时钟程序（包含时针、分针、秒针）VC

/////////////////////////////////////////////////////////////// // SineWave.cpp文件 #include <windows.h> #include <math.h> #include <stdio.h> LRESULT __stdcall WndProc(HWND, UINT, WPARAM, LPARAM); //void OnPaint(HWND hwnd); void DrawHand(HDC hdc,int nLength,int nWidth,int nDegrees,COLORREF clrColor); void SetIsotropic(HWND hwnd,HDC hdc,int s_cxClient,int s_cyClient); void DrawClockFace(HDC hdc); int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) { char szWindowClass[] = "SineWave"; // 注册窗口类 WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = NULL; wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)::GetStockObject(WHITE_BRUSH); wcex.lpszMenuName = NULL; wcex.lpszClassName = szWindowClass; wcex.hIconSm = NULL; ::RegisterClassEx(&wcex); // 创建并线程主窗口 HWND hWnd = ::CreateWindowEx( WS_EX_CLIENTEDGE, // 扩展样式 szWindowClass, // 类名 "电子钟", // 标题 WS_OVERLAPPEDWINDOW, // 窗口样式 CW_USEDEFAULT, // 初始 X 坐标 CW_USEDEFAULT, // 初始 X 坐标 CW_USEDEFAULT, // 宽度 CW_USEDEFAULT, // 高度 NULL, // 父窗口句柄 NULL, // 菜单句柄 hInstance, // 程序实例句柄 NULL); ::ShowWindow(hWnd, nShowCmd); ::UpdateWindow(hWnd); // 进入消息循环 MSG msg; while(::GetMessage(&msg, NULL, 0, 0)) { ::TranslateMessage(&msg); ::DispatchMessage(&msg); } return 1; } // 消息处理函数 // 03SineWave工程下 LRESULT __stdcall WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { #define IDT_CLOCK 1 static int s_nPreHour; static int s_nPreMinute; static int s_nPreSecond; static int s_cxClient; static int s_cyClient; switch(message) { case WM_CREATE: { SYSTEMTIME time; //设置时间 ::GetLocalTime(&time); s_nPreHour=time.wHour%12; s_nPreMinute=time.wMinute; s_nPreSecond=time.wSecond; //创建定时器 ::SetTimer(hwnd,IDT_CLOCK,1000,NULL); return 0; } case WM_CLOSE: { ::KillTimer(hwnd,IDT_CLOCK); ::DestroyWindow(hwnd); return 0; } case WM_SIZE: { s_cxClient=LOWORD(lParam); s_cyClient=HIWORD(lParam); return 0; } case WM_PAINT: { PAINTSTRUCT ps; HDC hdc=::BeginPaint(hwnd,&ps); //设置坐标系 SetIsotropic(hwnd,hdc,s_cxClient,s_cyClient); //绘制时钟外观 DrawClockFace(hdc); //绘制指针 //经过一个小时时针走30度（360/12），经过一分钟时针走0.5度（30/60） DrawHand(hdc,200,8,s_nPreHour*30+s_nPreMinute/2,RGB(0,0,0)); DrawHand(hdc,400,6,s_nPreMinute*6,RGB(0,0,255)); DrawHand(hdc,400,1,s_nPreSecond*6,RGB(255,0,0)); SYSTEMTIME time; //设置时间 ::GetLocalTime(&time); //int szchar=time.wYear; ::TextOut(hdc,0,100,"2009",strlen("2009")); ::EndPaint(hwnd,&ps); break; } case WM_TIMER: { if(::IsIconic(hwnd)) { return 0; } //取得系统时间 SYSTEMTIME time; ::GetLocalTime(&time); //建立坐标系 HDC hdc=::GetDC(hwnd); SetIsotropic(hwnd,hdc,s_cxClient,s_cyClient); COLORREF crfColor=::GetSysColor(COLOR_3DFACE); if(time.wMinute!=s_nPreMinute) { DrawHand(hdc,200,8,s_nPreHour*30+s_nPreMinute/2,crfColor); DrawHand(hdc,400,6,s_nPreMinute*6,crfColor); s_nPreHour=time.wHour; s_nPreMinute=time.wMinute; } if(time.wSecond!=s_nPreSecond) { DrawHand(hdc,400,1,s_nPreSecond*6,crfColor); //重画所有指针 DrawHand(hdc,400,1,time.wSecond*6,RGB(255,0,0)); DrawHand(hdc,200,8,time.wHour*30+time.wMinute/2,RGB(0,255,0)); DrawHand(hdc,400,6,time.wMinute*6,RGB(0,0,255)); s_nPreSecond=time.wSecond; } break; } } return::DefWindowProc(hwnd, message, wParam, lParam); } void DrawHand(HDC hdc,int nLength,int nWidth,int nDegrees,COLORREF clrColor) { double nRadians=(double)nDegrees*0.0174533;//将角度转化为弧度 POINT pt[2];//计算坐标 pt[0].x=(int)(nLength*sin(nRadians)); pt[0].y=(int)(nLength*cos(nRadians)); pt[1].x=-pt[0].x/5; pt[1].y=-pt[0].y/5; //创建画笔，并加到DC结构中 HPEN hPen=::CreatePen(PS_SOLID,nWidth,clrColor); HPEN oldHpen=(HPEN)::SelectObject(hdc,hPen); ::MoveToEx(hdc,pt[0].x,pt[0].y,NULL); ::LineTo(hdc,pt[1].x,pt[1].y); ::SelectObject(hdc,oldHpen); ::DeleteObject(hPen); } void SetIsotropic(HWND hwnd,HDC hdc,int cx,int cy) { ::SetMapMode(hdc,MM_ISOTROPIC); ::SetWindowExtEx(hdc,1000,1000,NULL); ::SetViewportExtEx(hdc,cx,-cy,NULL); ::SetViewportOrgEx(hdc,cx/2,cy/2,NULL); } void DrawClockFace(HDC hdc) { const int SQUARESIZE=20; static POINT pt[]= { 0,450, 225,390, 390,225, 450,0, 390,-225, 225,-390, 0,-450, -225,-390, -390,-225, -450,0, -390,225, -225,390 }; //选择一个黑色画刷 ::SelectObject(hdc,::GetStockObject(BLACK_BRUSH)); //画十二个圆 for (int i=0;i<12;i++) { ::Ellipse(hdc,pt[i].x-SQUARESIZE,pt[i].y+SQUARESIZE, pt[i].x+SQUARESIZE,pt[i].y-SQUARESIZE); } }