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turtles
1 parent 852bf7a commit f79e432

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‎ftree.py‎

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import pygame, math
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pygame.init()
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window = pygame.display.set_mode((600, 600))
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pygame.display.set_caption("Fractal Tree")
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screen = pygame.display.get_surface()
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def drawTree(x1, y1, angle, depth):
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if depth:
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x2 = x1 + int(math.cos(math.radians(angle)) * depth * 10.0)
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y2 = y1 + int(math.sin(math.radians(angle)) * depth * 10.0)
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pygame.draw.line(screen, (255,255,255), (x1, y1), (x2, y2), 2)
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drawTree(x2, y2, angle - 20, depth - 1)
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drawTree(x2, y2, angle + 20, depth - 1)
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def input(event):
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if event.type == pygame.QUIT:
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exit(0)
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drawTree(300, 550, -90, 9)
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pygame.display.flip()
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while True:
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input(pygame.event.wait())

‎turtle/turtle_crawl.py‎

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from turtle import *
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bgcolor("lightgreen")
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shape("turtle")
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penup()
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size = 20
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for i in range(30):
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stamp() # Leave an impression on the canvas
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size = size + 3 # Increase the size on every iteration
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forward(size) # Move tess along
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right(24) # and turn her
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if i % 2 == 0:
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color("red")
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else:
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color("blue")
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mainloop()

‎turtle/turtle_fractal.py‎

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from turtle import *
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def f(length, depth):
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if depth == 0:
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forward(length)
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else:
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f(length/3, depth-1)
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right(60)
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f(length/3, depth-1)
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left(120)
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f(length/3, depth-1)
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right(60)
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f(length/3, depth-1)
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f(500, 4)

‎turtle/turtle_multi.py‎

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from turtle import *
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def draw_multicolor_square(sz):
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"""Make turtle t draw a multi-color square of sz."""
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for i in ["red", "purple", "hotpink", "blue"]:
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color(i)
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forward(sz)
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left(90)
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bgcolor("lightgreen")
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pensize(3)
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size = 20 # Size of the smallest square
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for i in range(15):
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draw_multicolor_square(size)
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size = size + 10 # Increase the size for next time
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forward(10) # Move along a little
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right(18) # and give her some turn
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mainloop()

‎turtle/turtle_snowflake.py‎

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from turtle import *
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def koch(depth, size):
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if depth == 0:
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forward(size)
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else:
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recurse = lambda: koch(depth-1, size/3)
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recurse()
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left(60)
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recurse()
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right(120)
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recurse()
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left(60)
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recurse()
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koch(3, 3**4)

‎turtle/turtle_star.py‎

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from turtle import *
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color('red', 'yellow')
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begin_fill()
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while True:
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forward(200)
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left(170)
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if abs(pos()) < 1:
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break
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end_fill()
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done()

‎turtle/turtle_traffic.py‎

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from turtle import *
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setup(400, 500)
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title("Tess becomes a traffic light!")
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bgcolor("lightgreen")
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def draw_housing():
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""" Draw a nice housing to hold the traffic lights """
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pensize(3)
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color("black", "darkgrey")
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begin_fill()
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forward(80)
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left(90)
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forward(200)
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circle(40, 180)
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forward(200)
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left(90)
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end_fill()
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draw_housing()
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penup()
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# Position onto the place where the green light should be
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forward(40)
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left(90)
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forward(50)
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# Turn into a big green circle
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shape("circle")
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shapesize(3)
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fillcolor("green")
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# A traffic light is a kind of state machine with three states,
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# Green, Orange, Red. We number these states 0, 1, 2
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# When the machine changes state, we change position and
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# her fillcolor.
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# This variable holds the current state of the machine
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state_num = 0
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def advance_state_machine():
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global state_num
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if state_num == 0: # Transition from state 0 to state 1
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forward(70)
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fillcolor("orange")
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state_num = 1
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elif state_num == 1: # Transition from state 1 to state 2
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forward(70)
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fillcolor("red")
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state_num = 2
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else: # Transition from state 2 to state 0
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back(140)
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fillcolor("green")
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state_num = 0
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# Bind the event handler to the space key.
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onkey(advance_state_machine, "space")
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listen() # Listen for events
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mainloop()

‎turtle/turtle_xmas.py‎

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n = 50.
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from turtle import *
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speed("fastest")
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left(90)
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forward(3*n)
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color("orange", "yellow")
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begin_fill()
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left(126)
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for i in range(5):
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forward(n/5)
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right(144)
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forward(n/5)
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left(72)
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end_fill()
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right(126)
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color("dark green")
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backward(n*4.8)
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def tree(d, s):
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if d <= 0:
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return
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forward(s)
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tree(d-1, s*.8)
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right(120)
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tree(d-3, s*.5)
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right(120)
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tree(d-3, s*.5)
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right(120)
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backward(s)
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tree(15, n)
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backward(n/2)
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while True:
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pass

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