Last updated: 18. 1.1998, 12:29
<* +M2EXTENSIONS *> (*-------------------------------------------------------------- CONNECT.C --- Connect-the-Dots Mouse Demo Program (c) Charles Petzold, 1996 Connect.mod --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 ------------------------------------------------------------*) MODULE Connect; IMPORT Windows; IMPORT SYSTEM; CONST MAXPOINTS = 1000; CONST szAppName = "Connect"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; iCount : INTEGER; points : ARRAY[0..MAXPOINTS] OF Windows.POINT; hdc : Windows.HDC; ps : Windows.PAINTSTRUCT; (*++++**********************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; (***************************************************************************) VAR i,j : INTEGER; BEGIN CASE (iMsg) OF | Windows.WM_LBUTTONDOWN : iCount := 0; Windows.InvalidateRect (hwnd, NIL, TRUE); RETURN 0; | Windows.WM_MOUSEMOVE : IF (wParam=1) AND (Windows.MK_LBUTTON=SYSTEM.CAST(Windows.MK_SET,1)) AND (iCount < 1000) THEN points[iCount].x := Windows.LOWORD (lParam); points[iCount].y := Windows.HIWORD (lParam); INC(iCount); hdc := Windows.GetDC (hwnd); Windows.SetPixel (hdc, Windows.LOWORD (lParam), Windows.HIWORD (lParam), 0000h); Windows.ReleaseDC (hwnd, hdc); END; RETURN 0; | Windows.WM_LBUTTONUP : Windows.InvalidateRect (hwnd, NIL, FALSE); RETURN 0; | Windows.WM_PAINT : hdc := Windows.BeginPaint (hwnd, ps); Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_WAIT)); Windows.ShowCursor (TRUE); FOR i := 0 TO iCount - 2 DO FOR j := i + 1 TO iCount-1 DO Windows.MoveToEx (hdc, points[i].x, points[i].y,NIL); Windows.LineTo (hdc, points[j].x, points[j].y); END; END; Windows.ShowCursor (FALSE); Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_ARROW)); Windows.EndPaint (hwnd, ps); RETURN 0; | Windows.WM_DESTROY : Windows.PostQuitMessage (0); RETURN 0; ELSE RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; (*+++***********************************************************************) PROCEDURE InitApplication () : BOOLEAN; (***************************************************************************) BEGIN wc.cbSize := SIZE(Windows.WNDCLASSEX); wc.style := Windows.CS_HREDRAW + Windows.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := Windows.MyInstance(); wc.hIcon := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); wc.hCursor := Windows.LoadCursor (NIL, Windows.IDC_ARROW); wc.hbrBackground := SYSTEM.CAST(Windows.HBRUSH, Windows.GetStockObject (Windows.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); RETURN Windows.RegisterClassEx(wc)#0; END InitApplication; (*+++***********************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (***************************************************************************) BEGIN hwnd := Windows.CreateWindow (szAppName, "Connect-the-Points Mouse Demo: Translation to Stony Brook Modula-2", Windows.WS_OVERLAPPEDWINDOW, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, NIL, NIL, wc.hInstance, NIL); IF hwnd = NIL THEN RETURN FALSE; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage (msg, NIL, 0, 0)) DO Windows.TranslateMessage (msg); Windows.DispatchMessage (msg); END; END; END Connect.