游戏编程入门（美 Michael Morrison）

//----------------------------------------------------------------- // Space Out 4 Application // C++ Source - SpaceOut.cpp //----------------------------------------------------------------- //----------------------------------------------------------------- // Include Files //----------------------------------------------------------------- #include "SpaceOut.h" //----------------------------------------------------------------- // Game Engine Functions //----------------------------------------------------------------- BOOL GameInitialize(HINSTANCE hInstance) { // Create the game engine g_pGame = new GameEngine(hInstance, TEXT("Space Out 4"), TEXT("Space Out 4"), IDI_SPACEOUT, IDI_SPACEOUT_SM, 600, 450); if (g_pGame == NULL) return FALSE; // Set the frame rate g_pGame->SetFrameRate(30); // Store the instance handle g_hInstance = hInstance; return TRUE; } void GameStart(HWND hWindow) { // Read the hi scores ReadHiScores(); // Seed the random number generator srand(GetTickCount()); // Create the offscreen device context and bitmap g_hOffscreenDC = CreateCompatibleDC(GetDC(hWindow)); g_hOffscreenBitmap = CreateCompatibleBitmap(GetDC(hWindow), g_pGame->GetWidth(), g_pGame->GetHeight()); SelectObject(g_hOffscreenDC, g_hOffscreenBitmap); // Create and load the bitmaps HDC hDC = GetDC(hWindow); g_pSplashBitmap = new Bitmap(hDC, IDB_SPLASH, g_hInstance); g_pDesertBitmap = new Bitmap(hDC, IDB_DESERT, g_hInstance); g_pCarBitmap = new Bitmap(hDC, IDB_CAR, g_hInstance); g_pSmCarBitmap = new Bitmap(hDC, IDB_SMCAR, g_hInstance); g_pMissileBitmap = new Bitmap(hDC, IDB_MISSILE, g_hInstance); g_pBlobboBitmap = new Bitmap(hDC, IDB_BLOBBO, g_hInstance); g_pBMissileBitmap = new Bitmap(hDC, IDB_BMISSILE, g_hInstance); g_pJellyBitmap = new Bitmap(hDC, IDB_JELLY, g_hInstance); g_pJMissileBitmap = new Bitmap(hDC, IDB_JMISSILE, g_hInstance); g_pTimmyBitmap = new Bitmap(hDC, IDB_TIMMY, g_hInstance); g_pTMissileBitmap = new Bitmap(hDC, IDB_TMISSILE, g_hInstance); g_pSmExplosionBitmap = new Bitmap(hDC, IDB_SMEXPLOSION, g_hInstance); g_pLgExplosionBitmap = new Bitmap(hDC, IDB_LGEXPLOSION, g_hInstance); g_pGameOverBitmap = new Bitmap(hDC, IDB_GAMEOVER, g_hInstance); // Create the starry background g_pBackground = new StarryBackground(600, 450); // Start the game for demo mode g_bDemo = TRUE; NewGame(); } void GameEnd() { // Close the MIDI player for the background music g_pGame->CloseMIDIPlayer(); // Cleanup the offscreen device context and bitmap DeleteObject(g_hOffscreenBitmap); DeleteDC(g_hOffscreenDC); // Cleanup the bitmaps delete g_pSplashBitmap; delete g_pDesertBitmap; delete g_pCarBitmap; delete g_pSmCarBitmap; delete g_pMissileBitmap; delete g_pBlobboBitmap; delete g_pBMissileBitmap; delete g_pJellyBitmap; delete g_pJMissileBitmap; delete g_pTimmyBitmap; delete g_pTMissileBitmap; delete g_pSmExplosionBitmap; delete g_pLgExplosionBitmap; delete g_pGameOverBitmap; // Cleanup the background delete g_pBackground; // Cleanup the sprites g_pGame->CleanupSprites(); // Cleanup the game engine delete g_pGame; // Save the hi scores WriteHiScores(); } void GameActivate(HWND hWindow) { if (!g_bDemo) // Resume the background music g_pGame->PlayMIDISong(TEXT(""), FALSE); } void GameDeactivate(HWND hWindow) { if (!g_bDemo) // Pause the background music g_pGame->PauseMIDISong(); } void GamePaint(HDC hDC) { // Draw the background g_pBackground->Draw(hDC); // Draw the desert bitmap g_pDesertBitmap->Draw(hDC, 0, 371); // Draw the sprites g_pGame->DrawSprites(hDC); if (g_bDemo) { // Draw the splash screen image g_pSplashBitmap->Draw(hDC, 142, 20, TRUE); // Draw the hi scores TCHAR szText[64]; RECT rect = { 275, 250, 325, 270}; SetBkMode(hDC, TRANSPARENT); SetTextColor(hDC, RGB(255, 255, 255)); for (int i = 0; i < 5; i++) { wsprintf(szText, "%d", g_iHiScores[i]); DrawText(hDC, szText, -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER); rect.top += 20; rect.bottom += 20; } } else { // Draw the score TCHAR szText[64]; RECT rect = { 460, 0, 510, 30 }; wsprintf(szText, "%d", g_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 < g_iNumLives; i++) g_pSmCarBitmap->Draw(hDC, 520 + (g_pSmCarBitmap->GetWidth() * i), 10, TRUE); // Draw the game over message, if necessary if (g_bGameOver) g_pGameOverBitmap->Draw(hDC, 170, 100, TRUE); } } void GameCycle() { if (!g_bGameOver) { if (!g_bDemo) { // Randomly add aliens if ((rand() % g_iDifficulty) == 0) AddAlien(); } // Update the background g_pBackground->Update(); // Update the sprites g_pGame->UpdateSprites(); // Obtain a device context for repainting the game HWND hWindow = g_pGame->GetWindow(); HDC hDC = GetDC(hWindow); // Paint the game to the offscreen device context GamePaint(g_hOffscreenDC); // Blit the offscreen bitmap to the game screen BitBlt(hDC, 0, 0, g_pGame->GetWidth(), g_pGame->GetHeight(), g_hOffscreenDC, 0, 0, SRCCOPY); // Cleanup ReleaseDC(hWindow, hDC); } else if (--g_iGameOverDelay == 0) { // Stop the music and switch to demo mode g_pGame->PauseMIDISong(); g_bDemo = TRUE; NewGame(); } } void HandleKeys() { if (!g_bGameOver && !g_bDemo) { // Move the car based upon left/right key presses POINT ptVelocity = g_pCarSprite->GetVelocity(); if (GetAsyncKeyState(VK_LEFT) < 0) { // Move left ptVelocity.x = max(ptVelocity.x - 1, -4); g_pCarSprite->SetVelocity(ptVelocity); } else if (GetAsyncKeyState(VK_RIGHT) < 0) { // Move right ptVelocity.x = min(ptVelocity.x + 2, 6); g_pCarSprite->SetVelocity(ptVelocity); } // Fire missiles based upon spacebar presses if ((++g_iFireInputDelay > 6) && GetAsyncKeyState(VK_SPACE) < 0) { // Create a new missile sprite RECT rcBounds = { 0, 0, 600, 450 }; RECT rcPos = g_pCarSprite->GetPosition(); Sprite* pSprite = new Sprite(g_pMissileBitmap, rcBounds, BA_DIE); pSprite->SetPosition(rcPos.left + 15, 400); pSprite->SetVelocity(0, -7); g_pGame->AddSprite(pSprite); // Play the missile (fire) sound PlaySound((LPCSTR)IDW_MISSILE, g_hInstance, SND_ASYNC | SND_RESOURCE | SND_NOSTOP); // Reset the input delay g_iFireInputDelay = 0; } } // Start a new game based upon an Enter (Return) key press if (GetAsyncKeyState(VK_RETURN) < 0) if (g_bDemo) { // Switch out of demo mode to start a new game g_bDemo = FALSE; NewGame(); } else if (g_bGameOver) { // 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 == g_pMissileBitmap && (pHittee == g_pBlobboBitmap || pHittee == g_pJellyBitmap || pHittee == g_pTimmyBitmap)) || (pHittee == g_pMissileBitmap && (pHitter == g_pBlobboBitmap |