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- /*-------------------------------------------------
- CHECKER2.C -- Mouse Hit-Test Demo Program No. 2
- (c) Charles Petzold, 1990
- -------------------------------------------------*/
-
- #include <windows.h>
- #define DIVISIONS 5
-
- long FAR PASCAL WndProc (HWND, WORD, WORD, LONG) ;
-
- int PASCAL WinMain (HANDLE hInstance, HANDLE hPrevInstance,
- LPSTR lpszCmdLine, int nCmdShow)
- {
- static char szAppName[] = "Checker2" ;
- 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 = NULL ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
-
- RegisterClass (&wndclass) ;
- }
-
- hwnd = CreateWindow (szAppName, "Checker2 Mouse Hit-Test 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 BOOL fState[DIVISIONS][DIVISIONS] ;
- static short cxBlock, cyBlock ;
- HDC hdc ;
- PAINTSTRUCT ps ;
- POINT point ;
- RECT rect ;
- short x, y ;
-
- switch (message)
- {
- case WM_SIZE:
- cxBlock = LOWORD (lParam) / DIVISIONS ;
- cyBlock = HIWORD (lParam) / DIVISIONS ;
- return 0 ;
-
- case WM_SETFOCUS:
- ShowCursor (TRUE) ;
- return 0 ;
-
- case WM_KILLFOCUS:
- ShowCursor (FALSE) ;
- return 0 ;
-
- case WM_KEYDOWN:
- GetCursorPos (&point) ;
- ScreenToClient (hwnd, &point) ;
-
- x = max (0, min (DIVISIONS - 1, point.x / cxBlock)) ;
- y = max (0, min (DIVISIONS - 1, point.y / cyBlock)) ;
-
- switch (wParam)
- {
- case VK_UP:
- y -- ;
- break ;
-
- case VK_DOWN:
- y ++ ;
- break ;
-
- case VK_LEFT:
- x -- ;
- break ;
-
- case VK_RIGHT:
- x ++ ;
- break ;
-
- case VK_HOME:
- x = y = 0 ;
- break ;
-
- case VK_END:
- x = y = DIVISIONS - 1 ;
- break ;
-
- case VK_RETURN:
- case VK_SPACE:
- SendMessage (hwnd, WM_LBUTTONDOWN, MK_LBUTTON,
- MAKELONG (x * cxBlock, y * cyBlock)) ;
- break ;
- }
- x = (x + DIVISIONS) % DIVISIONS ;
- y = (y + DIVISIONS) % DIVISIONS ;
-
- point.x = x * cxBlock + cxBlock / 2 ;
- point.y = y * cyBlock + cyBlock / 2 ;
-
- ClientToScreen (hwnd, &point) ;
- SetCursorPos (point.x, point.y) ;
- return 0 ;
-
- case WM_LBUTTONDOWN:
- x = LOWORD (lParam) / cxBlock ;
- y = HIWORD (lParam) / cyBlock ;
-
- if (x < DIVISIONS && y < DIVISIONS)
- {
- fState[x][y] ^= 1 ;
-
- rect.left = x * cxBlock ;
- rect.top = y * cyBlock ;
- rect.right = (x + 1) * cxBlock ;
- rect.bottom = (y + 1) * cyBlock ;
-
- InvalidateRect (hwnd, &rect, FALSE) ;
- }
- else
- MessageBeep (0) ;
- return 0 ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- for (x = 0 ; x < DIVISIONS ; x++)
- for (y = 0 ; y < DIVISIONS ; y++)
- {
- Rectangle (hdc, x * cxBlock, y * cyBlock,
- (x + 1) * cxBlock, (y + 1) * cyBlock) ;
-
- if (fState [x][y])
- {
- MoveTo (hdc, x * cxBlock, y * cyBlock) ;
- LineTo (hdc, (x+1) * cxBlock, (y+1) * cyBlock) ;
- MoveTo (hdc, x * cxBlock, (y+1) * cyBlock) ;
- LineTo (hdc, (x+1) * cxBlock, y * cyBlock) ;
- }
- }
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-