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[mkgmap-dev] [PATCH v1] - round coordinates when zoomed out

From Felix Hartmann extremecarver at googlemail.com on Tue Nov 17 11:11:35 GMT 2009

Mark Burton wrote:
> Hi Felix,
> Many thanks for taking the time to try that patch.
> Your results are interesting because I don't see those issues with
> the maps I am testing.
> So, please tell me for the examples you sent, what mapsource zoom
> level are those images shown at (i.e. what is the scale distance in the
> corner of the image) and also what is the OSM URL for the second
> location (B18 + railway) because I haven't been able to locate that one.
> Cheers,
> Mark
Well I just discovered that my decreasing of douglas peucker algorithm 
from 2.6 to 1.3 might have been responsible.

I just kicked that out (using only your fill-line patch) and fewer holes 
than before. I will try again the round coordinates patch without my 
changes to douglas peucker algorithm.
Attached the douglas peucker filter patch that I had been using, maybe 
they were responsible for the problems?
Actually using Filter_Distance = 5.4: could be working even better - the 
straighter the line - the less holes (I just don't know whether 5.4 
wouldn't be so much, that when using your GPS far zoomed out you have 
the problem of driving besides the street instead of on the street (like 
when using the GPS inbuilt basemap).

The other reason could be that the "double line" is defined via typfile 
to be out of center

Index: src/uk/me/parabola/mkgmap/build/MapBuilder.java
--- src/uk/me/parabola/mkgmap/build/MapBuilder.java    (revision 1379)
+++ src/uk/me/parabola/mkgmap/build/MapBuilder.java    (working copy)
@@ -110,7 +110,7 @@
     private boolean    poiAddresses = true;
     private int        poiDisplayFlags;
     private boolean sortRoads = true;
-    private static final double FILTER_DISTANCE = 2.6;
+    private static final double FILTER_DISTANCE = 1.3;
     private boolean enableLineCleanFilters = true;
     private boolean makePOIIndex = false;
     private int routeCenterBoundaryType = 0;
Index: src/uk/me/parabola/mkgmap/osmstyle/ActionRule.java

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