omnet++ - Difference between getCurrentPosition() and getPositionAt(time) in Veins -


i'm using veins 4.4, omnet++ 5.0 , sumo 0.25.

i use traci->getcurrentposition() actual position of vehicle, i.e., traci->getcurrentposition().x , traci->getcurrentposition().y.

i want estimate position of vehicle @ specific time in order have positions of vehicle's trajectory.

so, use function traci->getpositionat(time) , set simtime_t time = simtime()+60 position of vehicle after 60 s. current position!

what difference between getcurrentposition() , getpositionat(time)?

how can position of vehicle's trajectory?

below have implementations of functions have mentioned. can see in first case comment getpositionat() says:

it intended passed simtime() actualtime , returns actual position.

seems these functions not cover case @ all.

you can see how these functions work @ move.h. comments detailed enough too

/**  * @brief returns position of move (host) @ specified point in time.  * intended passed simtime() actualtime , returns actual position.  *  * assumes direction represents normalized vector (length equals 1.0).  * further function not check whether given time point before  * starttime of actual move pattern. in case 1 might obtain  * unintended result.  *  */ virtual coord getpositionat(simtime_t_cref actualtime = simtime()) const {     // if speed close 0.0, host practically standing still     if ( fwmath::close(speed, 0.0) ) return startpos;      // otherwise: actualpos = startpos + ( direction * v * t )     return startpos + ( direction * speed * simtime_dbl(actualtime - starttime) ); } virtual const coord& getcurrentposition() const {     if (lastpos.z != dbl_max)         return lastpos;     return startpos; }

getpositionat() implemented @ tracimobility.h as:

    virtual coord getpositionat(const simtime_t& t) const {         return move.getpositionat(t) ;     }

and getcurrentposition() implemented @ basemobility.h as:

/** @brief returns current position @ current simulation time. */ virtual coord getcurrentposition(/*simtime_t_cref stwhen = simtime()*/) const {     //return move.getpositionat(stwhen);     return move.getstartpos(); }

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