roids.cpp

来自「《24小时教会你游戏编程》上的源码」· C++ 代码 · 共 155 行

//-----------------------------------------------------------------
// Roids Application
// C++ Source - Roids.cpp
//-----------------------------------------------------------------

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

//-----------------------------------------------------------------
// Game Engine Functions
//-----------------------------------------------------------------
BOOL GameInitialize(HINSTANCE hInstance)
{
  // Create the game engine
  _pGame = new GameEngine(hInstance, TEXT("Roids"),
    TEXT("Roids"), IDI_ROIDS, IDI_ROIDS_SM, 500, 400);
  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 asteroid bitmap
  HDC hDC = GetDC(hWindow);
  _pAsteroidBitmap = new Bitmap(hDC, IDB_ASTEROID, _hInstance);

  // Create the starry background
  _pBackground = new StarryBackground(500, 400);

  // Create the asteroid sprites
  RECT    rcBounds = { 0, 0, 500, 400 };
  Sprite* pSprite;
  pSprite = new Sprite(_pAsteroidBitmap, rcBounds, BA_WRAP);
  pSprite->SetNumFrames(14);
  pSprite->SetFrameDelay(1);
  pSprite->SetPosition(250, 200);
  pSprite->SetVelocity(-3, 1);
  _pGame->AddSprite(pSprite);
  pSprite = new Sprite(_pAsteroidBitmap, rcBounds, BA_WRAP);
  pSprite->SetNumFrames(14);
  pSprite->SetFrameDelay(2);
  pSprite->SetPosition(250, 200);
  pSprite->SetVelocity(3, -2);
  _pGame->AddSprite(pSprite);
  pSprite = new Sprite(_pAsteroidBitmap, rcBounds, BA_WRAP);
  pSprite->SetNumFrames(14);
  pSprite->SetFrameDelay(3);
  pSprite->SetPosition(250, 200);
  pSprite->SetVelocity(-2, -4);
  _pGame->AddSprite(pSprite);
}

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

  // Cleanup the asteroid bitmap
  delete _pAsteroidBitmap;

  // Cleanup the background
  delete _pBackground;

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

  // Cleanup the game engine
  delete _pGame;
}

void GameActivate(HWND hWindow)
{
}

void GameDeactivate(HWND hWindow)
{
}

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

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

void GameCycle()
{
  // 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()
{
}

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)
{
  return FALSE;
}