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{
Free Pascal port of the OpenPTC C++ library.
Copyright (C) 2001-2003, 2006, 2007, 2009-2011 Nikolay Nikolov (nickysn@users.sourceforge.net)
Original C++ version by Glenn Fiedler (ptc@gaffer.org)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
type
TPTCTimer = class(TInterfacedObject, IPTCTimer)
private
FOld: Double;
FTime: Double;
FStart: Double;
FCurrent: Double;
FRunning: Boolean;
{$IF defined(WIN32) OR defined(WIN64)}
FFrequency: QWord;
{$ENDIF defined(WIN32) OR defined(WIN64)}
function Clock: Double;
procedure internal_init_timer;
public
constructor Create;
constructor Create(ATime: Double);
// constructor Create(ATimer: IPTCTimer);
destructor Destroy; override;
{ procedure Assign(const ATimer: TPTCTimer);
function Equals(const ATimer: TPTCTimer): Boolean;}
procedure SetTime(ATime: Double); {was 'set' in the C++ version}
procedure Start;
procedure Stop;
function Time: Double;
function Delta: Double;
function Resolution: Double;
end;
class function TPTCTimerFactory.CreateNew: IPTCTimer;
begin
Result := TPTCTimer.Create;
end;
class function TPTCTimerFactory.CreateNew(ATime: Double): IPTCTimer;
begin
Result := TPTCTimer.Create(ATime);
end;
{Function timeGetTime: DWord; StdCall; external 'WINMM' name 'timeGetTime';}
constructor TPTCTimer.Create;
begin
internal_init_timer;
FOld := 0;
FTime := 0;
FStart := 0;
FCurrent := 0;
FRunning := False;
end;
constructor TPTCTimer.Create(ATime: Double);
begin
internal_init_timer;
FOld := 0;
FTime := 0;
FStart := 0;
FCurrent := 0;
FRunning := False;
SetTime(ATime);
end;
{constructor TPTCTimer.Create(ATimer: IPTCTimer);
begin
internal_init_timer;
FOld := ATimer.FOld;
FTime := ATimer.FTime;
FStart := ATimer.FStart;
FCurrent := ATimer.FCurrent;
FRunning := ATimer.FRunning;
end;
}
destructor TPTCTimer.Destroy;
begin
Stop;
inherited Destroy;
end;
{procedure TPTCTimer.Assign(const ATimer: TPTCTimer);
begin
if Self = ATimer then
exit;
FOld := ATimer.FOld;
FTime := ATimer.FTime;
FStart := ATimer.FStart;
FCurrent := ATimer.FCurrent;
FRunning := ATimer.FRunning;
end;
function TPTCTimer.Equals(const ATimer: TPTCTimer): Boolean;
begin
Result := (FOld = ATimer.FOld) and (FTime = ATimer.FTime) and
(FStart = ATimer.FStart) and (FCurrent = ATimer.FCurrent) and
(FRunning = ATimer.FRunning);
end;
}
procedure TPTCTimer.SetTime(ATime: Double);
begin
FCurrent := ATime;
FStart := Clock;
FTime := FStart + ATime;
FOld := FTime - Delta;
end;
procedure TPTCTimer.Start;
begin
if not FRunning then
begin
FStart := Clock;
FOld := Clock;
FRunning := True;
end;
end;
procedure TPTCTimer.Stop;
begin
FRunning := False;
end;
function TPTCTimer.Time: Double;
var
_time: Double;
begin
if FRunning then
begin
_time := Clock;
if _time > FTime then
FTime := _time;
FCurrent := FTime - FStart;
end;
Result := FCurrent;
end;
function TPTCTimer.Delta: Double;
var
_time: Double;
_delta: Double;
begin
if FRunning then
begin
_time := Clock;
_delta := _time - FOld;
FOld := _time;
if _delta < 0 then
_delta := 0;
Result := _delta;
end
else
Result := 0;
end;
function TPTCTimer.Resolution: Double;
begin
{$IFDEF GO32V2}
Result := TimerResolution;
{$ENDIF GO32V2}
{$IF defined(Win32) OR defined(Win64)}
Result := 1 / FFrequency;
{ Result := 1 / 1000;}
{$ENDIF defined(Win32) OR defined(Win64)}
{$IFDEF WinCE}
Result := 1 / 1000;
{$ENDIF WinCE}
{$IFDEF UNIX}
Result := 1 / 1000000;
{$ENDIF UNIX}
end;
procedure TPTCTimer.internal_init_timer;
{$IF defined(WIN32) OR defined(WIN64)}
var
_freq: QWord;
{$ENDIF defined(WIN32) OR defined(WIN64)}
begin
{$IF defined(WIN32) OR defined(WIN64)}
QueryPerformanceFrequency(PLARGE_INTEGER(@_freq));
FFrequency := _freq;
{$ENDIF defined(WIN32) OR defined(WIN64)}
end;
{$IFDEF GO32V2}
function TPTCTimer.Clock: Double;
begin
Result := GetClockTics() * TimerResolution;
end;
{$ENDIF GO32V2}
{$IF defined(WIN32) OR defined(WIN64)}
function TPTCTimer.Clock: Double;
var
_time: QWord;
begin
QueryPerformanceCounter(PLARGE_INTEGER(@_time));
Result := _time / FFrequency;
{ Result := timeGetTime / 1000;}
end;
{$ENDIF defined(WIN32) OR defined(WIN64)}
{$IFDEF WinCE}
function TPTCTimer.Clock: Double;
begin
Result := GetTickCount / 1000;
end;
{$ENDIF WinCE}
{$IFDEF UNIX}
function TPTCTimer.Clock: Double;
var
tm: TimeVal;
begin
fpGetTimeOfDay(@tm, nil);
Result := tm.tv_sec + (Double(tm.tv_usec)) / 1000000;
end;
{$ENDIF UNIX}
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