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- /*--------------------------------------------------
- LINEDEMO.C -- Line-Drawing Demonstration Program
- (c) Charles Petzold, 1998
- --------------------------------------------------*/
-
- #include <windows.h>
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("LineDemo") ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- 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 = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("Program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("Line Demonstration"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static int cxClient, cyClient ;
- HDC hdc ;
- PAINTSTRUCT ps ;
-
- switch (message)
- {
- case WM_SIZE:
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- return 0 ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- Rectangle (hdc, cxClient / 8, cyClient / 8,
- 7 * cxClient / 8, 7 * cyClient / 8) ;
-
- MoveToEx (hdc, 0, 0, NULL) ;
- LineTo (hdc, cxClient, cyClient) ;
-
- MoveToEx (hdc, 0, cyClient, NULL) ;
- LineTo (hdc, cxClient, 0) ;
-
- Ellipse (hdc, cxClient / 8, cyClient / 8,
- 7 * cxClient / 8, 7 * cyClient / 8) ;
-
- RoundRect (hdc, cxClient / 4, cyClient / 4,
- 3 * cxClient / 4, 3 * cyClient / 4,
- cxClient / 4, cyClient / 4) ;
-
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-