Re: [sumo-user] question on MSVehicle::gap2pred

[Daniel K. <d.k...@go...>]

Dear Lei,

Well, there is no member "pred" in the MSVehicle class, so you
probably have to compute it by yourself.

Are you planning to implement this directly in the c++ code?
Then you may go along the lane's (MSLane) vehicles
(MSLane::myVehicles) and find the predecessor for a vehicle.

sincerely,
Daniel


2010/10/18 Lei Chenxi <che...@ya...>:
> Dear Daniel,
> Thanks for your answer. I would like to implement a vehicle-tracking
> algorithm initially on a single straight lane, therefore I need to know
> whether I can directly use such as the "pred" (object of the class "vehicle"
> defined in MSVehicle) and correspondent functions such as "gap2pred". I
> guess your answer is yes.
>
>
>
> Best regards,
>
> Chenxi
>
> ________________________________
> From: Daniel Krajzewicz <d.k...@go...>
> To: Lei Chenxi <che...@ya...>
> Cc: sum...@li...
> Sent: Mon, October 18, 2010 4:13:51 PM
> Subject: Re: [sumo-user] question on MSVehicle::gap2pred
>
> Dear Lei,
>
> vehicles are stored in a lane-internal container (I think called
> myVehicles). They are sorted by their position, starting with the last
> (the one at the begin of the lane) vehicle. During the simulation, the
> items of this container are iterated and as they are sorted, you can
> get the leader (pred) at the iterator+1 position.
> This of course does not hold for the first vehicle on the lane (the
> one at the lane's end). Actually, even the other vehicles have to
> iterate over the succeeding lanes to determine whether there is a
> leader on their successive lanes. This is done by iterating over the
> lanes-vector stored in the "bestlanes" (LaneQ) structure of the
> vehicle's current lane. Also, the links and internal lanes must be
> taken into account. Probably the best way for getting an insight is to
> take a look at MSVehicle::vsafeCriticalCont()
>
> What do you want to achieve?
>
> sincerely,
> Daniel
>
>
>
> 2010/10/11 Lei Chenxi <che...@ya...>:
>> Hello everyone,
>> I have a question on 'pred' of the "MSVehicle::gap2pred". Since 'pred' is
>> defined as the closest preceding vehicle, how can sumo itself identify
>> which
>> vehicle should be 'pred'? If it can, please tell me where the
>> correspondent code
>> is. Or should I write an algorithm myself to identify that?
>>
>>
>> Thanks.
>> Best regards,
>> Chenxi
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Beautiful is writing same markup. Internet Explorer 9 supports
>> standards for HTML5, CSS3, SVG 1.1,  ECMAScript5, and DOM L2 & L3.
>> Spend less time writing and  rewriting code and more time creating great
>> experiences on the web. Be a part of the beta today.
>> http://p.sf.net/sfu/beautyoftheweb
>> _______________________________________________
>> sumo-user mailing list
>> sum...@li...
>> https://lists.sourceforge.net/lists/listinfo/sumo-user
>>
>
>