fore.cpp

来自「《24小时教会你游戏编程》上的源码」· C++ 代码 · 共 177 行

//-----------------------------------------------------------------
// Fore 2 Application
// C++ Source - Fore.cpp
//-----------------------------------------------------------------

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

//-----------------------------------------------------------------
// Game Engine Functions
//-----------------------------------------------------------------
BOOL GameInitialize(HINSTANCE hInstance)
{
  // Create the game engine
  _pGame = new GameEngine(hInstance, TEXT("Fore 2"),
    TEXT("Fore 2"), IDI_FORE, IDI_FORE_SM, 600, 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 bitmaps
  HDC hDC = GetDC(hWindow);
  _pForestBitmap = new Bitmap(hDC, IDB_FOREST, _hInstance);
  _pGolfBallBitmap = new Bitmap(hDC, IDB_GOLFBALL, _hInstance);

  // Create the golf ball sprites
  RECT    rcBounds = { 0, 0, 600, 400 };
  Sprite* pSprite;
  pSprite = new Sprite(_pGolfBallBitmap, rcBounds, BA_WRAP);
  pSprite->SetVelocity(5, 3);
  _pGame->AddSprite(pSprite);
  pSprite = new Sprite(_pGolfBallBitmap, rcBounds, BA_WRAP);
  pSprite->SetVelocity(3, 2);
  _pGame->AddSprite(pSprite);
  rcBounds.left = 265; rcBounds.right = 500; rcBounds.bottom = 335;
  pSprite = new Sprite(_pGolfBallBitmap, rcBounds, BA_BOUNCE);
  pSprite->SetVelocity(-6, 5);
  _pGame->AddSprite(pSprite);
  rcBounds.right = 470;
  pSprite = new Sprite(_pGolfBallBitmap, rcBounds, BA_BOUNCE);
  pSprite->SetVelocity(7, -3);
  _pGame->AddSprite(pSprite);

  // Set the initial drag info
  _pDragSprite = NULL;
}

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

  // Cleanup the bitmaps
  delete _pForestBitmap;
  delete _pGolfBallBitmap;

  // 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 forest
  _pForestBitmap->Draw(hDC, 0, 0);

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

void GameCycle()
{
  // 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)
{
  // See if a ball was clicked with the left mouse button
  if (bLeft && (_pDragSprite == NULL))
  {
    if ((_pDragSprite = _pGame->IsPointInSprite(x, y)) != NULL)
    {
      // Capture the mouse
      SetCapture(_pGame->GetWindow());

      // Simulate a mouse move to get started
      MouseMove(x, y);
    }
  }
}

void MouseButtonUp(int x, int y, BOOL bLeft)
{
  // Release the mouse
  ReleaseCapture();

  // Stop dragging
  _pDragSprite = NULL;
}

void MouseMove(int x, int y)
{
  if (_pDragSprite != NULL)
  {
    // Move the sprite to the mouse cursor position
    _pDragSprite->SetPosition(x - (_pDragSprite->GetWidth() / 2),
      y - (_pDragSprite->GetHeight() / 2));

    // Force a repaint to redraw the sprites
    InvalidateRect(_pGame->GetWindow(), NULL, FALSE);
  }
}

void HandleJoystick(JOYSTATE jsJoystickState)
{
}

BOOL SpriteCollision(Sprite* pSpriteHitter, Sprite* pSpriteHittee)
{
  // Swap the sprite velocities so that they appear to bounce
  POINT ptSwapVelocity = pSpriteHitter->GetVelocity();
  pSpriteHitter->SetVelocity(pSpriteHittee->GetVelocity());
  pSpriteHittee->SetVelocity(ptSwapVelocity);
  return TRUE;
}