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[strategies] Add less-comparator for projected_point_ax result in detail::douglas_peucker

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This commit is contained in:
Adam Wulkiewicz 2014-07-08 21:16:18 +02:00
parent 282a2536a3
commit e49434ec6c
1 changed files with 18 additions and 3 deletions
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21
include/boost/geometry/strategies/cartesian/distance_projected_point_ax.hpp
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@ -67,12 +67,27 @@ struct projected_point_ax_result
{} {}
T atd, xtd; T atd, xtd;
};
friend bool operator>(projected_point_ax_result const& left, // This less-comparator may be used as a parameter of detail::douglas_peucker.
projected_point_ax_result const& right) // In this simplify strategy distances are compared in 2 places
// 1. to choose the furthest candidate (md < dist)
// 2. to check if the candidate is further than max_distance (max_distance < md)
template <typename Distance>
class projected_point_ax_less
{
public:
projected_point_ax_less(Distance const& max_distance)
: m_max_distance(max_distance)
{}
template <typename T>
inline bool operator()(Distance const& left, Distance const& right) const
{ {
return left.atd > right.atd || left.xtd > right.xtd; return left.xtd < right.xtd && right.atd < m_max_distance.atd;
} }
private:
Distance const& m_max_distance;
}; };
// This strategy returns 2-component Point/Segment distance. // This strategy returns 2-component Point/Segment distance.