[mkgmap-dev] [PATCH] make gps report correct exit when routing through roundabouts

Wed Feb 11 22:34:47 GMT 2009

On Feb 11, 2009, at 17:19, Robert Vollmert wrote:
> Something along these lines might help (doesn't as is, but no time):

This compiles, at least, and probably does what I want:

Index: src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java
===================================================================

--- src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java	(revision  
877)
+++ src/uk/me/parabola/imgfmt/app/trergn/LinePreparer.java	(working  
copy)
@@ -200,8 +200,12 @@
  				continue;
  			}

-			int dx = lon - lastLong;
-			int dy = lat - lastLat;
+			// calculate normalized differences
+			int max = 1 << (24-shift);
+			int dx = (lon - lastLong) % (1 << (24-shift));
+			if (dx >= max/2) dx -= max/2;
+			int dy = (lat - lastLat) % (1 << (24-shift));
+			if (dy >= max/2) dy -= max/2;

  			lastLong = lon;
  			lastLat = lat;


