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R: [mkgmap-dev] [PATCH v3] - beware of the bollards!

From Mark Burton markb at ordern.com on Wed Jul 8 10:49:30 BST 2009


> I still do not see the reason to make 2 unaccessible arcs on both sides instead of one.

Imagine that you have only one restricted arc that is on one side of
the bollard. Now if you are within that region and try to route to a
point that is on the other side of the bollard, it will route straight
through the bollard because you are leaving the restricted area and not
entering it. If you have two restricted areas, one each side of the
bollard and your starting point is within one of the areas, it will now
not route through the bollard if the destination is outside of the
restricted area on the other side of the bollard.

As previously mentioned, the case where both start and destination are
within the restricted area does not work right and, currently, I don't
have a plan for fixing this. I can't see how that can be achieved.



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