我使用
python库生成以下GraphViz .dot文件.
我现在想把它读成C的Boost :: Graph,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.
我该怎么做呢？
解决方法
首先要意识到的是,Boost文档样本几乎总是引用/从实际样本生成：
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,观察从“自由形式”(至少动态/无类型文本形式)解析为某种通用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仍然是一个只有头的库.
>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;
我们将填充顶点和边的标签,形状,名称.
>动态属性映射是魔术发生的地方：
dynamic_properties dp/*(ignore_other_properties)*/;
此类提供对由(name,typeid(key_type))标识的各种底层property maps的类型擦除访问.
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,get(&Edge::label,graph));
That’s really all there is to it. (Read up on the 07006,found via the 07007).
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.让我们把它写回来,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,"node_id"*/);
}
>不要忘记链接到Boost Regex
完整的演示
#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,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",graph));
// Use ref_property_map to turn a graph property into a property map
boost::ref_property_map<graph_t *,gname);
std::ifstream dot("input.dot");
if (read_graphviz(dot,"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,"node_id"*/);
}
}
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%,shape=ellipse];
n15 [label="+ [0%,shape=ellipse];
n16 [label="+ [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%,shape=ellipse];
n28 [label="- [0%,shape=ellipse];
n29 [label="- [0%,shape=ellipse];
n3 [label="A11\n",shape=Box];
n30 [label="- [0%,shape=ellipse];
n31 [label="- [0%,shape=ellipse];
n32 [label="- [0%,shape=ellipse];
n33 [label="A13\n",shape=Box];
n34 [label="+ [0%,shape=ellipse];
n35 [label="- [0%,shape=ellipse];
n36 [label="- [0.01%,1.21%]",shape=ellipse];
n38 [label="A12\n",shape=Box];
n39 [label="- [0%,shape=ellipse];
n4 [label="A4\n",shape=Box];
n40 [label="+ [0%,1.17%]",shape=ellipse];
n42 [label="- [0%,shape=ellipse];
n43 [label="A12\n",shape=Box];
n44 [label="+ [0%,shape=ellipse];
n45 [label="- [0%,shape=ellipse];
n47 [label="- [0%,shape=ellipse];
n49 [label="+ [0%,shape=ellipse];
n5 [label="+ [0%,shape=ellipse];
n52 [label="+ [0%,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%,shape=ellipse];
n6 [label="A7\n",shape=Box];
n60 [label="+ [0%,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%,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"];
}
