[mkgmap-dev] Relations and roles

Fri Jul 10 19:43:09 BST 2009

> I want to show road signs for restrictions. So I tried the following:

> 

> relations:

> type=restriction { apply { set relation_restriction='${restriction}' 

> }}

> 

> points:

> relation_restriction=only_straight_on [0x300f level 0]

> 

> This creates a sign at the crossing. But I'd prefer to see the sign at 

> the 'from' part of the relation. So I added the following line to the 

> file

> polygons:

> relation_restriction=only_straight_on [0x21 level 0]

> 

> In this case I get 3 signs for every restriction (from, via, to). 

> (This is a 'hack' to get a POI for a way with --add-pois-to-areas. The 

> polygon is not displayed because the way consists of 2 nodes).

> 

> How can I restrict the POI to the 'from' member of the relation? The 

> following line doesn't work because 'role' doesn't belong to the 

> relation, it belongs to the members of the relation:

> 

> type=restriction & role=from { apply { set 

> relation_restriction='${restriction}' }}

> 

> Rudi

> 

Now I found the solution by looking at the source code:

route=from solves my problem:

type=restriction { apply route=from { set
relation_restriction='${restriction}' }}

Now only the members of the relation with the specified role get the tag.

Rudi

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