Hello Ivan,
> I think I found where my extended-type lines disappear. They are simply not
> taken into account when estimating subdivision size, i.e:
>
> MapArea.java, lines 389-394
>
> private void addSize(MapElement p, int[] sizes, int kind) {
>
> -> if(p.hasExtendedType()) {
> -> // not applicable for elements with extended types
> -> return;
> -> }
>
> So subdivisions end up too big (and are not drawn correctly) if there are a
> lot of extended-type elements. I commented out above lines in MapArea.java,
> rebuilt mkgmap (r1274) and seems to work, i.e. extended lines are no longer
> dropped in i.e. MapSource.
>
> I am not sure if I am breaking anything else, so please, somebody who
> understands the code and implications more, please check this.
Extended type elements are not stored in the subdivision in the same
manner as the non-extended elements so it is not appropriate to take
their sizes into account in the same way as the elements with
non-extended types.
However, there could well be some limit to the amount of extended type
elements that a subdivision has. The offsets and sizes are 32 bit but
that doesn't mean to say you can have huge amounts of those elements in
a single subdivision.
I could introduce some threshold that would cause a subdivision to be
split if the extended type elements are larger than that.
Cheers,
Mark
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