Re: [Boost-users] Boost.Geometry, probable bug in point_on_surface

10 Oct 2014

      Hi Adam,

thank for your answer. I have created a ticket:

https://svn.boost.org/trac/boost/ticket/10643

Regards,
Petr

----- Original Message -----
From: Adam Wulkiewicz
[mailto:adam.wulkiewicz@gmail.com]
To: boost-users@lists.boost.org
Sent:
Thu, 09 Oct 2014 16:44:04 +0100
Subject: Re: [Boost-users] Boost.Geometry,
probable bug in point_on_surface
...
Hi Petr,
I'll top-post because there is only code below.
You're right, something's wrong with point_on_surface().
Could you please create a ticket: 
http://www.boost.org/development/bugs.html ?
FYI, your WKT POLYGON is CCW but you're creating a CW one using default 
template parameters of model::polygon<>.
Regards,
Adam
Petr Doubrava wrote:
...
#include 
#include 
#include 
void test_point_on_surface()
   {
       typedef boost::geometry::model::point Point;
       boost::geometry::model::polygon<Point> poly;
boost::geometry::read_wkt("POLYGON((1074699.93 703064.65,
1074702.10 703054.62, 1074704.53 703061.40, 1074703.90 703064.58, 1074699.93
703064.65))",poly);
       boost::geometry::correct(poly);
Point point;
       boost::geometry::point_on_surface(poly,point);
//computed point isn't on the surface of polygon
       //[0]    1074839.1013086310 double
       //[1]    703154.77900308778 double
bool res = boost::geometry::within(point,poly);
       // res is false
   }
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