[GraphHopper] Get direction of an edge using CH

[Robert Schmid]

Okay, sorry I don't get it.
We store the height of each node in the graph. When we route we 
calculate the hight difference between base- and adjacent node (in our 
customized weightCalc) of the edges.
How can i be sure to use the right sign for the height difference 
[heightDiff *= (reverse ? -1 : 1)]     ?
The reverse boolean is where the magic happens. But how? (see comment in 
your mail below)

Thanks in advance,

Regards,
Robert

Am 28.10.2013 12:50, schrieb Peter K:
> If you need it in WeightCalculation you can additionally pass e.g. the
> baseNode for the 'direction' of the iterator state:
>
> getWeight( EdgeIteratorState edge ) {
>     return getHeight(edge.getEdgeId, edge.getBaseNode)
> }
>

> Keep in mind that the direction of the edge iterator does not
> necessarily reflect the direction of a street. It it just the direction
> of the exploration of the graph:
>
> base<-----adjacent1  #how to get the direction of the arrow (base ----> adj [edge access not reverse], base <---- adj [reverse])
>     \---> adj2
>      \_ adj3
>
> Regards,
> Peter.
>
>> Since we route height-data weights we need to know in which direction
>> we're entering/visiting the edge. It matters because we need to know
>> if we're going up or down. The path object is not yet created (during
>> routing process).
>>
>> Thanks in advance,
>>
>> Robert
>>
>> Am 28.10.2013 11:11, schrieb Peter K:
>>> What is your usecase? In the latest version the edgeId list will be
>>> hidden in the Path object.
>>>
>>> Peter.
>>>
>>>
>>>> Hi Peter,
>>>>
>>>> I need to find out in which direction i am passing the edges while
>>>> routing using contraction hierarchies. Is there an easy way to get the
>>>> direction?
>>>> The Graphhopper version i'm using is from 18th of September.
>>>> Sorry, i am sure that this question has been answered many times ;)
>>>>
>>>> Thanks in advance,
>>>>
>>>> Robert
>
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