# CS150 class examples of turtle functions, for loops, random numbers # NOTE: If you call these functions from the shell, the drawing window pops up. # Use "clear()" to clear the window of any drawings, and "bye()" to close the # window. The latter may require you to restart the Python shell (with the stop # sign) to start drawing again. # Note that docstrings are simplified to fit more on the screen at one time from turtle import * from random import randint def square(length): """ Draw a square with sides of length """ forward(length) right(90) forward(length) right(90) forward(length) right(90) forward(length) right(90) def iterative_square(length): """ Draw a square with sides of length using a loop """ for i in range(4): forward(length) right(90) def simple_star(): """ Draw a star """ for i in range(36): forward(100) backward(100) right(10) def asterisk_star(length, spokes): """ Draw an asterisk star with spokes number of spokes of length length """ angle = 360/spokes for i in range(spokes): forward(length) backward(length) right(angle) def simple_spiral(): """ Draw a spiral """ for i in range(50): forward(i*5) right(55) # A good example is side = 200 and angle = 89 def spiral(sides, angle): """ Draw spiral with sides steps and update of angle """ for i in range(sides): forward(i*5) right(angle) def rotating_circles(radius, num): """ Draw num rotating circles with radius """ angle = 360/num for i in range(num): circle(radius) right(angle) def scribble(num_lines): """ Randomly draw num_lines lines """ for i in range(num_lines): x = randint(-100,100) y = randint(-100,100) goto(x,y) def walk(num_steps, step_size): """ Random walk with num_steps steps of step_size """ for i in range(num_steps): angle = randint(-90, 90) right(angle) forward(step_size) def pretty_picture(): """ Draw random stars """ for i in range(10): # Get some random values spokes = randint(5, 30) length = randint(10, 60) angle = randint(-90,90) move = randint(20, 100) # Move randomly somewhere else right(angle) forward(move) # Draw a random star there asterisk_star(length, spokes)