实验六

task1

源代码

#1.1
from turtle import *

def moveto(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边形
    '''
    for i in range(n):
        fd(size)
        left(360/n)

def main():
    pensize(2)
    pencolor('red')

    moveto(-200,0)
    draw(3)

    moveto(0,0)
    draw(4)

    moveto(200,0)
    draw(5)

    hideturtle()
    done()

main()

　　运行结果截图

源代码：

#1.2
# 运用circle函数，实现正多边形绘制
from turtle import *

def moveto(x,y):
    '''
    画笔移动到坐标（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()

　　运行结果截图

task2

源代码

#2.1
'''以(0,0)为圆心，绘制9个同心圆'''

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():
    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()

　　运行结果截图

源代码：

#2.2
'''以(0,0)为圆心，绘制9个彩色同心圆，色彩随机生成'''

from turtle import *
from random import random

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

def gen_color():
    '''生成一个以rgb三元组表示的颜色值并返回'''
    return tuple(random() for i in range(3))

def main():
    setup(800,600)

    radius = 180 #圆初始半径
    offset = 20 #同心圆每次位移量

    for i in range(8):
        moveto(0,-radius)
        color(gen_color())

        begin_fill()
        circle(radius)
        end_fill()

        radius -= offset

    hideturtle()
    done()

main()

　　运行结果截图

task3

源代码

#3.1
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 = 50
    for i in range(n):
        square(80)
        left(360/n)
    hideturtle()
    done()
main()

　　运行结果截图

源代码

#3.2
from turtle import *

setup(800,600)
pencolor('pink')

n = 10
for i in range(n+1):
    #绘制一片花瓣
    for j in range(2):
        circle(80,90)
        left(90)

    right(360/n)

hideturtle()
done()

　　运行结果截图

task4

源代码

from turtle import *

setup(800, 600)
bgcolor('black')
pencolor('white')
speed(0)

angle = 0
size = 2

n = 5       # 螺旋n边形
count = 50  # 循环次数
for i in range(count):
    fd(size)
    angle += 360/n
    seth(angle)
    size += 5

hideturtle()
done()

　　运行结果截图

task5

源代码

#5.1
# 先画外围正方形
from turtle import *

def moveto(x, y):
    penup()
    goto(x, y)
    pendown()

color('black')
begin_fill()
moveto(-100,-100)
for i in range(4):
    fd(200)
    left(90)
end_fill()

# 再画内三角形
color('red')

begin_fill()
moveto(0,-100)
left(45)
for i in range(4):
    fd(100*2**(1/2))
    left(90)
end_fill()
hideturtle()
done()

　　运行结果截图

源代码

#5.2
from turtle import *

setup(400, 400)
pencolor('blue')
pensize(2)
speed(0)


def func(n, r):
    for i in range(n):
        fd(r)
        left(90)
        circle(r, 90)
        left(90)
        fd(r)
        left(90)
        r += 20


func(5, 40)
hideturtle()
done()

　　运行结果截图

task6

源代码

#选做2
from turtle import *
screensize(100,100,'black')

def moveto(x, y):
    penup()
    goto(x, y)
    pendown()

# 画脸
color('yellow')
begin_fill()
left(45)
fd(100)
left(90)
circle(100,270)
left(90)
fd(100)
end_fill()

# 画眼睛
moveto(10,65)
dot(15,'black')

# 画高光
moveto(8,70)
dot(8,'white')

hideturtle()
done()

　　运行结果截图