Last updated: 16. 1.1998, 20:40
<*/NOWARN:F*> MODULE Bezier; (*--------------------------------------- BEZIER.C --- Bezier Splines Demo (c) Charles Petzold, 1996 Bezier.mod --- Translation to Stony Brook Modula-2 (c) Peter Stadler, 1997 ---------------------------------------*) IMPORT WINUSER; IMPORT WIN32; IMPORT WINX; IMPORT WINGDI; IMPORT SYSTEM; CONST szAppName = "Bezier"; VAR hwnd : WIN32.HWND; msg : WINUSER.MSG; wc : WINUSER.WNDCLASSEX; VAR apt : ARRAY[0..4] OF WIN32.POINT; hdc : WIN32.HDC; cxClient : INTEGER; cyClient : INTEGER; ps : WINUSER.PAINTSTRUCT; (*++++*****************************************************************) PROCEDURE DrawBezier (hdc : WIN32.HDC; apt : ARRAY OF WIN32.POINT); (**********************************************************************) BEGIN WINGDI.PolyBezier (hdc, apt, 4); WINGDI.MoveToEx (hdc, apt[0].x, apt[0].y, WINX.NIL_POINT); WINGDI.LineTo (hdc, apt[1].x, apt[1].y); WINGDI.MoveToEx (hdc, apt[2].x, apt[2].y, WINX.NIL_POINT); WINGDI.LineTo (hdc, apt[3].x, apt[3].y); END DrawBezier; <*/PUSH*> %IF WIN32 %THEN <*/CALLS:WIN32SYSTEM*> %ELSE <*/CALLS:WINSYSTEM*> %END (*++++*****************************************************************) PROCEDURE WndProc(hwnd : WIN32.HWND; (**********************************************************************) iMsg : WIN32.UINT; wParam : WIN32.WPARAM; lParam : WIN32.LPARAM) : WIN32.LRESULT [EXPORT]; BEGIN CASE (iMsg) OF | WINUSER.WM_SIZE: cxClient := WINUSER.LOWORD (lParam); cyClient := WINUSER.HIWORD (lParam); apt[0].x := cxClient / 4; apt[0].y := cyClient / 2; apt[1].x := cxClient / 2; apt[1].y := cyClient / 4; apt[2].x := cxClient / 2; apt[2].y := 3 * cyClient / 4; apt[3].x := 3 * cxClient / 4; apt[3].y := cyClient / 2; RETURN 0; | WINUSER.WM_MOUSEMOVE: IF ((wParam BAND WINUSER.MK_LBUTTON)=1) OR ((wParam BAND WINUSER.MK_RBUTTON)=1) THEN hdc := WINUSER.GetDC (hwnd); WINGDI.SelectObject (hdc, WINGDI.GetStockObject (WINGDI.WHITE_PEN)); DrawBezier (hdc, apt); IF (wParam BAND WINUSER.MK_LBUTTON=1) THEN apt[1].x := WINUSER.LOWORD (lParam); apt[1].y := WINUSER.HIWORD (lParam); END; IF (wParam BAND WINUSER.MK_RBUTTON=1) THEN apt[2].x := WINUSER.LOWORD (lParam); apt[2].y := WINUSER.HIWORD (lParam); END; WINGDI.SelectObject (hdc, WINGDI.GetStockObject (WINGDI.BLACK_PEN)); DrawBezier (hdc, apt); WINUSER.ReleaseDC (hwnd, hdc); END; RETURN 0; | WINUSER.WM_PAINT: WINUSER.InvalidateRect (hwnd, WINX.NIL_RECT, TRUE); hdc := WINUSER.BeginPaint (hwnd, ps); DrawBezier (hdc, apt); WINUSER.EndPaint (hwnd, ps); RETURN 0; | WINUSER.WM_DESTROY: WINUSER.PostQuitMessage (0); RETURN 0; ELSE RETURN WINUSER.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; <*/POP*> (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) VAR rc : CARDINAL; BEGIN wc.cbSize := SIZE(wc); wc.style := WINUSER.CS_HREDRAW BOR WINUSER.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := WINX.Instance; wc.hIcon := WINUSER.LoadIcon (NIL, WINUSER.IDI_APPLICATION^); wc.hCursor := WINUSER.LoadCursor (NIL, WINUSER.IDC_ARROW^); wc.hbrBackground := SYSTEM.CAST(WIN32.HBRUSH, WINGDI.GetStockObject (WINGDI.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := WINUSER.LoadIcon (NIL,WINUSER.IDI_APPLICATION^); rc := WINUSER.RegisterClassEx(wc); RETURN rc#0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := WINUSER.CreateWindow ( szAppName, (* window class name *) "Bezier Splines: Translation to Stony Brook Modula-2", (* window caption *) WINUSER.WS_OVERLAPPEDWINDOW, (* window style *) WINUSER.CW_USEDEFAULT, (* initial x position *) WINUSER.CW_USEDEFAULT, (* initial y position *) WINUSER.CW_USEDEFAULT, (* initial x size *) WINUSER.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) wc.hInstance, (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; WINUSER.ShowWindow (hwnd, WINUSER.SW_SHOWDEFAULT); WINUSER.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (WINUSER.GetMessage(msg,NIL,0,0)) DO WINUSER.TranslateMessage(msg); WINUSER.DispatchMessage(msg); END; END; END Bezier.