使用boost::geometry::union_ 合并边界（内、外）- 方案一

使用boost::geometry::union_ 合并边界（内、外）：方案一

结合 boost::geometry::read_wkt() 函数

#include <iostream>
#include <vector>#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>#include <boost/foreach.hpp>int main()
{typedef boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double> > polygon;polygon polygon1, polygon2;std::string str_points_of_cur_frame_data = "POLYGON((1.500000 1.500000,1.500000 2.500000,2.500000 2.500000,2.500000 1.500000,1.500000 1.500000))";std::string str_points_of_compared_frame_data = "POLYGON((1.000000 1.000000,1.000000 2.000000,2.000000 2.000000,2.000000 1.000000,1.000000 1.000000))";boost::geometry::read_wkt(str_points_of_cur_frame_data, polygon1);boost::geometry::read_wkt(str_points_of_compared_frame_data, polygon2);std::vector<polygon> output;boost::geometry::union_(polygon1, polygon1, output);//通过验证：与传入的顺序无关，均返回相同的结果。std::vector<Point> vctr_combined ;if (!r.empty())//有结果返回{for (auto & pt : output.outer()){vctr_combined.push_back(pt);}}    std::cout << "vctr_combined.size()  = " << vctr_combined.size() << std::endl;for(auto iter : vctr_combined){std::cout << "iter.x  = " << iter.x << ", iter.y  = " << iter.y << std::endl;}return 0;
}