[mkgmap-dev] Problem with routing to a destination at oneway

Wed Feb 18 14:42:37 GMT 2009

On Feb 18, 2009, at 15:25, Mark Burton wrote:
>> What's dirindicator supposed to do, anyway? I'm thinking that maybe
>> the dirindicator and one-way flags shouldn't be treated as  
>> independent
>> flags, just that some applications check NET for oneway-ness, while
>> others check NOD.
>
> This is what the cGPSMapper doc says about it:
>
> DirIndicator=#     Direction indicator, only for streets, highways,  
> etc.
>                      0 no direction
>                      1 the GPS will show direction of the road  
> (calculated
>                      internally by GPS)
>                      Default = 0
>
> When I originally read that, I thought that it was saying something  
> about
> how the gps displayed the road, rather than affecting the routing  
> logic.

Yes, that's what I thought, too.

It turns out we're writing direction info in three places:
1. a flag in RGN (Polyline.FLAG_DIR)
2. a flag in NET (RoadDef.FLAG_DIR_INDICATOR)
3. a flag in Table A in NOD (RoadDef.TABA_FLAG_ONEWAY)

Maybe I got the DirIndicator<->NET connection wrong, and DirIndicator  
should just be set on the polyline. Since the polyline is what's  
rendered, that would make a lot of sense. Then 2. and 3. would both be  
oneway-ness.

I'll make the change.

Cheers
Robert