
Geometry : 
Subject: Re: [geometry] Distance between point_ll and polygon in 1.56
From: Branimir Betov (bbetov_at_[hidden])
Date: 20140810 13:52:30
I did some more experimentation and seems like distance between point and a
polygon only works for Cartesian coordinates. I tried spherical,
sperical_equatorial, and geographic  none work, but Cartesian compiles
fine and returns a distance.
I guess some specialization is missing, but I am not sure how to solve it.
On Sat, Aug 9, 2014 at 9:07 AM, Branimir Betov <bbetov_at_[hidden]> wrote:
> Here is the full example I came up with. I am using visual studio (tried
> 2010, 2012, and 2013). For completeness I am attaching a file with the
> polygon definition (test.txt).
>
> #include "stdafx.h"
> #include <string>
> #include <fstream>
> #include <streambuf>
> #include <boost/geometry.hpp>
> #include "boost/geometry/geometry.hpp"
> #include <boost/geometry/extensions/gis/latlong/point_ll.hpp>
> #include <boost/geometry/io/io.hpp>
>
> namespace bg = boost::geometry;
> using namespace std;
>
>
> typedef bg::model::ll::point<> point;
> typedef bg::model::polygon<point> polygon;
>
> int _tmain(int argc, _TCHAR* argv[])
> {
> polygon poly;
> std::string str;
>
> std::ifstream t("c:\\temp\\test.txt");
>
> t.seekg(0, std::ios::end);
> str.reserve(t.tellg());
> t.seekg(0, std::ios::beg);
>
> str.assign((std::istreambuf_iterator<char>(t)),
> std::istreambuf_iterator<char>());
>
>
> bg::read_wkt(str, poly);
>
> const bg::latitude<double> lat_out(37.69311);
> const bg::longitude<double> lon_out(122.13865);
> point p_out(lat_out, lon_out);
>
> bg::distance(poly, p_out); // This fails to compile for some reason.
>
> return 0;
> }
>
>
>
>
> On Sat, Aug 9, 2014 at 12:12 AM, Menelaos Karavelas <
> menelaos.karavelas_at_[hidden]> wrote:
>
>> Hi Branimir.
>>
>>
>> On 09/08/2014 05:26 Ï€Î¼, Branimir Betov wrote:
>>
>> Hi,
>>
>> I am trying to figure out what is wrong with my code and am stuck, so I
>> thought someone might help. The code used to work in 1.55 and in 1.56 no
>> longer compiles; I am at a loss what might be wrong. I am using the GIS
>> extension from the develop1.56 branch.
>>
>> Here is the relevant snippet:
>>
>> typedef bg::model::ll::point<> point;
>> typedef bg::model::polygon<point> polygon;
>>
>> polygon poly;
>>
>> bg::read_wkt(str, poly);
>>
>> const bg::latitude<double> lat_out(37.69311);
>> const bg::longitude<double> lon_out(122.13865);
>> point p_out(lat_out, lon_out);
>>
>> bg::distance(p_out, poly); // It fails to compile right here.
>>
>>
>> Does anyone have any suggestions?
>>
>>
>> Would it be possible to provide a minimal complete example that fails?
>>
>> Thanks a lot.
>>
>>  m.
>>
>>
>> Thank you,
>> Branimir
>>
>>
>>
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>>
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>
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