Hi,
I have created the branch style-functions to implement functions like
mkgmap::length that can be used in the style system.
The mkgmap::length function is the first one that has been implemented.
It returns the length of a way in metre. For relations it returns the
sum of way length of all members.
The function can be used like a tag name:
highway=* & access=private & mkgmap::length < 10 { delete highway }
Calculations are cached. So the mkgmap::length is calculated not more
than once per element.
Known bugs:
- Rules with a function must always contain a tag rule. Otherwise the
optimizer disposes the rule. so the rule
mkgmap::length < 10 { delete highway }
will never be executed.
- The length of relations does not always makes sense. E.g. the length
of turn restrictions, multipolygons maybe should be not calculated.
Steve: can you have a look on it and give your comment if the
implementation looks good to you and what you dislike and what you want
to change :-) Can you please also give a hint how I can tell the
optimizer that functions should always be treated as an existing tag.
Do you think it makes more sense to implement the functions as an
additional operator?
I am free to change the implementation completely :-)
WanMil
_______________________________________________
mkgmap-dev mailing list
[email protected]
http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
