"""python海龟画图继承与ondrag练习.py
本程序新建Durtle类，生成的拖动角色会换一个造型，松开它会隐藏
能读懂以下代码说明你的python海龟画图上了一个大台阶了。
"""
from turtle import *
class Durtle(Turtle):
def __init__(self,images):
Turtle.__init__(self,visible=False)
self.begin_drag = 0 # 拖的标志
self.penup()
self.images = images # 造型列表
self.index = 0 # 初始造型索引
self.amounts = len(images) # 造型数量
"设定初始造型"
self.image = self.images[self.index] # 当前造型
self.shape(self.image) # 设定造型
self.st() # 显示
self.ondrag(self.act1)
self.onrelease(self.act2)
def alt_costume(self):
"切换到下一个造型"
if self.begin_drag == 0:
self.index = self.index + 1
self.index = self.index % self.amounts
self.image = self.images[self.index]
self.shape(self.image)
self.begin_drag += 1
def act1(self,x,y):
"""切换到下一个造型，定位到鼠标指针坐标"""
self.alt_costume()
self.goto(x,y)
def act2(self,x,y):
self.ht()
self.goto(10000,10000) # 走你,扔到远远的一个地方去眼不见为净
self.begin_drag = 0
#print("松开")
if __name__ == "__main__":
images = "dog2-a.gif","dog2-b.gif","dog2-c.gif"
width,height = 480,360
screen = Screen()
screen.setup(width,height)
screen.delay(0)
[screen.addshape(image) for image in images]
d = Durtle(images)
screen.mainloop()
