花.py

# -*- coding: cp936 -*-

import turtle

import math

 

def 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) / 360

    n = 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 »¨°ê 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 Ò¶×Ó 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.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()