实验6

实验任务1

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()

task2

源代码：

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()

实验任务2

task1

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

源代码：

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()

实验任务3

task1

源代码：

from turtle import *
def square(size = 50, rgb = 'orange'):
    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()
main()

task2

源代码：

from turtle import *
setup(800, 600)
pencolor('pink')
n = 10
for i in range(10):
    # 绘制一片花瓣
    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 *
def moveto(x, y):
    penup()
    goto(x, y)
    pendown()

def main():
    moveto(-100,-100)
    color('black')
    begin_fill()
    for i in range(4):
        forward(200)
        left(90)
    end_fill()
    color('red')
    begin_fill()
    moveto(0,-100)
    circle(100,steps=4)
    end_fill()
main()

from turtle import *
def moveto(x, y):
    penup()
    goto(x, y)
    pendown()

def main():
    pencolor('blue')
    pensize(2)
    n=40
    for i in range(5):
        moveto(0,0)
        forward(n)
        left(90)
        circle(n,90)
        left(90)
        forward(n)
        left(90)
        n+=20

main()

from turtle import *
def moveto(x, y):
    penup()
    goto(x, y)
    pendown()

def main():
    bgcolor('black')
    color('yellow')
    begin_fill()
    moveto(0,0)
    left(45)
    forward(100)
    left(90)
    circle(100,270)
    left(90)
    forward(100)
    end_fill()
    moveto(15,60)
    color('black')
    begin_fill()
    circle(10,360)
    end_fill()
    moveto(5,55)
    color('white')
    begin_fill()
    circle(2,360)
    end_fill()
hideturtle()
main()