At the moment there is a commandline switch
(-reduce-point-density=xxx) which allows you to set the dp error
distance for each call. It should be doable with nearly no effort to
introduce a second option for polygon settings.
Just added a patch with an additional option
'reduce-point-density-polygon=xxx', which allows to set different dp
settings for polygons.
This patch is for testing only, it is not be meant to be checked in.
Index: src/uk/me/parabola/mkgmap/build/MapBuilder.java
===================================================================
--- src/uk/me/parabola/mkgmap/build/MapBuilder.java (Revision 1473)
+++ src/uk/me/parabola/mkgmap/build/MapBuilder.java (Arbeitskopie)
@@ -110,6 +110,7 @@
private String regionAbbr;
private double reducePointError;
+ private double reducePointErrorPolygon;
private boolean mergeLines;
private int locationAutofillLevel;
@@ -131,6 +132,9 @@
regionName = props.getProperty("region-name", null);
regionAbbr = props.getProperty("region-abbr", null);
reducePointError = props.getProperty("reduce-point-density", 2.6);
+ reducePointErrorPolygon = props.getProperty("reduce-point-density-polygon", -1);
+ if (reducePointErrorPolygon == -1)
+ reducePointErrorPolygon = reducePointError;
mergeLines = props.containsKey("merge-lines");
makePOIIndex = props.getProperty("make-poi-index", false);
@@ -924,8 +928,8 @@
filters.addFilter(new SizeFilter());
//DouglasPeucker behaves at the moment not really optimal at low zooms, but acceptable.
//Is there an similar algorithm for polygons?
- if(reducePointError > 0)
- filters.addFilter(new DouglasPeuckerFilter(reducePointError));
+ if(reducePointErrorPolygon > 0)
+ filters.addFilter(new DouglasPeuckerFilter(reducePointErrorPolygon));
}
filters.addFilter(new PolygonSplitterFilter());
filters.addFilter(new RemoveEmpty());
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