def main():
    turtle.setup(1300, 800, 0, 0)   # 启动图形窗口
    pythonsize = 10
    turtle.pensize(pythonsize)
    turtle.pencolor("blue")
    turtle.seth(-40)        # 启动时运动的方向（角度）
    drawSnake(40, 80, 5, pythonsize/2)

def main():
	turtle.setup(1300, 800, 0, 0)
	pythonsize = 30
	turtle.pensize(pythonsize)
	turtle.pencolor('blue')
	turtle.seth(-40)
	drawSnake(rad = 40, angle = 80, len = 5, neckrad = pythonsize/2 )

def main():
    turtle.setup(1300, 800, 0, 0)
    pythonsize = 30
    turtle.pensize(pythonsize)
    turtle.pencolor("blue")
    turtle.seth(-40)
    drawSnake(40, 80, 5, pythonsize / 2)

def main():
    file_name = "go"
    
    file_name = raw_input( 'Enter a file name or exit to quit program: ')
    while (file_name != "exit" and file_name != "Exit" and file_name != "quit" and file_name != "Quit"):

        f = open( file_name, 'r' )
    
        first_line = f.readline()
        first_line = first_line.split()
    
        distance = float( first_line[0] )
        angle = float( first_line[1] )
    
        stack = []

        wn = tur.Screen()

        for line in f:
            wn.clear()
            tur.penup()
            tur.seth(90)
            tur.setx(0)
            tur.sety(-200)
            tur.pendown()
            interprit_line(tur, line, angle, distance, stack)
        ts = tur.getscreen()
        ts.getcanvas().postscript(file=file_name +".eps")
        wn.exitonclick()

        file_name = raw_input( 'Enter a file name or exit to quit program: ')

def circle(r, n, angle):
	turtle.seth(angle)
	a = 2*r*sin(pi/n)
	phi = 180*(1-2/n)
	for i in range(int(n/2)+1):
		turtle.forward(a)
		turtle.right(180-phi)

def pop_right():
	x,y,h = pos_stack.pop()
	turtle.up()
	turtle.setpos(x,y)
	turtle.seth(h)
	turtle.right(45)
	turtle.down()

def main():  
    turtle.setup(1300,800,0,0)  
    pythonsize=1  
    turtle.pensize(pythonsize)  
    turtle.pencolor("black")  
    turtle.seth(-40)  
    drawSnack(40,80,5,pythonsize/2)  

def main():
    turtle.setup(1300, 800, 10, 10)
    pensize = 30
    turtle.pensize(pensize)
    turtle.pencolor('blue')
    turtle.seth(-40)
    draw_snake(40, 80, 5, pensize / 2)
    turtle.done()

def pop(dummy):
    global stack
    turtle.up()
    turtle.goto(stack[-1][0])
    turtle.seth(stack[-1][1])
    stack = stack[:-1]
    turtle.down()
    return dummy[1:]

def draw_background():
    t.setup(300, 500)
    t.title('Hangman')
    t.pu()
    t.setpos(-100, -200)
    t.seth(0)
    t.pd()
    t.fd(200)

def draw_wall(x, y):
    goto(x, y)
    turtle.color("red")
    if y % 2 == 0:
        turtle.seth(0)
    else:
        turtle.seth(90)
    turtle.forward(5)
    turtle.back(10)

def main():
#初始化窗口（宽度，高度，距屏幕左边距离，距屏幕顶边距离）
    turtle.setup(1300,700,0,20)
    pythonsize=30
    turtle.pensize(pythonsize)
    turtle.pencolor("blue")
    #定义初始爬行方向
    turtle.seth(-40)
    drawSnake(40,80,5,pythonsize/2)

def dibujar_cuadrado(x, y, a):
    up()
    goto(x + 0.5 * a,
         y - 0.5 * a)
    seth(90)
    down()
    for i in range(4):
        forward(a)
        left(90)

	def draw(self):
		'''
		Draws the object at its current (x, y) coordinates.
		'''
		turtle.goto(self.x, self.y)
		turtle.seth(self.heading())
		turtle.shape(self.shape)
		turtle.color(self.color)
		return turtle.stamp()

def drawSnake(radius,angle,length):
    turtle.seth(-45)
    for i in range(length):
        turtle.circle(redius,angle)
        turtle.circle(-redius,angle)
    turtle.circle(redius,angle/2)
    turtle.fd(40)
    turtle.circle(16,180)
    turtle.fd(40*3/2)

def main():
	#width,height
	turtle.setup(1000,200,100,100)
	pythonsize = 50
	#trace width
	turtle.pensize(pythonsize)
	turtle.pencolor("red")
	#trace direction
	turtle.seth(-40)
	drawSnake(40,80,3,pythonsize/2)

def owoc():
    t.pu()
    t.lt(30)
    t.fd(B)
    t.lt(30)
    t.fd(B)
    t.seth(300)
    t.pd()


    for i in range(5):         #pierwsza warstwa
        wsk_romb("olive")
        t.rt(30)

    t.lt(30)                        #druga warstwa
    for i in range(4):
        t.fd(B)
        t.lt(30)
        szer_romb("green")
        t.rt(30)
        t.bk(B)
        t.lt(30)

    t.rt(120)                       # trzecia warstwa
    for i in range(3):
        for j in range(2):
            t.fd(B)
            t.lt(30)
        kwadrat("yellow")
        for j in range(2):
            t.rt(30)
            t.bk(B)
        t.lt(30)

    t.rt(30)                        #czwarta warstwa
    for i in range(2):
        for j in range(3):
            t.fd(B)
            t.rt(30)
        t.fd(B)
        t.lt(180)
        szer_romb("orange")
        t.rt(180)
        t.bk(B)
        for j in range(3):
            t.lt(30)
            t.bk(B)
            
        t.lt(30)

    for i in range(5):          #piąta warstwa
        t.fd(B)
        t.rt(30)

    wsk_romb("red")

	def horizontal(row):
		turtle.goto(xstart, ystart - length * (row + 1))
		turtle.seth(0)
		for x in range(0, maze.size):
			status = maze.cells[row * maze.size + x].edges[-1].walled
			if status:
				turtle.down()
			else:
				turtle.up()
			turtle.forward(length)
		turtle.up()

def heart(x,y,h=100):
    go(x,y)
    turtle.fillcolor("white")
    turtle.begin_fill()
    turtle.goto(x-h/2, y+0.75*h)
    turtle.seth(90)
    turtle.circle(-h/4, extent=180)
    turtle.seth(90)
    turtle.circle(-h/4, extent=180)
    turtle.goto(x,y)
    turtle.end_fill()
    go(x+h/2,y)

def main():  
    turtle.setup(1300,800,0,0)  
    pythonsize=1  
    turtle.pensize(pythonsize)
    turtle.fd(100)  
    turtle.pencolor("black")  
    turtle.seth(120)
    turtle.fd(100)  
    turtle.pencolor("black")
    turtle.seth(240)
    turtle.fd(100)  
    turtle.pencolor("black")