实验6

task1

from turtle import *
def move(x, y):
    penup()
    goto(x, y)
    pendown()
def draw(n, size = 100):
    for i in range(n):
        fd(size)
        left(360/n)
def main():
    pensize(2)
    pencolor('red')
    move(-200, 0)
    draw(3)
    move(0, 0)
    draw(4)
    move(200, 0)
    draw(5)
    hideturtle()
    done()
    
main()

 task1_2

from turtle import *
def moveto(x, y):
   penup()
   goto(x, y)
   pendown()
def main():
   pensize(2)
   pencolor('blue')
   moveto(-150, 0)
   circle(50)
   moveto(0, 0)
   circle(50, steps = 4)
   moveto(150, 0)
   circle(50, steps = 5)
   moveto(300, 0)
   circle(50, steps = 6)
   hideturtle()
   done()
main()

task2

from turtle import *
def moveto(x, y):
    penup()
    goto(x, y)
    pendown()
def main():
    setup(800, 600)
    radius = 20 
    offset = 20
    for i in range(9):
        moveto(0, -radius)
        circle(radius)
        radius += offset
    hideturtle()
    done()
main()

task2_2

from turtle import *
from random import random

def moveto(x, y):
    penup()
    goto(x, y)
    pendown()
def gen_color():
    return tuple((random() for i in range(3)))
def main():
    setup(800, 600)
    radius = 180
    offset = 20
    for i in range(8):
        moveto(0, -radius)
        color(gen_color())

        begin_fill()
        circle(radius)
        end_fill()
        radius -= offset
    hideturtle()
    done()

main()

task3_1

from turtle import *
def square(size = 50, rgb = 'pink'):
    pencolor(rgb)
    for i in range(4):
        fd(size)
        left(90)
def main():
    setup(800, 600)
    speed(0)
    n = 3
    for i in range(n):
        square(80)
        left(360/n)
    hideturtle()
    done()
main()

task3_2

from turtle import *
setup(800, 600)
pencolor('pink')
n = 4
for i in range(4):
    for j in range(2):
        circle(80, 90)
        left(90)
    right(360/n)
hideturtle()
done()

task4

from turtle import *
setup(800, 600)
bgcolor('black')
pencolor('white')
speed(0)
angle = 0
size = 2
n = 4 # 螺旋n边形
count = 50 # 循环次数
for i in range(count):
    fd(size)
    angle += 360/n + 1
    seth(angle)
    size += 5
hideturtle()
done()

task5

import turtle as t
t.hideturtle()
t.penup()
t.goto(50*2**(1/2),50*2**(1/2))
t.pendown()
t.begin_fill()
for i in range(4):
    t.right(90)
    t.forward(100*2**(1/2))
t.fillcolor('black')
t.end_fill()

t.penup()
t.goto(0,50*2**(1/2))
t.pendown()
t.begin_fill()
t.right(45)
for i in range(4):
    t.forward(100)
    t.right(90)
t.fillcolor('red')
t.end_fill()

t.exitonclick()

task5_2

import turtle as t
t.pencolor('blue')
r=40
t.penup()
t.goto(0,-60)
t.pendown()
for i in range(5):
    r+=20
    t.circle(r)
    t.penup()
    t.goto(0,-(60+20*(i+1)))
    t.pendown()
t.begin_fill()
t.penup()
t.goto(0,0)
t.pendown()
t.penup()
t.left(90)
t.forward(140)
t.left(90)
t.fd(140)
t.left(90)
t.fd(280)
t.left(90)
t.fd(280)
t.left(90)
t.fd(140)
t.left(90)
t.fd(140)
t.fillcolor('white')
t.end_fill()
t.penup()
t.goto(0,140)
t.pendown()
t.goto(0,0)
t.goto(140,0)
t.hideturtle()
t.pencolor('white')
t.exitonclick()

task6

import turtle as t
t.pensize()
t.bgcolor('black')
t.begin_fill()
t.circle(200,360)
t.fillcolor('yellow')
t.end_fill()

t.penup()
t.goto(0,200)
t.pendown()
t.begin_fill()
t.left(45)
for i in range(4):
    t.forward(200)
    t.right(90)
t.fillcolor('black')
t.end_fill()
t.penup()
t.goto(20,300)
t.pendown()
t.hideturtle()
t.begin_fill()
t.circle(8)
t.fillcolor('black')
t.end_fill()
t.penup()
t.goto(21,306)
t.pendown()
t.begin_fill()
t.circle(2)
t.fillcolor('white')
t.end_fill()
t.exitonclick()
t.down()