spaceout.cpp

来自「《24小时教会你游戏编程》上的源码」· C++ 代码 · 共 392 行

//-----------------------------------------------------------------
// Space Out Application
// C++ Source - SpaceOut.cpp
//-----------------------------------------------------------------

//-----------------------------------------------------------------
// Include Files
//-----------------------------------------------------------------
#include "SpaceOut.h"

//-----------------------------------------------------------------
// Game Engine Functions
//-----------------------------------------------------------------
BOOL GameInitialize(HINSTANCE hInstance)
{
  // Create the game engine
  _pGame = new GameEngine(hInstance, TEXT("Space Out"),
    TEXT("Space Out"), IDI_SPACEOUT, IDI_SPACEOUT_SM, 600, 450);
  if (_pGame == NULL)
    return FALSE;

  // Set the frame rate
  _pGame->SetFrameRate(30);

  // Store the instance handle
  _hInstance = hInstance;

  return TRUE;
}

void GameStart(HWND hWindow)
{
  // Seed the random number generator
  srand(GetTickCount());

  // Create the offscreen device context and bitmap
  _hOffscreenDC = CreateCompatibleDC(GetDC(hWindow));
  _hOffscreenBitmap = CreateCompatibleBitmap(GetDC(hWindow),
    _pGame->GetWidth(), _pGame->GetHeight());
  SelectObject(_hOffscreenDC, _hOffscreenBitmap);

  // Create and load the bitmaps
  HDC hDC = GetDC(hWindow);
  _pDesertBitmap = new Bitmap(hDC, IDB_DESERT, _hInstance);
  _pCarBitmap = new Bitmap(hDC, IDB_CAR, _hInstance);
  _pSmCarBitmap = new Bitmap(hDC, IDB_SMCAR, _hInstance);
  _pMissileBitmap = new Bitmap(hDC, IDB_MISSILE, _hInstance);
  _pBlobboBitmap = new Bitmap(hDC, IDB_BLOBBO, _hInstance);
  _pBMissileBitmap = new Bitmap(hDC, IDB_BMISSILE, _hInstance);
  _pJellyBitmap = new Bitmap(hDC, IDB_JELLY, _hInstance);
  _pJMissileBitmap = new Bitmap(hDC, IDB_JMISSILE, _hInstance);
  _pTimmyBitmap = new Bitmap(hDC, IDB_TIMMY, _hInstance);
  _pTMissileBitmap = new Bitmap(hDC, IDB_TMISSILE, _hInstance);
  _pSmExplosionBitmap = new Bitmap(hDC, IDB_SMEXPLOSION, _hInstance);
  _pLgExplosionBitmap = new Bitmap(hDC, IDB_LGEXPLOSION, _hInstance);
  _pGameOverBitmap = new Bitmap(hDC, IDB_GAMEOVER, _hInstance);

  // Create the starry background
  _pBackground = new StarryBackground(600, 450);

  // Play the background music
  _pGame->PlayMIDISong(TEXT("Music.mid"));

  // Start the game
  NewGame();
}

void GameEnd()
{
  // Close the MIDI player for the background music
  _pGame->CloseMIDIPlayer();

  // Cleanup the offscreen device context and bitmap
  DeleteObject(_hOffscreenBitmap);
  DeleteDC(_hOffscreenDC);  

  // Cleanup the bitmaps
  delete _pDesertBitmap;
  delete _pCarBitmap;
  delete _pSmCarBitmap;
  delete _pMissileBitmap;
  delete _pBlobboBitmap;
  delete _pBMissileBitmap;
  delete _pJellyBitmap;
  delete _pJMissileBitmap;
  delete _pTimmyBitmap;
  delete _pTMissileBitmap;
  delete _pSmExplosionBitmap;
  delete _pLgExplosionBitmap;
  delete _pGameOverBitmap;

  // Cleanup the background
  delete _pBackground;

  // Cleanup the sprites
  _pGame->CleanupSprites();

  // Cleanup the game engine
  delete _pGame;
}

void GameActivate(HWND hWindow)
{
  // Resume the background music
  _pGame->PlayMIDISong(TEXT(""), FALSE);
}

void GameDeactivate(HWND hWindow)
{
  // Pause the background music
  _pGame->PauseMIDISong();
}

void GamePaint(HDC hDC)
{
  // Draw the background
  _pBackground->Draw(hDC);

  // Draw the desert bitmap
  _pDesertBitmap->Draw(hDC, 0, 371);

  // Draw the sprites
  _pGame->DrawSprites(hDC);

  // Draw the score
  TCHAR szText[64];
  RECT  rect = { 460, 0, 510, 30 };
  wsprintf(szText, "%d", _iScore);
  SetBkMode(hDC, TRANSPARENT);
  SetTextColor(hDC, RGB(255, 255, 255));
  DrawText(hDC, szText, -1, &rect, DT_SINGLELINE | DT_RIGHT | DT_VCENTER);

  // Draw the number of remaining lives (cars)
  for (int i = 0; i < _iNumLives; i++)
    _pSmCarBitmap->Draw(hDC, 520 + (_pSmCarBitmap->GetWidth() * i),
      10, TRUE);

  // Draw the game over message, if necessary
  if (_bGameOver)
    _pGameOverBitmap->Draw(hDC, 190, 149, TRUE);
}

void GameCycle()
{
  if (!_bGameOver)
  {
    // Randomly add aliens
    if ((rand() % _iDifficulty) == 0)
      AddAlien();

    // Update the background
    _pBackground->Update();

    // Update the sprites
    _pGame->UpdateSprites();

    // Obtain a device context for repainting the game
    HWND  hWindow = _pGame->GetWindow();
    HDC   hDC = GetDC(hWindow);

    // Paint the game to the offscreen device context
    GamePaint(_hOffscreenDC);

    // Blit the offscreen bitmap to the game screen
    BitBlt(hDC, 0, 0, _pGame->GetWidth(), _pGame->GetHeight(),
      _hOffscreenDC, 0, 0, SRCCOPY);

    // Cleanup
    ReleaseDC(hWindow, hDC);
  }
}

void HandleKeys()
{
  if (!_bGameOver)
  {
    // Move the car based upon left/right key presses
    POINT ptVelocity = _pCarSprite->GetVelocity();
    if (GetAsyncKeyState(VK_LEFT) < 0)
    {
      // Move left
      ptVelocity.x = max((int)ptVelocity.x - 1, -4);
      _pCarSprite->SetVelocity(ptVelocity);
    }
    else if (GetAsyncKeyState(VK_RIGHT) < 0)
    {
      // Move right
      ptVelocity.x = min((int)ptVelocity.x + 2, 6);
      _pCarSprite->SetVelocity(ptVelocity);
    }

    // Fire missiles based upon spacebar presses
    if ((++_iFireInputDelay > 6) && GetAsyncKeyState(VK_SPACE) < 0)
    {
      // Create a new missile sprite
      RECT  rcBounds = { 0, 0, 600, 450 };
      RECT  rcPos = _pCarSprite->GetPosition();
      Sprite* pSprite = new Sprite(_pMissileBitmap, rcBounds, BA_DIE);
      pSprite->SetPosition(rcPos.left + 15, 400);
      pSprite->SetVelocity(0, -7);
      _pGame->AddSprite(pSprite);

      // Play the missile (fire) sound
      PlaySound((LPCSTR)IDW_MISSILE, _hInstance, SND_ASYNC |
        SND_RESOURCE | SND_NOSTOP);

      // Reset the input delay
      _iFireInputDelay = 0;
    }
  }

  // Start a new game based upon an Enter (Return) key press
  if (_bGameOver && (GetAsyncKeyState(VK_RETURN) < 0))
    // Start a new game
    NewGame();
}

void MouseButtonDown(int x, int y, BOOL bLeft)
{
}

void MouseButtonUp(int x, int y, BOOL bLeft)
{
}

void MouseMove(int x, int y)
{
}

void HandleJoystick(JOYSTATE jsJoystickState)
{
}

BOOL SpriteCollision(Sprite* pSpriteHitter, Sprite* pSpriteHittee)
{
  // See if a player missile and an alien have collided
  Bitmap* pHitter = pSpriteHitter->GetBitmap();
  Bitmap* pHittee = pSpriteHittee->GetBitmap();
  if ((pHitter == _pMissileBitmap && (pHittee == _pBlobboBitmap ||
    pHittee == _pJellyBitmap || pHittee == _pTimmyBitmap)) ||
    (pHittee == _pMissileBitmap && (pHitter == _pBlobboBitmap ||
    pHitter == _pJellyBitmap || pHitter == _pTimmyBitmap)))
  {
    // Play the small explosion sound
    PlaySound((LPCSTR)IDW_LGEXPLODE, _hInstance, SND_ASYNC |
      SND_RESOURCE);

    // Kill both sprites
    pSpriteHitter->Kill();
    pSpriteHittee->Kill();

    // Create a large explosion sprite at the alien's position
    RECT rcBounds = { 0, 0, 600, 450 };
    RECT rcPos;
    if (pHitter == _pMissileBitmap)
      rcPos = pSpriteHittee->GetPosition();
    else
      rcPos = pSpriteHitter->GetPosition();
    Sprite* pSprite = new Sprite(_pLgExplosionBitmap, rcBounds);
    pSprite->SetNumFrames(8, TRUE);
    pSprite->SetPosition(rcPos.left, rcPos.top);
    _pGame->AddSprite(pSprite);

    // Update the score
    _iScore += 25;
    _iDifficulty = max(80 - (_iScore / 20), 20);
  }

  // See if an alien missile has collided with the car
  if ((pHitter == _pCarBitmap && (pHittee == _pBMissileBitmap ||
    pHittee == _pJMissileBitmap || pHittee == _pTMissileBitmap)) ||
    (pHittee == _pCarBitmap && (pHitter == _pBMissileBitmap ||
    pHitter == _pJMissileBitmap || pHitter == _pTMissileBitmap)))
  {
    // Play the large explosion sound
    PlaySound((LPCSTR)IDW_LGEXPLODE, _hInstance, SND_ASYNC |
      SND_RESOURCE);

    // Kill the missile sprite
    if (pHitter == _pCarBitmap)
      pSpriteHittee->Kill();
    else
      pSpriteHitter->Kill();

    // Create a large explosion sprite at the car's position
    RECT rcBounds = { 0, 0, 600, 480 };
    RECT rcPos;
    if (pHitter == _pCarBitmap)
      rcPos = pSpriteHitter->GetPosition();
    else
      rcPos = pSpriteHittee->GetPosition();
    Sprite* pSprite = new Sprite(_pLgExplosionBitmap, rcBounds);
    pSprite->SetNumFrames(8, TRUE);
    pSprite->SetPosition(rcPos.left, rcPos.top);
    _pGame->AddSprite(pSprite);

    // Move the car back to the start
    _pCarSprite->SetPosition(300, 405);

    // See if the game is over
    if (--_iNumLives == 0)
    {
      // Play the game over sound
      PlaySound((LPCSTR)IDW_GAMEOVER, _hInstance, SND_ASYNC |
        SND_RESOURCE);
      _bGameOver = TRUE;
    }
  }

  return FALSE;
}

void SpriteDying(Sprite* pSprite)
{
  // See if an alien missile sprite is dying
  if (pSprite->GetBitmap() == _pBMissileBitmap ||
    pSprite->GetBitmap() == _pJMissileBitmap ||
    pSprite->GetBitmap() == _pTMissileBitmap)
  {
    // Play the small explosion sound
    PlaySound((LPCSTR)IDW_SMEXPLODE, _hInstance, SND_ASYNC |
      SND_RESOURCE | SND_NOSTOP);

    // Create a small explosion sprite at the missile's position
    RECT rcBounds = { 0, 0, 600, 450 };
    RECT rcPos = pSprite->GetPosition();
    Sprite* pSprite = new Sprite(_pSmExplosionBitmap, rcBounds);
    pSprite->SetNumFrames(8, TRUE);
    pSprite->SetPosition(rcPos.left, rcPos.top);
    _pGame->AddSprite(pSprite);
  }
}

//-----------------------------------------------------------------
// Functions
//-----------------------------------------------------------------
void NewGame()
{
  // Clear the sprites
  _pGame->CleanupSprites();

  // Create the car sprite
  RECT rcBounds = { 0, 0, 600, 450 };
  _pCarSprite = new Sprite(_pCarBitmap, rcBounds, BA_WRAP);
  _pCarSprite->SetPosition(300, 405);
  _pGame->AddSprite(_pCarSprite);

  // Initialize the game variables
  _iFireInputDelay = 0;
  _iScore = 0;
  _iNumLives = 3;
  _iDifficulty = 80;
  _bGameOver = FALSE;

  // Play the background music
  _pGame->PlayMIDISong();
}

void AddAlien()
{
  // Create a new random alien sprite
  RECT          rcBounds = { 0, 0, 600, 410 };
  AlienSprite*  pSprite;
  switch(rand() % 3)
  {
  case 0:
    // Blobbo
    pSprite = new AlienSprite(_pBlobboBitmap, rcBounds, BA_BOUNCE);
    pSprite->SetNumFrames(8);
    pSprite->SetPosition(((rand() % 2) == 0) ? 0 : 600, rand() % 370);
    pSprite->SetVelocity((rand() % 7) - 2, (rand() % 7) - 2);
    break;
  case 1:
    // Jelly
    pSprite = new AlienSprite(_pJellyBitmap, rcBounds, BA_BOUNCE);
    pSprite->SetNumFrames(8);
    pSprite->SetPosition(rand() % 600, rand() % 370);
    pSprite->SetVelocity((rand() % 5) - 2, (rand() % 5) + 3);
    break;
  case 2:
    // Timmy
    pSprite = new AlienSprite(_pTimmyBitmap, rcBounds, BA_WRAP);
    pSprite->SetNumFrames(8);
    pSprite->SetPosition(rand() % 600, rand() % 370);
    pSprite->SetVelocity((rand() % 7) + 3, 0);
    break;
  }

  // Add the alien sprite
  _pGame->AddSprite(pSprite);
}