pxmlw6n2f/Gazebo_Distributed/gazebo/common/Timer.cc

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/*
* Copyright (C) 2012 Open Source Robotics Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* Desc: A timer class
* Author: Nate Koenig
* Date: 22 Nov 2009
*/
#include "gazebo/common/Timer.hh"
using namespace gazebo;
using namespace common;
//////////////////////////////////////////////////
Timer::Timer()
: reset(true), running(false), countdown(false)
{
}
//////////////////////////////////////////////////
Timer::Timer(const Time &_maxTime, const bool _countdown)
: reset(true), running(false), countdown(_countdown), maxTime(_maxTime)
{
}
//////////////////////////////////////////////////
Timer::~Timer()
{
}
//////////////////////////////////////////////////
void Timer::Start()
{
if (this->reset)
{
this->start = Time::GetWallTime();
this->reset = false;
}
else if (!this->running)
{
// Add the time that has elapsed since stopping to the start time.
this->start += (Time::GetWallTime() - this->stop);
}
this->running = true;
}
//////////////////////////////////////////////////
void Timer::Stop()
{
this->stop = Time::GetWallTime();
this->running = false;
}
//////////////////////////////////////////////////
void Timer::Reset()
{
this->running = false;
this->reset = true;
this->start = this->stop = Time::GetWallTime();
}
//////////////////////////////////////////////////
bool Timer::GetRunning() const
{
return this->running;
}
//////////////////////////////////////////////////
Time Timer::GetElapsed() const
{
Time elapsedTime;
if (this->running)
{
elapsedTime = Time::GetWallTime() - this->start;
}
else
{
elapsedTime = this->stop - this->start;
}
// If we're counting down, return the countdown time minus the total
// elapsed time.
if (this->countdown)
{
if (elapsedTime > this->maxTime)
{
// If elapsed time is past the countdown time, return 0 (out of time)
return Time::Zero;
}
return this->maxTime - elapsedTime;
}
return elapsedTime;
}