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from turtle import *
from math import pi,sin,cos
from random import random,randint
from time import sleep
from kandinsky import fill_rect

# ecran blanc et toile grise
fill_rect(0,0,320,222,(255,)*3)
color((200,)*3)
pensize(2)
# on dessine la toile
for r in range(2, 100, 10):
    penup()
    goto(r, 0)
    pendown()
    for i in range(1, 9):
        # Trace legerement aleatoire
        for j in range(10):
            x = r * cos(random()/10 + pi * 2 * (i - 1 + sin(j * pi / 20)) / 8)
            y = r * sin(pi * 2 * (i - 1 + sin(j * j * pi / 200)) / 8)            
            goto(x, y)
        # les rayons
        setheading(i * 360 / 8)
        forward(10)
        backward(10)
goto(0,0)
penup()
speed(4)
# tortue
color((0,0,0))
while True:    
    (x,y) = position()
    # elle ne doit pas sortir de la toile
    if x * x + y * y > 90*90:
        setheading(heading()+180)
    else : setheading(randint(0,360))
    # elle bouge
    forward(5)
    sleep(.5)
    # un insecte arrive sur la toile
    if random()<.25:
        x = int(70 * (2 * random() - 1))
        y = int(70 * (2 * random() - 1))
        fill_rect(160 + x, 110 + y, 3, 3, (255,0,0))
        # la tortue va le manger
        goto(x, - y)