实验6

from turtle import *

def move(x, y):
    '''画笔移动到坐标(x,y)处'''
    penup()
    goto(x, y)
    pendown()

def draw(n, size = 100):
    '''绘制边长为size的正n变形'''
    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()

from turtle import *

def moveto(x, y):
    '''把画笔移动至坐标(x, y)处'''
    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()

'''以(0,0)为圆心，绘制9个同心圆'''

from turtle import *

def moveto(x, y):
    '''把画笔移至坐标(x,y)处'''
    penup()
    goto(x, y)
    pendown()


def main():
    setup(800, 600)

    radius = 20 # 圆初始半径
    offset = 20 # 同心圆每次位移量

    for i in range(9):
        moveto(0, -radius)
        circle(radius)
        radius += offset

    hideturtle()
    done()

main()

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()

from turtle import*
def squre(size=50,rgb='pink'):
    pencolor(rgb)
    for i in range(4):
        fd(size)
        left(90)
def main():
    setup(800,600)
    speed(0)
    n=9
    for i in range(n):
        squre(80)
        left(360/n)
    hideturtle()
    done()
main()

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

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

from turtle import*
goto(-100,-100)
color('black','black')
begin_fill()
for i in range(4):
    fd(200)
    left(90)
end_fill()
goto(-100,0)
right(90)
color('red','red')
begin_fill()
circle(100,steps=4)
end_fill()
hideturtle()
done()

from turtle import*
r=40
pencolor('blue')
pensize(2)
for i in range(5):
    fd(r)
    left(90)
    circle(r,90)
    left(180)
    r+=20
    goto(0,0)
hideturtle()
done()

from turtle import*
from random import random
setup(800,600)
def gen_color():
    return tuple((random()for i in range(3)))
for i in range(20):
    fillcolor(gen_color())
    begin_fill()
    fd(20)
    left(90)
    fd(60)
    left(90)
    fd(20)
    left(90)
    fd(60)
    left(90)
    fd(20)
    end_fill()
hideturtle()
done()