基于MFC实现贪吃蛇小游戏

int random();//生成随机点
void SetBean();//产生食物
void DrawBean();//画出食物
void GameStart();//启动游戏
void DrawSnake();//画蛇
void SnakeMove();//实现蛇的移动
virtual BOOL PreTranslateMessage(MSG* pMsg);//控制移动方向
void ShowScores();//计算得分情况

void CTest2Dlg::OnBnClickedButtonStart()
{
 // TODO: 在此添加控件通知处理程序代码
 MessageBox(_T("Game start！"));
 SetTimer(1, 500, NULL);//定时 
}

void CTest2Dlg::OnBnClickedButtonPause()
{
 // TODO: 在此添加控件通知处理程序代码
 KillTimer(1);
 AfxMessageBox(_T("Game pause!"));
}

void CTest2Dlg::OnBnClickedButtonExit()
{
 // TODO: 在此添加控件通知处理程序代码
 AfxMessageBox(_T("Exit!"));
 exit(0);
}

if (pMsg->message == WM_KEYDOWN)
 {
  switch (pMsg->wParam)
  {
  case VK_UP:
   s_snake.Direction(CPoint(0, -1));
   break;
  case VK_DOWN:
   s_snake.Direction(CPoint(0, 1));
   break;
  case VK_LEFT:
   s_snake.Direction(CPoint(-1, 0));
   break;
  case VK_RIGHT:
   s_snake.Direction(CPoint(1, 0));
   break;
  default:
   break;
  }
 }

int CTest2Dlg::random()
{
 // TODO: 在此处添加实现代码.
 srand(time(NULL));//程序每次运行产生不同的随机数序列
 long x = rand() % 20;//随机生成坐标x
 long y = rand() % 20;//随机生成坐标y 
 return x;
 return y;
}

void CTest2Dlg::SetBean()
{
 // TODO: 在此处添加实现代码.
 s_bean.x = random();//随机生成坐标x
 s_bean.y = random();//随机生成坐标y 
 while (s_snake.onself(s_bean))
 {
  s_bean.x = random();
  s_bean.y = random();
 }
}

void CTest2Dlg::DrawBean()
{
 // TODO: 在此处添加实现代码.
 CClientDC dc(this);
 CBrush red(RGB(255, 0, 0));//红色标识食物
 dc.SelectObject(red);
 dc.Rectangle(s_bean.x * length, s_bean.y * length, (s_bean.x + 1) * length, (s_bean.y + 1) * length);//画出食物
}

void CTest2Dlg::DrawSnake()
{
 // TODO: 在此处添加实现代码.
 CClientDC dc(this);
 CBrush green(RGB(0, 255, 0));//用绿色标识蛇身
 dc.SelectObject(green);
 CList<CPoint>* pSnake =s_snake.Getlength();//获取蛇身的位置
 //遍历并画出蛇
 POSITION p = pSnake->GetHeadPosition();
 while (p)
 {
  CPoint point = pSnake->GetNext(p);
  dc.Rectangle(point.x * length, point.y * length, (point.x + 1) * length, (point.y + 1) * length);//画出蛇

 }
} 

bool snake::Move(CPoint bean)
{
 CPoint newHead = s_snakelength.GetHead() + s_direction;//计算蛇头新位置
 if (onself(newHead))//如果撞到蛇身
  return false;
 else if (newHead.x < 0 || newHead.x >= 30 || newHead.y < 0 || newHead.y >= 30 )//如果撞到墙
 {
  return false;
 }
 if (newHead != bean)//如果没吃到食物
 {
  s_snakelength.RemoveTail();//删除蛇尾
 }
 s_snakelength.AddHead(newHead);//将新蛇头加到最前面
 return true;
}

void CTest2Dlg::SnakeMove()
{
 CClientDC dc(this);
 CPoint tail = s_snake.Getlength()->GetTail();//获取移动前的蛇尾
 if (s_snake.Move(s_bean))//如果移动成功
 {
  CPoint head = s_snake.Getlength()->GetHead();
  CBrush green(RGB(0, 255, 0));
  CBrush* old = dc.SelectObject(&green);
  dc.Rectangle(head.x * length, head.y * length, (head.x + 1) * length, (head.y + 1) * length);
  dc.SelectObject(old);
  if (head == s_bean)//如果吃掉食物则产生新的食物
  {
   SetBean();
   DrawBean();
   SetTimer(1, 1000 / ++s_score, NULL);
  }
  else
  {   //删掉原来的蛇尾
   CPen white(PS_SOLID, 1, RGB(255, 255, 255));
   dc.SelectObject(&white);
   dc.Rectangle(tail.x * length, tail.y * length, (tail.x + 1) * length, (tail.y + 1) * length);

  }
 }
 else
 {
  KillTimer(1);
  ShowScores();
  MessageBox(_T("Game over!"));
  exit(0);
 }
}

if (head == s_bean)//如果吃掉食物则产生新的食物
  {
   SetBean();
   DrawBean();
   my_score= my_score +1;
   SetTimer(1, 1000, NULL);
   CString s;
   s.Format(_T("%d"), my_score);//显示得分
   Myscore.SetWindowText(s);
  }