#pragma once
#include <Eigen/Core>
#include <cstring>
namespace meshless {
	template <int dim>
	void writePntVTK(const std::string& path, const Eigen::MatrixXd& pnts, const std::vector<double>& attri) {
		std::ofstream out(path);
		out << "# vtk DataFile Version 3.0\n"
			"Volume Mesh\n"
			"ASCII\n"
			"DATASET UNSTRUCTURED_GRID"
			<< std::endl;
		out << "POINTS " << pnts.rows() << " float" << std::endl;
		for(int i = 0; i < pnts.rows(); ++i) {
			for(int j = 0; j < dim; ++j) {
				out << std::setprecision(4) << pnts(i, j) << " ";
			}
			for(int j = dim; j < 3; ++j) {
				out << "0 ";
			}
			out << std::endl;
		}
		int innersize = 0;
		int interSize = 0;
		int bounSize = 0;

		out << "CELLS " << pnts.rows() << " " << pnts.rows() * (1 + 1) << std::endl;
		for(int i = 0; i < pnts.rows(); ++i) {
			out << "1 " << i << std::endl;
		}
		out << "CELL_TYPES " << pnts.rows() << std::endl;
		for(int i = 0; i < pnts.rows(); ++i) {
			out << 1 << std::endl;
		}

		if(!attri.empty()) {
			out << "POINT_DATA " << attri.size() << "\n"
				<< "SCALARS point_scalars double 1\n"
				<< "LOOKUP_TABLE default" << std::endl;
			for(auto& d : attri) {
				out << d << std::endl;
				if(d == 1)
					innersize++;
				else
					bounSize++;
			}
		}
		std::cout << "内部点： " << innersize << "\n";
		std::cout << "边界点： " << bounSize << "\n";
	}



};