/*

 CONNECT.C -- Connect-the-Dots Mouse Demo Program

             (c) Charles Petzold,1998

 */

 #include <Windows.h>

 #define MAXPOINTS 1000

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

 int WINAPI WinMain( __in HINSTANCE hInstance

                     , __in_opt HINSTANCE hPrevInstance

                     , __in LPSTR lpCmdLine

                     , __in int nShowCmd )

 {

     static TCHAR szAppName[] = TEXT("Connect");

     HWND hwnd;

     MSG msg;

     WNDCLASS wndclass;

     wndclass.style = CS_HREDRAW | CS_VREDRAW;

     wndclass.lpfnWndProc = WndProc;

     wndclass.cbClsExtra = ;

     wndclass.cbWndExtra = ;

     wndclass.hInstance = hInstance;

     wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

     wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

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

     wndclass.lpszMenuName = NULL;

     wndclass.lpszClassName = szAppName;

     if (!RegisterClass(&wndclass))

     {

         MessageBox(NULL, TEXT("Program requires Windows NT!")

             , szAppName, MB_ICONERROR);

         return ;

     }

     hwnd = CreateWindow(szAppName, TEXT("Connect-the-Points Mouse Demo")

         , WS_OVERLAPPEDWINDOW

         , CW_USEDEFAULT, CW_USEDEFAULT

         , CW_USEDEFAULT, CW_USEDEFAULT

         , NULL, NULL, hInstance, NULL);

     ShowWindow(hwnd, nShowCmd);

     UpdateWindow(hwnd);

     while (GetMessage(&msg, NULL, , ))

     {

         TranslateMessage(&msg);

         DispatchMessage(&msg);

     }

     return msg.wParam;

 }

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

 {

     static POINT pt[MAXPOINTS];

     static int iCount;

     HDC hdc;

     int i, j;

     PAINTSTRUCT ps;

     switch (message)

     {

     case WM_LBUTTONDOWN:

         iCount = ;

         InvalidateRect(hwnd, NULL, TRUE);

         return ;

     case WM_MOUSEMOVE:

         if (wParam & MK_LBUTTON && iCount < )

         {

             pt[iCount  ].x = LOWORD(lParam);

             pt[iCount++].y = HIWORD(lParam);

             hdc = GetDC(hwnd);

             SetPixel(hdc, LOWORD(lParam), HIWORD(lParam), );

             ReleaseDC(hwnd, hdc);

         }

         return ;

     case WM_LBUTTONUP:

         InvalidateRect(hwnd, NULL, FALSE);

         return ;

     case WM_PAINT:

         hdc = BeginPaint(hwnd, &ps);

         SetCursor(LoadCursor(NULL, IDC_WAIT));

         ShowCursor(TRUE);

         for (i = ; i < iCount - ; ++i)

             for (j = i + ; j < iCount; ++j)

             {

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

                 LineTo(hdc, pt[j].x, pt[j].y);

             }

         ShowCursor(FALSE);

         SetCursor(LoadCursor(NULL, IDC_ARROW));

         EndPaint(hwnd, &ps);

         return ;

     case WM_DESTROY:

         PostQuitMessage();

         return ;

     }

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

 }