
Geometry : 
Subject: [geometry] problem with wkt io
From: lepere renaud (lepere.renaud_at_[hidden])
Date: 20131009 15:00:07
I am using read_wkt to read wkt polygons and wkt to convert them to
string but i have some problems. I though that wkt polygons should have
the last point equal to the first one ; however in my model polygons are
not closed. The function read_wkt and wkt do not handle the last point,
is this normal or did i missed something ?
A small code to illustrate the problem.
#include "boost/geometry.hpp"
#include "boost/geometry/geometries/geometries.hpp"
#include "boost/geometry/io/wkt/wkt.hpp"
using namespace boost::geometry;
typedef model::point< double, 2, boost::geometry::cs::cartesian > Point;
typedef model::polygon< Point, false, false > Polygon;
int main()
{
Polygon p;
read_wkt("POLYGON((0.0 0.0, 10.0 0.0, 10.0 10.0, 0 10.0, 0.0
0.0))", p);
// p is invalid according to the definition above
// (do not repeat last point)
correct(p);
std::cout << p.outer().size() << std::endl;
// i thought that wkt impose last point to be equal to the
// first one. this is not the case here.
std::cout << wkt(p) << std::endl;
return 0;
}
Thanks,
Renaud
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