Clock(win32)

#define _CRT_SECURE_NO_WARNINGS 

#include <windows.h> 

#include <math.h> 

#include <time.h> 

#pragma comment(lib, "user32.lib") 

#pragma comment(lib, "gdi32.lib") 

#pragma comment(linker, "/SUBSYSTEM:Windows") 

  

void GetPos(double degree, int len, int* x, int* y) 

{ 

    *x = len * sin(degree); 

    *y = len * cos(degree); 

} 

  

void DrawClock(HWND hw, HDC h, int hour, int minute, int second) 

{ 

    HDC bufdc = CreateCompatibleDC(h); 

    HBITMAP buf = CreateCompatibleBitmap(bufdc, 200, 200); 

    RECT cr; 
    
    /* 创建一个白色的画刷 */
    HBRUSH bBg = CreateSolidBrush(RGB(255, 255, 255)); 

    GetClientRect(hw, &cr); 

    SelectObject(bufdc, bBg); 

    SelectObject(bufdc, buf); 
    
    FillRect(bufdc, &cr, bBg); 

  

    { 

        int sx, sy, ex, ey; 

        int i; 
        /* 这里应该是标记出表上的12个时间点 每个标记是一个小短线*/
        for(i = 0; i < 12; ++i) { 

            GetPos(2*3.14159/12*i, 85, &sx, &sy); 

            GetPos(2*3.14159/12*i, 95, &ex, &ey); 

            MoveToEx(bufdc, 100+sx, 100-sy, 0); 

            LineTo(bufdc, 100+ex, 100-ey); 

        } 

    } 

  
    /* 画出时针 分针 秒针 */
    { 

        int hx, hy, mx, my, sx, sy; 

        GetPos(2*3.14159 / 12 * (hour + (double)minute / 60 + (double)second / 3600), 50, &hx, &hy); 

        GetPos(2*3.14159 / 60 * (minute + (double)second / 60), 65, &mx, &my); 

        GetPos(2*3.14159 / 60 * second, 80, &sx, &sy); 

        MoveToEx(bufdc, 100, 100, NULL); 

        LineTo(bufdc, 100+hx, 100-hy); 

        MoveToEx(bufdc, 100, 100, NULL); 

        LineTo(bufdc, 100+mx, 100-my); 

        MoveToEx(bufdc, 100, 100, NULL); 

        LineTo(bufdc, 100+sx, 100-sy); 

    } 

      

    BitBlt(h, 0, 0, 200, 200, bufdc, 0, 0, SRCCOPY); 
    
    /* 释放分配的资源 */
    DeleteDC(bufdc); 

    DeleteObject(bBg); 

    DeleteObject(buf); 

} 

  

LRESULT CALLBACK WndProc(HWND h, UINT m, WPARAM w, LPARAM l) 

{ 

    switch(m) { 

        case WM_CREATE: 

            SetTimer(h, 1, 1000, 0);   /* 设置时间间隔 每一秒作为一个时间间隔 */

            return 0; 

        case WM_ERASEBKGND: 

            return 1; 

        case WM_TIMER: 

            InvalidateRect(h, 0, FALSE); 

            return 0; 

        case WM_PAINT: { 

            PAINTSTRUCT ps; 

            HDC dc = BeginPaint(h, &ps); 

            { 

                time_t t; 

                struct tm* pst; 

                time(&t); 

                pst = localtime(&t); 
                /* 调用上面定义的函数 描绘出当前时钟 */
                DrawClock(h, dc, pst->tm_hour, pst->tm_min, pst->tm_sec); 

            } 

            EndPaint(h, &ps); 

            return 0; 

        } 

        case WM_DESTROY: 

            KillTimer(h, 1);    /* 杀死定时器 */

            PostQuitMessage(0); 

            return 0; 

        default: 

            return DefWindowProc(h, m, w, l); 

    } 

} 

  

int APIENTRY WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmd, INT nShow) 

{ 

    WNDCLASS wc; 

    ZeroMemory(&wc, sizeof(wc)); 

    wc.style = CS_HREDRAW | CS_VREDRAW; 

    wc.lpfnWndProc = WndProc; 

    wc.hInstance = hInst; 

    wc.hbrBackground = (HBRUSH) COLOR_WINDOW; 

    wc.lpszClassName = TEXT("MYCLOCK"); 

      

    if (RegisterClass(&wc) != 0) { 

        MSG m; 
        
        /* 创建窗口 */
        HWND hw = CreateWindow(TEXT("MYCLOCK"), TEXT("Clock"), WS_OVERLAPPEDWINDOW, 

            CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInst, 0); 

          

        if (hw != NULL) { 

            RECT r; 

            GetWindowRect(hw, &r); 

            r.right = r.left + 200; 

            r.bottom = r.top + 200; 

            AdjustWindowRect(&r, WS_OVERLAPPEDWINDOW, FALSE); 

            MoveWindow(hw, r.left, r.top, r.right - r.left, r.bottom - r.top, FALSE); 

            ShowWindow(hw, SW_SHOWNORMAL);    /* 将窗口显示出来 */

            UpdateWindow(hw); 

          

            while( GetMessage(&m, 0, 0, 0) > 0) { 

                TranslateMessage(&m); 

                DispatchMessage(&m); 

            } 

            return 0; 

        } 

        return 1; 

    } else 

        return 1;
}