
turtle.penup()
turtle.goto(BASE_X + width, BASE_Y)
turtle.pendown()
turtle.goto(inner_x + inner_width, inner_y)
turtle.penup()
turtle.goto(BASE_X, BASE_Y + height)
turtle.pendown()
turtle.goto(inner_x, inner_y + inner_height)
# Draw the horizontal connecting lines.
turtle.penup()
turtle.goto(BASE_X, BASE_Y + height / 2)
turtle.pendown()
turtle.goto(inner_x, BASE_Y + height / 2)
turtle.penup()
turtle.goto(BASE_X + width, BASE_Y + height / 2)
turtle.pendown()
turtle.goto(inner_x + inner_width, BASE_Y + height / 2)
# Draw the vertical connecting lines.
turtle.penup()
turtle.goto(BASE_X + width / 2, BASE_Y)
turtle.pendown()
turtle.goto(BASE_X + width / 2, inner_y)
turtle.penup()
turtle.goto(BASE_X + width / 2, BASE_Y + height)
turtle.pendown()
turtle.goto(BASE_X + width / 2, inner_y + inner_height)
def main():
turtle.speed(ANIMATION_SPEED)
turtle.hideturtle()
w = int(input(‘Enter the width: ‘))
h = int(input(‘Enter the height: ‘))
rectangular_pattern(w, h)
main()