实验6

task1_1.py

实验源码：

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()

运行结果：

task1_2.py

实验源码：

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()

运行结果：

task2_1.py

实验源码：

'''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()

运行结果：

task2_2.py

实验源码：

 1 '''以(0, 0)为圆心，绘制9个彩色同心圆，色彩随机生成'''
 2 from turtle import *
 3 from random import random
 4 def moveto(x, y):
 5     '''把画笔移至坐标(x,y)处'''
 6     penup()
 7     goto(x, y)
 8     pendown()
 9 def gen_color():
10     '''生成一个以rgb三元组表示的颜色值并返回'''
11     return tuple((random() for i in range(3)))
12 def main():
13     setup(800, 600)
14     radius = 180 # 圆初始半径
15     offset = 20 # 同心圆每次位移量
16     for i in range(8):
17         moveto(0, -radius)
18         color(gen_color())
19 
20         begin_fill()
21         circle(radius)
22         end_fill()
23 
24         radius -= offset
25     hideturtle()
26     done()
27 
28 main()

运行结果：

task3_1.py

实验源码：

 1 from turtle import *
 2 setup(800, 600)
 3 pencolor('pink')
 4 n = 10
 5 for i in range(4):
 6 
 7     for j in range(2):
 8         circle(80, 90)
 9         left(90)
10     right(360/n)
11 hideturtle()
12 done()

运行结果：

task3_2.py

实验源码：

 1 from turtle import *
 2 setup(800, 600)
 3 pencolor('pink')
 4 n = 10
 5 for i in range(n):
 6 
 7     for j in range(2):
 8         circle(80, 90)
 9         left(90)
10     right(360/n)
11 hideturtle()
12 done()

运行结果：

task4.py

实验源码：

 1 from turtle import *
 2 setup(800, 600)
 3 bgcolor('black')
 4 pencolor('white')
 5 speed(0)
 6 angle = 0
 7 size = 2
 8 n = 5 # 螺旋n边形
 9 count = 50 # 循环次数
10 for i in range(count):
11     fd(size)
12     angle += 360/n
13     seth(angle)
14     size += 5
15 hideturtle()
16 done()

运行结果：

task5_1.py

实验源码：

 1 from turtle import *
 2 setup(800, 600)
 3 penup()
 4 goto(0,0)
 5 pendown()
 6 pensize(3)
 7 pencolor("black")
 8 fillcolor("black")
 9 begin_fill()
10 for i in range(4):
11     forward(200)
12     left(90)
13 end_fill()
14 penup()
15 goto(100,0)
16 pendown()
17 pencolor("red")
18 fillcolor("red")
19 begin_fill()
20 left(45)
21 forward(141)
22 left(90)
23 forward(141)
24 left(90)
25 forward(141)
26 left(90)
27 forward(141)
28 end_fill()
29 hideturtle()
30 done()

运行截图：

 task5_2.py

实验源码：

 1 from turtle import *
 2 setup(800, 600)
 3 penup()
 4 goto(0,0)
 5 pendown()
 6 pensize(2)
 7 pencolor("blue")
 8 for i in range(0,5):
 9     forward(40+i*20)
10     left(90)
11     circle(40+i*20,90)
12     left(90)
13     forward(40+i*20)
14     left(90)
15 hideturtle()
16 done()

运行结果：

task6.py

实验源码：

 1 from turtle import *
 2 setup(800,600)
 3 pencolor('yellow')
 4 color('yellow')
 5 begin_fill()
 6 pendown()
 7 goto(0,0)
 8 left(45)
 9 forward(200)
10 left(90)
11 circle(200,270)
12 left(90)
13 forward(200)
14 end_fill()
15 bgcolor('black')
16 
17 goto(0,100)
18 color('black')
19 begin_fill()
20 circle(20)
21 end_fill()
22 penup()
23 goto(-15,100)
24 pendown()
25 color('white')
26 begin_fill()
27 circle(5)
28 end_fill()
29 pendown()
30 hideturtle()
31 done()

运行结果：