Timer?

[SkyLu]

Hi everyone
Just curious if I need to postpone execution of a function by 5 seconds, should I use a timer?
And if yes, could I place the timer on PANEL_SERVICE_PRE_UPDATE or somewhere else?

Thank you very much)

 

[JB3DG]

You can use this function wherever you like.

http://www.fsdeveloper.com/wiki/index.php?title=C:_C++_timers

 

[SkyLu]

@ Naruto-kun thank you for a quick reply
how can i handle it?
something like:

void FSAPI test_f(...)
{
switch(...)
 case PANEL_SERVICE_PRE_UPDATE:
  double time1 = GetSimTime6();
  double time2 = GetSimTime6()+5;

 if(time1 ==  time2)
  {
   execute_calculation_code(" 1 (>L:vis_test, bool)", NULL, NULL, NULL)
  }
break;
}

sorry for that dumb question and example
before i never work with time at all

Thank you )

 

[JB3DG]

make a global double called old_time or something like that.

double time = GetSimTime6();

if(time-old_time >= 5)
{
   //do stuff
   old_time = time;
}

 

[Dietmar]

Hi,
another good way to deal with timer functions is using increment ticks, like this :

80 83 (A:Airspeed indicated,knots) rng (* Example trigger event*)

if{ (G:Var1) ++ (>G:Var1) } (*increment count.=One tick is 60 ms *)

(G:Var1) 45 > (* after 45 ticks= 3 sec the (G:Var2 will set to TRUE*)

if{ 0 (>G:Var1) 1 (>G:Var2) } (* trigger (G:Var2, is true after 3 sec*)

So, no timer variables are in use. To me an easy way to solve triggers with timer functions.

Dietmar

 

[taguilo]

Dietmar,

This thread refers to C++ timers.

And XML timers has been extensively discussed. For example:

http://www.fsdeveloper.com/forum/threads/adding-a-timer.431123/#post-681273
http://www.fsdeveloper.com/forum/threads/a-simple-pause-sensitive-timer.431243/#post-682164

Basic increment count works fine for very simple timers. Those written like in your example are buggy if sim rate and pause state are not taken into account.

Tom

 

[mgh]

An aternative high-resolution C++ timer

//-----------------------------------------------------------------------------
//  Variables in .h file
LARGE_INTEGER Tick;
LARGE_INTEGER StartingTime;
LARGE_INTEGER EndingTime;
double StartingTicks;
double EndTicks;
double Ticks;
double Start;
double End;
double ElapsedTime;

//-----------------------------------------------------------------------------
// Get the system tick rate - needed only once on startup
QueryPerformanceFrequency(&Tick);
Ticks = Tick.QuadPart;

//-----------------------------------------------------------------------------
// Sample code to Get ElapsedTime between EndingTime and StartingTime events
//Get system Start time
QueryPerformanceCounter(&StartingTime);
Start =  StartingTime.QuadPart / Ticks;

// Code to be timed here ....

//Get system End time
QueryPerformanceCounter(&EndingTime);
End =  EndingTime.QuadPart / Ticks;

// Elapsed time
ElapsedTime = End - Start;