import turtle
import time
 
 
# 清屏函數(shù)
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)
 
 
# 重定位海龜?shù)奈恢?def go_to(x, y, state):
 turtle.pendown() if state else turtle.penup()
 turtle.goto(x, y)
 
 
# 畫線
# state為真時海龜回到原點，為假時不回到原來的出發(fā)點
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()
 
 
# 畫箭羽
def draw_feather(size):
 angle = 30  # 箭的傾角
 feather_num = size//6# 羽毛的數(shù)量
 feather_length = size // 3 # 羽毛的長度
 feather_gap = size//10  # 羽毛的間隔
 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)
 
 
# 畫愛心
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()
 
 
# 畫箭
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
# 箭的頭沒有畫出來，而是用海龜來代替
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)
 
 
# 畫出發(fā)射愛心的小人
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()
 
 
# 第一個畫面，顯示文字
def page0():
 turtle.penup()
 turtle.goto(-350, 0)
 turtle.color('black')
 turtle.write('專屬于我們的情人節(jié)', font=('宋體', 60, 'normal'))
 time.sleep(3)
 
 
# 第二個畫面，顯示發(fā)射愛心的小人
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)
 
 
# 最后一個畫面，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()