Question

我使用python库生成以下GraphViz .dot文件。

http://pastebin.com/mL7ck9Zp

我现在想把它读到C ++的Boost :: Graph中，这样我就可以使用Boost :: Graph的库算法了。

但是，我需要做一些预处理。特别是，我想用字符串构造函数创建一个捆绑属性，并让read_graphviz（）将点文件中label字段中的字符串传递给字符串构造函数。

我该怎么做？

Answer 1

首先要意识到的是，Boost文档样本几乎总是引用/从实际样本中生成：libs/graph/example/read_graphviz.cpp

要意识到的第二件事是BGL非常通用。高度。它在Boost Property Maps的概念上实现了很多这种通用性。

最后，请注意从“自由格式”（至少是动态/无类型文本格式）解析为某种泛型MutableGraph模型正在推动极限。

这解释了如何阅读the docs for property_map下的文档的重要部分。

无论如何，因为the sample确实有点过时了，请允许我证明：

将解析器的实现包含在一个翻译单元中：
```
#include <libs/graph/src/read_graphviz_new.cpp>
```
这样BGL仍然是一个仅限标题的库。

这些天喜欢捆绑的属性：

struct Vertex {
    std::string name, label, shape;
};

struct Edge {
    std::string label;
    double weight; // perhaps you need this later as well, just an example
};

typedef property<graph_name_t, std::string> graph_p;
typedef adjacency_list<vecS, vecS, directedS, Vertex, Edge, graph_p> graph_t;

我们将填补label，shape，name的顶点和边缘。

动态属性贴图是魔术发生的地方：

dynamic_properties dp/*(ignore_other_properties)*/;

此类提供对(name, typeid(key_type))标识的各种基础property maps的类型删除访问。

这意味着您可以注册捆绑的属性，并将它们映射到graphviz属性名称：

int main() {
    // Construct an empty graph and prepare the dynamic_property_maps.
    graph_t graph(0);

    dynamic_properties dp(ignore_other_properties);
    dp.property("node_id", get(&Vertex::name,  graph));
    dp.property("label",   get(&Vertex::label, graph));
    dp.property("shape",   get(&Vertex::shape, graph));
    dp.property("label",   get(&Edge::label,   graph));

这就是它的全部内容。 （阅读通过magic of Bundled Properties找到的page for the adjacency_list template）。

虽然我们不需要它，但我们也将图形属性抛出混合（如文档示例中所示）：

    // Use ref_property_map to turn a graph property into a property map
    boost::ref_property_map<graph_t *, std::string> gname(get_property(graph, graph_name));
    dp.property("name",    gname);

现在剩下的就是阅读图表了。

好。好吧。让我们把它写回去，但是使用新的图形名称，然后：

std::ifstream dot("input.dot");

if (read_graphviz(dot, graph, dp/*, "node_id"*/)) {
    std::cout << "Graph name: '" << get_property(graph, graph_name) << "'\n";
    get_property(graph, graph_name) = "Let's give it a name";
    write_graphviz_dp(std::cout, graph, dp/*, "node_id"*/);
}

不要忘记链接到Boost Regex

完整演示

<强> Live On Coliru

#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/property_map/dynamic_property_map.hpp>
#include <libs/graph/src/read_graphviz_new.cpp>
#include <boost/graph/graph_utility.hpp>

using namespace boost;

struct Vertex {
    std::string name, label, shape;
};

struct Edge {
    std::string label;
    double weight; // perhaps you need this later as well, just an example
};

typedef property<graph_name_t, std::string> graph_p;
typedef adjacency_list<vecS, vecS, directedS, Vertex, Edge, graph_p> graph_t;

int main() {
    // Construct an empty graph and prepare the dynamic_property_maps.
    graph_t graph(0);

    dynamic_properties dp/*(ignore_other_properties)*/;
    dp.property("node_id", get(&Vertex::name,  graph));
    dp.property("label",   get(&Vertex::label, graph));
    dp.property("shape",   get(&Vertex::shape, graph));
    dp.property("label",   get(&Edge::label,   graph));

    // Use ref_property_map to turn a graph property into a property map
    boost::ref_property_map<graph_t *, std::string> gname(get_property(graph, graph_name));
    dp.property("name",    gname);

    std::ifstream dot("input.dot");

    if (read_graphviz(dot, graph, dp/*, "node_id"*/)) {
        std::cout << "Graph name: '" << get_property(graph, graph_name) << "'\n";
        get_property(graph, graph_name) = "Let's give it a name";
        write_graphviz_dp(std::cout, graph, dp/*, "node_id"*/);
    }
}

打印（注意之前的空名称和更新后的图形名称属性）：

Graph name: ''
digraph G {
name="Let's give it a name";
n0 [label="A9\n", shape=box];
n1 [label="- [0.48%,19.42%]", shape=ellipse];
n11 [label="+ [0%,0%]", shape=ellipse];
n12 [label="- [0%,0.75%]", shape=ellipse];
n13 [label="+ [0.03%,1.33%]", shape=ellipse];
n14 [label="- [0%,0.75%]", shape=ellipse];
n15 [label="+ [0%,0%]", shape=ellipse];
n16 [label="+ [0%,0%]", shape=ellipse];
n17 [label="A14\n", shape=box];
n18 [label="+ [0.03%,2.51%]", shape=ellipse];
n19 [label="A15\n", shape=box];
n2 [label="A15\n", shape=box];
n20 [label="A6\n", shape=box];
n21 [label="A2\n", shape=box];
n22 [label="- [0%,1.11%]", shape=ellipse];
n23 [label="+ [0%,1%]", shape=ellipse];
n25 [label="- [0%,2.18%]", shape=ellipse];
n26 [label="+ [0%,1.79%]", shape=ellipse];
n27 [label="- [0%,1%]", shape=ellipse];
n28 [label="- [0%,0%]", shape=ellipse];
n29 [label="- [0%,0%]", shape=ellipse];
n3 [label="A11\n", shape=box];
n30 [label="- [0%,0%]", shape=ellipse];
n31 [label="- [0%,0%]", shape=ellipse];
n32 [label="- [0%,1%]", shape=ellipse];
n33 [label="A13\n", shape=box];
n34 [label="+ [0%,1%]", shape=ellipse];
n35 [label="- [0%,0%]", shape=ellipse];
n36 [label="- [0.01%,1.21%]", shape=ellipse];
n38 [label="A12\n", shape=box];
n39 [label="- [0%,1%]", shape=ellipse];
n4 [label="A4\n", shape=box];
n40 [label="+ [0%,1.17%]", shape=ellipse];
n42 [label="- [0%,0%]", shape=ellipse];
n43 [label="A12\n", shape=box];
n44 [label="+ [0%,1.11%]", shape=ellipse];
n45 [label="- [0%,1%]", shape=ellipse];
n47 [label="- [0%,0%]", shape=ellipse];
n49 [label="+ [0%,1.17%]", shape=ellipse];
n5 [label="+ [0%,0%]", shape=ellipse];
n52 [label="+ [0%,0.75%]", shape=ellipse];
n54 [label="A13\n", shape=box];
n55 [label="A14\n", shape=box];
n56 [label="- [0.03%,2.5%]", shape=ellipse];
n57 [label="+ [0.01%,2.27%]", shape=ellipse];
n59 [label="- [0%,0%]", shape=ellipse];
n6 [label="A7\n", shape=box];
n60 [label="+ [0%,1%]", shape=ellipse];
n63 [label="A15\n", shape=box];
n64 [label="+ [0.05%,1.34%]", shape=ellipse];
n65 [label="A15\n", shape=box];
n66 [label="- [0%,1%]", shape=ellipse];
n67 [label="+ [0.02%,2.44%]", shape=ellipse];
n7 [label="A14\n", shape=box];
n71 [label="+ [0.21%,3.83%]", shape=ellipse];
n8 [label="+ [0%,1.57%]", shape=ellipse];
n9 [label="- [0.01%,1.22%]", shape=ellipse];
n0->n1  [label=f];
n0->n2  [label=t];
n17->n18  [label="<=110"];
n17->n19  [label=">110"];
n19->n20  [label="<=8"];
n19->n49  [label=">8"];
n2->n3  [label="<=228"];
n2->n71  [label=">228"];
n20->n21  [label=aa];
n20->n25  [label=c];
n20->n26  [label=cc];
n20->n27  [label=d];
n20->n28  [label=e];
n20->n29  [label=ff];
n20->n30  [label=i];
n20->n31  [label=j];
n20->n32  [label=k];
n20->n33  [label=m];
n20->n38  [label=q];
n20->n42  [label=r];
n20->n43  [label=w];
n20->n47  [label=x];
n21->n22  [label="<=41"];
n21->n23  [label=">41"];
n3->n4  [label="<=3"];
n3->n63  [label=">3"];
n33->n34  [label=g];
n33->n35  [label=p];
n33->n36  [label=s];
n38->n39  [label=f];
n38->n40  [label=t];
n4->n5  [label=l];
n4->n6  [label=u];
n4->n54  [label=y];
n43->n44  [label=f];
n43->n45  [label=t];
n54->n55  [label=g];
n54->n59  [label=p];
n54->n60  [label=s];
n55->n56  [label="<=204"];
n55->n57  [label=">204"];
n6->n7  [label=bb];
n6->n11  [label=dd];
n6->n12  [label=ff];
n6->n13  [label=h];
n6->n14  [label=j];
n6->n15  [label=n];
n6->n16  [label=o];
n6->n17  [label=v];
n6->n52  [label=z];
n63->n64  [label="<=4"];
n63->n65  [label=">4"];
n65->n66  [label="<=5"];
n65->n67  [label=">5"];
n7->n8  [label="<=164"];
n7->n9  [label=">164"];
}

在Boost :: Graph中读取read_graphviz（），传递给构造函数

1 个答案:

完整演示