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/* bzflag
* Copyright (c) 1993 - 2008 Tim Riker
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/**
* TimeKeeper:
* Standard way to keep track of time in game.
*
* Generally, only the difference between TimeKeeper's is useful.
* operator-() computes the difference in seconds as a float and
* correctly handles wraparound.
* operator+=() allows a time in seconds to be added to a TimeKeeper.
*/
#ifndef BZF_TIME_KEEPER_H
#define BZF_TIME_KEEPER_H
#include "common.h"
/* system interface headers */
#include <string>
/** TimeKeeper keeps time. It's useful to determine how much time has
* elapsed from some other point in time. Use getCurrent() to return a
* timekeeper object set to the current time. You can then use subsequent
* calls to getCurrent and subtract the second from the first to get an
* elapsed float time value.
*/
class TimeKeeper {
public:
TimeKeeper();
TimeKeeper(const TimeKeeper&);
~TimeKeeper();
TimeKeeper& operator=(const TimeKeeper&);
double operator-(const TimeKeeper&) const;
bool operator<=(const TimeKeeper&) const;
TimeKeeper& operator+=(double);
TimeKeeper& operator+=(const TimeKeeper&);
// make a TimeKeeper with seconds = NULL act like unset
// Fixme: must this be defined here? didn't work for me outside the class
inline operator void*()
{
if (seconds > 0.0)
return this;
else
return NULL;
}
/** returns how many seconds have elapsed since epoch, Jan 1, 1970 */
double getSeconds(void) const;
/** returns a timekeeper representing the current time */
static const TimeKeeper& getCurrent(void);
/** returns a timekeeper representing the time of program execution */
static const TimeKeeper& getStartTime(void);
/** sets the time to the current time (recalculates) */
static void setTick(void);
/** returns a timekeeper that is updated periodically via setTick */
static const TimeKeeper& getTick(void); // const
/** returns a timekeeper representing +Inf */
static const TimeKeeper& getSunExplodeTime(void);
/** returns a timekeeper representing -Inf */
static const TimeKeeper& getSunGenesisTime(void);
/** returns a timekeeper representing an unset timekeeper */
static const TimeKeeper& getNullTime(void);
/** returns the local time */
static void localTime(int *year = NULL, int *month = NULL, int* day = NULL, int* hour = NULL, int* min = NULL, int* sec = NULL, bool* dst = NULL);
/** returns a string of the local time */
static const char *timestamp(void);
static void localTime( int &day);
/** converts a time difference into an array of integers
representing days, hours, minutes, seconds */
static void convertTime(double raw, long int convertedTimes[]);
/** prints an integer-array time difference in human-readable form */
static const std::string printTime(long int timeValue[]);
/** prints an float time difference in human-readable form */
static const std::string printTime(double diff);
/** sleep for a given number of floating point seconds */
static void sleep(double secs); //const
private:
double seconds;
static TimeKeeper currentTime;
static TimeKeeper tickTime;
static TimeKeeper sunExplodeTime;
static TimeKeeper sunGenesisTime;
static TimeKeeper nullTime;
static TimeKeeper startTime;
};
//
// TimeKeeper
//
inline TimeKeeper::TimeKeeper() : seconds(0.0)
{
// do nothing
}
inline TimeKeeper::TimeKeeper(const TimeKeeper& t) :
seconds(t.seconds)
{
// do nothing
}
inline TimeKeeper::~TimeKeeper()
{
// do nothing
}
inline TimeKeeper& TimeKeeper::operator=(const TimeKeeper& t)
{
seconds = t.seconds;
return *this;
}
inline double TimeKeeper::operator-(const TimeKeeper& t) const
{
return seconds - t.seconds;
}
inline TimeKeeper& TimeKeeper::operator+=(double dt)
{
seconds += dt;
return *this;
}
inline TimeKeeper& TimeKeeper::operator+=(const TimeKeeper& t)
{
seconds += t.seconds;
return *this;
}
inline bool TimeKeeper::operator<=(const TimeKeeper& t) const
{
return seconds <= t.seconds;
}
inline double TimeKeeper::getSeconds(void) const
{
return seconds;
}
#endif // BZF_TIME_KEEPER_H
// Local Variables: ***
// mode: C++ ***
// tab-width: 8 ***
// c-basic-offset: 2 ***
// indent-tabs-mode: t ***
// End: ***
// ex: shiftwidth=2 tabstop=8
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