C++小游戏 UFO 2 (VisualCPP代码作业)

//----------------------------------------------------------------- // Game Engine Object // C++ Source - GameEngine.cpp //----------------------------------------------------------------- //----------------------------------------------------------------- // Include Files //----------------------------------------------------------------- #include "GameEngine.h" //----------------------------------------------------------------- // Static Variable Initialization //----------------------------------------------------------------- GameEngine *GameEngine::m_pGameEngine = NULL; //----------------------------------------------------------------- // Windows Functions //----------------------------------------------------------------- int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { MSG msg; static int iTickTrigger = 0; int iTickCount; if (GameInitialize(hInstance)) { // Initialize the game engine if (!GameEngine::GetEngine()->Initialize(iCmdShow)) return FALSE; // Enter the main message loop while (TRUE) { if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { // Process the message if (msg.message == WM_QUIT) break; TranslateMessage(&msg); DispatchMessage(&msg); } else { // Make sure the game engine isn't sleeping if (!GameEngine::GetEngine()->GetSleep()) { // Check the tick count to see if a game cycle has elapsed iTickCount = GetTickCount(); if (iTickCount > iTickTrigger) { iTickTrigger = iTickCount + GameEngine::GetEngine()->GetFrameDelay(); HandleKeys(); GameEngine::GetEngine()->CheckJoystick(); GameCycle(); } } } } return (int)msg.wParam; } // End the game GameEnd(); return TRUE; } LRESULT CALLBACK WndProc(HWND hWindow, UINT msg, WPARAM wParam, LPARAM lParam) { // Route all Windows messages to the game engine return GameEngine::GetEngine()->HandleEvent(hWindow, msg, wParam, lParam); } //----------------------------------------------------------------- // GameEngine Constructor(s)/Destructor //----------------------------------------------------------------- GameEngine::GameEngine(HINSTANCE hInstance, LPTSTR szWindowClass, LPTSTR szTitle, WORD wIcon, WORD wSmallIcon, int iWidth, int iHeight) { // Set the member variables for the game engine m_pGameEngine = this; m_hInstance = hInstance; m_hWindow = NULL; if (lstrlen(szWindowClass) > 0) lstrcpy(m_szWindowClass, szWindowClass); if (lstrlen(szTitle) > 0) lstrcpy(m_szTitle, szTitle); m_wIcon = wIcon; m_wSmallIcon = wSmallIcon; m_iWidth = iWidth; m_iHeight = iHeight; m_iFrameDelay = 50; // 20 FPS default m_bSleep = TRUE; m_uiJoystickID = 0; } GameEngine::~GameEngine() { } //----------------------------------------------------------------- // Game Engine General Methods //----------------------------------------------------------------- BOOL GameEngine::Initialize(int iCmdShow) { WNDCLASSEX wndclass; // Create the window class for the main window wndclass.cbSize = sizeof(wndclass); wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = m_hInstance; wndclass.hIcon = LoadIcon(m_hInstance, MAKEINTRESOURCE(GetIcon())); wndclass.hIconSm = LoadIcon(m_hInstance, MAKEINTRESOURCE(GetSmallIcon())); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); wndclass.lpszMenuName = NULL; wndclass.lpszClassName = m_szWindowClass; // Register the window class if (!RegisterClassEx(&wndclass)) return FALSE; // Calculate the window size and position based upon the game size int iWindowWidth = m_iWidth + GetSystemMetrics(SM_CXFIXEDFRAME) * 2, iWindowHeight = m_iHeight + GetSystemMetrics(SM_CYFIXEDFRAME) * 2 + GetSystemMetrics(SM_CYCAPTION); if (wndclass.lpszMenuName != NULL) iWindowHeight += GetSystemMetrics(SM_CYMENU); int iXWindowPos = (GetSystemMetrics(SM_CXSCREEN) - iWindowWidth) / 2, iYWindowPos = (GetSystemMetrics(SM_CYSCREEN) - iWindowHeight) / 2; // Create the window m_hWindow = CreateWindow(m_szWindowClass, m_szTitle, WS_POPUPWINDOW | WS_CAPTION | WS_MINIMIZEBOX, iXWindowPos, iYWindowPos, iWindowWidth, iWindowHeight, NULL, NULL, m_hInstance, NULL); if (!m_hWindow) return FALSE; // Show and update the window ShowWindow(m_hWindow, iCmdShow); UpdateWindow(m_hWindow); return TRUE; } LRESULT GameEngine::HandleEvent(HWND hWindow, UINT msg, WPARAM wParam, LPARAM lParam) { // Route Windows messages to game engine member functions switch (msg) { case WM_CREATE: // Set the game window and start the game SetWindow(hWindow); GameStart(hWindow); return 0; case WM_SETFOCUS: // Activate the game and update the Sleep status GameActivate(hWindow); SetSleep(FALSE); return 0; case WM_KILLFOCUS: // Deactivate the game and update the Sleep status GameDeactivate(hWindow); SetSleep(TRUE); return 0; case WM_PAINT: HDC hDC; PAINTSTRUCT ps; hDC = BeginPaint(hWindow, &ps); // Paint the game GamePaint(hDC); EndPaint(hWindow, &ps); return 0; case WM_LBUTTONDOWN: // Handle left mouse button press MouseButtonDown(LOWORD(lParam), HIWORD(lParam), TRUE); return 0; case WM_LBUTTONUP: // Handle left mouse button release MouseButtonUp(LOWORD(lParam), HIWORD(lParam), TRUE); return 0; case WM_RBUTTONDOWN: // Handle right mouse button press MouseButtonDown(LOWORD(lParam), HIWORD(lParam), FALSE); return 0; case WM_RBUTTONUP: // Handle right mouse button release MouseButtonUp(LOWORD(lParam), HIWORD(lParam), FALSE); return 0; case WM_MOUSEMOVE: // Handle mouse movement MouseMove(LOWORD(lParam), HIWORD(lParam)); return 0; case WM_DESTROY: // End the game and exit the application GameEnd(); PostQuitMessage(0); return 0; } return DefWindowProc(hWindow, msg, wParam, lParam); } void GameEngine::ErrorQuit(LPTSTR szErrorMsg) { MessageBox(GetWindow(), szErrorMsg, TEXT("Critical Error"), MB_OK | MB_ICONERROR); PostQuitMessage(0); } BOOL GameEngine::InitJoystick() { // Make sure joystick driver is present UINT uiNumJoysticks; if ((uiNumJoysticks = joyGetNumDevs()) == 0) return FALSE; // Make sure the joystick is attached JOYINFO jiInfo; if (joyGetPos(JOYSTICKID1, &jiInfo) != JOYERR_UNPLUGGED) m_uiJoystickID = JOYSTICKID1; else return FALSE; // Calculate the trip values JOYCAPS jcCaps; joyGetDevCaps(m_uiJoystickID, &jcCaps, sizeof(JOYCAPS)); DWORD dwXCenter = ((DWORD)jcCaps.wXmin + jcCaps.wXmax) / 2; DWORD dwYCenter = ((DWORD)jcCaps.wYmin + jcCaps.wYmax) / 2; m_rcJoystickTrip.left = (jcCaps.wXmin + (WORD)dwXCenter) / 2; m_rcJoystickTrip.right = (jcCaps.wXmax + (WORD)dwXCenter) / 2; m_rcJoystickTrip.top = (jcCaps.wYmin + (WORD)dwYCenter) / 2; m_rcJoystickTrip.bottom = (jcCaps.wYmax + (WORD)dwYCenter) / 2; return TRUE; } void GameEngine::CaptureJoystick() { // Capture the joystick if (m_uiJoystickID == JOYSTICKID1) joySetCapture(m_hWindow, m_uiJoystickID, NULL, TRUE); } void GameEngine::ReleaseJoystick() { // Release the joystick if (m_uiJoystickID == JOYSTICKID1) joyRe