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Copy pathbg_helpers.hpp
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146 lines (134 loc) · 5.37 KB
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#ifndef BG_HELPERS_H
#define BG_HELPERS_H
template <typename polygon_type_t, typename rhs_t>
static inline bg::model::multi_polygon<polygon_type_t> operator-(const bg::model::multi_polygon<polygon_type_t>& lhs,
const rhs_t& rhs) {
if (bg::area(rhs) <= 0) {
return lhs;
}
bg::model::multi_polygon<polygon_type_t> ret;
bg::difference(lhs, rhs, ret);
return ret;
}
template <typename polygon_type_t, typename rhs_t>
static inline bg::model::multi_polygon<polygon_type_t> operator+(const bg::model::multi_polygon<polygon_type_t>& lhs,
const rhs_t& rhs) {
if (bg::area(rhs) <= 0) {
return lhs;
}
bg::model::multi_polygon<polygon_type_t> ret;
bg::union_(lhs, rhs, ret);
return ret;
}
template <typename polygon_type_t, typename rhs_t>
static inline bg::model::multi_polygon<polygon_type_t> operator^(const bg::model::multi_polygon<polygon_type_t>& lhs,
const rhs_t& rhs) {
if (bg::area(rhs) <= 0) {
return lhs;
}
if (bg::area(lhs) <= 0) {
return rhs;
}
bg::model::multi_polygon<polygon_type_t> ret;
bg::sym_difference(lhs, rhs, ret);
return ret;
}
template <typename polygon_type_t, typename rhs_t>
static inline bg::model::multi_polygon<polygon_type_t> operator&(const bg::model::multi_polygon<polygon_type_t>& lhs,
const rhs_t& rhs) {
bg::model::multi_polygon<polygon_type_t> ret;
if (bg::area(rhs) <= 0) {
return ret;
}
if (bg::area(lhs) <= 0) {
return ret;
}
bg::intersection(lhs, rhs, ret);
return ret;
}
template <typename point_type_t, typename rhs_t>
static inline multi_polygon_type_fp operator&(const bg::model::polygon<point_type_t>& lhs,
const rhs_t& rhs) {
multi_polygon_type_fp ret;
if (bg::area(rhs) <= 0) {
return ret;
}
if (bg::area(lhs) <= 0) {
return ret;
}
bg::intersection(lhs, rhs, ret);
return ret;
}
namespace bg_helpers {
// The below implementations of buffer are similar to bg::buffer but
// always convert to floating-point before doing work, if needed, and
// convert back afterward, if needed. Also, they work if expand_by is
// 0, unlike bg::buffer.
static const int points_per_circle = 30;
template<typename CoordinateType>
void buffer(multi_polygon_type_fp const & geometry_in, multi_polygon_type_fp & geometry_out, CoordinateType expand_by) {
if (expand_by == 0) {
bg::convert(geometry_in, geometry_out);
} else {
bg::buffer(geometry_in, geometry_out,
bg::strategy::buffer::distance_symmetric<coordinate_type>(expand_by),
bg::strategy::buffer::side_straight(),
bg::strategy::buffer::join_round(points_per_circle),
bg::strategy::buffer::end_round(points_per_circle),
bg::strategy::buffer::point_circle(points_per_circle));
}
}
template<typename CoordinateType>
void buffer(polygon_type_fp const & geometry_in, multi_polygon_type_fp & geometry_out, CoordinateType expand_by) {
if (expand_by == 0) {
bg::convert(geometry_in, geometry_out);
} else {
bg::buffer(geometry_in, geometry_out,
bg::strategy::buffer::distance_symmetric<coordinate_type>(expand_by),
bg::strategy::buffer::side_straight(),
bg::strategy::buffer::join_round(points_per_circle),
bg::strategy::buffer::end_round(points_per_circle),
bg::strategy::buffer::point_circle(points_per_circle));
}
}
template<typename CoordinateType>
void buffer(polygon_type const & geometry_in, multi_polygon_type_fp & geometry_out, CoordinateType expand_by) {
if (expand_by == 0) {
bg::convert(geometry_in, geometry_out);
} else {
polygon_type_fp geometry_in_fp;
bg::convert(geometry_in, geometry_in_fp);
buffer(geometry_in_fp, geometry_out, expand_by);
}
}
template<typename CoordinateType>
void buffer(multi_linestring_type const & geometry_in, multi_polygon_type & geometry_out, CoordinateType expand_by) {
multi_linestring_type_fp geometry_in_fp;
bg::convert(geometry_in, geometry_in_fp);
multi_polygon_type_fp geometry_out_fp;
bg::buffer(geometry_in_fp, geometry_out_fp,
bg::strategy::buffer::distance_symmetric<coordinate_type>(expand_by),
bg::strategy::buffer::side_straight(),
bg::strategy::buffer::join_round(points_per_circle),
bg::strategy::buffer::end_round(points_per_circle),
bg::strategy::buffer::point_circle(points_per_circle));
bg::convert(geometry_out_fp, geometry_out);
}
template<typename CoordinateType>
void buffer(ring_type_fp const & geometry_in, multi_polygon_type_fp & geometry_out, CoordinateType expand_by) {
if (expand_by == 0) {
bg::convert(geometry_in, geometry_out);
} else {
polygon_type_fp geometry_in_fp;
bg::convert(geometry_in, geometry_in_fp);
multi_polygon_type_fp geometry_out_fp;
bg::buffer(geometry_in_fp, geometry_out,
bg::strategy::buffer::distance_symmetric<coordinate_type>(expand_by),
bg::strategy::buffer::side_straight(),
bg::strategy::buffer::join_round(),
bg::strategy::buffer::end_round(),
bg::strategy::buffer::point_circle());
}
}
} // namespace bg_helpers
#endif //BG_HELPERS_H