col = (255, 0, 0)
surf.fill((255, 255, 255))
pygame.gfxdraw.aacircle(surf, x, y, 30, col)
pygame.gfxdraw.filled_circle(surf, x, y, 30, col)

while True:
 for event in pygame.event.get():
 if event.type == QUIT:
 sys.exit()
 elif event.type == MOUSEBUTTONDOWN:
 pressed_array = pygame.mouse.get_pressed()
 if pressed_array[0]: # 鼠标左键点击
  mouse_pos = pygame.mouse.get_pos()
  click_point = _get_clickpoint(mouse_pos)

Chessman = namedtuple('Chessman', 'Name Value Color')
Point = namedtuple('Point', 'X Y')
 
BLACK_CHESSMAN = Chessman('黑子', 1, (45, 45, 45))
WHITE_CHESSMAN = Chessman('白子', 2, (219, 219, 219))
 
offset = [(1, 0), (0, 1), (1, 1), (1, -1)]
 
 
class Checkerboard:
 def __init__(self, line_points):
 self._line_points = line_points
 self._checkerboard = [[0] * line_points for _ in range(line_points)]
 
 def _get_checkerboard(self):
 return self._checkerboard
 
 checkerboard = property(_get_checkerboard)
 
 # 判断是否可落子
 def can_drop(self, point):
 return self._checkerboard[point.Y][point.X] == 0
 
 def drop(self, chessman, point):
 """
 落子
 :param chessman: 黑子/白子
 :param point:落子位置
 :return:若该子落下之后即可获胜，则返回获胜方，否则返回 None
 """
 print(f'{chessman.Name} ({point.X}, {point.Y})')
 self._checkerboard[point.Y][point.X] = chessman.Value
 
 if self._win(point):
 print(f'{chessman.Name}获胜')
 return chessman
 
 # 判断是否赢了
 def _win(self, point):
 cur_value = self._checkerboard[point.Y][point.X]
 for os in offset:
 if self._get_count_on_direction(point, cur_value, os[0], os[1]):
 return True
 
 def _get_count_on_direction(self, point, value, x_offset, y_offset):
 count = 1
 for step in range(1, 5):
 x = point.X + step * x_offset
 y = point.Y + step * y_offset
 if 0 <= x < self._line_points and 0 <= y < self._line_points and self._checkerboard[y][x] == value:
 count += 1
 else:
 break
 for step in range(1, 5):
 x = point.X - step * x_offset
 y = point.Y - step * y_offset
 if 0 <= x < self._line_points and 0 <= y < self._line_points and self._checkerboard[y][x] == value:
 count += 1
 else:
 break
 
 return count >= 5