实验八

实验任务3；

from turtle import *
def square(size=50, rgb='pink'):
    '''绘制正方形
    参数size指定边长
    参数rgb指定画笔颜色
    如果没有给参数，采用默认值
    '''
    pencolor(rgb)
    for i in range(4):
        fd(size)
        left(90)
def main():
    setup(800, 600)
    speed(0)
    n =10
    for i in range(n):
        square(80)
        left(360/n)
    hideturtle()
    done()
if __name__ == '__main__':
    main()

实验任务4：

from turtle import *
setup(800, 600)
pencolor('pink')
n = 10
for i in range(n):
    # 绘制一片花瓣
    for j in range(2):
        circle(80, 90)
        left(90)
    right(360/n)
hideturtle()
done()

实验任务5：

from turtle import *
setup(800, 600)
bgcolor('black')
pencolor('white')
speed(0)
angle = 0
size = 2
n = 10
for i in range(n):
    for j in range(4):
        fd(size)
        angle += 72
        seth(angle)
        size += 5
hideturtle()
done()

实验任务6：

from turtle import *
from random import random
def moveto(x,y):
    penup()
    goto(x,y)
    pendown()
setup(800, 600)
def rect(wide,height,rgb='red'):
    rgb = tuple(random() for i in range(3))
    color(rgb)
    for i in range(2):
        begin_fill()
        fd(wide)
        left(90)
        fd(height)
        end_fill()
        left(90)
for i in range(20):
    moveto((9 - i) * 10, 0)
    rect(10, 20)
hideturtle()
done()