[Boost-bugs] [Boost C++ Libraries] #10642: polygon_set_data<int> bug with small coordinates

Subject: [Boost-bugs] [Boost C++ Libraries] #10642: polygon_set_data<int> bug with small coordinates
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-10-09 18:49:43

#10642: polygon_set_data<int> bug with small coordinates
---------------------------------------------+----------------------
 Reporter:  "Patrick LoPresti" <lopresti@…>  |      Owner:  ljsimons
     Type:  Bugs                             |     Status:  new
Milestone:  To Be Determined                 |  Component:  polygon
  Version:  Boost 1.56.0                     |   Severity:  Problem
 Keywords:                                   |
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 The attached test program creates a small polygon with a hole and adds it
 to a polygon_set_data<int>. The internal representation of the polygon set
 is rather messed up, as you can confirm by calling .get() or
 .get_trapezoids().

 This test program demonstrates the bug by comparing the area of the
 polygon to the area of a polygon set containing that single polygon. The
 area of the polygon is correctly computed as 32; the area of the polygon
 set is incorrectly computed as 30.

 Doubling all coordinates avoids the bug.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/10642>
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