pygame实现俄罗斯方块游戏（AI篇2）

继续pygame实现俄罗斯方块游戏（AI篇1）的代码更新一、消除后才做评价上一篇我们是对方块

继续pygame实现俄罗斯方块游戏（AI篇1）的代码更新

一、消除后才做评价

但我们知道这种消除是不会产生空洞的。 所以我们要在计算评价的时候最好计算消除以后的评价。 我们只要在Matrix的函数里加一个do_clear函数来进行消除

def do_clear(self):
 for i in range(self.rows-1,-1,-1):
 if sum(self.cols*i:self.cols*(i+1))==self.cols:
 self.matrix[self.cols:self.cols*(i+1)]=self.matrix[0:self.cols*i]

然后在clone_matrix.fill_block(center_shape, xdiff=xdiff, ydiff=max_yindex)之后加一行

clone_matrix.do_clear()

现在机器人比以前聪明了一点，但是还有问题，只要有下面两个问题：

1.当有更好的消除方案时，机器人并没有选择更好的方案（比如可以消除两行，但是机器人选择了消除一行）。 2.人玩的时候会避免空的列两边堆叠太高，而是优先在远离空的列附近填。

下面我们进行这些修改。

二、消除时考虑获得更高分

我们在Matrix的do_clear函数里增加一个clear_num来计算消除了多少行

def do_clear(self):
 clear_num = 0
 for i in range(self.rows-1,-1,-1):
 if sum(self.data[self.cols*i:self.cols*(i+1)])==self.cols:
 self.data[self.cols:self.cols*(i+1)]=self.data[0:self.cols*i]
 clear_num+=1
 return clear_num

在计算的地方加这样两行

clear_num=clone_matrix.do_clear()
score += clear_num * 5

这样每多消除一行会多得到5分，会激励机器人在单次消除中去寻找更好的消除方案。

三、避免空列附近的填塞

首先空列的定义，我们可以认为像下面的图中，1的位置还不能算完全的空列，因为列右侧高起的是两格，拯救的机会比2处大很多，2处两边都已经高起3格，再这样下去只有等长条了。

所以我们在Matrix里加一个空列的获取函数

def get_empty_col(self):
 miny_arr=[]
 for x in range(self.cols):
 miny=19
 for y in range(self.rows):
 miny=y
 if self.get_val(x,y) == 1:break
 miny_arr.append(miny)
 empty_arr=[]
 if miny_arr[1] - miny_arr[0] > 2: empty_arr.append((self.cols,miny_arr[1] - miny_arr[0]))
 if miny_arr[self.cols-2] - miny_arr[self.cols-1] > 2: empty_arr.append((miny_arr[self.cols-2] - miny_arr[self.cols-1],self.cols))
 for x in range(1,self.cols-1):
 if miny_arr[x-1]-miny_arr[x]>2 or miny_arr[x+1]-miny_arr[x]>2: empty_arr.append((miny_arr[x-1]-miny_arr[x],miny_arr[x+1]-miny_arr[x]))
 return empty_arr

在AIPlayer里增加一个get_cost_of_emptycol函数

def get_cost_of_emptycol(self, empty_arr):
 cost = 0
 for l,r in empty_arr:
 if l>2 and r>2: cost += (l+r)*2
 elif l>2: cost += l
 else: cost += r
 return cost

在计算分数的地方增加两行程序

empty_arr = clone_matrix.get_empty_col()
score -= self.get_cost_of_emptycol(empty_arr)

现在机器人又厉害了一些，基本上没有比较糟糕的情况下，机器人已经不会gameover了

四、已成空洞上方位置的避免

比如下图

我们一定会尽可能避免在红框的位置堆叠，因为这样有助于我们消除空洞上方的方块后可以尽快进入空洞进行新的消除，但是机器人现在还没有这个考虑，所以我们在Matrix里继续增加一个空洞上方方块数的计算。 函数实现如下： 

def get_block_above_hole(self):
 blocks=0
 for x in range(0,self.cols):
 for y in range(1,self.rows):
 if self.get_val(x,y) == 0 and self.get_val(x,y-1) == 1: 
 blocks += sum(self.data[x:(y*self.cols+x):self.cols])
 return blocks

在计算分数的地方我们再加一行

score -= clone_matrix.get_block_above_hole()

这样机器人就会考虑让空洞上方的方块尽可能少。

附下目前的完整程序。

# -*- coding=utf-8 -*-
import random
import pygame
from pygame.locals import KEYDOWN,K_LEFT,K_RIGHT,K_UP,K_DOWN,K_SPACE
import pickle,os

ROW_COUNT=20
COL_COUNT=10
SCORE_MAP=(100,300,800,1600)

class Matrix(object):
 rows = 0
 cols = 0
 data = []
 def __init__(self, rows, cols, data=None):
 self.rows = rows
 self.cols = cols 
 if data is None: data = [0 for i in range(rows*cols)]
 self.data = data

 def set_val(self, x, y, val):
 self.data[y*self.cols+x] = val

 def get_val(self, x, y):
 return self.data[y*self.cols+x]
 
 def cross_block(self, rect_arr, xdiff=0, ydiff=0):
 for x,y in rect_arr:
 #if x+xdiff>=0 and x+xdiff<self.cols and y+ydiff>=0 and y+ydiff<self.rows:
 if self.get_val(x+xdiff,y+ydiff) == 1: return True
 return False

 def get_block_above_hole(self):
 blocks=0
 for x in range(0,self.cols):
 for y in range(1,self.rows):
 if self.get_val(x,y) == 0 and self.get_val(x,y-1) == 1: 
 blocks += sum(self.data[x:(y*self.cols+x):self.cols])

 return blocks

 def get_hole_number(self):
 hole_num=0
 for x in range(0,self.cols):
 for y in range(1,self.rows):
 if self.get_val(x,y) == 0 and self.get_val(x,y-1) == 1: 
 hole_num+=1
 return hole_num

 def clone(self):
 clone_matrix=Matrix(self.rows, self.cols, list(self.data))
 return clone_matrix

 def fill_block(self, rect_arr, xdiff=0, ydiff=0):
 for x,y in rect_arr:
 self.set_val(x+xdiff,y+ydiff, 1)

 def do_clear(self):
 clear_num = 0
 for i in range(self.rows-1,-1,-1):
 if sum(self.data[self.cols*i:self.cols*(i+1)])==self.cols:
 self.data[self.cols:self.cols*(i+1)]=self.data[0:self.cols*i]
 clear_num+=1
 return clear_num

 def get_empty_col(self):
 miny_arr=[]
 for x in range(self.cols):
 miny=19
 for y in range(self.rows):
 miny=y
 if self.get_val(x,y) == 1:break
 miny_arr.append(miny)
 empty_arr=[]
 if miny_arr[1] - miny_arr[0] > 2: empty_arr.append((self.cols,miny_arr[1] - miny_arr[0]))
 if miny_arr[self.cols-2] - miny_arr[self.cols-1] > 2: empty_arr.append((miny_arr[self.cols-2] - miny_arr[self.cols-1],self.cols))
 for x in range(1,self.cols-1):
 if miny_arr[x-1]-miny_arr[x]>2 or miny_arr[x+1]-miny_arr[x]>2: empty_arr.append((miny_arr[x-1]-miny_arr[x],miny_arr[x+1]-miny_arr[x]))
 return empty_arr

 def print_matrix(self):
 for i in range(self.rows):
 print self.data[self.cols*i:self.cols*(i+1)]

class Player(object):
 auto_mode=False
 def __init__(self):
 pass
 def run(self, panel): 
 pass

class HumanPlayer(Player):
 def __init__(self):
 super(Player, self).__init__()

class AIPlayer(Player):
 cal_block_id=-1 
 ctl_arr=[] # control arr, 1＝change、2＝left、3＝right、4＝down
 auto_mode=True
 ai_diff_ticks = 100 #timespan between two controls
 
 def __init__(self):
 super(Player, self).__init__()
 self.ctl_ticks = pygame.time.get_ticks() + self.ai_diff_ticks

 def get_cost_of_emptycol(self, empty_arr):
 cost = 0
 for l,r in empty_arr:
 if l>2 and r>2: cost += (l+r)*2
 elif l>2: cost += l
 else: cost += r
 return cost

 def cal_best_arr(self, panel):
 matrix = panel.get_rect_matrix()
 cur_shape_id = panel.moving_block.shape_id
 shape_num = panel.moving_block.shape_num
 max_score = -10000
 best_arr = []
 for i in range(shape_num):
 tmp_shape_id = cur_shape_id + i
 if tmp_shape_id >= shape_num: tmp_shape_id = tmp_shape_id % shape_num
 tmp_shape = panel.moving_block.get_shape(sid=tmp_shape_id)
 center_shape = []
 for x,y in tmp_shape: center_shape.append((x+COL_COUNT/2-2,y-2))
 minx = COL_COUNT
 maxx = 0
 miny = ROW_COUNT
 maxy = -2
 for x,y in center_shape:
 if x<minx: minx = x
 if x>maxx: maxx = x
 if y<miny: miny = y
 if y>maxy: maxy = y

 for xdiff in range(-minx,COL_COUNT-maxx): 
 arr = [1 for _ in range(i)] 
 if xdiff < 0: [arr.append(2) for _ in range(-xdiff)]
 if xdiff > 0: [arr.append(3) for _ in range(xdiff)]

 max_yindex = -miny
 for yindex in range(-miny, ROW_COUNT-maxy):
 if matrix.cross_block(center_shape, xdiff=xdiff, ydiff=yindex):
 break
 max_yindex = yindex
 score = sum([y+max_yindex for x,y in center_shape])

 # clone matrix and fill new block to calculate holes
 clone_matrix = matrix.clone()
 clone_matrix.fill_block(center_shape, xdiff=xdiff, ydiff=max_yindex)
 clear_num = clone_matrix.do_clear()
 score -= clone_matrix.get_block_above_hole()
 empty_arr = clone_matrix.get_empty_col()
 score -= self.get_cost_of_emptycol(empty_arr)
 score += clear_num * 5
 score -= clone_matrix.get_hole_number() * COL_COUNT

 if score > max_score: 
 max_score = score
 best_arr = arr
 self.ctl_arr = best_arr+[4]

 def run(self, panel):
 if pygame.time.get_ticks() < self.ctl_ticks: return
 self.ctl_ticks += self.ai_diff_ticks
 if panel.block_id == self.cal_block_id: # block_id not change
 if len(self.ctl_arr)>0:
 ctl = self.ctl_arr.pop(0)
 if ctl == 1: panel.change_block()
 if ctl == 2: panel.control_block(-1,0)
 if ctl == 3: panel.control_block(1,0)
 if ctl == 4:
 flag = panel.move_block()
 while flag==1: 
 flag = panel.move_block()

 else: # block_id is new
 self.cal_block_id = panel.block_id
 self.cal_best_arr(panel)
 

class RectInfo(object):
 def __init__(self, x, y, color):
 self.x = x
 self.y = y
 self.color = color

class HintBox(object):
 next_block=None
 def __init__(self, bg, block_size, position):
 self._bg=bg;
 self._x,self._y,self._width,self._height=position
 self._block_size=block_size
 self._bgcolor=[0,0,0]

 def take_block(self):
 block = self.next_block
 if block is None: # make first block
 block = create_block()
 
 self.next_block = create_block()
 return block

 def paint(self):
 mid_x=self._x+self._width/2
 pygame.draw.line(self._bg,self._bgcolor,[mid_x,self._y],[mid_x,self._y+self._height],self._width) 
 bz=self._block_size
 
 if self.next_block:
 arr = self.next_block.get_rect_arr()
 minx,miny=arr[0]
 maxx,maxy=arr[0]
 for x,y in arr:
 if x<minx: minx=x
 if x>maxx: maxx=x
 if y<miny: miny=y
 if y>maxy: maxy=y
 w=(maxx-minx)*bz
 h=(maxy-miny)*bz
 
 cx=self._width/2-w/2-minx*bz-bz/2 
 cy=self._height/2-h/2-miny*bz-bz/2

 for rect in arr:
 x,y=rect
 pygame.draw.line(self._bg,self.next_block.color,[self._x+x*bz+cx+bz/2,self._y+cy+y*bz],[self._x+x*bz+cx+bz/2,self._y+cy+(y+1)*bz],bz)
 pygame.draw.rect(self._bg,[255,255,255],[self._x+x*bz+cx,self._y+y*bz+cy,bz+1,bz+1],1)

class ScoreBox(object):
 total_score = 0
 high_score = 0
 db_file = 'tetris.db'
 def __init__(self, bg, block_size, position):
 self._bg=bg;
 self._x,self._y,self._width,self._height=position
 self._block_size=block_size
 self._bgcolor=[0,0,0]
 
 if os.path.exists(self.db_file): self.high_score = pickle.load(open(self.db_file,'rb'))

 def paint(self):
 myfont = pygame.font.Font(None,36)
 white = 255,255,255
 textImage = myfont.render('High: %06d'%(self.high_score), True, white)
 self._bg.blit(textImage, (self._x,self._y))
 textImage = myfont.render('Score:%06d'%(self.total_score), True, white)
 self._bg.blit(textImage, (self._x,self._y+40))

 def add_score(self, score):
 self.total_score += score
 if self.total_score > self.high_score:
 self.high_score=self.total_score
 pickle.dump(self.high_score, open(self.db_file,'wb+'))

class Panel(object): 
 block_id=0
 rect_arr=[] 
 moving_block=None 
 hint_box=None
 score_box=None
 def __init__(self,bg, block_size, position):
 self._bg=bg;
 self._x,self._y,self._width,self._height=position
 self._block_size=block_size
 self._bgcolor=[0,0,0]
 
 def get_rect_matrix(self):
 matrix = Matrix(ROW_COUNT, COL_COUNT)
 for rect_info in self.rect_arr:
 matrix.set_val(rect_info.x, rect_info.y, 1)
 return matrix

 def add_block(self,block):
 for x,y in block.get_rect_arr():
 self.rect_arr.append(RectInfo(x,y, block.color))

 def create_move_block(self):
 self.block_id+=1
 block = self.hint_box.take_block()
 #block = create_block()
 block.move(COL_COUNT/2-2,-2) # move block to top center
 self.moving_block=block

 def check_overlap(self, diffx, diffy, check_arr=None):
 if check_arr is None: check_arr = self.moving_block.get_rect_arr()
 for x,y in check_arr:
 for rect_info in self.rect_arr:
 if x+diffx==rect_info.x and y+diffy==rect_info.y:
 return True
 return False

 def control_block(self, diffx, diffy):
 if self.moving_block.can_move(diffx,diffy) and not self.check_overlap(diffx, diffy):
 self.moving_block.move(diffx,diffy)

 def change_block(self):
 if self.moving_block:
 new_arr = self.moving_block.change()
 if new_arr and not self.check_overlap(0, 0, check_arr=new_arr): 
 self.moving_block.rect_arr=new_arr


 def move_block(self):
 if self.moving_block is None: create_move_block()
 if self.moving_block.can_move(0,1) and not self.check_overlap(0,1): 
 self.moving_block.move(0,1)
 return 1
 else:
 self.add_block(self.moving_block)
 self.check_clear()

 for rect_info in self.rect_arr:
 if rect_info.y<0: return 9 # gameover
 self.create_move_block()
 return 2

 def check_clear(self):
 tmp_arr = [[] for i in range(20)]
 
 for rect_info in self.rect_arr:
 if rect_info.y<0: return
 tmp_arr[rect_info.y].append(rect_info)

 clear_num=0
 clear_lines=set([])
 y_clear_diff_arr=[[] for i in range(20)]
 
 for y in range(19,-1,-1):
 if len(tmp_arr[y])==10:
 clear_lines.add(y)
 clear_num += 1
 y_clear_diff_arr[y] = clear_num

 if clear_num>0:
 new_arr=[]
 
 for y in range(19,-1,-1):
 if y in clear_lines: continue
 tmp_row = tmp_arr[y]
 y_clear_diff=y_clear_diff_arr[y]
 for rect_info in tmp_row:
 #new_arr.append([x,y+y_clear_diff])
 new_arr.append(RectInfo(rect_info.x, rect_info.y+y_clear_diff, rect_info.color))
 
 self.rect_arr = new_arr
 score = SCORE_MAP[clear_num-1]
 self.score_box.add_score(score)


 def paint(self):
 mid_x=self._x+self._width/2
 pygame.draw.line(self._bg,self._bgcolor,[mid_x,self._y],[mid_x,self._y+self._height],self._width) # 用一个粗线段来填充背景
 
 bz=self._block_size
 for rect_info in self.rect_arr:
 x=rect_info.x
 y=rect_info.y
 pygame.draw.line(self._bg,rect_info.color,[self._x+x*bz+bz/2,self._y+y*bz],[self._x+x*bz+bz/2,self._y+(y+1)*bz],bz)
 pygame.draw.rect(self._bg,[255,255,255],[self._x+x*bz,self._y+y*bz,bz+1,bz+1],1)
 
 if self.move_block:
 for rect in self.moving_block.get_rect_arr():
 x,y=rect
 pygame.draw.line(self._bg,self.moving_block.color,[self._x+x*bz+bz/2,self._y+y*bz],[self._x+x*bz+bz/2,self._y+(y+1)*bz],bz)
 pygame.draw.rect(self._bg,[255,255,255],[self._x+x*bz,self._y+y*bz,bz+1,bz+1],1)

class Block(object):
 sx=0
 sy=0
 def __init__(self):
 self.rect_arr=[]

 def get_rect_arr(self): 
 return self.rect_arr

 def move(self,xdiff,ydiff):
 self.sx+=xdiff
 self.sy+=ydiff
 self.new_rect_arr=[]
 for x,y in self.rect_arr:
 self.new_rect_arr.append((x+xdiff,y+ydiff))
 self.rect_arr=self.new_rect_arr

 def can_move(self,xdiff,ydiff):
 for x,y in self.rect_arr:
 if y+ydiff>=20: return False
 if x+xdiff<0 or x+xdiff>=10: return False
 return True

 def change(self):
 self.shape_id+=1 
 if self.shape_id >= self.shape_num: 
 self.shape_id=0

 arr = self.get_shape()
 new_arr = []
 for x,y in arr:
 if x+self.sx<0 or x+self.sx>=10: 
 self.shape_id -= 1
 if self.shape_id < 0: self.shape_id = self.shape_num - 1
 return None 

 new_arr.append([x+self.sx,y+self.sy])

 return new_arr

class LongBlock(Block):
 shape_id=0
 shape_num=2
 def __init__(self, n=None): 
 super(LongBlock, self).__init__()
 if n is None: n=random.randint(0,1)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(50,180,50)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 return [(1,0),(1,1),(1,2),(1,3)] if sid==0 else [(0,2),(1,2),(2,2),(3,2)]

class SquareBlock(Block): 
 shape_id=0
 shape_num=1
 def __init__(self, n=None):
 super(SquareBlock, self).__init__()
 self.rect_arr=self.get_shape()
 self.color=(0,0,255)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 return [(1,1),(1,2),(2,1),(2,2)]

class ZBlock(Block): 
 shape_id=0
 shape_num=2
 def __init__(self, n=None):
 super(ZBlock, self).__init__()
 if n is None: n=random.randint(0,1)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(30,200,200)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 return [(2,0),(2,1),(1,1),(1,2)] if sid==0 else [(0,1),(1,1),(1,2),(2,2)]

class SBlock(Block):
 shape_id=0
 shape_num=2
 def __init__(self, n=None):
 super(SBlock, self).__init__()
 if n is None: n=random.randint(0,1)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(255,30,255)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 return [(1,0),(1,1),(2,1),(2,2)] if sid==0 else [(0,2),(1,2),(1,1),(2,1)]

class LBlock(Block): 
 shape_id=0
 shape_num=4
 def __init__(self, n=None):
 super(LBlock, self).__init__()
 if n is None: n=random.randint(0,3)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(200,200,30)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 if sid==0: return [(1,0),(1,1),(1,2),(2,2)]
 elif sid==1: return [(0,1),(1,1),(2,1),(0,2)]
 elif sid==2: return [(0,0),(1,0),(1,1),(1,2)]
 else: return [(0,1),(1,1),(2,1),(2,0)]

class JBlock(Block):
 shape_id=0
 shape_num=4
 def __init__(self, n=None):
 super(JBlock, self).__init__()
 if n is None: n=random.randint(0,3)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(200,100,0)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 if sid==0: return [(1,0),(1,1),(1,2),(0,2)]
 elif sid==1: return [(0,1),(1,1),(2,1),(0,0)]
 elif sid==2: return [(2,0),(1,0),(1,1),(1,2)]
 else: return [(0,1),(1,1),(2,1),(2,2)]

class TBlock(Block):
 shape_id=0
 shape_num=4
 def __init__(self, n=None):
 super(TBlock, self).__init__()
 if n is None: n=random.randint(0,3)
 self.shape_id=n
 self.rect_arr=self.get_shape()
 self.color=(255,0,0)

 def get_shape(self, sid=None):
 if sid is None: sid = self.shape_id
 if sid==0: return [(0,1),(1,1),(2,1),(1,2)]
 elif sid==1: return [(1,0),(1,1),(1,2),(0,1)]
 elif sid==2: return [(0,1),(1,1),(2,1),(1,0)]
 else: return [(1,0),(1,1),(1,2),(2,1)]

def create_block():
 n = random.randint(0,18)
 if n==0: return SquareBlock(n=0)
 elif n==1 or n==2: return LongBlock(n=n-1)
 elif n==3 or n==4: return ZBlock(n=n-3)
 elif n==5 or n==6: return SBlock(n=n-5)
 elif n>=7 and n<=10: return LBlock(n=n-7)
 elif n>=11 and n<=14: return JBlock(n=n-11)
 else: return TBlock(n=n-15)

def run():
 pygame.init()
 space=30
 main_block_size=30
 main_panel_width=main_block_size*COL_COUNT
 main_panel_height=main_block_size*ROW_COUNT
 screencaption = pygame.display.set_caption('Tetris')
 screen = pygame.display.set_mode((main_panel_width+160+space*3,main_panel_height+space*2)) 
 main_panel=Panel(screen,main_block_size,[space,space,main_panel_width,main_panel_height])
 hint_box=HintBox(screen,main_block_size,[main_panel_width+space+space,space,160,160])
 score_box=ScoreBox(screen,main_block_size,[main_panel_width+space+space,160+space*2,160,160])
 
 main_panel.hint_box=hint_box
 main_panel.score_box=score_box

 pygame.key.set_repeat(200, 30)
 main_panel.create_move_block()

 diff_ticks = 300 
 ticks = pygame.time.get_ticks() + diff_ticks

 player = AIPlayer()

 pause=0
 game_state = 1 # game status 1.normal 2.gameover
 while True:
 for event in pygame.event.get():
 if event.type == pygame.QUIT:
 pygame.quit()
 exit()
 if event.type == KEYDOWN:
 if event.key==97: pause=1-pause # press a to pause
 if event.key==112: # for debug where press p
 main_panel.get_rect_matrix().print_matrix()
 if player.auto_mode:continue
 if event.type == KEYDOWN:
 if event.key == K_LEFT: main_panel.control_block(-1,0)
 if event.key == K_RIGHT: main_panel.control_block(1,0)
 if event.key == K_UP: main_panel.change_block()
 if event.key == K_DOWN: main_panel.control_block(0,1)
 if event.key == K_SPACE:
 flag = main_panel.move_block()
 while flag==1: 
 flag = main_panel.move_block()
 if flag == 9: game_state = 2
 
 screen.fill((100,100,100)) # make background gray
 main_panel.paint() 
 hint_box.paint() 
 score_box.paint() 

 if game_state == 2:
 myfont = pygame.font.Font(None,30)
 white = 255,255,255
 textImage = myfont.render("Game over", True, white)
 screen.blit(textImage, (160,190))

 pygame.display.update() 

 if pause==1: continue
 if game_state == 1: player.run(main_panel)
 if game_state == 1 and pygame.time.get_ticks() >= ticks:
 ticks+=diff_ticks
 if main_panel.move_block()==9: game_state = 2 # gameover

run()

这篇先到这里，下篇继续优化。