merge-lines is as discussed quite problematic, because it happens after
the routing notes are placed, and therefore causes some problems. The
closer you zoom in, the bigger these problems, while the further you
zoom out, the bigger the speed improvement of using this option (at
resolution 24 and 23 it makes basically no difference) and the smaller
the problems (22 vs 24 means 1/4 of the wrong distance for info popup or
jumping map when panning).
There was a discussion about this - archive here:
http://www.mail-archive.com/[email protected]/msg07262.html
This patch is working pretty well and makes --merge-lines usable. I have
been using it since back then without any probs. So for as long as
merge-lines cannot be implemented before creation of the routing nodes
(which according to the discussion is really difficult) this tiny patch
is great.
Index: uk/me/parabola/mkgmap/build/MapBuilder.java
===================================================================
--- uk/me/parabola/mkgmap/build/MapBuilder.java (revision 1871)
+++ uk/me/parabola/mkgmap/build/MapBuilder.java (working copy)
@@ -876,13 +876,13 @@
//TODO: Maybe this is the wrong place to do merging.
// Maybe more efficient if merging before creating subdivisions.
- if (mergeLines && res < 24) {
+ if (mergeLines && res < 22) {
LineMergeFilter merger = new LineMergeFilter();
lines = merger.merge(lines);
}
LayerFilterChain filters = new LayerFilterChain(config);
- if (enableLineCleanFilters && (res < 24)) {
+ if (enableLineCleanFilters && (res < 22)) {
filters.addFilter(new PreserveHorizontalAndVerticalLinesFilter());
filters.addFilter(new RoundCoordsFilter());
filters.addFilter(new SizeFilter());
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