[mkgmap-dev] overlays

Fri Feb 17 08:31:31 GMT 2012

There is not much difference. Overlays existed before continue command 
was implemented, and therefore still exists.
Sometimes it needs less lines if you use overlay command instead of 
continue. On the other hand it might get more confusing when you edit 
your style and is less flexible. (as there is "continue" and "continue 
with actions").

The syntax is very simple. You set a code in your normal lines file (it 
only works for lines I think).
eg.
0x101 and reference that with the overlay you want to have drawn in the 
overlays file.
e.g.
0x101: 0x13, 0x16, 0x34

I'm not sure what references you can set. I would think 0x?? and 0x???? 
and 0x????? is not allowed as it could be a real type to. Also maybe 
another "x" is forbidden?? So use different names for overlay reference.

On 17.02.2012 09:01, Martin Ždila wrote:
> Hello
>
> First thanks for a great tool how mkgmap is!
>
> I'd like to know something more about overlays. First, from the
> documentation I can't figure out how to work with it and what is the
> real purpose of overlays. It is written that overlays are "Used where
> you want a single way to be converted to two ways in the output map".
> How does it differ from multiple rules in "lines" matching single way,
> assigning it different Garmin types and then "continue"?
>
> Also I don't understand the "overlays" syntax and semantics. Could you
> please explain it a bit more?
>
> Thanks in advance
> Best regards