在 Tkinter Canvas Widget 内移动一个球(简单的打砖块游戏) [英] Move a ball inside Tkinter Canvas Widget (simple Arkanoid game)

问题描述

我正在尝试在 Python 和 Tkinter 的帮助下编写一个简单的打砖块.目标是使球从顶部、右侧和左侧反射.如果球员错过了球，所以球碰到了底部，比赛就会停止.

I'm trying to write a simple Arkanoid with the help of Python and Tkinter. The goal is to make the ball reflect from the top, right and left sides. And if the player misses the ball so it touches the bottom side, the game would stop.

代码如下:

from Tkinter import *
import time

root = Tk()
canv = Canvas(root, highlightthickness=0)
canv.pack(fill='both', expand=True)
top = canv.create_line(0, 0, 640, 0, fill='green', tags=('top'))
left = canv.create_line(0, 0, 0, 480, fill='green', tags=('left'))
right = canv.create_line(639, 0, 639, 480, fill='green', tags=('right'))
bottom = canv.create_line(0, 478, 640, 478, fill='red', tags=('bottom'))

rect = canv.create_rectangle(270, 468, 365, 478, outline='black', fill='gray40', tags=('rect'))
ball = canv.create_oval(0, 20, 20, 40, outline='black', fill='gray40', tags=('ball'))

delta_x = delta_y = 3
new_x, new_y = delta_x, -delta_y
while True:
    time.sleep(0.025)
    if canv.find_overlapping(canv.coords(ball)[0], canv.coords(ball)[1], canv.coords(ball)[2], canv.coords(ball)[3])[0] == 1:
        new_x, new_y = delta_x, -delta_y
        canv.move(ball, new_x, new_y)
        print 'fitst if', new_x, new_y
    if canv.find_overlapping(canv.coords(ball)[0], canv.coords(ball)[1], canv.coords(ball)[2], canv.coords(ball)[3])[0] == 2:
        new_x, new_y = delta_x, delta_y
        canv.move(ball, new_x, new_y)
        print '2nd if', new_x, new_y
    if canv.find_overlapping(canv.coords(ball)[0], canv.coords(ball)[1], canv.coords(ball)[2], canv.coords(ball)[3])[0] == 3:
        new_x, new_y = -delta_x, delta_y
        canv.move(ball, new_x, new_y)
    if canv.find_overlapping(canv.coords(ball)[0], canv.coords(ball)[1], canv.coords(ball)[2], canv.coords(ball)[3])[0] == 4:
        new_x, new_y = delta_x, -delta_y
        canv.move(ball, new_x, new_y)
    print new_x, new_y
    canv.move(ball, new_y, new_y)
    canv.update()

def move_right(event):
        canv.move(rect, 7, 0)
        pass

def move_left(event):
    canv.move(rect, -7, 0)
    pass

root.bind('<Right>', move_right)
root.bind('<Left>', move_left)

root.geometry('%sx%s+%s+%s' %(640, 480, 100, 100))
root.resizable(0, 0)
root.mainloop()

为什么球以错误的方式反射?

Why the ball reflecting in the wrong way?

推荐答案

这里有一个简单的技巧可以解决这个问题:

here is a simple hack for this problem:

delta_x = delta_y = 3
while True:
      objects = canv.find_overlapping(canv.coords(ball)[0], canv.coords(ball)[1], canv.coords(ball)[2], canv.coords(ball)[3])
      for obj in objects:
        if obj == 1:
            delta_y = -delta_y
        if obj == 2:
            delta_x = -delta_x
        if obj == 3:
            delta_x = -delta_x
        if obj == 4:
            delta_y = -delta_y

      new_x, new_y = delta_x, delta_y
      canv.move(ball, new_x, new_y)
      canv.update()
      time.sleep(0.025)

      root.bind('<Right>', move_right)
      root.bind('<Left>', move_left)

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