python画爱心[通俗易懂]

import turtle
import time
# 清屏函数
def clear_all():
turtle.penup()
turtle.goto(0, 0)
turtle.color('white')
turtle.pensize(800)
turtle.pendown()
turtle.setheading(0)
turtle.fd(300)
turtle.bk(600)
# 重定位海龟的位置
def go_to(x, y, state):
turtle.pendown() if state else turtle.penup()
turtle.goto(x, y)
# 画线
# state为真时海龟回到原点，为假时不回到原来的出发点
def draw_line(length, angle, state):
turtle.pensize(1)
turtle.pendown()
turtle.setheading(angle)
turtle.fd(length)
turtle.bk(length) if state else turtle.penup()
turtle.penup()
# 画箭羽
def draw_feather(size):
angle = 30                          # 箭的倾角
feather_num = size//6               # 羽毛的数量
feather_length = size // 3          # 羽毛的长度
feather_gap = size//10              # 羽毛的间隔
for i in range(feather_num):
draw_line(feather_gap, angle+180, False)            # 箭柄，不折返
draw_line(feather_length, angle + 145, True)        # 羽翼，要折返
draw_line(feather_length, angle + 145, False)
draw_line(feather_num*feather_gap, angle, False)
draw_line(feather_length, angle + 145 + 180, False)
for i in range(feather_num):
draw_line(feather_gap, angle+180, False)            # 箭柄，不折返
draw_line(feather_length, angle - 145, True)        # 羽翼，要折返
draw_line(feather_length, angle - 145, False)
draw_line(feather_num*feather_gap, angle, False)
draw_line(feather_length, angle - 145 + 180, False)
# 画爱心
def draw_heart(size):
turtle.color('red', 'pink')
turtle.pensize(2)
turtle.pendown()
turtle.setheading(150)
turtle.begin_fill()
turtle.fd(size)
turtle.circle(size * -3.745, 45)
turtle.circle(size * -1.431, 165)
turtle.left(120)
turtle.circle(size * -1.431, 165)
turtle.circle(size * -3.745, 45)
turtle.fd(size)
turtle.end_fill()
# 画箭
def draw_arrow(size):
angle = 30
turtle.color('black')
draw_feather(size)
turtle.pensize(4)
turtle.setheading(angle)
turtle.pendown()
turtle.fd(size*2)
# 一箭穿心
# 箭的头没有画出来，而是用海龟来代替
def arrow_heart(x, y, size):
go_to(x, y, False)
draw_heart(size*1.15)
turtle.setheading(-150)
turtle.penup()
turtle.fd(size*2.2)
draw_heart(size)
turtle.penup()
turtle.setheading(150)
turtle.fd(size * 2.2)
draw_arrow(size)
# 画出发射爱心的小人
def draw_people(x, y):
turtle.penup()
turtle.goto(x, y)
turtle.pendown()
turtle.pensize(2)
turtle.color('black')
turtle.setheading(0)
turtle.circle(60, 360)
turtle.penup()
turtle.setheading(90)
turtle.fd(75)
turtle.setheading(180)
turtle.fd(20)
turtle.pensize(4)
turtle.pendown()
turtle.circle(2, 360)
turtle.setheading(0)
turtle.penup()
turtle.fd(40)
turtle.pensize(4)
turtle.pendown()
turtle.circle(-2, 360)
turtle.penup()
turtle.goto(x, y)
turtle.setheading(-90)
turtle.pendown()
turtle.fd(20)
turtle.setheading(0)
turtle.fd(35)
turtle.setheading(60)
turtle.fd(10)
turtle.penup()
turtle.goto(x, y)
turtle.setheading(-90)
turtle.pendown()
turtle.fd(40)
turtle.setheading(0)
turtle.fd(35)
turtle.setheading(-60)
turtle.fd(10)
turtle.penup()
turtle.goto(x, y)
turtle.setheading(-90)
turtle.pendown()
turtle.fd(60)
turtle.setheading(-135)
turtle.fd(60)
turtle.bk(60)
turtle.setheading(-45)
turtle.fd(30)
turtle.setheading(-135)
turtle.fd(35)
turtle.penup()
# 第一个画面，显示文字
def page0():
turtle.penup()
turtle.goto(-350, 0)
turtle.color('black')
turtle.write('专属于我们的情人节', font=('宋体', 60, 'normal'))
time.sleep(3)
# 第二个画面，显示发射爱心的小人
def page1():
turtle.speed(10)
draw_people(-250, 20)
turtle.penup()
turtle.goto(-150, -30)
draw_heart(14)
turtle.penup()
turtle.goto(-20, -60)
draw_heart(25)
turtle.penup()
turtle.goto(250, -100)
draw_heart(45)
turtle.hideturtle()
time.sleep(3)
# 最后一个画面，一箭穿心
def page2():
turtle.speed(1)
turtle.penup()
turtle.goto(-200, -200)
turtle.color('blue')
turtle.pendown()
turtle.write('ZBT       CJH', font=('wisdom', 50, 'normal'))
turtle.penup()
turtle.goto(0, -180)
draw_heart(10)
arrow_heart(20, -60, 51)
turtle.showturtle()
def main():
turtle.setup(900, 500)
page0()
clear_all()
page1()
clear_all()
page2()
turtle.done()
main()