WinAPI——谐振动的合成

 #include<Windows.h>

 #include<math.h>

 #define NUM 1000

 #define PI  3.14159

 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM) ;

 void Draw(HWND) ;

 static int    cxClient, cyClient, xOffset, yOffset;

 POINT        apt[NUM] ;

 static int    A =  ;

 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

 {

     static TCHAR szAppName[] = TEXT("谐振动合成") ;

     HWND     hwnd ;

     MSG         msg ;

     WNDCLASS wndclass ;

     wndclass.cbClsExtra        = NULL ;

     wndclass.cbWndExtra        = NULL ;

     wndclass.hbrBackground    = (HBRUSH)GetStockObject(WHITE_BRUSH) ;

     wndclass.hCursor        = LoadCursor(NULL, IDC_ARROW) ;

     wndclass.hIcon            = LoadIcon(NULL, IDI_APPLICATION) ;

     wndclass.hInstance        = hInstance ;

     wndclass.lpfnWndProc    = WndProc ;

     wndclass.lpszClassName    = szAppName ;

     wndclass.lpszMenuName    = NULL ;

     wndclass.style            = CS_HREDRAW | CS_VREDRAW ;

     if(!RegisterClass(&wndclass))

     {

         MessageBox(NULL, TEXT("This Program Requires Windows NT !"), szAppName, MB_ICONERROR) ;

         return  ;

     }

     hwnd = CreateWindow(szAppName, TEXT("谐振动合成"), WS_OVERLAPPEDWINDOW,

             CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT,

             NULL, NULL, hInstance, NULL) ;

     ShowWindow(hwnd, iCmdShow) ;

     UpdateWindow(hwnd) ;

     while(TRUE)

     {

         if(PeekMessage(&msg, NULL, , , PM_REMOVE))

         {

             if(msg.message == WM_QUIT)

                 break ;

             TranslateMessage(&msg) ;

             DispatchMessage(&msg) ;

         }

         else

         {

             Draw(hwnd) ;

         }

     }

     return msg.wParam ;

 }

 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

 {

     switch(message)

     {

     case WM_SIZE :

         cxClient = LOWORD(lParam) ;

         cyClient = HIWORD(lParam) ;

         xOffset  = cxClient /  ;

         yOffset  = cyClient /  ;

         A = xOffset < yOffset ? xOffset : yOffset ;

         return  ;

     case WM_DESTROY :

         PostQuitMessage() ;

         return  ;

     }

     return DefWindowProc(hwnd, message, wParam, lParam) ;

 }

 void Draw(HWND hwnd)

 {

     HDC            hdc ;

     PAINTSTRUCT ps ;

     RECT        rect ;

     int            t ;

     static double    w1 = , w2 =  ;                // w1 : w2 = 1 : 2

     static double    g = PI /  ;                    // 初相位之差

     hdc = GetDC(hwnd) ;

     apt[].x = xOffset ;

     apt[].y = yOffset + A * sin(g) ;

     MoveToEx(hdc, apt[].x, apt[].y, NULL) ;

     for(t = ; t < NUM ; t++)

     {

         apt[t].x = xOffset + A * sin(t *  * w1 * w2 * PI /( NUM * w1 ));

         apt[t].y = yOffset + A * sin(t *  * w1 * w2 * PI /( NUM * w2 ) + g ) ;

         LineTo(hdc, apt[t].x, apt[t].y) ;

         MoveToEx(hdc, apt[t].x, apt[t].y, NULL) ;

     }

 //    Polyline(hdc, apt, NUM ) ;

     rect.bottom = cyClient ;

     rect.left    =  ;

     rect.right  = cxClient ;

     rect.top    =  ;

 //    Sleep(1000) ;

 //    w1 ++ ;

 //    w2 ++ ;

 //    g += PI / 4 ;

 //    InvalidateRect(hwnd, &rect, TRUE) ;

     ReleaseDC(hwnd, hdc) ;

 }