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- /* Connect.C - Connect the Dots Program
- Petzold
- */
-
- #include <windows.h>
-
- #define MAXPOINTS 1000
-
- long FAR PASCAL WndProc (HWND, WORD, WORD, LONG);
-
- int PASCAL WinMain (HANDLE hInstance,
- HANDLE hPrevInstance,
- LPSTR lpszCmdParam,
- int nCmdShow)
-
- {
- static char szAppName[] = "Connect";
- HWND hwnd;
- MSG msg;
- WNDCLASS wndclass;
-
- if (!hPrevInstance)
- {
- wndclass.style = CS_HREDRAW | CS_VREDRAW;
- wndclass.lpfnWndProc = WndProc;
- wndclass.cbClsExtra = 0;
- wndclass.cbWndExtra = 0;
- wndclass.hInstance = hInstance;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
- wndclass.hbrBackground = GetStockObject (WHITE_BRUSH);
- wndclass.lpszMenuName = NULL;
- wndclass.lpszClassName = szAppName;
-
- RegisterClass(&wndclass);
- }
-
- hwnd = CreateWindow (szAppName,
- "Connect-the-Dots Mouse Demo",
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- NULL,
- NULL,
- hInstance,
- NULL);
-
- ShowWindow (hwnd, nCmdShow);
- UpdateWindow (hwnd);
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg);
- DispatchMessage (&msg);
- }
-
- return msg.wParam;
- }
-
- long FAR PASCAL WndProc (HWND hwnd,
- WORD message,
- WORD wParam,
- LONG lParam)
-
- {
- static POINT points[MAXPOINTS];
- static short nCount;
- HDC hdc;
- PAINTSTRUCT ps;
- short i, j;
-
- switch (message)
- {
- case WM_LBUTTONDOWN:
- nCount = 0;
- InvalidateRect (hwnd, NULL, TRUE);
- return 0;
-
- case WM_MOUSEMOVE:
- if (wParam & MK_LBUTTON && nCount < MAXPOINTS)
- {
- points [nCount++] = MAKEPOINT (lParam);
- hdc = GetDC (hwnd);
- SetPixel (hdc, LOWORD (lParam), HIWORD (lParam), 0l);
- ReleaseDC (hwnd, hdc);
- }
- return 0;
-
- case WM_LBUTTONUP:
- InvalidateRect (hwnd, NULL, FALSE);
- return 0;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps);
-
- for (i = 0; i < nCount - 1; i++)
- for (j = i; j < nCount; j++)
- {
- MoveTo (hdc, points[i].x, points[i].y);
- LineTo (hdc, points[j].x, points[j].y);
- }
- EndPaint (hwnd, &ps);
- return 0;
-
- case WM_DESTROY:
- PostQuitMessage (0);
- return 0;
- }
-
- return DefWindowProc (hwnd, message, wParam, lParam);
- }
-
-