經過一天多的奮戰，查閱文獻，參考別人的程式碼等等，完成了第一個面向物件的小專案，也深深體會到面向物件程式設計思想在遊戲程式設計中所扮演的角色。

附上程式碼，參考了別人的程式碼，以及對他們程式碼的完善，又加上了自己的一些東西，收穫頗深。

import pygame
import sys
import time
from pygame.locals import *
from random import randint
MOVE_SLEEP = 0.01
class MyTank:
 width = 600
 heights = 500
 speed = 10
 screen = 0
 myshells = []
 enemylist = []
 enemyshells = []
 grade = 0
 life = 3
 cnt = 0
 def startgame(self):
  pygame.init()
  self.screen = pygame.display.set_mode((self.width,self.heights),32)
  pygame.display.set_caption("bit tank")
  self.tank = Tank(self.screen,275,450)
  for i in range(6):
   self.enemylist.append(EnmeyTank(self.screen))
  while True:
   key = pygame.key.get_pressed()
   self.screen.fill((0,0))
   if key[K_LEFT]:
    self.tank.move('L')
   elif key[K_RIGHT]:
    self.tank.move('R')
   elif key[K_UP]:
    self.tank.move('U')
   elif key[K_DOWN]:
    self.tank.move('D')
   self.get_event()
   for shell in self.myshells:
    if shell.move() == True:
     self.myshells.remove(shell)
    shell.display()
    a = shell.hitTank()
    #子彈碰撞
    if a == True:
     if self.life >0:
      self.myshells.remove(shell)
      self.grade += 1
   #mytank碰撞
   if self.tank.live == True:
    if self.tank.hitTank():
     self.life -= 1
     if self.life <=0:
      self.tank.live =False
     else:self.tank = Tank(self.screen,450)
   #mytanke 碰撞子彈
   if self.tank.live == True:
    if self.tank.hitShell():
     self.life -= 1
     if self.life <=0:
      self.tank.live = False
     else:self.tank=Tank(self.screen,450)
   #敵方子彈擊中我方坦克
   # 遊戲結束
   if self.life <=0:
    self.gotGamePrint()
   for enemy in self.enemylist:
    enemy.move()
    print('move')
    enemy.display()
   # 新增敵方子彈
   self.cnt += 1
   if self.cnt % 100 ==0:
    for enemy in self.enemylist:
     self.enemyshells.append(enemy.fire())
   #判斷敵方子彈碰撞
   for enemyshell in self.enemyshells:
    f = enemyshell.move()
    enemyshell.display()
    if f:
     self.enemyshells.remove(enemyshell)
   if len(self.enemylist)<6:
    self.enemylist.append(EnmeyTank(self.screen))
   self.screen.blit(self.getGrade(),(5,5))
   self.tank.display()
   pygame.display.update()
   time.sleep(0.02)
 def get_event(self):
  for event in pygame.event.get():
   if event.type == KEYDOWN:
    if event.key == K_SPACE:
     self.myshells.append(self.tank.fire())
    if event.key == K_ESCAPE:
     pass
 def getGrade(self):
  text = pygame.font.Font('./font/msyhbd.ttc',20).render("分數:{} 生命:{}".format(self.grade,self.life),True,(0,255,0))
  return text
 def gotGamePrint(self):
  text = pygame.font.Font('./font/msyh.ttc',70).render('game over!',0))
  self.screen.blit(text,(100,200))
class Shell:
 width = 48
 height = 48
 live = True
 speed = 3
 def __init__(self,screen,tank):
  self.screen = screen
  self.image = pygame.image.load('./images/3.png')
  self.direction = tank.direction
  self.rect = self.image.get_rect()
  self.rect.left = tank.rect.left + (tank.width-self.width)/2.0+18
  # print(tank.rect.left,tank.width,self.width)
  self.rect.top = tank.rect.top + (tank.height - self.height)/2.0
  self.live = True
 def move(self):
  tag = self.isObstacle()
  if self.live == True:
   if self.direction == 'L' and self.direction not in tag:
    self.rect.left -= self.speed
   elif self.direction == 'R' and self.direction not in tag:
    self.rect.left += self.speed
   elif self.direction == 'U' and self.direction not in tag:
    self.rect.top -= self.speed
   elif self.direction == 'D' and self.direction not in tag:
    self.rect.top += self.speed
   else:
    pass
   if self.direction in tag:
    return True
   else:
    return False
  else:
   pass
 def display(self):
  # print(self.rect.left,self.rect.top)
  if self.live == True:
   self.screen.blit(self.image,self.rect)
 def isObstacle(self):
  tag = []
  if self.rect.left <=0:tag.append('L')
  if self.rect.left + self.width >= MyTank.width:tag.append('R')
  if self.rect.top <=0:tag.append('U')
  if self.rect.top + self.height >=MyTank.heights:tag.append('D')
  return tag
 def hitTank(self):
  hitList = pygame.sprite.spritecollide(self,MyTank.enemylist,False)
  for e in hitList:
   e.live = False
   MyTank.enemylist.remove(e)
   self.live = False
   return True
  return False
 def hitMytank(self):
  hitList = pygame.sprite.spritecollide(self,MyTank.tank,False)
  for e in hitList:
   e.live = False
   MyTank.life -= 1
   return True
class BaseTank:
 width = 50
 height = 50
 direction = 'U'
 live = True
 time = 0
 images = {}
 def __init__(self,left,top):
  self.screen = screen
  self.images['L'] = pygame.image.load("images/04.jpg")
  self.images['R'] = pygame.image.load("images/02.jpg")
  self.images['U'] = pygame.image.load("images/01.jpg")
  self.images['D'] = pygame.image.load("images/03.jpg")
  self.image = self.images[self.direction]
  self.rect = self.image.get_rect()
  self.rect.left = left
  self.rect.top = top
  self.live = True # 坦克是否被消滅
 def isObstacle(self):
  tag = []
  if self.rect.left <= 0: tag.append('L')
  if self.rect.left + self.width >= MyTank.width: tag.append('R')
  if self.rect.top <= 0: tag.append('U')
  if self.rect.top + self.height >= MyTank.heights: tag.append('D')
  return tag
 def display(self):
  if self.live == True:
   self.image = self.images[self.direction]
   self.screen.blit(self.image,self.rect)
 def fire(self):
  m = Shell(self.screen,self)
  return m
class Tank(BaseTank):
 images = {}
 def __init__(self,top):
  super().__init__(screen,450)
  self.screen = screen
  self.speed = 2
  self.images['L'] = pygame.image.load('./images/4.jpg')
  self.images['R'] = pygame.image.load('./images/2.jpg')
  self.images['U'] = pygame.image.load('./images/1.jpg')
  self.images['D'] = pygame.image.load('./images/3.jpg')
  self.image = self.images[self.direction]
  self.rect = self.image.get_rect()
  self.rect.top = top
  self.rect.left = left
 def move(self,direction):
  if self.live == True:
   tag = self.isObstacle()
   if direction == self.direction:
    if self.direction == 'L' and self.direction not in tag:
     self.rect.left -= self.speed
    elif self.direction == 'R' and self.direction not in tag:
     self.rect.left += self.speed
    elif self.direction == 'U' and self.direction not in tag:
     self.rect.top -= self.speed
    elif self.direction == 'D' and self.direction not in tag:
     self.rect.top += self.speed
    else:
     pass
   else:
    self.direction = direction
 def hitTank(self):
  hitList = pygame.sprite.spritecollide(self,False)
  for e in hitList:
   self.live = False
   return True
  return False
 def hitShell(self):
  hitlist = pygame.sprite.spritecollide(self,MyTank.enemyshells,False)
  for e in hitlist:
   self.live = False
   return True
  return False
class EnmeyTank(BaseTank):
 speed = 1
 def __init__(self,screen):
  super().__init__(screen,randint(1,5)*100,0)
  self.getdirection()
  self.step = 0
 def getdirection(self):
  self.direction = ['L','R','U','D'][randint(0,3)]
 def move(self):
  if self.live == True:
   if self.step == 0 or (self.direction in self.isObstacle()):
    self.getdirection()
    self.step = randint(0,200)
   else:
    tag = self.isObstacle()
    if self.direction == 'L' and self.direction not in tag:
     self.rect.left -= self.speed
    elif self.direction == 'R' and self.direction not in tag:
     self.rect.left += self.speed
    elif self.direction == 'U' and self.direction not in tag:
     self.rect.top -= self.speed
    elif self.direction == 'D' and self.direction not in tag:
     self.rect.top += self.speed
    else:
     pass
    self.step -= 1
if __name__ == '__main__':
 main = MyTank()
 main.startgame()

檔案主要有10張圖片和2個字型檔案，主坦克的四個形態，敵方坦克的四個形態，以及子彈等，10張圖片。

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