Python -- pygame（球球大作战）_球球大作战python代码

例：球球大作战：（大球吃小球,代码如下：）

from random import randint,randrange
import pygame
from math import sqrt,pi


class Ball(object):
    def __init__(self, center, color, radius, sx, sy):
        self._center = center
        self._color = color
        self._radius = radius
        self._sx = sx
        self._sy = sy

    @property
    def center(self):
        return self._center

    @property
    def radius(self):
        return self._radius

    @radius.setter
    def 
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