使用turtle画的一些图(2)

又是一些代码的集合。turtle 是个挺好玩的库。
用乌龟画一个螺旋楼梯，代码如下

#draw a spiral staircase
def draw_circle_turtle():
    wn=turtle.Screen()
    wn.bgcolor("lightgreen")
    tess=turtle.Turtle()
    tess.shape("turtle")
    tess.color("blue")
    tess.penup()
    size=20
    for i in range(30):
        tess.stamp()
        size=size+3
        tess.forward(size)
        tess.right(24)
    wn.mainloop()

画一个五角星：

#print a pentagram
def draw_pentagram():
    wn=turtle.Screen()
    wn.bgcolor("lightgreen")
    tess=turtle.Turtle()
    #tess.shape("turtle")
    tess.color("blue")
    for i in range(5):
        tess.forward(100)
        tess.right(180*4//5)
    wn.mainloop()

打印一个钟表，这个很好玩，我写了三个方法来实现，不过都有些少许的差异。

#print a clock
def draw_clock():
    wn=turtle.Screen()
    wn.bgcolor("lightgreen")
    tess=turtle.Turtle()
    tess.shape("turtle")
    tess.color("blue")
    for i in range(12):
        tess.penup()
        tess.circle(100,30)
        tess.pendown()
        tess.stamp()
    tess.left(90)
    tess.penup()
    tess.forward(100)
    wn.mainloop()

def draw_clock2():
    wn=turtle.Screen()
    wn.bgcolor("lightgreen")
    tess=turtle.Turtle()
    tess.shape("turtle")
    tess.color("blue")
    tess.stamp()
    tess.penup()
    tess.forward(100)
    for i in range(12):
        tess.stamp()
        tess.penup()
        tess.left(360/12)
        tess.forward(100*3.14*2/12)
        tess.pendown()
    wn.mainloop()

def draw_clock3():
    wn=turtle.Screen()
    wn.bgcolor("lightgreen")
    tess=turtle.Turtle()
    tess.shape("turtle")
    tess.color("blue")
    tess.stamp()
    for i in range(12):
        tess.penup()
        tess.forward(100)
        tess.pendown()
        tess.forward(10)
        tess.penup()
        tess.forward(10)
        tess.stamp()
        tess.home()
        tess.left(30*(i+1))
    wn.mainloop()