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[algorithms][is_simple] fix bug in is_simple(multilinestring): is_simple

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was considering a simple closed linestring (living inside a multilinestring)
as non-simple because it was wrongly detecting the turn associated with the
first and last (closing) point as an unacceptable turn;
fix: allow such turns acceptable;
This commit is contained in:
Menelaos Karavelas
2015-01-28 12:40:46 +02:00
parent 2f0b9d05bd
commit 5899ac451f
1 changed files with 20 additions and 0 deletions
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20
include/boost/geometry/algorithms/detail/is_simple/linear.hpp
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@@ -93,6 +93,19 @@ private:
|| geometry::equals(point, range::back(linestring)) );
}
template <typename Point, typename Linestring>
static inline bool is_closing_point_of(Point const& point,
Linestring const& linestring)
{
BOOST_ASSERT( boost::size(linestring) > 1 );
return
geometry::equals(range::front(linestring),
range::back(linestring))
&&
geometry::equals(range::front(linestring), point)
;
}
template <typename Linestring1, typename Linestring2>
static inline bool have_same_boundary_points(Linestring1 const& ls1,
Linestring2 const& ls2)
@@ -130,6 +143,13 @@ private:
range::at(m_multilinestring,
turn.operations[1].seg_id.multi_index);
if (turn.operations[0].seg_id.multi_index
== turn.operations[1].seg_id.multi_index)
{
BOOST_ASSERT(is_closing_point_of(turn.point, ls1));
return true;
}
return
is_boundary_point_of(turn.point, ls1)
&& is_boundary_point_of(turn.point, ls2)