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关于帖子里一篇贪吃蛇的源码,有一段代码不懂,求鱼油们解释下,感谢
def queue_handler(self):
try:
while True:
task = self.queue.get(block=False) #任务变量
if task.get('game_over'):
self.game_over()
elif task.get('move'):
points = [x for point in task['move'] for x in point]
self.canvas.coords(self.snake, *points)
elif task.get('food'):
self.canvas.coords(self.food, *task['food'])
elif task.get('points_score'):
self.canvas.itemconfigure(self.point_score,
text='score:{}'.format(task['points_score']))
self.queue.task_done()
except queue.Empty:
if not self.is_game_over:
self.canvas.after(100, self.queue_handler)
就是这个代码,看不懂,求解释下
还有Queue队列在这里是干嘛用的
以下是源代码
- __author__ = 'ChenYan'
- from tkinter import *
- import threading
- import queue
- import time
- import random
- class GUI(Tk):
- '''class GUI use to create the gui'''
- def __init__(self, queue):
- Tk.__init__(self)
- self.queue = queue
- self.is_game_over = False
- self.canvas = Canvas(self, width=495, height=305, bg='#000000')
- self.canvas.pack()
- self.snake = self.canvas.create_line((0,0),(0,0), fill='#FFFF00', width=10)
- self.food = self.canvas.create_rectangle(0,0,0,0, fill='#00FF00', outline='#00FF00')
- self.point_score = self.canvas.create_text(455, 15, fill='white', text='score:0')
- self.queue_handler()
- def restart(self):
- self.destroy()
- main()
- def queue_handler(self):
- try:
- while True:
- task = self.queue.get(block=False)
- if task.get('game_over'):
- self.game_over()
- elif task.get('move'):
- points = [x for point in task['move'] for x in point]
- self.canvas.coords(self.snake, *points)
- elif task.get('food'):
- self.canvas.coords(self.food, *task['food'])
- elif task.get('points_score'):
- self.canvas.itemconfigure(self.point_score,
- text='score:{}'.format(task['points_score']))
- self.queue.task_done()
- except queue.Empty:
- if not self.is_game_over:
- self.canvas.after(100, self.queue_handler)
- def game_over(self):
- self.is_game_over = True
- self.canvas.create_text(220, 150, fill='white',text='Game Over!')
- quitbtn = Button(self, text='Quit', command=self.destroy)
- retbtn = Button(self, text='Resume', command=self.restart)
- self.canvas.create_window(230, 180, anchor=W, window=quitbtn)
- self.canvas.create_window(200, 180, anchor=E, window=retbtn)
- class Food():
- '''class Food use to make food'''
- def __init__(self, queue):
- self.queue = queue
- self.make_food()
- def make_food(self):
- x = random.randrange(5, 480, 10)
- y = random.randrange(5, 295, 10)
- self.position = x,y
- self.exppos = x-5,y-5,x+5,y+5
- self.queue.put({'food':self.exppos})
- class Snake(threading.Thread):
- '''class Snake use to create snake and response action'''
- def __init__(self, gui, queue):
- threading.Thread.__init__(self)
- self.gui = gui
- self.queue = queue
- self.daemon = True
- self.points_score = 0
- self.snake_points = [(495,55),(485,55),(475,55),(465,55),(455,55)]
- self.food = Food(queue)
- self.direction = 'Left'
- self.start()
- def run(self):
- if self.gui.is_game_over:
- self._delete()
- while not self.gui.is_game_over:
- self.queue.put({'move':self.snake_points})
- time.sleep(0.2)
- self.move()
- def key_pressed(self,e):
- self.direction = e.keysym
- def move(self):
- new_snake_point = self.calculate_new_coordinates()
- if self.food.position == new_snake_point:
- add_snake_point = self.calculate_new_coordinates()
- self.snake_points.append(add_snake_point)
- self.points_score += 1
- self.queue.put({'points_score':self.points_score})
- self.food.make_food()
- else:
- self.snake_points.pop(0)
- self.check_game_over(new_snake_point)
- self.snake_points.append(new_snake_point)
- def calculate_new_coordinates(self):
- last_x,last_y = self.snake_points[-1]
- if self.direction == 'Up':
- new_snake_point = last_x,last_y-10
- elif self.direction == 'Down':
- new_snake_point = last_x,last_y+10
- elif self.direction == 'Left':
- new_snake_point = last_x-10,last_y
- elif self.direction == 'Right':
- new_snake_point = last_x+10,last_y
- return new_snake_point
- def check_game_over(self, snake_point):
- x,y = snake_point[0],snake_point[1]
- if not -5 < x < 505 or not -5 < y < 315 or snake_point in self.snake_points:
- self.queue.put({'game_over':True})
- def main():
- q = queue.Queue()
- gui = GUI(q)
- gui.title("我的贪吃蛇用户1847....鱼c论坛发布")
- snake = Snake(gui, q)
- gui.bind('<Key-Left>', snake.key_pressed)
- gui.bind('<Key-Right>', snake.key_pressed)
- gui.bind('<Key-Up>', snake.key_pressed)
- gui.bind('<Key-Down>', snake.key_pressed)
- gui.mainloop()
- if __name__ == '__main__':
- main()
复制代码
我觉得queue应该就是一个容器,放进去各种数据,跟多线程配合比较好用
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