Dear All,
We were just compiling Boost Geometry Extension using VS 2017 64 bit and Warning Level 4.
Doing that showed a few warnings regarding size_t to int conversions which you might want to change.
It is in the file:
..\boost\geometry\extensions\algorithms\detail\overlay\dissolver.hpp
Line 436:
int n = boost::size(output_collection);
and Line 580
int size = 0, previous_size = 0;
We assume that both should be size_t.
Thanks a lot for all your hard work
Johan
Best regards,  
Johan Doré
 

M:
+45 40 53 93 21 
From: Geometry <geometrybounces@lists.boost.org>
On Behalf Of Chris Watts via Geometry
Sent: 31. december 2020 10:32
To: geometry@lists.boost.org
Cc: Chris Watts <Chris@cjwatts.com>
Subject: [geometry] Polygons appear to have serious rounding errors
Hi all,
I've been trying to debug an issue with geographic_point_circle wherein I can't seem to create a circle of radius 10 metres.
The easytoreproduce symptom is that the area of the circle varies greatly with only a small change in latitude or longitude.
See this StackOverflow post for details: https://stackoverflow.com/questions/65493910/boostpointcirclecomingoutinweirdshapes/
In order to produce a suitable circle of that scale, I need to use
long double in my point type, but with an epsilon of ~1mm, a regular
double ought to work fine. Is there something I'm missing about the implementation of
point_circle or
bg::area that would imply that this is expected behaviour?
Kind regards,
Chris