Last updated: 20. 2.1998, 23: 3
<* +M2EXTENSIONS *>
MODULE AnaClock;
(*-----------------------------------------
ANACLOCK.C --- Analog Clock Program
(c) Charles Petzold, 1996
AnaClock.mod --- Translation to XDS Modula-2
(c) Peter Stadler, 1998
-----------------------------------------*)
IMPORT Windows;
IMPORT SYSTEM;
IMPORT SysClock;
IMPORT Str;
IMPORT RealMath;
IMPORT Lib;
CONST ID_TIMER = 1;
CONST TWOPI = 2.0 * 3.14159;
CONST szAppName = "DigClock";
VAR
cxClient : INTEGER;
cyClient : INTEGER;
(*static in WndProc *)
dtPrevious : SysClock.DateTime;
datetime : SysClock.DateTime;
VAR
hwnd : Windows.HWND;
msg : Windows.MSG;
wc : Windows.WNDCLASSEX;
iDHAngle : ARRAY[0..2] OF INTEGER;
TYPE
PTARRAY = ARRAY[0..2],[0..4] OF Windows.POINT;
CONST(* static in DrawHands *)
pt = PTARRAY
{
{
{0, -150},{100, 0},{0, 600},{-100, 0},{0, -150}
},
{
{0, -200},{50, 0},{0, 800},{-50, 0},{0, -200}
},
{
{0, 0},{0, 0},{0, 0},{0, 0},{0, 800}
}
};
(*++++*****************************************************************)
PROCEDURE SetIsotropic (hdc : Windows.HDC;
(**********************************************************************)
cxClient : INTEGER;
cyClient : INTEGER);
BEGIN
Windows.SetMapMode (hdc, Windows.MM_ISOTROPIC);
Windows.SetWindowExtEx (hdc, 1000, 1000, NIL);
Windows.SetViewportExtEx (hdc, cxClient DIV 2, -cyClient DIV 2, NIL);
Windows.SetViewportOrgEx (hdc, cxClient DIV 2, cyClient DIV 2, NIL);
END SetIsotropic;
(*++++*****************************************************************)
PROCEDURE RotatePoint (VAR pt : ARRAY OF Windows.POINT;
(**********************************************************************)
iNum : INTEGER;
iAngle : INTEGER);
VAR
i : INTEGER;
ptTemp : Windows.POINT;
BEGIN
FOR i := 0 TO iNum-1 DO
ptTemp.x := VAL(INTEGER,(FLOAT(pt[i].x) * RealMath.cos (TWOPI * FLOAT(iAngle)/ 360.)) +
FLOAT(pt[i].y) * RealMath.sin (TWOPI * FLOAT(iAngle)/ 360.));
ptTemp.y := VAL(INTEGER,(FLOAT(pt[i].y) * RealMath.cos (TWOPI * FLOAT(iAngle)/ 360.)) -
FLOAT(pt[i].x) * RealMath.sin (TWOPI * FLOAT(iAngle)/ 360.));
pt[i] := ptTemp;
END;
END RotatePoint;
(*++++*****************************************************************)
PROCEDURE DrawClock (hdc : Windows.HDC);
(**********************************************************************)
VAR
iAngle : INTEGER;
pt : ARRAY[0..2] OF Windows.POINT;
BEGIN
FOR iAngle := 0 TO 360-1 BY 6 DO
pt[0].x := 0;
pt[0].y := 900;
RotatePoint (pt, 1, iAngle);
IF(iAngle REM 5 #0) THEN
pt[2].x := 33;
pt[2].y := 33;
ELSE
pt[2].x := 100;
pt[2].y := 100;
END;
pt[0].x := pt[0].x - pt[2].x DIV 2;
pt[0].y := pt[0].y - pt[2].y DIV 2;
pt[1].x := pt[0].x + pt[2].x;
pt[1].y := pt[0].y + pt[2].y;
Windows.SelectObject (hdc, Windows.GetStockObject (Windows.BLACK_BRUSH));
Windows.Ellipse (hdc, pt[0].x, pt[0].y, pt[1].x, pt[1].y);
END;
END DrawClock;
(*++++*****************************************************************)
PROCEDURE DrawHands (hdc : Windows.HDC;
(**********************************************************************)
datetime : SysClock.DateTime;
bChange : BOOLEAN);
VAR
i : INTEGER;
ptTemp: ARRAY[0..2],[0..4] OF Windows.POINT;
BEGIN
iDHAngle[0] := (datetime.hour * 30) REM 360 + datetime.minute DIV 2;
iDHAngle[1] := datetime.minute * 6;
iDHAngle[2] := datetime.second * 6;
SYSTEM.MOVE(SYSTEM.ADR(pt),SYSTEM.ADR(ptTemp), SIZE(pt));
IF(bChange=TRUE) THEN
FOR i := 0 TO 3-1 DO
RotatePoint (ptTemp[i], 5, iDHAngle[i]);
Windows.Polyline (hdc, ptTemp[i], 5);
END;
ELSE
FOR i := 2 TO 3-1 DO
RotatePoint (ptTemp[i], 5, iDHAngle[i]);
Windows.Polyline (hdc, ptTemp[i], 5);
END;
END;
END DrawHands;
(*++++*****************************************************************)
PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND;
(**********************************************************************)
iMsg : Windows.UINT;
wParam : Windows.WPARAM;
lParam : Windows.LPARAM) : Windows.LRESULT;
VAR
hdc : Windows.HDC;
ps : Windows.PAINTSTRUCT;
bChange: BOOLEAN;
BEGIN
CASE (iMsg) OF
| Windows.WM_CREATE :
SysClock.GetClock(datetime);
dtPrevious := datetime;
RETURN 0;
| Windows.WM_SIZE :
cxClient := Windows.LOWORD (lParam);
cyClient := Windows.HIWORD (lParam);
RETURN 0;
| Windows.WM_TIMER :
SysClock.GetClock(datetime);
bChange := (datetime.hour # dtPrevious.hour) OR
(datetime.minute # dtPrevious.minute);
hdc := Windows.GetDC (hwnd);
SetIsotropic (hdc, cxClient, cyClient);
Windows.SelectObject (hdc, Windows.GetStockObject (Windows.WHITE_PEN));
DrawHands (hdc, dtPrevious, bChange);
Windows.SelectObject (hdc, Windows.GetStockObject (Windows.BLACK_PEN));
DrawHands (hdc, datetime, TRUE);
Windows.ReleaseDC (hwnd, hdc);
dtPrevious := datetime;
RETURN 0;
| Windows.WM_PAINT :
hdc := Windows.BeginPaint (hwnd, ps);
SetIsotropic (hdc, cxClient, cyClient);
DrawClock (hdc);
DrawHands (hdc, dtPrevious, TRUE);
Windows.EndPaint (hwnd, ps);
RETURN 0;
| Windows.WM_DESTROY :
Windows.KillTimer (hwnd, ID_TIMER);
Windows.PostQuitMessage (0);
RETURN 0;
ELSE
RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam);
END;
END WndProc;
(*++++*****************************************************************)
PROCEDURE InitApplication () : BOOLEAN;
(**********************************************************************)
VAR
rc : CARDINAL;
BEGIN
wc.cbSize := SIZE(wc);
wc.style := Windows.CS_HREDRAW + Windows.CS_VREDRAW;
wc.lpfnWndProc := WndProc;
wc.cbClsExtra := 0;
wc.cbWndExtra := 0;
wc.hInstance := Windows.MyInstance();
wc.hIcon := NIL;
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 := NIL;
rc := Windows.RegisterClassEx(wc);
RETURN rc#0;
END InitApplication;
(*++++*****************************************************************)
PROCEDURE InitMainWindow () : BOOLEAN;
(**********************************************************************)
BEGIN
hwnd := Windows.CreateWindow (szAppName,
"Analog Clock: Translation to XDS Modula-2",
Windows.WS_OVERLAPPEDWINDOW,
Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT,
Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT,
NIL,
NIL,
Windows.MyInstance(),
NIL);
WHILE(Windows.SetTimer (hwnd, ID_TIMER, 1000, NIL)=0) DO
Windows.MessageBox (hwnd,
"Too many clocks or timers!",
szAppName,
Windows.MB_ICONEXCLAMATION + Windows.MB_OK);
RETURN FALSE;
END;
Windows.ShowWindow (hwnd, Windows.SW_SHOWNOACTIVATE);
(*????*)
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 AnaClock.