# -*- coding: utf-8 -*-# @Time : 18-9-14 下午3:23# @Author : Felix Wangimport turtleimport mathdef p_line(t, n, length, angle): """Draws n line segments.""" for i in range(n): t.fd(length) t.lt(angle)def polygon(t, n, length): """Draws a polygon with n sides.""" angle =360/ n p_line(t, n, length, angle)def arc(t, r, angle): """Draws an arc with the given radius and angle.""" arc_length = 2 * math.pi * r * abs(angle) /360n = int(arc_length / 4) + 1 step_length = arc_length / n step_angle = float(angle) / n # Before starting reduces, making a slight left turn. t.lt(step_angle / 2) p_line(t, n, step_length, step_angle) t.rt(step_angle / 2)def petal(t, r, angle): """Draws a 花瓣 using two arcs.""" for i in range(2): arc(t, r, angle) t.lt(180 - angle)def flower(t, n, r, angle, p): """Draws a flower with n petals.""" for i in range(n): petal(t, r, angle) t.lt(p / n)def leaf(t, r, angle, p): """Draws a 叶子 and fill it.""" t.begin_fill() # Begin the fill process. t.down() flower(t, 1, r, angle, p) t.end_fill()def main(): window = turtle.Screen() # creat a screen window.bgcolor("white") window.title("draw a flower") lucy = turtle.Turtle() lucy.shape("turtle") lucy.color("red") lucy.width(3) # lucy.speed(10) # Drawing flower flower(lucy, 7, 60, 100,360) # Drawing pedicel lucy.color("brown") lucy.rt(90) lucy.fd(200) # Drawing leaf 1 lucy.width(1) lucy.rt(270) lucy.color("green") leaf(lucy, 40, 80, 180) lucy.rt(140) lucy.color("black") lucy.fd(30) lucy.lt(180) lucy.fd(30) # Drawing leaf 2 lucy.rt(120) lucy.color("green") leaf(lucy, 40, 80, 180) lucy.color("black") lucy.rt(140) lucy.fd(30) lucy.ht() # hideturtle window.exitonclick()main()
