简单的重力

CODE:

/***************************************************************************************************** * File name: Game.cpp * Create time: 2015/03/28 * Module: View * Author: zengqh * Blog: http://blog.csdn.net/aimyton * --------------------------------------------------------------------------------------------------- * Memo: * *****************************************************************************************************/ #include "Game.h" /***************************************************************************************************** * Macro and Struct definition *****************************************************************************************************/ #define DYNAMIC_RANGE (200) #define ACCELERATION (1000) /***************************************************************************************************** * Global variables *****************************************************************************************************/ extern HINSTANCE HInstance; f32 g_start_speed = 0.0f; f32 g_circle_time = 0.0f; /***************************************************************************************************** * Global function declare *****************************************************************************************************/ /***************************************************************************************************** * Global function definition *****************************************************************************************************/ /***************************************************************************************************** * Class declare ******************************************************************************************************/ Game::Game() : m_surface_width(640) , m_surface_height(480) , m_hwnd(0) , m_backbuff_bitmap(0) , m_back_buffer(NULL) , m_should_exit_game(false) , m_start_render_time(0) , m_min_y(480) { g_circle_time = 2 * sqrtf(2 * DYNAMIC_RANGE / (float)ACCELERATION); g_start_speed = ACCELERATION * (g_circle_time / 2.0f); } Game::~Game() { } bool Game::Initalize() { if(!initDriver()) return false; return true; } bool Game::UnInitialize() { return true; } bool Game::Loop() { handleMessage(); return true; } void Game::handleMessage() { MSG msg; ::ZeroMemory(&msg, sizeof(MSG)); static float lastTime = (float)timeGetTime(); while(msg.message != WM_QUIT) { if(m_should_exit_game) { PostMessage(m_hwnd, WM_QUIT, 0, 0); } if(::PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) { ::TranslateMessage(&msg); ::DispatchMessage(&msg); } else { float timeLog=1.0f / 100.0f; float currTime =(float)timeGetTime(); float timeDelta =(currTime-lastTime) * 0.001f; if(timeDelta < timeLog) { float sleep=1000 * (timeLog - timeDelta); Sleep(sleep); } currTime =(float)timeGetTime(); timeDelta =(currTime-lastTime)*0.001f; gameLoop(timeDelta); lastTime = currTime; } } } void Game::gameLoop(float time_delta) { frameStarted(); render(); frameEnded(); swap(); } void Game::frameStarted() { memset(m_back_buffer, 0x0, m_surface_width * m_surface_height * 4); } void Game::render() { renderTextFixed(m_surface_width / 2 - 200, m_surface_height / 2, "hello world"); renderTextBottom(m_surface_width / 2, m_surface_height / 2, "hello world"); renderTextCenter(m_surface_width / 2 - 100, m_surface_height / 2, "hello world"); } void Game::frameEnded() { } void Game::swap() { BitBlt(m_hdc, 0, 0, m_surface_width, m_surface_height, m_bdc, 0, 0, SRCCOPY); } bool Game::initDriver() { createWindow(); createBackBuffer(); return true; } bool Game::createWindow() { WNDCLASS wc; wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = (WNDPROC)WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = HInstance; wc.hIcon = LoadIcon(0, IDI_APPLICATION); wc.hCursor = LoadCursor(0, IDC_ARROW); wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); wc.lpszMenuName = 0; wc.lpszClassName = "GameDemo"; if( !RegisterClass(&wc) ) { ::MessageBox(0, "RegisterClass() - FAILED", 0, 0); return false; } RECT rect = {0, 0, m_surface_width, m_surface_height}; ::AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE); HWND hwnd = 0; hwnd = ::CreateWindow("GameDemo", "GameDemo", WS_OVERLAPPEDWINDOW, 0, 0, rect.right - rect.left, rect.bottom - rect.top, 0 /*parent hwnd*/, 0 /* menu */, HInstance, 0 /*extra*/); if( !hwnd ) { ::MessageBox(0, "CreateWindow() - FAILED", 0, 0); return false; } m_hwnd = hwnd; m_hdc = ::GetDC(m_hwnd); ::ShowWindow(hwnd, SW_SHOW); ::UpdateWindow(hwnd); return true; } bool Game::createBackBuffer() { BITMAPINFO bitmap_info = {0}; bitmap_info.bmiHeader.biSize = sizeof(bitmap_info); bitmap_info.bmiHeader.biWidth = m_surface_width; bitmap_info.bmiHeader.biHeight = m_surface_height; bitmap_info.bmiHeader.biPlanes = 1; bitmap_info.bmiHeader.biSizeImage = 0; bitmap_info.bmiHeader.biXPelsPerMeter = 0; bitmap_info.bmiHeader.biYPelsPerMeter = 0; bitmap_info.bmiHeader.biClrUsed = 0; bitmap_info.bmiHeader.biClrImportant = 0; bitmap_info.bmiHeader.biBitCount = 32; bitmap_info.bmiHeader.biCompression = BI_RGB; m_bdc = CreateCompatibleDC(m_hdc); m_backbuff_bitmap = CreateDIBSection( NULL, &bitmap_info, 0, (void**)&m_back_buffer, 0, 0); ::SelectObject(m_bdc, m_backbuff_bitmap); return (m_back_buffer != NULL ? true : false); } void Game::renderTextFixed(int x, int y, char* str) { ::TextOutA(m_bdc, x, y, str, strlen(str)); } void Game::renderTextBottom(int x, int y, char* str) { if(m_start_render_time == 0) { m_start_render_time = GetTickCount(); } else { u32 curr_time = GetTickCount(); float time_delta = (curr_time - m_start_render_time) / 1000.0f; float one_circle_time = time_delta - (u32)(time_delta / g_circle_time) * g_circle_time; float accer = ACCELERATION; y += -g_start_speed * one_circle_time + 0.5f * accer * one_circle_time * one_circle_time; ::TextOutA(m_bdc, x, y, str, strlen(str)); } } void Game::renderTextCenter(int x, int y, char* str) { if(m_start_render_time == 0) { m_start_render_time = GetTickCount(); } else { u32 curr_time = GetTickCount(); float time_delta = (curr_time - m_start_render_time) / 1000.0f; float one_circle_time = time_delta - (u32)(time_delta / g_circle_time) * g_circle_time; float accer = ACCELERATION; y += -g_start_speed * one_circle_time + 0.5f * accer * one_circle_time * one_circle_time; if(y < m_min_y) { m_min_y = y; } y += (DYNAMIC_RANGE >> 1); ::TextOutA(m_bdc, x, y, str, strlen(str)); } } LRESULT CALLBACK Game::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch( msg ) { case WM_DESTROY: ::PostQuitMessage(0); break; } return ::DefWindowProc(hwnd, msg, wParam, lParam); } /***************************************************************************************************** * Class definition *****************************************************************************************************/ /***********************************End of File*******************************************************/