c++ - 通过 boost 图将 vector 变量导出到图形

Question

我想导出一个存储字符串值序列的 vector 以 boost 图形(点文件)。 .最后四行可以解释问题/所需的帮助。我知道代码有误，但需要指导方针来解决这个问题。我想将 vector toponodedist2 存储到图形点文件。这里我想存储一个数组/vector ，它将值序列存储在索引处，如 (image01、image02、iamge 03 ....)。稍后我将通过 write_graphviz_dp 将此 vector 导出到点文件。谢谢

#include<iostream>
#include<boost/graph/adjacency_list.hpp>
#include<boost/graph/graphviz.hpp>
#include<boost/graph/properties.hpp>
#include<boost/graph/property_maps/container_property_map.hpp>
#include<boost/graph/named_function_params.hpp>
#include <cstdlib>
#include<fstream>

struct VertexData
{

    std:: string image_path;
        int id;
    int image_num;
        std:: vector<std::vector<std::string>> toponodedist2;

};



int main(int,char*[])
{

    VertexData v11;


    std:: vector<std::vector<std::string>> toponodedist;
    std:: vector<std::string> toponodedist1;
    toponodedist1.push_back("this");
    toponodedist1.push_back("This is first node2");
    toponodedist1.push_back("This is first node3");
    v11.toponodedist2.push_back(toponodedist1);
    toponodedist.push_back(toponodedist1);
    toponodedist1.clear();
    toponodedist1.push_back("This is first node1");
    toponodedist1.push_back("This is first node2");
    toponodedist1.push_back("This is first node3");
    toponodedist.push_back(toponodedist1);
     v11.toponodedist2.push_back(toponodedist1);

    for(int i=0;i<=2;i++)
        for(int j=0;j<=2;j++)
        std::cout<< "this is "<<v11.toponodedist2[i][j]<<std::endl;

    /// mention vertex data in declaring adjacency list
    typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, VertexData,boost::no_property> MyGraphType;

    MyGraphType G;
    auto v1 =add_vertex(G);
    auto v2 =add_vertex(G);
    auto v3 =add_vertex(G);
    auto v4 =add_vertex(G);
    auto v5 =add_vertex(G);
    auto v6 =add_vertex(G);
    auto v7 =add_vertex(G);
    auto v8 =add_vertex(G);
    auto v9 =add_vertex(G);
        auto e1 =add_edge(v1,v2,G);
        auto e2 =add_edge(v2,v3,G);
        auto e3 =add_edge(v3,v4,G);
    auto e4 =add_edge(v4,v5,G);
        auto e5 =add_edge(v5,v6,G);
        auto e6 =add_edge(v7,v7,G);
        auto e7 =add_edge(v5,v2,G);
        auto e8 =add_edge(v1,v4,G);
        auto e9 =add_edge(v3,v7,G);
        auto e10 =add_edge(v2,v7,G);
        auto e11 =add_edge(v2,v6,G);
        auto vpair=vertices(G);
        int numberOfInEdges = boost::out_degree(8,G);

        std::cout<< "The number of vertices are  "<<numberOfInEdges; 
      ;

      std::ofstream dotfile1;
     dotfile1.open("dotgraph1.txt", std::ios::app);

      boost::dynamic_properties dp;

    dp.property("node_id", get(&VertexData::id, G));
// this is the place where I need help to export toponodeist2 to graph dot
 // file  ditfile1, but I am not able to do it. thanks    
dp.property("path_Ismage", get(&VertexData::toponodedist2, G));
/// the line need to be addressed

    boost::write_graphviz_dp(dotfile1,G,dp);
    dotfile1.close();

  return 0;
}

Answer 1

只需将属性转换为某种形式的字符串，例如:

dp.property("toponodedist", boost::make_transform_value_property_map(topo_attr, get(boost::vertex_index, g)));

例如

auto topo_attr = [&g](MyGraphType::vertex_descriptor const& v) {
    auto& vd = g[v];
    std::string s;
    for (auto& row : vd.topo) {
        for (auto& el : row) s += el + " ";
        s += '\n';
    }
    return s;
};

Live On Coliru

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/property_map/transform_value_property_map.hpp>
#include <fstream>
#include <iostream>
#include <sstream>

using string_table = std::vector<std::vector<std::string>>;

struct VertexData {
    std::string image_path;
    int id;
    int image_num;
    string_table topo;
};

int main(int, char *[]) {

    /// mention vertex data in declaring adjacency list
    typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, VertexData>
        MyGraphType;

    MyGraphType g(9);
    add_edge(0, 1, g);
    add_edge(1, 2, g);
    add_edge(2, 3, g);
    add_edge(3, 4, g);
    add_edge(4, 5, g);
    add_edge(6, 6, g);
    add_edge(4, 1, g);
    add_edge(0, 3, g);
    add_edge(2, 6, g);
    add_edge(1, 6, g);
    add_edge(1, 5, g);

    std::srand(time(0));
    auto gen_topo = []() -> string_table {
        auto ranch = [] { return std::string(1, rand()%26 + 'a'); };
        return {
            { ranch(), ranch(), ranch() },
            { ranch(), ranch(), ranch() },
            { ranch(), ranch(), ranch() },
        };
    };

    for (auto v : boost::make_iterator_range(boost::vertices(g))) {
        auto& data = g[v];
        data.id = v;
        data.topo = gen_topo();
    }

    std::cout << "out-degree: " << boost::out_degree(8, g);

    {
        std::ofstream dotfile;
        dotfile.open("dotgraph.txt");

        boost::dynamic_properties dp;

        dp.property("node_id", get(&VertexData::id, g));

        auto topo_attr = [&g](MyGraphType::vertex_descriptor const& v) {
            auto& vd = g[v];
            std::string s;
            for (auto& row : vd.topo) {
                for (auto& el : row) s += el + " ";
                s += '\n';
            }
            return s;
        };

        dp.property("toponodedist", boost::make_transform_value_property_map(topo_attr, get(boost::vertex_index, g)));

        boost::write_graphviz_dp(dotfile, g, dp);
    }
}

点图看起来像:

graph G {
0 [toponodedist="q c i 
z a e 
o x c 
"];
1 [toponodedist="i u t 
c i l 
s k w 
"];
2 [toponodedist="z q m 
q j l 
n o t 
"];
3 [toponodedist="u k q 
g d u 
o c v 
"];
4 [toponodedist="u t s 
w d n 
r g x 
"];
5 [toponodedist="e y h 
b x z 
n q i 
"];
6 [toponodedist="a f y 
w z j 
m f o 
"];
7 [toponodedist="g v s 
d r l 
w o p 
"];
8 [toponodedist="l h x 
i m x 
s n v 
"];
0--1 ;
1--2 ;
2--3 ;
3--4 ;
4--5 ;
6--6 ;
4--1 ;
0--3 ;
2--6 ;
1--6 ;
1--5 ;
}

演示可视化

只需使用 label 属性而不是 toponodedest 使其显示在标准点渲染上: