(dev-c++)opengl示例小程序:clock

/************************** * Includes * **************************/ #include <windows.h> #include <gl/gl.h> #include <math.h> /************************** * Function Declarations * **************************/ LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC); void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC); /************************** * WinMain * **************************/ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int iCmdShow) { WNDCLASS wc; HWND hWnd; HDC hDC; HGLRC hRC; MSG msg; BOOL bQuit = FALSE; float theta = 0.0f; float minute=0; float hour=0; /* register window class */ wc.style = CS_OWNDC; wc.lpfnWndProc = WndProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = LoadIcon (NULL, IDI_APPLICATION); wc.hCursor = LoadCursor (NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH); wc.lpszMenuName = NULL; wc.lpszClassName = "GLSample"; RegisterClass (&wc); /* create main window */ //HWND CreateWindow( //LPCTSTR lpClassName,LPCTSTR lpWindowName, //DWORD dwStyle, //int x,int y,int nWidth，int nHeight， //HWND hWndParent,HMENU hMenu，HANDLE hlnstance，LPVOID lpParam）； hWnd = CreateWindow ( "GLSample", "OpenGL Sample", WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE, 100, 100, 500, 530, NULL, NULL, hInstance, NULL); /* enable OpenGL for the window */ EnableOpenGL (hWnd, &hDC, &hRC); /* program main loop */ while (!bQuit) { /* check for messages */ if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) { /* handle or dispatch messages */ if (msg.message == WM_QUIT) { bQuit = TRUE; } else { TranslateMessage (&msg); DispatchMessage (&msg); } } else { /* OpenGL animation code goes here */ glClearColor (0.0f, 0.0f, 0.0f, 0.0f); glClear (GL_COLOR_BUFFER_BIT); glPushMatrix (); glBegin(GL_TRIANGLE_FAN); glColor3f(1.0f,1.0f,0.0f); for(int i=0;i<=390;i+=30) { float p=(float)(i*3.14/180); glVertex3f((float)sin(p)/1.5,(float)cos(p)/1.5,0.0f); } glEnd(); glBegin(GL_TRIANGLE_FAN); glColor3f(0.0f,0.0f,0.0f); for(int i=0;i<=365;i+=5) { float p=(float)(i*3.14/180); glVertex3f((float)sin(p)/1.6,(float)cos(p)/1.6,0.0f); } glEnd(); glBegin(GL_POINTS); glColor3f(1.0f,1.0f,0.0f); for(int i=0;i<=365;i+=30) { float p=(float)(i*3.14/180); /*glBegin(GL_POLYGON); glVertex3f((float)sin(p)/2.2,(float)cos(p)/2.2,0.0f); glVertex3f((float)sin(p)/2.4,(float)cos(p)/2.4,0.0f); glVertex3f((float)sin(p+0.02)/2.2,(float)cos(p+0.02)/2.2,0.0f); glVertex3f((float)sin(p+0.02)/2.4,(float)cos(p+0.02)/2.4,0.0f); glEnd();*/ glBegin(GL_LINES); glVertex3f((float)sin(p)/2.0,(float)cos(p)/2.0,0.0f); glVertex3f((float)sin(p)/1.8,(float)cos(p)/1.8,0.0f); glEnd(); } glEnd(); glPopMatrix (); glPushMatrix ();//矩阵入栈，防止调用函数变换后改变现有矩阵 glRotatef (theta, 0.0f, 0.0f, 1.0f);//实现绕坐标轴旋转 /*glBegin (GL_TRIANGLES); glColor3f (1.0f, 0.0f, 0.0f); glVertex2f (0.0f, 1.0f); glColor3f (0.0f, 1.0f, 0.0f); glVertex2f (0.87f, -0.5f); glColor3f (0.0f, 0.0f, 1.0f); glVertex2f (-0.87f, -0.5f); glEnd ();*/ glBegin(GL_LINES); glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f,-0.1f); glVertex2f(0.0f,0.5f); glEnd(); glPopMatrix (); glPushMatrix (); glRotatef (theta/60, 0.0f, 0.0f, 1.0f); glBegin(GL_LINES); glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.0f,-0.07f); glVertex2f(0.0f,0.4f); glEnd(); glPopMatrix (); glPushMatrix (); glRotatef (theta/3600, 0.0f, 0.0f, 1.0f); glBegin(GL_LINES); glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(0.0f,-0.05f); glVertex2f(0.0f,0.3f); glEnd(); glPopMatrix (); glColor3f(1.0f,1.0f,0.0f); glBegin(GL_POLYGON); glVertex2f(0.01f,0.0f); glVertex2f(0.0f,0.01f); glVertex2f(-0.01f,0.0f); glVertex2f(0.0f,-0.01f); glEnd(); SwapBuffers (hDC); theta -= 6.0f; Sleep (1000); } } /* shutdown OpenGL */ DisableOpenGL (hWnd, hDC, hRC); /* destroy the window explicitly */ DestroyWindow (hWnd); return msg.wParam; } /******************** * Window Procedure * ********************/ LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_CREATE: return 0; case WM_CLOSE: PostQuitMessage (0); return 0; case WM_DESTROY: return 0; case WM_KEYDOWN: switch (wParam) { case VK_ESCAPE: PostQuitMessage(0); return 0; } return 0; default: return DefWindowProc (hWnd, message, wParam, lParam); } } /******************* * Enable OpenGL * *******************/ void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC) { PIXELFORMATDESCRIPTOR pfd; int iFormat; /* get the device context (DC) */ *hDC = GetDC (hWnd); /* set the pixel format for the DC */ ZeroMemory (&pfd, sizeof (pfd)); pfd.nSize = sizeof (pfd); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 24; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; iFormat = ChoosePixelFormat (*hDC, &pfd); SetPixelFormat (*hDC, iFormat, &pfd); /* create and enable the render context (RC) */ *hRC = wglCreateContext( *hDC ); wglMakeCurrent( *hDC, *hRC ); } /****************** * Disable OpenGL * ******************/ void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC) { wglMakeCurrent (NULL, NULL); wglDeleteContext (hRC); ReleaseDC (hWnd, hDC); }