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[geometry] Add check on duplicate sections to avoid them being intersected,

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unless the only one
This commit is contained in:
Barend Gehrels
2013-12-04 10:41:27 +01:00
parent bc5d9366f5
commit c4bb879d79
1 changed files with 10 additions and 0 deletions
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10
include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
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@@ -174,6 +174,16 @@ public :
{
boost::ignore_unused_variable_warning(interrupt_policy);
if ((sec1.duplicate && (sec1.count + 1) < sec1.range_count)
|| (sec2.duplicate && (sec2.count + 1) < sec2.range_count))
{
// Skip sections containig only duplicates.
// They are still important (can indicate non-disjointness)
// but they will be found processing adjacent sections.
// Do NOT skip if they are the ONLY section
return true;
}
cview_type1 cview1(range_by_section(geometry1, sec1));
cview_type2 cview2(range_by_section(geometry2, sec2));
view_type1 view1(cview1);