FIFE  2008.0
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timeprovider.cpp
1 /***************************************************************************
2  * Copyright (C) 2005-2008 by the FIFE team *
3  * http://www.fifengine.de *
4  * This file is part of FIFE. *
5  * *
6  * FIFE is free software; you can redistribute it and/or *
7  * modify it under the terms of the GNU Lesser General Public *
8  * License as published by the Free Software Foundation; either *
9  * version 2.1 of the License, or (at your option) any later version. *
10  * *
11  * This library is distributed in the hope that it will be useful, *
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
14  * Lesser General Public License for more details. *
15  * *
16  * You should have received a copy of the GNU Lesser General Public *
17  * License along with this library; if not, write to the *
18  * Free Software Foundation, Inc., *
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
20  ***************************************************************************/
21 
22 // Standard C++ library includes
23 
24 // 3rd party library includes
25 
26 // FIFE includes
27 // These includes are split up in two parts, separated by one empty line
28 // First block: files included from the FIFE root src directory
29 // Second block: files included from the same folder
30 #include "util/base/exception.h"
31 #include "util/time/timemanager.h"
32 
33 #include "timeprovider.h"
34 
35 namespace FIFE {
37  m_master(master),
38  m_multiplier(1.0) {
39  m_time_static = m_time_scaled = master ? master->getGameTime() : TimeManager::instance()->getTime();
40  }
41 
42  TimeProvider::~TimeProvider() {}
43 
44  void TimeProvider::setMultiplier(float multiplier) {
45  if (multiplier < 0.0) {
46  throw NotSupported("Negative time multiplier are not supported");
47  }
48  m_time_static = getPreciseGameTime();
49  m_time_scaled = m_master ? m_master->getPreciseGameTime() : static_cast<float>(TimeManager::instance()->getTime());
50  m_multiplier = multiplier;
51  }
52 
53  float TimeProvider::getMultiplier() const {
54  return m_multiplier;
55  }
56 
58  if (m_master) {
59  return m_master->getTotalMultiplier() * m_multiplier;
60  } else {
61  return m_multiplier;
62  }
63  }
64 
65  uint32_t TimeProvider::getGameTime() const {
66  return static_cast<uint32_t>(getPreciseGameTime());
67  }
68 
69  double TimeProvider::getPreciseGameTime() const {
70  return m_time_static + m_multiplier * ((m_master ? m_master->getPreciseGameTime() : static_cast<float>(TimeManager::instance()->getTime())) - m_time_scaled);
71  }
72 
73  uint32_t scaleTime(float multiplier, uint32_t ticks) {
74  return static_cast<uint32_t>(static_cast<float>(ticks) * multiplier);
75  }
76 }