[Boost-bugs] [Boost C++ Libraries] #10019: Difference of Linestring and Box returns their intersection

Subject: [Boost-bugs] [Boost C++ Libraries] #10019: Difference of Linestring and Box returns their intersection
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-05-07 22:47:49

#10019: Difference of Linestring and Box returns their intersection
-----------------------------------------+---------------------------
 Reporter:  brandonesbox@…               |      Owner:  barendgehrels
     Type:  Bugs                         |     Status:  new
Milestone:  To Be Determined             |  Component:  geometry
  Version:  Boost 1.55.0                 |   Severity:  Problem
 Keywords:  difference, linestring, box  |
-----------------------------------------+---------------------------
 Taking the difference of a linestring and a box returns their
 intersection. This is demonstrated by the program below:

 ---------------
 #include <boost/geometry/geometry.hpp>
 #include <boost/geometry/multi/geometries/multi_linestring.hpp>
 #include <boost/geometry/geometries/register/box.hpp>
 #include <iostream>

 namespace bg = boost::geometry;

 int main()
 {
     typedef bg::model::point<double, 2, bg::cs::cartesian> Point;
     typedef bg::model::linestring<Point> Linestring;
     typedef bg::model::multi_linestring<Linestring> MultiLinestring;
     typedef bg::model::box<Point> Box;

     Linestring ls;
     bg::read_wkt("LINESTRING (20 20, 20 45, 30 30, 50 50)", ls);

     Point min_corner;
     bg::read_wkt("POINT(25 25)", min_corner);
     Point max_corner;
     bg::read_wkt("POINT(42 42)", max_corner);
     Box box(min_corner, max_corner);

     MultiLinestring ml_diff;
     bg::difference(ls, box, ml_diff);
     std::cout << "line box difference: " << bg::wkt(ml_diff) << std::endl;
 }
 ----------------

 Which outputs

 line box difference: MULTILINESTRING((25 37.5,30 30,42 42))

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10019>
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