Last updated: 18. 1.1998, 10:24
<* +M2EXTENSIONS *> MODULE SineWave; (*----------------------------------------- SINEWAVE.C --- Sine Wave Using Polyline (c) Charles Petzold, 1996 SineWave.mod --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 -----------------------------------------*) IMPORT Windows; IMPORT SYSTEM; IMPORT Lib; IMPORT RealMath; CONST NUM = 1000; CONST TWOPI = (2.0 * 3.14159); CONST szAppName = "SineWave"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; cxClient : INTEGER; cyClient : INTEGER; (*++++*****************************************************************) PROCEDURE [Windows.CALLBACK] WndProc(hwnd : Windows.HWND; (**********************************************************************) iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; VAR hdc : Windows.HDC; i : INTEGER; ps : Windows.PAINTSTRUCT; pt : ARRAY[0..NUM] OF Windows.POINT; BEGIN CASE (iMsg) OF | Windows.WM_SIZE: cxClient := Windows.LOWORD (lParam); cyClient := Windows.HIWORD (lParam); RETURN 0; | Windows.WM_PAINT: hdc := Windows.BeginPaint (hwnd, ps); Windows.MoveToEx (hdc, 0, cyClient / 2, NIL); Windows.LineTo (hdc, cxClient, cyClient / 2); FOR i := 0 TO NUM-1 DO pt[i].x := i * cxClient / NUM; pt[i].y := VAL(INTEGER,(FLOAT(cyClient) / 2.0 * (1.0 - RealMath.sin(TWOPI * FLOAT(i) / FLOAT(NUM))))); END; Windows.Polyline (hdc, pt, NUM); 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, (* window class name *) "Sine Wave Using Polyline: Translation to XDS Modula-2", (* window caption *) Windows.WS_OVERLAPPEDWINDOW, (* window style *) Windows.CW_USEDEFAULT, (* initial x position *) Windows.CW_USEDEFAULT, (* initial y position *) Windows.CW_USEDEFAULT, (* initial x size *) Windows.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) Windows.MyInstance(), (* program instance handle *) NIL); (* creation parameters *) 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 SineWave.